CN103035919A - Method for preparing modified graphite negative electrode material of lithium ion power battery - Google Patents
Method for preparing modified graphite negative electrode material of lithium ion power battery Download PDFInfo
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- CN103035919A CN103035919A CN2012105410709A CN201210541070A CN103035919A CN 103035919 A CN103035919 A CN 103035919A CN 2012105410709 A CN2012105410709 A CN 2012105410709A CN 201210541070 A CN201210541070 A CN 201210541070A CN 103035919 A CN103035919 A CN 103035919A
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- H01M4/02—Electrodes composed of, or comprising, active material
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- 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
- H01M4/386—Silicon or alloys based on silicon
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- 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
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- 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
- H01M4/587—Carbonaceous material, e.g. graphite-intercalation compounds or CFx for inserting or intercalating light metals
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- H—ELECTRICITY
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- H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
- H01M4/621—Binders
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- 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
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- 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
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- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention relates to a method for preparing a modified graphite negative electrode material of a lithium ion power battery. The method particularly comprises the following steps: adding asphalt and resin into a kneading kettle with heating and stirring devices, heating until the asphalt and the resin are melted into liquid, continuously stirring, stopping heating after mixing uniformly and cooling to obtain a composite coating material block; performing coarse crushing on the composite coating material block and performing ultrafine crushing by using an airflow crushing machine or a cryogenic crushing machine to obtain composite coating material ultrafine powder; completely mixing the composite coating material ultrafine powder and graphite to obtain uniform powder; and performing heating, heat preservation and natural cooling on the uniform powder under the protection of inert gas, and sieving after cooling to obtain the modified graphite negative electrode material of the lithium ion power battery. The most outstanding innovation points are that the coating material precursor is subjected to compound treatment and coated by the graphite; the mixing uniformity of various coating material precursors is guaranteed, any solvents are not required, and environmental friendliness is realized; in addition, the process is simple, low in cost and easy in industrialized production.
Description
Technical field
The present invention relates to field of batteries, be specially a kind of preparation method of modified graphite cathode material of lithium-ion power battery, the skin of the modified graphite cathode material of the method preparation is the superpacket coating that is jointly formed by pitch and resin.
Background technology
Along with the development of automobile industry, the exhaustion of the non-renewable fossil fuels such as oil, natural gas receives publicity day by day, and air pollution and room temperature effect also become global problem.For solving energy problem, realize low-carbon environment-friendly, based on the development level of present energy technology, electric vehicle engineering becomes the emphasis direction of global economy development gradually, the countries such as the U.S., Japan, Germany, China in succession limit fuel vehicle and use, and greatly develop electric motor car.Core component as electric automobile---electrokinetic cell has also welcome large good opportunity to develop.Electrokinetic cell refers to be applied to the battery of electric motor car, comprise lithium ion battery, lead-acid battery, fuel cell etc., wherein, the advantage such as specific energy is high, specific power is large, self discharge is few because having for lithium ion battery, long service life and fail safe are good has become the emphasis of present various countries development.
Embedding/take off embedding current potential, suitable reversible capacity and aboundresources, the advantage such as cheap and have lower lithium as the graphite type material of lithium ion battery negative material, is more satisfactory lithium ion battery negative material.But it also exists, and discharging efficiency is low first, cycle performance is poor, to shortcomings such as electrolyte selectivity height, graphite material is used is restricted.In order to solve the above-mentioned shortcoming of graphite material, people carry out modification by the whole bag of tricks to graphite, and the method that usually adopts at present is that carbon coats method.Yang Ruizhi etc. are at " the resin carbon coated graphite is as the research of lithium ion battery negative electrode " (" Journal of Inorganic Materials ", 2000, coat phenolic resins with the liquid impregnation method on the natural flake graphite surface 15(4): 712-718), use the constant current charge and discharge, the powder microelectrode cyclic voltammetry has been investigated the charge and discharge performance.Experimental result shows, through heat treated phenolic resins carbon coated graphite material to put a capacity higher, cycle life is longer, can be used as the negative material of high performance lithium ion battery.He Ming etc. are at " preparation of resin carbon-coated graphite and chemical property thereof " (" battery ", 2003, coat one deck resin carbon at natural micro crystal graphite particle surface 3(5): 281-284), coat and process the first irreversible capacity that can reduce natural micro crystal graphite, adopt and mix the method coated graphite that then disperses, inside is natural micro crystal graphite, and the outside is the phenolic resins pyrolysis carbon-coating of 1～2 μ m.The irreversible capacity that the lithium ion experimental cell records natural micro crystal graphite is 14%, and the irreversible capacity of coated graphite is 7%.Coat and process the irreversible capacity that can reduce to a great extent natural micro crystal graphite.Chen Meng etc. adopt the liquid phase coating method at the preparation and property of the pitch-coating native graphite " research " (" battery industry ", 2007,12(5): 298-302), pitch cracking carbon are coated on the natural spherical plumbago, to improve its cycle performance.Experimental result shows, native graphite is after pitch-coating, irreversible capacity loss has reduced to 32.5mAh/g from 125.5mAh/g, specific capacity has been brought up to 365.3mAh/g from 290.8mAh/g, capability retention after 50 circulations has brought up to 93.66% from 55.4%, has effectively improved the cycle performance of native graphite.
