CN118027638B - Power battery heat dissipation material and preparation method thereof - Google Patents
Power battery heat dissipation material and preparation method thereof Download PDFInfo
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- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical class O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 claims abstract description 94
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 54
- 229920005989 resin Polymers 0.000 claims abstract description 36
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- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 23
- 235000019447 hydroxyethyl cellulose Nutrition 0.000 claims abstract description 23
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000000203 mixture Substances 0.000 claims abstract description 14
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 14
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000002202 Polyethylene glycol Substances 0.000 claims abstract description 11
- 229920001223 polyethylene glycol Polymers 0.000 claims abstract description 11
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000002994 raw material Substances 0.000 claims abstract description 9
- 239000008367 deionised water Substances 0.000 claims abstract description 8
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- 238000000034 method Methods 0.000 claims abstract description 7
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- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims abstract description 6
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- 229910052901 montmorillonite Inorganic materials 0.000 claims description 45
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 40
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- 239000000843 powder Substances 0.000 claims description 24
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- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 claims description 22
- 239000005543 nano-size silicon particle Substances 0.000 claims description 16
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- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 12
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 12
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- VZSRBBMJRBPUNF-UHFFFAOYSA-N 2-(2,3-dihydro-1H-inden-2-ylamino)-N-[3-oxo-3-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)propyl]pyrimidine-5-carboxamide Chemical compound C1C(CC2=CC=CC=C12)NC1=NC=C(C=N1)C(=O)NCCC(N1CC2=C(CC1)NN=N2)=O VZSRBBMJRBPUNF-UHFFFAOYSA-N 0.000 description 16
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- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 3
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- 230000002195 synergetic effect Effects 0.000 description 2
- PYSRRFNXTXNWCD-UHFFFAOYSA-N 3-(2-phenylethenyl)furan-2,5-dione Chemical group O=C1OC(=O)C(C=CC=2C=CC=CC=2)=C1 PYSRRFNXTXNWCD-UHFFFAOYSA-N 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
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- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- LAQFLZHBVPULPL-UHFFFAOYSA-N methyl(phenyl)silicon Chemical compound C[Si]C1=CC=CC=C1 LAQFLZHBVPULPL-UHFFFAOYSA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229940068918 polyethylene glycol 400 Drugs 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 229920002050 silicone resin Polymers 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L69/00—Compositions of polycarbonates; Compositions of derivatives of polycarbonates
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/20—Applications use in electrical or conductive gadgets
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Abstract
The application belongs to the technical field of heat dissipation materials, and particularly discloses a power battery heat dissipation material and a preparation method thereof. A power battery heat dissipation material comprises the following raw materials: 1-2 parts of modified graphene, 6-12 parts of organic silicon resin, 15-25 parts of polycarbonate, 1-3 parts of polyethylene glycol and 1-3 parts of compatilizer; the preparation method of the modified graphene comprises the following steps: dispersing graphene in ammonia water with the mass concentration of 6-8%, soaking, washing with water, dispersing in absolute ethyl alcohol again, adding modified montmorillonite, carrying out ultrasonic treatment, filtering, drying, dispersing in deionized water again, adding nano nickel, stirring at the temperature of 80-85 ℃, and filtering to obtain a mixture; spraying the hydroxyethyl cellulose water solution on the surface of the mixture, and drying to obtain the modified graphene. The modified graphene prepared by the method has good dispersibility, is subsequently applied to heat dissipation materials, and improves the mechanical property and the heat conductivity of the heat dissipation materials.
Description
Technical Field
The application relates to the technical field of heat dissipation materials, in particular to a power battery heat dissipation material and a preparation method thereof.
Background
The power battery is a power source for providing power source for tools, the tools generally comprise electric automobiles, electric trains, electric bicycles and the like, and the power battery is a core component of new energy automobiles and is also an important direction of energy transformation in the future. At present, most electric vehicles adopt a lithium battery as a main raw material of a power battery, the working current and the heat generation amount of the lithium battery are large, the lithium battery is in a relatively closed environment during working, the temperature of the battery and the surrounding environment are easy to rise, the heat is too high, the battery can generate potential safety hazards, in order to avoid the problems, a radiating fin is arranged in the battery to radiate heat in time, the working temperature of the environment where the battery is located is reduced, and the safety and the working stability of the battery are further guaranteed.
