CN108807932B - Cathode material for graphene battery and preparation method thereof - Google Patents
Cathode material for graphene battery and preparation method thereof Download PDFInfo
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- CN108807932B CN108807932B CN201810669859.XA CN201810669859A CN108807932B CN 108807932 B CN108807932 B CN 108807932B CN 201810669859 A CN201810669859 A CN 201810669859A CN 108807932 B CN108807932 B CN 108807932B
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 142
- 229910021389 graphene Inorganic materials 0.000 title claims abstract description 91
- 239000010406 cathode material Substances 0.000 title claims abstract description 57
- 238000002360 preparation method Methods 0.000 title claims abstract description 21
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims abstract description 60
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 41
- 239000010439 graphite Substances 0.000 claims abstract description 41
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims abstract description 38
- 229910052721 tungsten Inorganic materials 0.000 claims abstract description 38
- 239000010937 tungsten Substances 0.000 claims abstract description 38
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 30
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims abstract description 30
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 30
- 229910052744 lithium Inorganic materials 0.000 claims abstract description 30
- 229910052750 molybdenum Inorganic materials 0.000 claims abstract description 30
- 239000011733 molybdenum Substances 0.000 claims abstract description 30
- 229910052697 platinum Inorganic materials 0.000 claims abstract description 30
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 30
- 239000010936 titanium Substances 0.000 claims abstract description 30
- 239000000463 material Substances 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 15
- 239000000203 mixture Substances 0.000 claims abstract description 14
- 239000002994 raw material Substances 0.000 claims abstract description 13
- 239000000758 substrate Substances 0.000 claims description 28
- 239000006229 carbon black Substances 0.000 claims description 24
- 239000004642 Polyimide Substances 0.000 claims description 23
- 239000000853 adhesive Substances 0.000 claims description 23
- 230000001070 adhesive effect Effects 0.000 claims description 23
- 229920001721 polyimide Polymers 0.000 claims description 23
- 238000001035 drying Methods 0.000 claims description 22
- 239000011248 coating agent Substances 0.000 claims description 20
- 238000000576 coating method Methods 0.000 claims description 20
- 239000003638 chemical reducing agent Substances 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 239000008367 deionised water Substances 0.000 claims description 14
- 229910021641 deionized water Inorganic materials 0.000 claims description 14
- 238000003756 stirring Methods 0.000 claims description 14
- 229910052799 carbon Inorganic materials 0.000 claims description 10
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 claims description 6
- 230000001590 oxidative effect Effects 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 4
- NWZSZGALRFJKBT-KNIFDHDWSA-N (2s)-2,6-diaminohexanoic acid;(2s)-2-hydroxybutanedioic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O.NCCCC[C@H](N)C(O)=O NWZSZGALRFJKBT-KNIFDHDWSA-N 0.000 claims description 3
- ZZZCUOFIHGPKAK-UHFFFAOYSA-N D-erythro-ascorbic acid Natural products OCC1OC(=O)C(O)=C1O ZZZCUOFIHGPKAK-UHFFFAOYSA-N 0.000 claims description 3
- 229930003268 Vitamin C Natural products 0.000 claims description 3
- IKDUDTNKRLTJSI-UHFFFAOYSA-N hydrazine monohydrate Substances O.NN IKDUDTNKRLTJSI-UHFFFAOYSA-N 0.000 claims description 3
- 235000019154 vitamin C Nutrition 0.000 claims description 3
- 239000011718 vitamin C Substances 0.000 claims description 3
- 230000003647 oxidation Effects 0.000 claims 1
- 238000007254 oxidation reaction Methods 0.000 claims 1
- 238000007599 discharging Methods 0.000 abstract description 4
- 230000002035 prolonged effect Effects 0.000 abstract description 4
- 238000009776 industrial production Methods 0.000 abstract description 3
- -1 stirring uniformly Substances 0.000 description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 4
- 239000010408 film Substances 0.000 description 3
- 238000001914 filtration Methods 0.000 description 2
- 239000005457 ice water Substances 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000001291 vacuum drying Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- FHKPLLOSJHHKNU-INIZCTEOSA-N [(3S)-3-[8-(1-ethyl-5-methylpyrazol-4-yl)-9-methylpurin-6-yl]oxypyrrolidin-1-yl]-(oxan-4-yl)methanone Chemical compound C(C)N1N=CC(=C1C)C=1N(C2=NC=NC(=C2N=1)O[C@@H]1CN(CC1)C(=O)C1CCOCC1)C FHKPLLOSJHHKNU-INIZCTEOSA-N 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000004299 exfoliation Methods 0.000 description 1
