CN104681793A - A kind of preparation method of negative electrode material for high-capacity high-density lithium-ion battery - Google Patents
A kind of preparation method of negative electrode material for high-capacity high-density lithium-ion battery Download PDFInfo
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- CN104681793A CN104681793A CN201410843217.9A CN201410843217A CN104681793A CN 104681793 A CN104681793 A CN 104681793A CN 201410843217 A CN201410843217 A CN 201410843217A CN 104681793 A CN104681793 A CN 104681793A
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 52
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 52
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 239000007773 negative electrode material Substances 0.000 title abstract 2
- 239000010406 cathode material Substances 0.000 claims abstract description 28
- 239000000843 powder Substances 0.000 claims abstract description 20
- 239000000463 material Substances 0.000 claims abstract description 18
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 17
- 238000005087 graphitization Methods 0.000 claims abstract description 15
- 239000000654 additive Substances 0.000 claims abstract description 11
- 230000000996 additive effect Effects 0.000 claims abstract description 11
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- 239000000047 product Substances 0.000 claims description 20
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- 229920001971 elastomer Polymers 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 9
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 8
- 229910052744 lithium Inorganic materials 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 239000010426 asphalt Substances 0.000 claims description 7
- 239000011230 binding agent Substances 0.000 claims description 7
- 238000010304 firing Methods 0.000 claims description 7
- 235000019580 granularity Nutrition 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 7
- 239000003208 petroleum Substances 0.000 claims description 7
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- 238000003825 pressing Methods 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 7
- 238000007493 shaping process Methods 0.000 claims description 7
- 239000006258 conductive agent Substances 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 5
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 239000003822 epoxy resin Substances 0.000 claims description 4
- 239000000284 extract Substances 0.000 claims description 4
- 238000002803 maceration Methods 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 239000005543 nano-size silicon particle Substances 0.000 claims description 4
- 229920001568 phenolic resin Polymers 0.000 claims description 4
- 239000005011 phenolic resin Substances 0.000 claims description 4
- 229920002239 polyacrylonitrile Polymers 0.000 claims description 4
- 229920000647 polyepoxide Polymers 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 239000002033 PVDF binder Substances 0.000 claims description 3
- 239000011889 copper foil Substances 0.000 claims description 3
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims description 3
- YLQBMQCUIZJEEH-UHFFFAOYSA-N Furan Chemical compound C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 claims description 2
- 239000004793 Polystyrene Substances 0.000 claims description 2
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 2
- 239000011294 coal tar pitch Substances 0.000 claims description 2
- 229920005546 furfural resin Polymers 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 239000002105 nanoparticle Substances 0.000 claims description 2
- 239000011295 pitch Substances 0.000 claims description 2
- 239000006253 pitch coke Substances 0.000 claims description 2
- 229920002223 polystyrene Polymers 0.000 claims description 2
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- 229920005989 resin Polymers 0.000 claims description 2
- 239000011347 resin Substances 0.000 claims description 2
- 238000012216 screening Methods 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 239000010703 silicon Substances 0.000 claims description 2
- 238000005245 sintering Methods 0.000 claims description 2
- 230000002441 reversible effect Effects 0.000 abstract description 2
- 125000004122 cyclic group Chemical group 0.000 abstract 1
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- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- 241000209094 Oryza Species 0.000 description 2
- 235000007164 Oryza sativa Nutrition 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 235000009566 rice Nutrition 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
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- 238000012360 testing method Methods 0.000 description 2
- 238000001291 vacuum drying Methods 0.000 description 2
- 229910012851 LiCoO 2 Inorganic materials 0.000 description 1
- 229910013870 LiPF 6 Inorganic materials 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- JDZCKJOXGCMJGS-UHFFFAOYSA-N [Li].[S] Chemical compound [Li].[S] JDZCKJOXGCMJGS-UHFFFAOYSA-N 0.000 description 1
- 239000005030 aluminium foil Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
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- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000007770 graphite material Substances 0.000 description 1
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- 238000011056 performance test Methods 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- 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
- H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
- H01M4/139—Processes of manufacture
- H01M4/1393—Processes of manufacture of electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
-
- 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
- H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
- H01M4/583—Carbonaceous material, e.g. graphite-intercalation compounds or CFx
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- 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)
- Engineering & Computer Science (AREA)
- Inorganic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention aims to provide a preparation method of a high-capacity high-pressure-density lithium ion battery cathode material, which comprises the steps of processing a base material into powder with the particle size of 1-20 microns, carrying out high-temperature treatment at the temperature of 1500 ℃ for 3-12 hours to obtain graphite powder, kneading and crushing the graphite powder, an additive and an adhesive together, grinding the graphite powder, carrying out high-pressure molding to obtain a semi-finished product, and carrying out impregnation-roasting cyclic treatment on the high-pressure-molded semi-finished product for 2-8 times; and then carrying out high-temperature graphitization treatment and grinding processing to obtain the negative electrode material for the high-capacity high-pressure-density lithium ion battery. The prepared lithium ion battery cathode material has high reversible capacity of more than or equal to 400mAh/g and high pressure density of more than or equal to 1.7g/cm3 and has a stable structure, and the lithium ion battery prepared by the lithium ion battery cathode material has higher capacity and better cycle efficiency.