Graphene is used as a novel carbon material and has extremely high heat conductivity and heat radiation coefficient, can be well applied to a heat radiation material system, and is generally compounded with other materials to form a heat radiation fin with a multi-layer structure, so that various effects such as heat radiation, flame retardance and mechanical property are achieved, but graphene is easy to agglomerate in the preparation process of the heat radiation material, so that the dispersibility of the graphene in the heat radiation material is influenced, and the heat conduction power of the heat radiation material is further influenced.
Disclosure of Invention
In order to solve the problem that graphene is easy to agglomerate in the preparation process of a heat dissipation material, the application provides a power battery heat dissipation material and a preparation method thereof.
The application provides a power battery heat dissipation material, which adopts the following technical scheme:
The power battery heat dissipation material comprises the following raw materials in parts by weight: 1-2 parts of modified graphene, 6-12 parts of organic silicon resin, 15-25 parts of polycarbonate, 1-3 parts of polyethylene glycol and 1-3 parts of compatilizer;
The preparation method of the modified graphene comprises the following steps: dispersing graphene in ammonia water with the mass concentration of 6-8% for 15-20min, washing, dispersing in absolute ethyl alcohol, adding modified montmorillonite, carrying out ultrasonic treatment for 30-50min, filtering, drying, dispersing in deionized water, adding nano nickel, stirring at 80-85 ℃ for 1-2h, and filtering to obtain a mixture;
and dissolving hydroxyethyl cellulose in deionized water to obtain an aqueous solution of hydroxyethyl cellulose, spraying the aqueous solution of hydroxyethyl cellulose on the surface of the mixture, and drying to obtain the modified graphene.
By adopting the technical scheme, the graphene has higher heat conductivity, high conductivity and better elasticity, has better heat dissipation performance as a heat dissipation material, conducts heat in the power battery, and avoids danger caused by overheating in the power battery; the organic silicon resin has excellent thermal oxidation stability, weather resistance, ageing resistance, ultraviolet light resistance, stain resistance and other excellent performances, can improve the corresponding performances of a system, has good film forming property, is hydrolysis resistant, high and low temperature resistant, and has excellent tensile strength and flexibility, and the prepared heat dissipation material has good film forming property after the raw material components are mixed.
The polycarbonate has good mechanical property, insulating property, flame retardance and heat resistance, and is mixed with the graphene, so that the mechanical property and flame retardance of a system are further improved, and the polyethylene glycol has good dispersibility and compatibility, so that the components are uniformly mixed, and the graphene, the organic silicon resin, the polycarbonate and the polyethylene glycol are mixed, so that the heat dissipation property and the mechanical property of the heat dissipation material are improved.
In the preparation method of the modified graphene, graphene is mixed with ammonia water, hydroxyl ions in the ammonia water can chemically react with carbon atoms on the surface of the graphene, and ammonium ions and hydroxyl ions chemically react with the carbon atoms on the surface of the graphene, so that the surface of the graphene is degraded, the roughness of the surface of the graphene is increased, and the loading of subsequent components is facilitated.
The modified montmorillonite has nanoscale pores, high specific surface area, strong adsorption capacity and good dispersion performance, the modified montmorillonite is mixed with graphene, and hydrogen bonds are formed between carboxyl groups on the graphene and hydroxyl groups in the modified montmorillonite, so that agglomeration of the graphene can be effectively prevented, and the strength, ageing resistance, impact resistance, fatigue resistance, chemical stability and the like of a system are improved.
The nano nickel has excellent magnetic property, chemical stability, mechanical strength and heat conduction performance, can increase the mechanical property of the system, and simultaneously improves the heat conduction performance of the system; the graphene has very good heat conduction performance, the graphene and the modified montmorillonite are mixed to improve the heat conduction of the montmorillonite, and the nano nickel is further mixed to obviously increase the heat conduction performance of the modified montmorillonite, so that the heat dissipation performance of the whole system is improved.
The hydroxyethyl cellulose is dissolved in deionized water, has certain cohesiveness and film forming property, can enable nano nickel to be adhered to the surfaces of graphene and modified montmorillonite, further increases the cohesiveness among the graphene, the nano nickel and the modified montmorillonite, ensures stable system structure, further ensures the stability of mechanical property and heat dissipation property, and is beneficial to the permanence of action effect.