- 238000009396 hybridization Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000033116 oxidation-reduction process Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Inorganic materials [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/362—Composites
- H01M4/364—Composites as mixtures
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/36—Selection of substances as active materials, active masses, active liquids
- H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/624—Electric conductive fillers
- H01M4/625—Carbon or graphite
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Carbon And Carbon Compounds (AREA)
Abstract
The invention discloses a cathode material for a graphene battery and a preparation method thereof, wherein titanium, platinum, tungsten, molybdenum and lithium are doped in conductive graphite, so that the high specific capacity of the cathode material is ensured, and the conductivity of the cathode material can be improved; the cathode material consists of three structures, namely a base material, a conductive graphite, titanium, platinum, tungsten, molybdenum and lithium mixture and graphene, from inside to outside, and the cathode material of the structure has high conductivity and large specific capacity, and keeps high specific capacity of the cathode after multiple charging/discharging cycles, so that the cycle life of the graphene battery is prolonged. In addition, the preparation method of the cathode material for the graphene battery provided by the invention is simple in process, low in raw material cost and suitable for industrial production.
Description
Technical Field
The invention relates to the field of batteries, in particular to a cathode material for a graphene battery and a preparation method thereof.
Background
Graphene is a honeycomb-shaped planar thin film formed by carbon atoms in an sp2 hybridization manner, is a quasi-two-dimensional material with the thickness of only one atomic layer, and is also called monoatomic layer graphite. Physicists of manchester university, england, andelid and consuding norworth schoft successfully separated graphene from graphite by micromechanical exfoliation, thus collectively awarding the 2010 nobel prize for physics. Common powder production methods of graphene are a mechanical stripping method and an oxidation-reduction method, and a film production method is a chemical vapor deposition method. Due to its excellent strength, flexibility, electrical conductivity, thermal conductivity and optical properties, it has been developed in the fields of physics, materials science, electronic information, computer, aerospace and the like.
In the aspect of energy storage, graphene is also vigorously researched and developed by researchers in recent years. Two-dimensional film materials have also been studied in the industry as one form in which graphene can be functionalized, and nowadays, high conductivity, high strength and excellent toughness exhibited by graphene films that are self-assembled and closely packed layer by layer are also of great interest in the industry. However, when graphene is used for manufacturing an electrode in a battery at present, the specific capacity is low, and the cycle life is poor.
Disclosure of Invention
In view of the above, the present invention provides a cathode material for a graphene battery, which has a high specific capacity and a long battery cycle life, and a preparation method thereof.
In order to achieve the above purpose, the invention provides the following technical scheme:
a cathode material for a graphene battery comprises the following raw materials in parts by weight:
preferably, the substrate is a carbon rod, a graphite rod or a tungsten rod.
The invention also provides a preparation method of the cathode material for the graphene battery, which comprises the following steps:
a) adding carbon black, titanium, platinum, tungsten, molybdenum and lithium into polyimide conductive adhesive in a vacuum glove box under a vacuum environment, uniformly stirring, coating the mixture on the surface of a substrate, and drying to obtain a primary cathode substrate;
b) oxidizing graphite into graphite oxide, dispersing the graphite oxide in deionized water, and adding a reducing agent to obtain a pre-reduced graphene solution;
c) coating the pre-reduced graphene solution obtained in the step b) on the surface of the primary cathode substrate, performing laser irradiation, and drying to obtain the cathode material for the graphene battery.
Preferably, the reducing agent is vitamin C and hydrazine hydrate.
Preferably, the mass ratio of the reducing agent to the graphite is 1: 2-3.
