CN1194431C - Prepn of composite negative-pole graphite material for lithium ion battery, negative pole and battery - Google Patents
Prepn of composite negative-pole graphite material for lithium ion battery, negative pole and battery Download PDFInfo
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- CN1194431C CN1194431C CNB021591660A CN02159166A CN1194431C CN 1194431 C CN1194431 C CN 1194431C CN B021591660 A CNB021591660 A CN B021591660A CN 02159166 A CN02159166 A CN 02159166A CN 1194431 C CN1194431 C CN 1194431C
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- lithium
- negative electrode
- ion battery
- lithium ion
- graphite
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 22
- 239000002131 composite material Substances 0.000 title claims description 27
- 239000007770 graphite material Substances 0.000 title description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 57
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 41
- 239000010439 graphite Substances 0.000 claims abstract description 41
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 19
- 239000007773 negative electrode material Substances 0.000 claims abstract description 19
- 238000002360 preparation method Methods 0.000 claims abstract description 11
- 239000000243 solution Substances 0.000 claims abstract description 11
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims abstract description 9
- 239000010452 phosphate Substances 0.000 claims abstract description 9
- -1 polypropylene Polymers 0.000 claims abstract description 9
- 229910000314 transition metal oxide Inorganic materials 0.000 claims abstract description 7
- 229910003002 lithium salt Inorganic materials 0.000 claims abstract description 5
- 159000000002 lithium salts Chemical class 0.000 claims abstract description 5
- 239000012046 mixed solvent Substances 0.000 claims abstract description 5
- 239000004743 Polypropylene Substances 0.000 claims abstract description 4
- 229920001155 polypropylene Polymers 0.000 claims abstract description 4
- 229910000319 transition metal phosphate Inorganic materials 0.000 claims abstract description 3
- 229910052744 lithium Inorganic materials 0.000 claims description 18
- 239000000463 material Substances 0.000 claims description 14
- 239000003792 electrolyte Substances 0.000 claims description 13
- 238000003756 stirring Methods 0.000 claims description 12
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical class [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 11
- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 claims description 10
- 238000005303 weighing Methods 0.000 claims description 8
- 239000000853 adhesive Substances 0.000 claims description 7
- 230000001070 adhesive effect Effects 0.000 claims description 7
- 239000006258 conductive agent Substances 0.000 claims description 7
- 229910019142 PO4 Inorganic materials 0.000 claims description 6
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 6
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 claims description 5
- 230000004888 barrier function Effects 0.000 claims description 5
- 229910021626 Tin(II) chloride Inorganic materials 0.000 claims description 4
- 239000006229 carbon black Substances 0.000 claims description 4
- 239000012065 filter cake Substances 0.000 claims description 4
- 239000012982 microporous membrane Substances 0.000 claims description 4
- 229920000642 polymer Polymers 0.000 claims description 4
- 150000003839 salts Chemical class 0.000 claims description 4
- 238000005406 washing Methods 0.000 claims description 4
- 229910010707 LiFePO 4 Inorganic materials 0.000 claims description 3
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- QGHDLJAZIIFENW-UHFFFAOYSA-N 4-[1,1,1,3,3,3-hexafluoro-2-(4-hydroxy-3-prop-2-enylphenyl)propan-2-yl]-2-prop-2-enylphenol Chemical group C1=C(CC=C)C(O)=CC=C1C(C(F)(F)F)(C(F)(F)F)C1=CC=C(O)C(CC=C)=C1 QGHDLJAZIIFENW-UHFFFAOYSA-N 0.000 claims description 2
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 claims description 2
- 229910002097 Lithium manganese(III,IV) oxide Inorganic materials 0.000 claims description 2
- 239000002253 acid Substances 0.000 claims description 2
- 239000003513 alkali Substances 0.000 claims description 2
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 claims description 2
- 229910017052 cobalt Inorganic materials 0.000 claims description 2
- 239000010941 cobalt Substances 0.000 claims description 2
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 claims description 2
- 239000004816 latex Substances 0.000 claims description 2
- 229920000126 latex Polymers 0.000 claims description 2