Preferably, the mass ratio of the graphene to the modified montmorillonite to the nano nickel to the hydroxyethyl cellulose is 1mg to 0.03-0.06g to 0.01-0.02g to 0.007-0.009g.
By adopting the technical scheme, the mass ratio of graphene, modified montmorillonite, nano nickel and hydroxyethyl cellulose is further limited within a certain range, so that modified graphene with better mechanical property and better heat dissipation performance is obtained, hydrogen bonds are formed between carboxyl groups on the graphene and hydroxyl groups in the modified montmorillonite, agglomeration of the graphene can be effectively prevented, nano nickel is adhered to the surfaces of the graphene and the modified montmorillonite through the hydroxyethyl cellulose, the adhesiveness between the graphene, the modified montmorillonite and the nano nickel is improved, the graphene, the modified montmorillonite and the nano nickel have better mechanical property, the graphene and the nano nickel have better heat conductivity, the mechanical strength and the heat dissipation performance of a system are further improved, the structural stability of the system is further improved, and the stability of the action effect of the system is guaranteed.
Preferably, the preparation method of the modified montmorillonite comprises the following steps:
(1) Dispersing montmorillonite in citric acid, soaking for 1-2 hr, filtering, washing with water, drying, and treating at 200-210 deg.C for 2-3 hr to obtain pretreated montmorillonite;
(2) Dispersing the pretreated montmorillonite in the step (1) in absolute ethyl alcohol, adding nano silicon dioxide, stirring for 1-2h at 60-65 ℃, then adding modified carbon fiber, continuously stirring for 2-3h, filtering and drying to obtain the modified montmorillonite.
By adopting the technical scheme, citric acid degrades the surface of the montmorillonite to a certain extent, so that the surface of the montmorillonite becomes rough, the specific surface area of the montmorillonite is increased, and the follow-up loading of other components is facilitated; and then the montmorillonite is further heated to remove organic impurities in the montmorillonite, so that the specific surface area of the montmorillonite is increased, and the montmorillonite is easier to mix with other subsequent components.
The nano silicon dioxide has the advantages of small particle size, large specific surface area, strong surface adsorption capacity, good dispersion performance and the like, is uniformly loaded on the surface of the montmorillonite in a chemical bond connection mode, and can obviously improve the mechanical strength, wear resistance and ageing resistance of the montmorillonite; the modified carbon fiber has the characteristics of high strength, high modulus, high temperature resistance, excellent electrical performance, small volume, small mass and the like, the modified carbon fiber can be loaded on the surface of the montmorillonite in a hydrogen bond connection mode, and the nano silicon dioxide can be loaded on the surface of the modified carbon fiber in a chemical bond connection mode, so that the nano silicon dioxide, the modified carbon fiber and the montmorillonite are crosslinked to form a network structure, and the mechanical property of the montmorillonite is improved.
In addition, as the crystal structure of the modified carbon fiber is compact and ordered, the intermolecular distance is short, and the energy transfer is rapid, the modified carbon fiber has good heat conduction performance, and the heat conduction performance of the montmorillonite is improved by the network structure formed among the nano silicon dioxide, the modified carbon fiber and the montmorillonite, so that the heat conduction performance of the montmorillonite is improved.
Preferably, the mass ratio of montmorillonite, nano silicon dioxide and modified carbon fiber is 1:0.6-0.9:0.1-0.3.
By adopting the technical scheme, the mass ratio of montmorillonite, nano silicon dioxide and carbon fiber is further limited within a certain range, so that the modified montmorillonite with better mechanical property and better heat dissipation is obtained, the nano silicon dioxide is loaded on the surface of the montmorillonite in a chemical bond connection mode, the modified carbon fiber is loaded on the surface of the montmorillonite in a hydrogen bond connection mode, meanwhile, the nano silicon dioxide can be loaded on the surface of the modified carbon fiber in a chemical bond connection mode, a network structure is formed among the montmorillonite, the nano silicon dioxide and the carbon fiber, and the mechanical property and the heat dissipation performance of the montmorillonite are further improved.
Preferably, the preparation method of the modified carbon fiber comprises the following steps: dispersing carbon fiber in acetic acid solution, adding ceramic powder, stirring at 85-90deg.C for 1-2 hr, and filtering to obtain a mixture;
and (3) dissolving rosin resin in absolute ethyl alcohol to obtain a rosin resin solution, spraying the rosin resin solution on the surface of the mixture, and drying to obtain the modified carbon fiber.