Preferably, the preparation method for oxidizing graphite into the graphite oxide solution is a Hummers method.
The invention provides a cathode material for a graphene battery and a preparation method thereof, wherein titanium, platinum, tungsten, molybdenum and lithium are doped in conductive graphite, so that the high specific capacity of the cathode material is ensured, and the conductivity of the cathode material can be improved; the cathode material consists of three structures, namely a base material, a conductive graphite, titanium, platinum, tungsten, molybdenum and lithium mixture and graphene, from inside to outside, and the cathode material of the structure has high conductivity and large specific capacity, and keeps high specific capacity of the cathode after multiple charging/discharging cycles, so that the cycle life of the graphene battery is prolonged. In addition, the preparation method of the cathode material for the graphene battery provided by the invention is simple in process, low in raw material cost and suitable for industrial production.
Detailed Description
The invention provides a cathode material for a graphene battery, which comprises the following raw materials in parts by weight:
in the technical scheme, the conductive graphite is doped with titanium, platinum, tungsten, molybdenum and lithium, so that the high specific capacity of the cathode material is ensured, and the conductivity of the cathode material can be improved; the cathode material consists of three structures, namely a base material, a conductive graphite, titanium, platinum, tungsten, molybdenum and lithium mixture and graphene, from inside to outside, and the cathode material of the structure has high conductivity and large specific capacity, and keeps high specific capacity of the cathode after multiple charging/discharging cycles, so that the cycle life of the graphene battery is prolonged.
The substrate plays a conductive role in the graphite battery. In an embodiment of the invention, the substrate is a carbon rod, a graphite rod or a tungsten rod.
In the invention, the weight part of the base material is 80-100 parts; in the embodiment of the invention, the weight part of the base material is 85-95 parts; in other embodiments, the weight portion of the base material is 88 to 92.
The polyimide conductive adhesive can enable carbon black, titanium, platinum, tungsten, molybdenum and lithium to be firmly adhered to a base material, improve the cycle performance and safety performance of a cathode material and prolong the cycle service life of a graphene battery. In the invention, the polyimide conductive adhesive is 2-3 parts by weight; in the embodiment of the invention, the weight part of the polyimide conductive adhesive is 2.2-2.8 parts; in other embodiments, the polyimide conductive adhesive is 2.4 to 2.6 parts by weight.
The graphene is used for improving the specific energy and the cycle life of the graphene battery. In the invention, the graphene accounts for 1-2 parts by weight; in the embodiment of the invention, the weight part of the graphene is 1.2-1.8 parts; in other embodiments, the graphene is 1.4 to 1.6 parts by weight.
The carbon black, the titanium, the platinum, the tungsten, the molybdenum and the lithium are used for reducing the contact resistance of the graphene and the base material and prolonging the cycle life of the battery. In the invention, the weight part of the carbon black is 1-2 parts; in the embodiment of the invention, the weight part of the carbon black is 1.2-1.8 parts; in other embodiments, the carbon black is present in an amount of 1.4 to 1.6 parts by weight.
In the invention, the weight part of titanium is 0.1-0.2; in the embodiment of the invention, the weight part of titanium is 0.12-0.17; in other embodiments, the weight portion of titanium is 0.14 to 0.16.
In the invention, the weight portion of platinum is 0.1-0.2; in the embodiment of the invention, the weight part of the platinum is 0.11-0.18; in other embodiments, the weight portion of platinum is 0.13-0.15.
In the invention, the weight part of tungsten is 0.05-0.08; in the embodiment of the invention, the weight part of tungsten is 0.055-0.075 part; in other embodiments, the weight portion of tungsten is 0.06-0.07.
In the invention, the weight part of molybdenum is 0.02-0.03; in the embodiment of the invention, the weight part of molybdenum is 0.023-0.027 parts; in other embodiments, the weight portion of molybdenum is 0.024-0.026.
In the invention, the weight part of lithium is 0.1-0.2; in the embodiment of the invention, the weight part of lithium is 0.12-0.17; in other embodiments, the weight portion of lithium is 0.13-0.15.