At present in the coating modification to graphite, all only hard charcoal precursor of independent resin-coated class or pitch class soft charcoal precursor.Chinese patent CN101604743A and CN1224251A etc. adopt resinae as clad material, major advantage is at low temperatures good fluidity of resin, can not only clad surface, and be easy to penetrate into graphite granule inside by the micropore in the graphite, tap density and electronic conductivity to the raising graphite granule are useful, can also be by heating, the methods such as catalyst or ultraviolet ray irradiation of introducing are solidified, can not melt distortion in the resin pyrolytic process, can not produce obvious expansion yet, but also there are some problems, mainly contain: the affinity of resinous material and graphite is relatively poor, therefore the Carbon Materials that obtains of their pyrolysis and graphite are in conjunction with insecure, on the low side by the Carbon Materials yield that the resin pyrolysis obtains, enbrittle, fugitive constituent is many in the resin pyrolytic process, specific area is higher, the cohesive force of resin is stronger, is easy to cause coated particle to bond together, the destruction of easily causing coating layer when pulverizing after the heat treatment.Above these problems have affected the compressibility of cycle efficieny, cyclical stability and the graphite electrode of resin-coating graphite material.
Chinese patent CN96198348.5 and CN03120199.6 etc., adopt pitch, petroleum tar, coal tar or their mixture coated graphite, the asphalt pyrolysis charcoal is less than the specific area of From Resin Char coated graphite, will get well with the affinity of graphite, structure is more firm, but pitch-coating is out of shape because of fusing in heating process, consumption too much also easily causes the mutually bonding of Coating Graphite Particles, consumption is very few easily to cause coating inhomogeneous, and is easy in the heating process expand, and affects the electrical property of graphite.
After Chinese patent CN101162775A adopts liquid phase method that pitch and resin are dissolved simultaneously, adding graphite mixes again, then steam solvent, heat-treat at last, the mixture of pitch and the formation of one or more resins is coated on graphite surface, improves cycle efficieny and cyclical stability and multiplying power property and the compressible performance of graphite.But the method also has some shortcomings in actual applications, adopt liquid phase method to need with an organic solvent, easily pollute, also very high to the requirement of dissolved matter pitch simultaneously---(quinoline insolubles content is not more than 12%), solvent is reclaimed in evaporation needs complicated equipment, easily cause investment excessive, these have caused being difficult to be applied in the suitability for industrialized production.
Chinese patent CN102082272A adopts hard charcoal precursor, soft charcoal precursor and hetero-atom modifier, and after graphite mixes in proportion, solidify first processing, carry out once more relatively low heat treatment, carry out at last the secondary high-temperature graphitization processing, obtain containing the lithium ion battery negative material that hard charcoal coats.But the method is owing to adopting the way that will reach four kinds of powders mixing under the normal-temperature solid-phase condition, at first be difficult to guarantee the uniformity of multiple clad material presoma mixing, secondly owing in two kinds of precursors, the proportion of soft charcoal precursor is too high, so also need secondary high temperature graphitization to process, otherwise can cause the specific capacity of final coated graphite material on the low side because the degree of graphitization of soft charcoal is on the low side.The final like this rising that can cause the production cost is difficult to the satisfying the market requirement inexpensive to product.
Chinese patent CN102030326A adopts twice coating---and first graphite is coated one deck pitch after 1300 ± 100 ℃ of carbonizations, coat again one deck resin 900 ± 50 ℃ of carbonizations, the graphite cathode material for preparing at graphitizing method more than 2500 ℃ at last.Be about to resin carbon and be coated on the bitumencarb, bitumencarb is coated on again on the graphite granule, forms the gradient-structure of different carbon-coatings.But the resin carbon that still coats of outermost layer in fact, the final like this specific area of clad material that can cause is bigger than normal, first Efficiency Decreasing.Simultaneously repeatedly charing and the graphitizing process production cost that can increase material affects the marketing of product.