By adopting the technical scheme, the carbon fiber is a material with high strength, high modulus and excellent mechanical property, and the acetic acid can treat the surface of the carbon fiber, so that the surface of the carbon fiber becomes rough, and the bonding strength of the subsequent carbon fiber and other components is improved.
The ceramic powder has good heat dissipation, the ceramic powder is mixed with the carbon fiber, and the rosin resin can increase the connectivity between the ceramic powder and the carbon fiber, so that the ceramic powder is stably bonded on the surface of the carbon fiber, further the heat dissipation of the carbon fiber is improved, and the modified montmorillonite is beneficial to improving the mechanical property and heat dissipation of the montmorillonite in the subsequent preparation process of the modified montmorillonite.
Preferably, the mass ratio of the carbon fiber to the ceramic powder to the rosin resin is 1:0.3-0.6:0.07-0.09.
By adopting the technical scheme, the mass ratio of the carbon fiber, the ceramic powder and the rosin resin is further limited within a certain range, so that the carbon fiber with better mechanical property and better heat dissipation property is obtained, the rosin resin increases the viscosity between the ceramic powder and the carbon fiber, so that the ceramic powder is stably adhered to the surface of the carbon fiber, the heat dissipation property of the carbon fiber is further improved, and meanwhile, the carbon fiber has higher heat conductivity, so that the carbon fiber has better heat dissipation property.
In a second aspect, the application also provides a preparation method of the heat dissipation material of the power battery, which comprises the following steps: and mixing the modified graphene, the organic silicon resin, the polycarbonate, the compatilizer and the polyethylene glycol, uniformly stirring, carrying out melt extrusion, and carrying out casting cooling to form a film to obtain the power battery heat dissipation material.
By adopting the technical scheme, the operation steps are adopted, the operation is simple, the operation of the process flow is easy, and the subsequent industrial production is convenient.
Preferably, the temperature of the melt extrusion is 220-230 ℃.
By adopting the technical scheme, the melt extrusion temperature is set, so that the components are uniformly mixed, and the high-solubility melt extrusion coating has high intersolubility.
Preferably, in the casting cooling film forming, the cooling temperature is 5-10 ℃.
By adopting the technical scheme, the cooling temperature is set, so that the prepared power battery heat dissipation material has good film forming property.
In summary, the application has the following beneficial effects:
1. According to the application, the modified montmorillonite is mixed with the graphene, sodium ions in the modified montmorillonite play a role in connecting the modified montmorillonite and the graphene, and hydrogen bonds are formed between carboxyl groups on the graphene and hydroxyl groups in the modified montmorillonite, so that the aggregation of the graphene can be effectively prevented, and the prepared heat dissipation material has higher thermal conductivity and mechanical property.
2. The modified graphene has higher heat conductivity, high conductivity and better elasticity, has better heat dissipation performance as a heat dissipation material, conducts heat in the power battery, and avoids danger caused by overheating in the power battery; the organic silicon resin has excellent thermal oxidation stability, weather resistance, ageing resistance, ultraviolet light resistance, stain resistance and other excellent performances, can improve the corresponding performances of a system, has good film forming property, is hydrolysis resistant, high and low temperature resistant, and has excellent tensile strength and flexibility, and the prepared heat dissipation material has good film forming property after the raw material components are mixed.
3. The polycarbonate has good mechanical property, insulating property, flame retardance and heat resistance, and is mixed with graphene, so that the mechanical property and flame retardance of a system are further improved, and the polyethylene glycol has good dispersibility and compatibility, so that the components are uniformly mixed, and the graphene, the organic silicon resin, the polycarbonate and the polyethylene glycol are mixed, so that the heat dissipation property and the mechanical property of the heat dissipation material are improved.
Detailed Description
The present application will be described in further detail with reference to examples.
The raw materials used in examples and comparative examples are all commercially available.
Preparation example of modified graphene
PREPARATION EXAMPLE 1-1
The preparation method of the modified graphene comprises the following steps: dispersing 1g of graphene in 4L of 7% ammonia water for 20min, washing, dispersing in 50L of absolute ethyl alcohol, adding modified montmorillonite, carrying out ultrasonic treatment for 50min, filtering, drying, dispersing in 80L of deionized water, adding nano nickel, stirring at 85 ℃ for 2h, and filtering to obtain a mixture;
Dissolving hydroxyethyl cellulose in 16L deionized water to obtain an aqueous solution of hydroxyethyl cellulose, spraying the aqueous solution of hydroxyethyl cellulose on the surface of the mixture, and drying to obtain modified graphene; wherein the mass ratio of the graphene to the modified montmorillonite to the nano nickel to the hydroxyethyl cellulose is 1mg to 0.03g to 0.02g to 0.009g.