In an embodiment of the invention, the substrate is a carbon rod, a graphite rod or a tungsten rod.
The invention also provides a preparation method of the cathode material for the graphene battery, which comprises the following steps:
a) adding carbon black, titanium, platinum, tungsten, molybdenum and lithium into polyimide conductive adhesive in a vacuum glove box under a vacuum environment, uniformly stirring, coating the mixture on the surface of a substrate, and drying to obtain a primary cathode substrate;
b) oxidizing graphite into graphite oxide, dispersing the graphite oxide in deionized water, and adding a reducing agent to obtain a pre-reduced graphene solution;
c) coating the pre-reduced graphene solution obtained in the step b) on the surface of the primary cathode substrate, performing laser irradiation, and drying to obtain the cathode material for the graphene battery.
According to the technical scheme, the mixture of carbon black, titanium, platinum, tungsten, molybdenum, lithium and polyimide conductive adhesive is coated on the surface of the base material, and the pre-reduced graphene solution is coated on the surface of the primary cathode base material, so that the obtained cathode material is good in structural stability, low in contact resistance between graphene and the base material, high in conductivity and large in specific capacity, and high in specific capacity of the cathode after multiple charging/discharging cycles, and the cycle life of the graphene battery is prolonged. In addition, the preparation method of the cathode material for the graphene battery provided by the invention is simple in process, low in raw material cost and suitable for industrial production.
In an embodiment of the invention, the reducing agent is vitamin C or hydrazine hydrate.
In the embodiment of the invention, the mass ratio of the reducing agent to the graphite is 1: 2-3.
In the embodiment of the invention, the preparation method of oxidizing graphite into graphite oxide solution is Hummers method.
In the examples of the present invention, the Hummers method is to weigh 5g of flake graphite having a particle size of 300 meshAnd 2gNaNO3Moderating, adding 120mL concentrated sulfuric acid, stirring in ice-water bath, adding 20g KMnO after 30min4After reacting for 60min, moving the reaction kettle into a warm water bath at 40 ℃ for further reaction for 30min, then slowly adding 230mL of deionized water, keeping the reaction temperature at 98 ℃, stirring for 5min, adding a proper amount of hydrogen peroxide until no bubbles are generated, filtering while hot, washing the reaction kettle for multiple times by using deionized water and 5% hydrochloric acid until the reaction kettle is neutral, centrifuging the reaction kettle, and fully drying the reaction kettle in a vacuum drying oven at 60 ℃ to obtain the graphite oxide.
In order to further illustrate the present invention, the following examples are provided to describe a cathode material for a graphene battery and a method for preparing the same in detail, but they should not be construed as limiting the scope of the present invention.
Example 1
Weighing 5g of crystalline flake graphite with the particle size of 300 meshes and 2g of NaNO3Moderating, adding 120mL concentrated sulfuric acid, stirring in ice-water bath, adding 20g KMnO after 30min4After reacting for 60min, moving the reaction kettle into a warm water bath at 40 ℃ for further reaction for 30min, then slowly adding 230mL of deionized water, keeping the reaction temperature at 98 ℃, stirring for 5min, adding a proper amount of hydrogen peroxide until no bubbles are generated, filtering while hot, washing the reaction kettle for multiple times by using deionized water and 5% hydrochloric acid until the reaction kettle is neutral, centrifuging the reaction kettle, and fully drying the reaction kettle in a vacuum drying oven at 60 ℃ to obtain the graphite oxide.
Example 2
The cathode material for the graphene battery comprises the following raw materials in parts by weight:
85g of carbon rod, 2.2g of polyimide conductive adhesive, 1g of carbon black, 0.12g of titanium, 0.11g of platinum, 0.07g of tungsten, 0.026g of molybdenum and 0.13g of lithium;
the preparation method of the cathode material for the graphene battery comprises the following steps:
a) under the vacuum environment in a vacuum glove box, adding carbon black, titanium, platinum, tungsten, molybdenum and lithium into polyimide conductive adhesive, stirring uniformly, coating the mixture on the surface of a carbon rod, and drying to obtain a primary cathode substrate;
b) dispersing 1.5g of graphite oxide prepared in example 1 in deionized water, and adding a reducing agent to obtain a pre-reduced graphene solution;
c) coating the pre-reduced graphene solution obtained in the step b) on the surface of the primary cathode substrate, performing laser irradiation, and drying to obtain the cathode material for the graphene battery.