Summary of the invention
The object of the present invention is to provide a kind of preparation method of modified graphite cathode material of lithium-ion power battery, the skin of the modified graphite cathode material of the method preparation is the superpacket coating that is jointly formed by pitch and resin; Asphalt carbon and resin carbon are pinned at together mutually, and be complementary not enough, improved the comprehensive electrochemical properties of coated graphite.
The present invention for the technical scheme that solves its technical problem employing is:
A kind of preparation method of modified graphite cathode material of lithium-ion power battery, concrete steps are as follows:
(1) preparation compound coating material block: pitch and resin are joined in the kneading still with heating and agitating device for 1:1.5～4 by weight, be heated to pitch and resin and all be fused into liquid, then constantly stir, mix rear stopped heating, cooling obtains compound coating material block;
(2) preparation compound coating material superfine powder: after the compound coating material block of step (1) preparation carried out coarse crushing, carry out ultra-fine grinding by airslide disintegrating mill or deep cooling crush machine again, obtain the compound coating material superfine powder of particle diameter below 6 μ m;
(3) mix: compound coating material superfine powder and graphite that step (2) is prepared are that 5～20:100 fully is mixed to get uniformed powder by weight;
(4) heat treatment: with step (3) uniformed powder under the protection of inert gas; speed with 1～20 ℃/min is warming up to 600～1300 ℃; be incubated 0.5～5h, cooling is sieved after the cooling and is namely obtained modified graphite cathode material of lithium-ion power battery naturally again.
The mixture of one or more in the condensation polycyclic polynuclear aromatic hydrocarbon that among the present invention, described pitch comprises coal tar pitch, petroleum asphalt, modified coal tar pitch, mesophase pitch, obtained by asphalt modifier, softening point is more than 100 ℃.
Among the present invention, described resin is thermoplastic resin, comprises one or more the mixture in furane resins, Lauxite, ethyl-amine resin, phenolic resins, epoxy resin and the polyformaldehyde methyl acrylate resin.
Among the present invention, the particle diameter of described compound coating material superfine powder is below 3 μ m.
Among the present invention, described graphite is native graphite or Delanium, and average grain diameter is 5～50 μ m, tap density 〉=0.7g/cm
3, specific area≤7m
2/ g.
Among the present invention, described inert gas is N
2Or Ar.
Graphite forms one deck solid electrolyte film (Solid Electrolyte Interphase is SEI) on its surface during as negative material in the first charge-discharge process.Solid electrolyte film is the formation that react to each other such as electrolyte, negative material and lithium ion, irreversibly consumes lithium ion, is a main factor that forms irreversible capacity; It two is in the process that lithium ion embeds, electrolyte easily and its be embedded in altogether in the process of moving out, electrolyte is reduced, the gaseous product that generates causes graphite flake layer to peel off, especially in containing the electrolyte of PC, graphite flake layer comes off the new interface of formation, causes further SEI to form, irreversible capacity increases, and cyclical stability descends simultaneously.And the degree of order of the amorphous carbon that forms after the phenolic resins pyrolysis is low, structure is more open, lithium ion can relatively freely embed therein and deviate from and impact that can be not large on its structure generation, therefore be not easy to occur efflorescence, RESEARCH OF PYROCARBON is coated on the graphite periphery as one deck barrier simultaneously, can effectively stop the effect of organic solvent and graphite body, thereby the caused graphite linings of inserting altogether that has prevented lithium ion and electrolyte is peeled off and efflorescence.But because resin is in heat treatment process, the little molecule in the resin is too much, can cause in overflow process that the surface of material produces too much space after coating, and the specific area of the graphite after causing coating is excessive and cause that irreversible capacity is excessive first.The compound coating material that adopts pitch and mixed with resin to form, form Pyrolytic carbon coating at graphite surface, not only utilized simultaneously the advantage of pitch and resin, both uniformity, operability have also been guaranteed, after Overheating Treatment, asphalt carbon and resin carbon are pinned at together mutually, complementary not enough, improved the comprehensive electrochemical properties of coated graphite, can also prepare different compound coating materials by the ratio of regulating pitch and resin simultaneously, thereby the specific area of control Coating Graphite Particles satisfies cyclicity and doubly forthright different requirements.