Description
Technical field
The present invention relates to cathode of lithium battery electrode material preparation field, be specifically related to the present invention relates to a kind of high power capacity height densification cathode material of lithium ion battery and preparation method thereof.
Background technology
Along with popularizing of the mobile internet device such as smart mobile phone and notebook computer, the popularization of the electric vehicle such as electric bicycle and battery-operated motor cycle, and the development of the aeronautical and space technology such as unmanned plane and space probe, performance of lithium ion battery is faced with higher demand for development, and volume is little, energy density height has become the research direction of high performance lithium ion battery.
Because high-energy type lithium ion battery is at the advanced information processing terminal. most important in the grand strategy such as equipment and electric automobile field, although extremely the energy density of the current commercial lithium ion battery of the concern of people has reached 150 ~ 200W h/kg, but be subject to the restriction of traditional positive electrode and the theoretical lithium storage content limit of carbon negative pole material self, be difficult to improve its energy density further. therefore, sight is turned to new high-energy-density electrode material system and the high-energy density lithium secondary cell system based on new principle by people, as lithium-sulfur cell, but lithium-air battery etc. how steadily to control the electrochemical reaction of these high energy system, ensure Efficient Conversion and the storage of energy, the huge challenge of this field face at present. the practical exploitation depending on high performance electrode material of these novel secondary batteries.
Whole world lithium ion battery consumer goods development is rapid: lithium ion battery has the advantages such as operating voltage is high, volume is little, memory-less effect, pollution-free, self discharge is little, have extended cycle life, the electronic products such as mobile phone, notebook computer, PDA, digital camera and portable type CD are widely used at present, wherein notebook computer accounts for 23%, mobile phone accounts for 50%, is maximum field.At present, the 3G such as electronic information, communication product forward wireless penetration and can the future development of carrying, also more and more tend to " light, thin, little " the profile of product and the requirement of high-performance assembly, lithium ion battery is then the source of best power supply supply.Along with the development of the portable electric such as mobile phone, notebook computer equipment, the market scale of global lithium ion battery is wide.
Domestic lithium ion battery prospect of industrial development: at present, the lithium ion battery industry development of China is rapid, the space being only second to Japan and market growth in production is very large, but the technology of our lithium ion battery is still in the low end trim in the whole world, because the requirement of 3G mobile to multimedia function is higher, and the functions such as color screen, camera, bluetooth, game and Streaming Media or application power consumption higher, cause most of 3G mobile to be all faced with the problems such as battery capacity is little, standby, the operating time is short.Present stage, the battery that 3G mobile is equipped with is based on lithium ion battery, and what believe that within a period of time in future 3G mobile is equipped with will be lithium ion battery.
But the defect that at present lithium ion battery exists has cycle performance of lithium ion battery also to need to improve, the compacted density of negative material and the cycle performance of lithium ion battery closely related, the compacted density for this reason how improving negative material is the key of dealing with problems.