The preparation method of the modified montmorillonite comprises the following steps:
(1) Dispersing 35kg of montmorillonite in 50L of 15% citric acid, soaking for 2h, filtering, washing with water, drying, and treating at 200deg.C for 2h to obtain pretreated montmorillonite;
(2) Dispersing the pretreated montmorillonite in the step (1) in 92L absolute ethyl alcohol, adding nano silicon dioxide, stirring for 2 hours at the temperature of 65 ℃, then adding modified carbon fiber, continuously stirring for 3 hours, filtering and drying to obtain modified montmorillonite, wherein the mass ratio of montmorillonite, nano silicon dioxide and modified carbon fiber is 1:0.6:0.3.
The preparation method of the modified carbon fiber comprises the following steps: dispersing 6kg of carbon fiber in 10L of acetic acid solution with the mass concentration of 10%, adding ceramic powder, stirring for 2 hours at the temperature of 90 ℃, and filtering to obtain a mixture;
And dissolving rosin resin in 3L absolute ethyl alcohol to obtain a rosin resin solution, spraying the rosin resin solution on the surface of the mixture, and drying to obtain the modified carbon fiber, wherein the mass ratio of the carbon fiber to the ceramic powder to the rosin resin is 1:0.3:0.07.
PREPARATION EXAMPLES 1-2
The difference from preparation example 1-1 is that modified montmorillonite was not added during the process of modifying graphene.
Preparation examples 1 to 3
The difference from preparation example 1-1 is that nano nickel is not added in the process of modifying graphene.
Preparation examples 1 to 4
The difference from preparation example 1-1 is that hydroxyethyl cellulose is not added during the modification of graphene.
Preparation examples 1 to 5
The difference from preparation example 1-1 is that the mass ratio of graphene, modified montmorillonite, nano nickel and hydroxyethyl cellulose is 1 mg/0.06 g/0.01 g/0.0070 g.
Preparation examples 1 to 6
The difference from preparation example 1-1 is that the mass ratio of graphene, modified montmorillonite, nano nickel and hydroxyethyl cellulose is 1 mg/0.09 g/0.1 g/0.01 g.
Preparation examples 1 to 7
The difference from preparation example 1-1 is that step (1) is not performed in the preparation method of the modified montmorillonite.
Preparation examples 1 to 8
The difference from preparation example 1-1 is that nano silica is not added in the preparation method of the modified montmorillonite.
Preparation examples 1 to 9
The difference from preparation example 1-1 is that modified carbon fiber is not added in the preparation method of the modified montmorillonite.
Preparation examples 1 to 10
The difference from preparation example 1-1 is that the mass ratio of montmorillonite, nano silica and modified carbon fiber is 1:0.9:0.1.
Preparation examples 1 to 11
The difference from preparation example 1-1 is that the mass ratio of montmorillonite, nano silica and modified carbon fiber is 1:0.3:0.7.
Preparation examples 1 to 12
The difference from preparation example 1-1 is that ceramic powder was not added in the preparation method of the modified carbon fiber.
Preparation examples 1 to 13
The difference from preparation example 1-1 is that rosin resin was not added in the preparation method of the modified carbon fiber.
Preparation examples 1 to 14
The difference from preparation example 1-1 is that the mass ratio of carbon fiber, ceramic powder and rosin resin is 1:0.6:0.09.
Preparation examples 1 to 15
The difference from preparation example 1-1 is that the mass ratio of carbon fiber, ceramic powder and rosin resin is 1:0.1:0.2.
Examples
Example 1
A power battery heat dissipation material comprises the following raw materials by weight: 1kg of graphene, 6kg of organic silicon resin, 20kg of polycarbonate, 400 kg of polyethylene glycol and 1kg of compatilizer, wherein the organic silicon resin is methyl phenyl silicone resin, and the compatilizer is styrene-maleic anhydride copolymer (SMA).