With prior art, the invention has the beneficial effects as follows: 1. the graphite cathode material of the present invention and the hard charcoal precursor of independent resin-coated class or pitch class soft charcoal precursor and Chinese patent CN102030326A etc. compare, has obvious superiority, asphalt carbon and resin carbon are pinned at together mutually, complementation is not enough, has improved the comprehensive electrochemical properties of coated graphite.
2. the most outstanding innovative point of the present invention is with after the clad material presoma Combined Processing (melt, mix, solidify, coarse crushing, ultra-fine attritioning), again coated graphite; Guaranteed the uniformity that multiple clad material presoma mixes, simultaneously without any need for solvent, environmentally friendly; In addition, technique is simple, and cost is low, easily suitability for industrialized production; Other adopt the technology of liquid phase methods and Chinese patent CN102082272A etc. other adopt and solidify technology of processing and compare with Chinese patent CN101162775A etc., have outstanding creativeness and superiority.
Description of drawings
Fig. 1 is the electromicroscopic photograph (1000 times) of the modified graphite cathode material of lithium-ion power battery of the embodiment of the invention 1.
Fig. 2 is the electromicroscopic photograph (5000 times) of the modified graphite cathode material of lithium-ion power battery of the embodiment of the invention 1.
Fig. 3 is the electromicroscopic photograph (10000 times) of the modified graphite cathode material of lithium-ion power battery of the embodiment of the invention 1.
Fig. 4 is the first charge-discharge curve chart of the modified graphite cathode material of lithium-ion power battery of the embodiment of the invention 1.
Fig. 5 is the multiplying power discharging curve chart of the modified graphite cathode material of lithium-ion power battery of the embodiment of the invention 1.
Embodiment
In order to make technological means of the present invention, creation characteristic, workflow, using method reach purpose and effect is easy to understand, below further set forth the present invention.
Further illustrate as an example of natural spherical plumbago example, but these examples do not comprise or limit the full content of inventive concept.The average grain diameter D50 of natural spherical plumbago is 17.14 μ m, and tap density is 1.09g/cm
3, specific area is 6.5m
2/ g).
Embodiment 1
With mesophase pitch (250 ℃ of softening points) and phenolic resins (110 ℃ of softening points) according to 1:3(35Kg and 105Kg) ratio join together in the kneading still of 200L, begin to heat up and be heated to 300 ℃, after pitch and resin all are fused into liquid, begin to stir, and keep begin after 2 hours the cooling, after cooling, obtain compound coating material block; After compound coating material block body and function Ordinary pulverization machine carried out coarse crushing, adopt airslide disintegrating mill to carry out ultra-fine grinding, obtaining average grain diameter D50 is the compound coating material superfine powder of 2.1 μ m again; Again compound coating material superfine powder is mixed according to the ratio of 1:9 with natural spherical plumbago, the powder that mixes is warming up to 1100 ℃ with the speed of 5 ℃/min, be incubated 1 hour, then be cooled to room temperature, obtain modified graphite cathode material of lithium-ion power battery of the present invention through screening.
Accompanying drawing 1～3 is the electromicroscopic photograph of this modified graphite cathode material of lithium-ion power battery under different amplification, can find out from electromicroscopic photograph, and graphite has the coating skin that one deck mutual intersection clearly is superimposed outward.
Embodiment 2
With mesophase pitch (250 ℃ of softening points) and phenolic resins (110 ℃ of softening points) according to 1:4(30Kg and 120Kg) ratio join together in the kneading still of 200L, begin to heat up and be heated to 300 ℃, after pitch and resin all are fused into liquid, begin to stir, and keep begin after 2 hours the cooling, after cooling, obtain compound coating material block; After compound coating material block body and function Ordinary pulverization machine carried out coarse crushing, adopt airslide disintegrating mill to carry out ultra-fine grinding, obtaining average grain diameter D50 is the compound coating material superfine powder of 2.1 μ m again.Again compound coating material superfine powder is mixed according to the ratio of 1:10 with natural spherical plumbago, the powder that mixes is warming up to 1100 ℃ with the speed of 5 ℃/min, be incubated 1 hour, then be cooled to room temperature, obtain modified graphite cathode material of lithium-ion power battery of the present invention through screening.