Summary of the invention
The object of the present invention is to provide a kind of preparation method of high power capacity height densification cathode material of lithium ion battery, realized by following scheme:
A kind of preparation method of high power capacity height densification cathode material of lithium ion battery, after comprising powder base material being processed as 1-20 μm through 300-1500 DEG C within high-temperature process 3-12 hour, become graphite powder, by broken for graphite powder kneading together with additive, adhesive, after abrasive dust, high-pressure molding is semi-finished product, the semi-finished product of high-pressure molding is carried out 2-8 dipping-firing cycles process; Then abrasive dust processing after high temperature graphitization process, obtained high power capacity height densification cathode material of lithium ion battery.
The weight ratio of described graphite powder, additive and adhesive is:
Graphite powder 45-98.9
Additive 1.1-30
Adhesive 1-25.
Described base material is any one or two kinds of mixing of petroleum coke, pitch coke; Described additive is one or more in the oxide of nanosilicon, the oxide of silicon, tin, tin.
Described adhesive is one or more in coal tar pitch, petroleum asphalt, epoxy resin, phenolic resins, polyacrylonitrile, polyvinyl alcohol, polystyrene.
Through broken, abrasive dust after graphite powder, additive and adhesive kneading, mix after screening obtains the particle of 10 to 500 μm of granularities, be filled in rubber mold, adopt the shaping press-powder of isostatic cool pressing technology, rubber mold is put into the high-pressure bottle that water or wet goods liquid medium are housed, be pressurized to 100 ~ 200MPa, be pressed into cylindrical or rectangular product.
Described maceration extract is the pitch of melting.
Described maceration extract be the furfural resin of melting, furane resins, epoxy resin, phenolic resins, polyacrylonitrile any one and more than.
Described sintering temperature is 500-1500 DEG C, and roasting time is 1-5 hour.
The temperature of described high temperature graphitization is 2800-3500 DEG C, and the processing time is 1-5 hour.
A kind of anode plate for lithium ionic cell, its preparation method for: the conductive agent of the restarting lithium ion battery negative material prepared by the present invention of 70-80 weight portion, the binding agent of 10-20 weight portion and 10 weight portions is by being mixed to get slurry, the slurry obtained is coated on Copper Foil, dry 5-24h, then Kun pressure and section, obtain restarting anode plate for lithium ionic cell; The weight ratio of prepared high power capacity height densification cathode material of lithium ion battery, binding agent and conductive agent is 8:1:1; Described binding agent is LA33 or polyvinylidene fluoride; Conductive agent is conductive black, conduction liquid or nano-sized carbon.
The invention has the advantages that:
Negative material prepared by the present invention is by repeatedly flooding coated, multiple high temp process, there is bulk density high, the strength of materials is large, be characterized in that the lithium ion battery negative material made has high reversible capacity >=400mAh/g, high densification >=1.7g/cm3, have stable structure, lithium ion battery prepared therefrom has higher capacity and better cycle efficieny.
Accompanying drawing explanation
Fig. 1 is the electromicroscopic photograph (300 times) of the high power capacity height densification cathode material of lithium ion battery of the embodiment of the present invention 1.
Fig. 2 is the electromicroscopic photograph (1000 times) of the high power capacity height densification cathode material of lithium ion battery of the embodiment of the present invention 1.
Fig. 3 is the XRD figure of the high power capacity height densification cathode material of lithium ion battery of the embodiment of the present invention 1.
Embodiment
The further detailed description the present invention of following examples, but the present invention is not limited to this embodiment.
Embodiment 1
Take 1000g petroleum coke and be processed into 10 μm of powder through abrasive dust, the powder ground is reacted 12 hours in reactor 1500 DEG C, reacted product and 500g petroleum asphalt carry out kneading, thickener through broken, abrasive dust, and mixes after being sieved into the particle of 15 μm of granularities, adopts the shaping press-powder of isostatic cool pressing technology, be filled in rubber mold, put into the high-pressure bottle that water or wet goods liquid medium are housed, be pressurized to 100 ~ 200MPa, be pressed into cylindrical or rectangular product.Then carry out roasting, through dipping-firing cycles repeatedly.Goods after roasting are heated to about 3 000 DEG C of graphitizations, and the product after graphitization is processed through abrasive dust, and make a kind of high power capacity height densification cathode material of lithium ion battery, electromicroscopic photograph is as Fig. 1, Fig. 2, and X-ray diffraction photo is as Fig. 3.