The preparation method of the power battery heat dissipation material comprises the following steps: mixing the modified graphene, the organic silicon resin, the polycarbonate, the polyethylene glycol 400 and the compatilizer, uniformly stirring, melting and extruding, and casting, cooling and film forming to obtain the power battery heat dissipation material.
Wherein the temperature of the melt extrusion was 230 ℃.
Wherein, in the casting cooling film forming, the cooling temperature is 10 ℃.
Wherein, the thickness of the film prepared by the heat dissipation material of the power battery is 12 mu m.
The modified graphene was prepared using preparation example 1-1.
Example 2
The power battery heat dissipation material is different from the embodiment 1 in that 2kg of graphene, 12kg of organic silicon resin, 25kg of polycarbonate, 400 kg of polyethylene glycol and 3kg of compatilizer.
Example 3
The power battery heat dissipation material is different from the embodiment in that the modified graphene is prepared by adopting preparation examples 1-5.
Example 4
A power battery heat dissipation material differs from example 1 in that modified graphene was prepared using preparation examples 1-6.
Example 5
A power battery heat dissipation material differs from example 1 in that modified graphene was prepared using preparation examples 1-7.
Example 6
A power battery heat dissipation material differs from example 1 in that modified graphene was prepared using preparation examples 1-8.
Example 7
A power battery heat dissipation material differs from example 1 in that modified graphene was prepared using preparation examples 1-9.
Example 8
A power battery heat dissipation material differs from example 1 in that modified graphene was prepared using preparation examples 1-10.
Example 9
A power battery heat dissipation material differs from example 1 in that modified graphene was prepared using preparation examples 1-11.
Example 10
A power battery heat dissipation material differs from example 1 in that modified graphene was prepared using preparation examples 1-12.
Example 11
A power battery heat dissipation material differs from example 1 in that modified graphene was prepared using preparation examples 1-13.
Example 12
A power battery heat dissipation material differs from example 1 in that modified graphene was prepared using preparation examples 1-14.
Example 13
A power battery heat dissipation material differs from example 1 in that modified graphene was prepared using preparation examples 1-15.
Comparative example
Comparative example 1
A power battery heat sink material differs from example 1 in that the modified graphene is replaced by an equal amount of graphene.
Example 2
A power battery heat dissipation material differs from example 1 in that modified graphene was prepared using preparation examples 1-2.
Example 3
A power battery heat dissipation material differs from example 1 in that modified graphene was prepared using preparation examples 1-3.
Example 4
The power battery heat dissipation material is different from the embodiment in that the modified graphene is prepared by adopting preparation examples 1-4.
Performance test
The mechanical properties and the heat dissipation performance of the power battery heat dissipation materials prepared in examples 1-13 and comparative examples 1-4 are tested;
and (3) testing heat conduction performance: the measurement is carried out by a DR-600 heat flow meter heat conductivity coefficient measuring instrument (the brand is DR600, the model is DR-600) and the measurement is carried out according to the national standard GBT 10295-2008.
Detection of tensile Strength: the measurement is carried out according to the national standard GB/T1040-1992.
And (3) impact resistance detection: the measurement was carried out according to the national standard GB/T8809-1988, and the results are shown in Table 1.
Table 1 test data for examples and comparative examples
As can be seen from Table 1, the heat dissipation materials for power batteries prepared in examples 1-3, 8 and 12 of the present application have good thermal conductivity, tensile strength and impact strength, wherein the thermal diffusivity of example 1 is 1280mm 2/s, the thermal conductivity is 1820W/(m.K), the tensile strength is 60MPa, and the impact strength is 55kJ/m 2. The modified graphene has higher thermal conductivity and mechanical property, the polycarbonate has good mechanical property and insulating property, the organic silicon resin has excellent tensile strength and flexibility, and all the raw materials are matched with each other to jointly improve the heat dissipation property and mechanical property of the heat dissipation material of the power battery.
Example 4 the mass ratio of graphene, modified montmorillonite, nano nickel and hydroxyethyl cellulose was changed, and it is seen from table 1 that the test data is better than comparative examples 2-4 and worse than examples 1-3 compared to example 1, indicating that there is a synergistic effect between graphene, modified montmorillonite, nano nickel and hydroxyethyl cellulose, and the overall performance of graphene is improved together.