Embodiment 3
With coal tar pitch (120 ℃ of softening points) and phenolic resins (110 ℃ of softening points) according to 1:3(35Kg and 105Kg) ratio join together in the kneading still of 200L, begin to heat up and be heated to 150 ℃, after pitch and resin all are fused into liquid, begin to stir, and keep begin after 2 hours the cooling, after cooling, obtain compound coating material block; After compound coating material block body and function Ordinary pulverization machine carried out coarse crushing, adopt the deep cooling crush machine to carry out ultra-fine grinding, obtaining average grain diameter D50 is the compound coating material superfine powder of 2.1 μ m again; Again compound coating material superfine powder is mixed according to the ratio of 1:9 with natural spherical plumbago, the powder that mixes is warming up to 1100 ℃ with the speed of 5 ℃/min, be incubated 1 hour, then be cooled to room temperature, obtain modified graphite cathode material of lithium-ion power battery of the present invention through screening.
Comparative Examples 1
Adopt airslide disintegrating mill to carry out ultra-fine grinding mesophase pitch (250 ℃ of softening points), obtaining average grain diameter D50 is the pitch-coating material superfine powder of 2.1 μ m; Again pitch-coating material superfine powder is mixed according to the ratio of 1:9 with natural spherical plumbago, the powder that mixes is warming up to 1100 ℃ with the speed of 10 ℃/min, be incubated 1 hour, then be cooled to room temperature, obtain the graphite cathode material of pitch-coating through screening.
Comparative Examples 2
Adopt the deep cooling crush machine to carry out ultra-fine grinding in phenolic resins (110 ℃ of softening points), obtaining average grain diameter D50 is the resin-coating material superfine powder of 2.1 μ m.Again resin-coating material superfine powder is mixed according to the ratio of 1:9 with natural spherical plumbago, the powder that mixes is warming up to 1100 ℃ with the speed of 5 ℃/min, be incubated 1 hour, then be cooled to room temperature, obtain the graphite cathode material of resin-coating through screening.
Comparative Examples 3
The natural spherical plumbago that does not coat directly carries out electric performance test.
Electrochemical property test
Performance for the modified graphite cathode material of lithium-ion power battery of check the inventive method preparation, test with the half-cell method of testing, negative material with above embodiment and comparative example: acetylene black: the PVDF(Kynoar)=the 93:3:4(weight ratio), add an amount of NMP(N-methyl pyrrolidone) the furnishing pulpous state, coat on the Copper Foil, made negative plate in 8 hours through 110 ℃ of dryings of vacuum; Take metal lithium sheet as to electrode, electrolyte is 1mol/L LiPF
6/ EC+DEC+DMC=1:1:1, microporous polypropylene membrane is barrier film, is assembled into battery.Charging/discharging voltage is 0～2.0V, and charge-discharge velocity is 0.2C, and battery performance is carried out and can test, and test result sees Table 1.
Table 1 be negative material in different embodiment and the comparative example Performance Ratio
In order to detect negative material of the present invention at the high rate performance aspect the electrokinetic cell, employing is prepared into 18650 type cylinder finished product batteries and carries out the detection of rate charge-discharge.
Use the negative material of embodiment and comparative example: SP:SBR(solid content 50%): the CMC=94:2.5:1.5:2(weight ratio), add appropriate amount of deionized water and mix the furnishing pulpous state, be applied on the Copper Foil, under 90 ℃, vacuumize drying; With LiFePO
4Powder: the SP:KS-6:PVDF=92:3.5:2:2.5(weight ratio), after doing solvent and evenly size mixing with NMP, be applied on the aluminium foil, under 100 ℃, vacuumize drying; With the roll-in of dried positive and negative electrode pole piece process, cut-parts, coiling, fluid injection, sealing, formation process, make LiFePO4 power type 18650 cylindrical batteries, barrier film is Celgard2400, electrolyte is 1M LiPF6 ∕ DMC:EC:DEC, use powered cell detection device to carry out the detection of high rate performance, test result sees Table 2.
Table 2 is that the high rate performance of negative material in different embodiment and the comparative example compares
Above demonstration and described basic principle of the present invention, principal character and advantage of the present invention.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; that describes in above-described embodiment and the specification just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (6)
1. the preparation method of a modified graphite cathode material of lithium-ion power battery, it is characterized in that: concrete steps are as follows:
(1) preparation compound coating material block: pitch and resin are joined in the kneading still with heating and agitating device for 1:1.5～4 by weight, be heated to pitch and resin and all be fused into liquid, then constantly stir, mix rear stopped heating, cooling obtains compound coating material block;
(2) preparation compound coating material superfine powder: after the compound coating material block of step (1) preparation carried out coarse crushing, carry out ultra-fine grinding by airslide disintegrating mill or deep cooling crush machine again, obtain the compound coating material superfine powder of particle diameter below 6 μ m;
(3) mix: compound coating material superfine powder and graphite that step (2) is prepared are that 5～20:100 fully is mixed to get uniformed powder by weight;
(4) heat treatment: with step (3) uniformed powder under the protection of inert gas; speed with 1～20 ℃/min is warming up to 600～1300 ℃; be incubated 0.5～5h, cooling is sieved after the cooling and is namely obtained modified graphite cathode material of lithium-ion power battery naturally again.