Embodiment 2
Take 1000g petroleum coke and be processed into 10 μm of powder through abrasive dust, the powder ground is reacted 12 hours in reactor 1500 DEG C, reacted product, 100g nanosilicon and 500g petroleum asphalt carry out kneading, thickener is through broken, abrasive dust, and mix after being sieved into the particle of 15 μm of granularities, adopt the shaping press-powder of isostatic cool pressing technology, be filled in rubber mold, put into the high-pressure bottle that water or wet goods liquid medium are housed, be pressurized to 100 ~ 200MPa, be pressed into cylindrical or rectangular product.Then carry out roasting, through dipping-firing cycles repeatedly.Goods after roasting are heated to about 3 000 DEG C of graphitizations, and the product after graphitization is processed through abrasive dust, makes a kind of high power capacity height densification cathode material of lithium ion battery
Embodiment 3
Take 1000g petroleum coke and be processed into 10 μm of powder through abrasive dust, the powder ground is reacted 12 hours in reactor 1500 DEG C, reacted product, 200g nanosilicon and 500g petroleum asphalt carry out kneading, thickener is through broken, abrasive dust, and mix after being sieved into the particle of 15 μm of granularities, adopt the shaping press-powder of isostatic cool pressing technology, be filled in rubber mold, put into the high-pressure bottle that water or wet goods liquid medium are housed, be pressurized to 100 ~ 200MPa, be pressed into cylindrical or rectangular product.Then carry out roasting, through dipping-firing cycles repeatedly.Goods after roasting are heated to about 3 000 DEG C of graphitizations, and the product after graphitization is processed through abrasive dust, makes a kind of high power capacity height densification cathode material of lithium ion battery
Embodiment 4
Take 1000g petroleum coke and be processed into 10 μm of powder through abrasive dust, the powder ground is reacted 12 hours in reactor 1500 DEG C, reacted product, 200g sodium rice silica and 500g petroleum asphalt carry out kneading, thickener is through broken, abrasive dust, and mix after being sieved into the particle of 15 μm of granularities, adopt the shaping press-powder of isostatic cool pressing technology, be filled in rubber mold, put into the high-pressure bottle that water or wet goods liquid medium are housed, be pressurized to 100 ~ 200MPa, be pressed into cylindrical or rectangular product.Then carry out roasting, through dipping-firing cycles repeatedly.Goods after roasting are heated to about 3 000 DEG C of graphitizations, and the product after graphitization is processed through abrasive dust, makes a kind of high power capacity height densification cathode material of lithium ion battery
Embodiment 5
Take 1000g petroleum coke and be processed into 10 μm of powder through abrasive dust, the powder ground is reacted 12 hours in reactor 1500 DEG C, reacted product, 200g sodium rice glass putty and 500g petroleum asphalt carry out kneading, thickener is through broken, abrasive dust, and mix after being sieved into the particle of 15 μm of granularities, adopt the shaping press-powder of isostatic cool pressing technology, be filled in rubber mold, put into the high-pressure bottle that water or wet goods liquid medium are housed, be pressurized to 100 ~ 200MPa, be pressed into cylindrical or rectangular product.Then carry out roasting, through dipping-firing cycles repeatedly.Goods after roasting are heated to about 3 000 DEG C of graphitizations, and the product after graphitization is processed through abrasive dust, makes a kind of high power capacity height densification cathode material of lithium ion battery.
Electrochemical property test
For detecting the performance of lithium ion battery negative material of the present invention, test by half-cell method of testing, negative material with above embodiment and comparative example: SBR (solid content 50%): CMC=96.5:1.8:1.7 (weight ratio), add appropriate amount of deionized water and reconcile into pulpous state, to coat on Copper Foil and within 12 hours, to make negative plate in vacuum drying chamber inner drying; Use LiCoO
2for positive electrode active materials, mix according to 94:3 (weight ratio) with binding agent PVDF, add appropriate NMP as dispersant furnishing slurry, be coated on aluminium foil, and make positive plate in vacuum drying chamber inner drying; Electrolyte is 1M LiPF
6/ EC+DEC+DMC=1:1:1, microporous polypropylene membrane is barrier film, is assembled into battery.Cycle performance test uses having put of 300mA to carry out constant current charge-discharge experiment, and charging/discharging voltage is limited in 4.2-3.0V, and the discharge and recharge cabinet computerizedd control carries out collection and the control of data.