In the preparation method of the modified montmorillonite of example 5, step (1) is not performed, and as compared with example 1, it is seen from Table 1 that the heat dissipation material has a thermal diffusivity of 1220mm 2/s, a heat conductivity of 1790W/(m.K), a tensile strength of 55MPa and an impact strength of 50kJ/m 2. The pretreatment of montmorillonite is shown to increase the specific surface area of montmorillonite and facilitate the subsequent loading of other components.
In the preparation method of the modified montmorillonite of example 6, no nano silicon dioxide is added, and compared with example 1, the heat dissipation material has a thermal diffusion coefficient of 1180mm 2/s, a heat conduction coefficient of 1700W/(m.K), a tensile strength of 48MPa and an impact strength of 43kJ/m 2. The nano silicon dioxide is uniformly loaded on the surface of the montmorillonite, so that the mechanical strength, the wear resistance and the ageing resistance of the montmorillonite can be obviously improved.
In the preparation method of the modified montmorillonite in example 7, modified carbon fiber is not added, and compared with example 1, the heat dissipation material has a thermal diffusion coefficient of 1140mm 2/s, a heat conduction coefficient of 1680W/(m.K), a tensile strength of 46MPa and an impact strength of 41J/m 2 as seen from Table 1. The modified carbon fiber can be loaded on the surface of montmorillonite, so that the mechanical property and the thermal conductivity of montmorillonite are improved.
Example 9 improves the mass ratio of montmorillonite, nano-silica and modified carbon fiber, and from table 1, the test data is better than examples 6-7, and worse than examples 1 and 8, compared with example 1, indicating that there is a synergistic effect between montmorillonite, nano-silica and modified carbon fiber, and the combination property of montmorillonite is improved.
As can be seen from table 1, the heat dissipation material of example 10, which was prepared without adding ceramic powder, had a thermal diffusivity of 1190mm 2/s, a thermal conductivity of 1720W/(m·k), a tensile strength of 50MPa, and an impact strength of 45kJ/m 2, compared with example 1. The ceramic powder has better heat dissipation, and the mechanical property and heat dissipation performance of the carbon fiber are improved by mixing the ceramic powder with the carbon fiber.
In the method for producing the modified carbon fiber of example 11, no rosin resin was added, and it is apparent from Table 1 that the heat dissipation material had a thermal diffusivity of 1210mm 2/s, a thermal conductivity of 1740W/(m.K), a tensile strength of 52MPa, and an impact strength of 47kJ/m 2, as compared with example 1. The rosin resin can increase the connectivity between the ceramic powder and the carbon fiber, so that the ceramic powder is stably adhered to the surface of the carbon fiber, and the heat dissipation of the carbon fiber is further improved.
Example 13 improves the mass ratio of carbon fiber, ceramic powder and rosin resin, and it is seen from table 1 that the test data is superior to examples 10 to 11, and worse than examples 1 and 12, compared with example 1, showing that the rosin resin increases the tackiness between the ceramic powder and the carbon fiber, so that the ceramic powder stably adheres to the surface of the carbon fiber, and the combination properties of the carbon fiber are improved together.
Comparative example 1 the modified graphene was replaced with an equal amount of graphene, and it is seen from Table 1 that the heat dissipation material had a thermal diffusivity of 930mm 2/s, a thermal conductivity of 1500W/(m.K), a tensile strength of 37MPa, and an impact strength of 320kJ/m 2, as compared with example 1. The modified graphene has good dispersion performance and mechanical property, and is subsequently applied to a heat-dissipating material, so that the corresponding performance of the heat-dissipating material is improved.
Comparative example 2 modified graphene was prepared without adding modified montmorillonite, and it is apparent from table 1 that the heat dissipation material has a thermal diffusivity of 952mm 2/s, a thermal conductivity of 1523W/(m·k), a tensile strength of 40MPa, and an impact strength of 35kJ/m 2, compared with example 1. The modified montmorillonite has good mechanical property and heat dispersibility, so that the corresponding performance of graphene is improved, and the modified montmorillonite is subsequently applied to heat dissipation materials to improve the corresponding performance of the heat dissipation materials.
Compared with the example 1, the heat dissipation material has a thermal diffusion coefficient of 1020mm 2/s, a heat conduction coefficient of 1610W/(m.K), a tensile strength of 43MPa and an impact strength of 38kJ/m 2, as shown in Table 1. The nano nickel is loaded on the surfaces of the graphene and the modified montmorillonite, so that the mechanical property of the system is improved, and the heat conductivity of the system is improved.