2. the preparation method of a kind of modified graphite cathode material of lithium-ion power battery according to claim 1, it is characterized in that: the mixture of one or more in the condensation polycyclic polynuclear aromatic hydrocarbon that described pitch comprises coal tar pitch, petroleum asphalt, modified coal tar pitch, mesophase pitch, obtained by asphalt modifier, softening point is more than 100 ℃.
3. the preparation method of a kind of modified graphite cathode material of lithium-ion power battery according to claim 1, it is characterized in that: described resin is thermoplastic resin, comprises one or more the mixture in furane resins, Lauxite, ethyl-amine resin, phenolic resins, epoxy resin and the polyformaldehyde methyl acrylate resin.
4. the preparation method of a kind of modified graphite cathode material of lithium-ion power battery according to claim 1, it is characterized in that: the particle diameter of described compound coating material superfine powder is below 3 μ m.
5. the preparation method of a kind of modified graphite cathode material of lithium-ion power battery according to claim 1, it is characterized in that: described graphite is native graphite or Delanium, average grain diameter is 5～50 μ m, tap density 〉=0.7g/cm
3, specific area≤7m
2/ g.
6. the preparation method of a kind of modified graphite cathode material of lithium-ion power battery according to claim 1, it is characterized in that: described inert gas is N
2Or Ar.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105410709A CN103035919A (en) | 2012-12-14 | 2012-12-14 | Method for preparing modified graphite negative electrode material of lithium ion power battery |
| CN201310624586.4A CN103626170A (en) | 2012-12-14 | 2013-11-29 | Method for preparing modified graphite cathode material |
| CN201310631187.0A CN103594691A (en) | 2012-12-14 | 2013-12-02 | Preparation method of high-volume silicon-carbon negative electrode material |
| CN201310642092.9A CN103618073A (en) | 2012-12-14 | 2013-12-05 | Preparation method for silicon-carbon composite cathode material |
| CN201310661597.XA CN103606681A (en) | 2012-12-14 | 2013-12-10 | Preparation method of composite material of coating layer of lithium ion battery cathode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105410709A CN103035919A (en) | 2012-12-14 | 2012-12-14 | Method for preparing modified graphite negative electrode material of lithium ion power battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103035919A true CN103035919A (en) | 2013-04-10 |
Family
ID=48022579
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012105410709A Pending CN103035919A (en) | 2012-12-14 | 2012-12-14 | Method for preparing modified graphite negative electrode material of lithium ion power battery |
| CN201310624586.4A Pending CN103626170A (en) | 2012-12-14 | 2013-11-29 | Method for preparing modified graphite cathode material |
| CN201310631187.0A Pending CN103594691A (en) | 2012-12-14 | 2013-12-02 | Preparation method of high-volume silicon-carbon negative electrode material |
| CN201310642092.9A Pending CN103618073A (en) | 2012-12-14 | 2013-12-05 | Preparation method for silicon-carbon composite cathode material |
| CN201310661597.XA Pending CN103606681A (en) | 2012-12-14 | 2013-12-10 | Preparation method of composite material of coating layer of lithium ion battery cathode |
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| CN201310624586.4A Pending CN103626170A (en) | 2012-12-14 | 2013-11-29 | Method for preparing modified graphite cathode material |
| CN201310631187.0A Pending CN103594691A (en) | 2012-12-14 | 2013-12-02 | Preparation method of high-volume silicon-carbon negative electrode material |
| CN201310642092.9A Pending CN103618073A (en) | 2012-12-14 | 2013-12-05 | Preparation method for silicon-carbon composite cathode material |
| CN201310661597.XA Pending CN103606681A (en) | 2012-12-14 | 2013-12-10 | Preparation method of composite material of coating layer of lithium ion battery cathode |
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| CN103626170A (en) | 2014-03-12 |
| CN103618073A (en) | 2014-03-05 |
| CN103606681A (en) | 2014-02-26 |
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