Example 3
The cathode material for the graphene battery comprises the following raw materials in parts by weight:
95g of tungsten rod, 2.6g of polyimide conductive adhesive, 1.8g of carbon black, 0.17g of titanium, 0.18g of platinum, 0.055g of tungsten, 0.03g of molybdenum and 0.12g of lithium;
the preparation method of the cathode material for the graphene battery comprises the following steps:
a) under the vacuum environment in a vacuum glove box, adding carbon black, titanium, platinum, tungsten, molybdenum and lithium into polyimide conductive adhesive, stirring uniformly, coating the mixture on the surface of a tungsten rod, and drying to obtain a primary cathode substrate;
b) dispersing 2g of graphite oxide prepared in example 1 in deionized water, and adding a reducing agent to obtain a pre-reduced graphene solution;
c) coating the pre-reduced graphene solution obtained in the step b) on the surface of the primary cathode substrate, performing laser irradiation, and drying to obtain the cathode material for the graphene battery.
Example 4
The cathode material for the graphene battery comprises the following raw materials in parts by weight:
88g of carbon rod, 2g of polyimide conductive adhesive, 1.2g of carbon black, 0.2g of titanium, 0.13g of platinum, 0.08g of tungsten, 0.027g of molybdenum and 0.17g of lithium;
the preparation method of the cathode material for the graphene battery comprises the following steps:
a) under the vacuum environment in a vacuum glove box, adding carbon black, titanium, platinum, tungsten, molybdenum and lithium into polyimide conductive adhesive, stirring uniformly, coating the mixture on the surface of a carbon rod, and drying to obtain a primary cathode substrate;
b) dispersing 2g of graphite oxide prepared in example 1 in deionized water, and adding a reducing agent to obtain a pre-reduced graphene solution;
c) coating the pre-reduced graphene solution obtained in the step b) on the surface of the primary cathode substrate, performing laser irradiation, and drying to obtain the cathode material for the graphene battery.
Example 5
The cathode material for the graphene battery comprises the following raw materials in parts by weight:
80g of graphite rod, 3g of polyimide conductive adhesive, 1.6g of carbon black, 0.1g of titanium, 0.2g of platinum, 0.06g of tungsten, 0.023g of molybdenum and 0.1g of lithium;
the preparation method of the cathode material for the graphene battery comprises the following steps:
a) under the vacuum environment in a vacuum glove box, adding carbon black, titanium, platinum, tungsten, molybdenum and lithium into polyimide conductive adhesive, stirring uniformly, coating the mixture on the surface of a graphite rod, and drying to obtain a primary cathode substrate;
b) dispersing 1.8g of graphite oxide prepared in example 1 in deionized water, and adding a reducing agent to obtain a pre-reduced graphene solution;
c) coating the pre-reduced graphene solution obtained in the step b) on the surface of the primary cathode substrate, performing laser irradiation, and drying to obtain the cathode material for the graphene battery.
Example 6
The cathode material for the graphene battery comprises the following raw materials in parts by weight:
92g of tungsten rod, 2.8g of polyimide conductive adhesive, 1.4g of carbon black, 0.16g of titanium, 0.15g of platinum, 0.075g of tungsten, 0.024g of molybdenum and 0.2g of lithium;
the preparation method of the cathode material for the graphene battery comprises the following steps:
a) under the vacuum environment in a vacuum glove box, adding carbon black, titanium, platinum, tungsten, molybdenum and lithium into polyimide conductive adhesive, stirring uniformly, coating the mixture on the surface of a tungsten rod, and drying to obtain a primary cathode substrate;
b) dispersing 1.5g of graphite oxide prepared in example 1 in deionized water, and adding a reducing agent to obtain a pre-reduced graphene solution;
c) coating the pre-reduced graphene solution obtained in the step b) on the surface of the primary cathode substrate, performing laser irradiation, and drying to obtain the cathode material for the graphene battery.