Comparative example 4 modified graphene was prepared without adding hydroxyethyl cellulose, and it is apparent from table 1 that the heat dissipation material has a thermal diffusivity of 1080mm 2/s, a thermal conductivity of 1660W/(m·k), a tensile strength of 44MPa, and an impact strength of 39kJ/m 2, compared with example 1. The hydroxyethyl cellulose can coat the modified montmorillonite, so that the cohesiveness among the graphene, the nano nickel and the modified montmorillonite is further improved, and the corresponding performance of the system is further improved.
The present embodiment is only for explanation of the present application and is not to be construed as limiting the present application, and modifications to the present embodiment, which may not creatively contribute to the present application as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present application.
Claims (7)
1. The power battery heat dissipation material is characterized by comprising the following raw materials in parts by weight: 1-2 parts of modified graphene, 6-12 parts of organic silicon resin, 15-25 parts of polycarbonate, 1-3 parts of polyethylene glycol and 1-3 parts of compatilizer;
The preparation method of the modified graphene comprises the following steps: dispersing graphene in ammonia water with the mass concentration of 6-8% for 15-20min, washing, dispersing in absolute ethyl alcohol, adding modified montmorillonite, carrying out ultrasonic treatment for 30-50min, filtering, drying, dispersing in deionized water, adding nano nickel, stirring at 80-85 ℃ for 1-2h, and filtering to obtain a mixture;
Dissolving hydroxyethyl cellulose in deionized water to obtain an aqueous solution of hydroxyethyl cellulose, spraying the aqueous solution of hydroxyethyl cellulose on the surface of the mixture, and drying to obtain modified graphene;
The preparation method of the modified montmorillonite comprises the following steps:
(1) Dispersing montmorillonite in citric acid, soaking for 1-2 hr, filtering, washing with water, drying, treating at 200-210 deg.C for 2-3 hr, and grinding to obtain pretreated montmorillonite;
(2) Dispersing the pretreated montmorillonite in the step (1) in absolute ethyl alcohol, adding nano silicon dioxide, stirring for 1-2 hours at the temperature of 60-65 ℃, then adding modified carbon fiber, continuously stirring for 2-3 hours, filtering and drying to obtain modified montmorillonite;
The preparation method of the modified carbon fiber comprises the following steps: dispersing carbon fiber in acetic acid solution, adding ceramic powder, stirring at 85-90deg.C for 1-2 hr, and filtering to obtain a mixture;
and (3) dissolving rosin resin in absolute ethyl alcohol to obtain a rosin resin solution, spraying the rosin resin solution on the surface of the mixture, and drying to obtain the modified carbon fiber.
2. The power battery heat dissipation material according to claim 1, wherein the mass ratio of the graphene, the modified montmorillonite, the nano nickel and the hydroxyethyl cellulose is 1mg:0.03-0.06g:0.01-0.02g:0.007-0.009g.
3. The heat dissipation material for power cells according to claim 1, wherein the mass ratio of montmorillonite, nano silicon dioxide and modified carbon fiber is 1:0.6-0.9:0.1-0.3.
4. The heat dissipation material for power cells according to claim 1, wherein the mass ratio of the carbon fiber, the ceramic powder and the rosin resin is 1:0.3-0.6:0.07-0.09.
5. The method for preparing the heat dissipation material for the power battery according to claim 1, comprising the steps of: and mixing the modified graphene, the organic silicon resin, the polycarbonate, the compatilizer and the polyethylene glycol, uniformly stirring, carrying out melt extrusion, and carrying out casting cooling to form a film to obtain the power battery heat dissipation material.
6. The method for preparing a heat sink material for a power battery according to claim 5, wherein the temperature of the melt extrusion is 220-230 ℃.
7. The method for preparing a heat sink material for a power battery according to claim 5, wherein the temperature of cooling in the cast cooling film is 5-10 ℃.
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| CN104497535B (en) * | 2014-12-26 | 2016-08-31 | 深圳华力兴新材料股份有限公司 | A kind of LDS polycarbonate compositions with good thermal stability |
| CN113717702B (en) * | 2021-08-31 | 2023-09-29 | 中钢天源股份有限公司 | Graphene composite heat sink and preparation method thereof |
| CN114292507B (en) * | 2021-09-27 | 2024-01-05 | 西南科技大学 | Organic montmorillonite modified flame-retardant PC material and preparation method thereof |
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