Table 1 lists the negative material Performance comparision of different embodiment and comparative example.
The performance of the negative material that table 1 is prepared for each embodiment
By composite graphite material obtained for the compound of two class temper carbon particles is had high power capacity, high-pressure solid, high-rate characteristics, applicable high power capacity fills or the lithium rechargeable battery of high power capacity heavy-current discharge demand soon.Material first discharge capacity reaches 356-360mAh/g, initial coulomb efficiency 92.5%-93.0%; Particularly high rate during charging-discharging is obviously better than comparative example, 1C charging constant current Capacity Ratio 94.6%-95.5%, 2C charging constant current Capacity Ratio 92.3%-93.0%, 10C reaches 95%-96.2% than 1C discharge capacity ratio, 1C/10C 50 weeks circulation conservation rate 99.0%-99.5%.
Above-described embodiment is the present invention's preferably execution mode; but embodiments of the present invention are not restricted to the described embodiments; change, the modification done under other any does not deviate from Spirit Essence of the present invention and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (10)
1. the preparation method of a high power capacity height densification cathode material of lithium ion battery, after comprising powder base material being processed as 1-20 μm through 300-1500 DEG C within high-temperature process 3-12 hour, become graphite powder, by broken for graphite powder kneading together with additive, adhesive, after abrasive dust, high-pressure molding is semi-finished product, the semi-finished product of high-pressure molding is carried out 2-8 dipping-firing cycles process; Then abrasive dust processing after high temperature graphitization process, obtained high power capacity height densification cathode material of lithium ion battery.
2. the preparation method of high power capacity height densification cathode material of lithium ion battery according to claim 1, the weight ratio of described graphite powder, additive and adhesive is:
Graphite powder 45-98.9
Additive 1.1-30
Adhesive 1-25.
3. the preparation method of high power capacity height densification cathode material of lithium ion battery according to claim 1, described base material is any one or two kinds of mixing of petroleum coke, pitch coke; Described additive is one or more in the oxide of nanosilicon, the oxide of silicon, tin, tin.
4. the preparation method of high power capacity height densification cathode material of lithium ion battery according to claim 1, described adhesive is one or more in coal tar pitch, petroleum asphalt, epoxy resin, phenolic resins, polyacrylonitrile, polyvinyl alcohol, polystyrene.
5. the preparation method of high power capacity height densification cathode material of lithium ion battery according to claim 1, through broken, abrasive dust after graphite powder, additive and adhesive kneading, mix after screening obtains the particle of 10 to 500 μm of granularities, be filled in rubber mold, adopt the shaping press-powder of isostatic cool pressing technology, rubber mold is put into the high-pressure bottle that water or wet goods liquid medium are housed, be pressurized to 100 ~ 200 MPa, be pressed into cylindrical or rectangular product.
6. the preparation method of high power capacity height densification cathode material of lithium ion battery according to claim 1, described maceration extract is the pitch of melting.
7. the preparation method of high power capacity height densification cathode material of lithium ion battery according to claim 1, described maceration extract be the furfural resin of melting, furane resins, epoxy resin, phenolic resins, polyacrylonitrile any one and more than.
8. the preparation method of high power capacity height densification cathode material of lithium ion battery according to claim 1, described sintering temperature is 500-1500 DEG C, and roasting time is 1-5 hour.
9. the preparation method of high power capacity height densification cathode material of lithium ion battery according to claim 1, the temperature of described high temperature graphitization is 2800-3500 DEG C, and the processing time is 1-5 hour.
10. an anode plate for lithium ionic cell, its preparation method for: the conductive agent of the restarting lithium ion battery negative material described in any one of claim 1-9 of 70-80 weight portion, the binding agent of 10-20 weight portion and 10 weight portions is by being mixed to get slurry, the slurry obtained is coated on Copper Foil, dry 5-24h, then Kun pressure and section, obtain restarting anode plate for lithium ionic cell; The weight ratio of prepared high power capacity height densification cathode material of lithium ion battery, binding agent and conductive agent is 8:1:1; Described binding agent is LA33 or polyvinylidene fluoride; Conductive agent is conductive black, conduction liquid or nano-sized carbon.
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