Example 7
The cathode material for the graphene battery comprises the following raw materials in parts by weight:
100g of carbon rod, 2.4g of polyimide conductive adhesive, 2g of carbon black, 0.14g of titanium, 0.1g of platinum, 0.05g of tungsten, 0.02g of molybdenum and 0.15g of lithium;
the preparation method of the cathode material for the graphene battery comprises the following steps:
a) under the vacuum environment in a vacuum glove box, adding carbon black, titanium, platinum, tungsten, molybdenum and lithium into polyimide conductive adhesive, stirring uniformly, coating the mixture on the surface of a carbon rod, and drying to obtain a primary cathode substrate;
b) dispersing 1.8g of graphite oxide prepared in example 1 in deionized water, and adding a reducing agent to obtain a pre-reduced graphene solution;
c) coating the pre-reduced graphene solution obtained in the step b) on the surface of the primary cathode substrate, performing laser irradiation, and drying to obtain the cathode material for the graphene battery.
Example 8
The cathode material for the graphene battery comprises the following raw materials in parts by weight:
90g of graphite rod, 2.5g of polyimide conductive adhesive, 1.5g of carbon black, 0.15g of titanium, 0.14g of platinum, 0.065g of tungsten, 0.025g of molybdenum and 0.14g of lithium;
the preparation method of the cathode material for the graphene battery comprises the following steps:
a) under the vacuum environment in a vacuum glove box, adding carbon black, titanium, platinum, tungsten, molybdenum and lithium into polyimide conductive adhesive, stirring uniformly, coating the mixture on the surface of a graphite rod, and drying to obtain a primary cathode substrate;
b) dispersing 1.5g of graphite oxide prepared in example 1 in deionized water, and adding a reducing agent to obtain a pre-reduced graphene solution;
c) coating the pre-reduced graphene solution obtained in the step b) on the surface of the primary cathode substrate, performing laser irradiation, and drying to obtain the cathode material for the graphene battery.
The conductivity of the cathode material of the graphene battery prepared in the example 2-8 was tested, and the cathode material was put into the graphene battery for testing, and the first discharge capacity of 1C and the discharge capacity after 500 cycles were recorded, and the results are shown in table 1.
The previous description is provided to enable any person skilled in the art to make or use the present disclosure, and is provided in the context of a computer-implemented process. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. The cathode material for the graphene battery is characterized by comprising the following raw materials in parts by weight:
80-100 parts of a base material;
2-3 parts of polyimide conductive adhesive;
1-2 parts of graphene;
1-2 parts of carbon black;
0.1-0.2 part of titanium;
0.1-0.2 parts of platinum;
0.05-0.08 part of tungsten;
0.02-0.03 part of molybdenum;
0.1-0.2 part of lithium.
2. The cathode material of claim 1, wherein the substrate is a carbon rod, a graphite rod, or a tungsten rod.
3. A method for preparing the cathode material for graphene batteries according to claim 1 or 2, comprising the steps of:
a) adding carbon black, titanium, platinum, tungsten, molybdenum and lithium into polyimide conductive adhesive in a vacuum glove box under a vacuum environment, uniformly stirring, coating the mixture on the surface of a substrate, and drying to obtain a primary cathode substrate;
b) oxidizing graphene into graphene oxide, dispersing the graphene oxide in deionized water, and adding a reducing agent to obtain a pre-reduced graphene solution;
c) coating the pre-reduced graphene solution obtained in the step b) on the surface of the primary cathode substrate, performing laser irradiation, and drying to obtain the cathode material for the graphene battery.
4. The method according to claim 3, wherein the reducing agent is vitamin C or hydrazine hydrate.
5. The preparation method according to claim 3, wherein the mass ratio of the reducing agent to the graphite is 1:2 to 3.
6. The method according to claim 3, wherein the method for producing graphene oxide by oxidation of graphene is Hummers method.
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| CN201810669859.XA CN108807932B (en) | 2018-06-26 | 2018-06-26 | Cathode material for graphene battery and preparation method thereof |
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