- MHCFAGZWMAWTNR-UHFFFAOYSA-M lithium perchlorate Chemical group [Li+].[O-]Cl(=O)(=O)=O MHCFAGZWMAWTNR-UHFFFAOYSA-M 0.000 claims description 2
- 229910001486 lithium perchlorate Inorganic materials 0.000 claims description 2
- 239000003960 organic solvent Substances 0.000 claims description 2
- 238000001556 precipitation Methods 0.000 claims description 2
- 239000000376 reactant Substances 0.000 claims description 2
- 239000012266 salt solution Substances 0.000 claims description 2
- 229910001432 tin ion Inorganic materials 0.000 claims description 2
- IUTCEZPPWBHGIX-UHFFFAOYSA-N tin(2+) Chemical compound [Sn+2] IUTCEZPPWBHGIX-UHFFFAOYSA-N 0.000 claims description 2
- 239000007774 positive electrode material Substances 0.000 claims 1
- 229910044991 metal oxide Inorganic materials 0.000 abstract description 5
- 150000004706 metal oxides Chemical class 0.000 abstract description 5
- 150000001875 compounds Chemical class 0.000 abstract 4
- 239000003795 chemical substances by application Substances 0.000 abstract 2
- 239000008151 electrolyte solution Substances 0.000 abstract 2
- 239000012528 membrane Substances 0.000 abstract 2
- 239000013543 active substance Substances 0.000 abstract 1
- 230000005611 electricity Effects 0.000 abstract 1
- 239000002391 graphite-based active material Substances 0.000 abstract 1
- 229910052799 carbon Inorganic materials 0.000 description 10
- 230000002441 reversible effect Effects 0.000 description 10
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000002388 carbon-based active material Substances 0.000 description 2
- 239000012153 distilled water Substances 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 230000002427 irreversible effect Effects 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 235000011150 stannous chloride Nutrition 0.000 description 2
- 229910013684 LiClO 4 Inorganic materials 0.000 description 1
- 229910012851 LiCoO 2 Inorganic materials 0.000 description 1
- 229910013870 LiPF 6 Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000005486 organic electrolyte Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
Images
Classifications
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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
- 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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- Battery Electrode And Active Subsutance (AREA)
Abstract
The present invention relates to a negative electrode material of a lithium ion battery, particularly to a method for preparing a compound graphite active material of a negative electrode, a negative electrode and a lithium ion battery using the negative electrode material. A certain amount of metal oxide is compounded with a graphite surface by a solution method; then, the compound graphite is dried under definite temperature, so a graphite negative electrode material with which metal oxide is covered is obtained. The method has the advantages of simple and safe preparation condition, and low cost; the compound graphite has the advantages of high specific capacity, good compatibility of electrolytic solution and good circulating performance. The prepared compound graphite, a conducting agent and a cementing agent are mixed to prepare a negative electrode which has high reversibility; a lithium ion battery is prepared by the steps that litium transition metal oxide or phosphate is embedded in the negative electrode, so a positive electrode is formed; lithium salt which is dissolved in organic mixed solvent is used as electrolytic solution; a polypropylene porous membrane is used as a membrane; the litium emebedding specific capacity of the active substance of the negative electrode is greater than 340mAh. g<-1>. The battery is widely applied and is suitable for the application to various electricity utilization fields.
Description
Technical field: the present invention relates to a kind of lithium ion battery negative material, particularly a kind of preparation method of composite graphite negative electrode active material, and the negative pole and the lithium ion battery that adopt this negative material.
Background technology: since coming out from lithium ion battery, its negative material is a numerous researcher institute extensive concern as the focus of investigation of materials always.Present research mainly concentrates on material with carbon element and some metal oxide aspects.Aspect material with carbon element, because graphite is with its good voltage platform, higher specific capacity, the advantage of particularly high aspects such as the ratio of performance to price is paid close attention to by the lithium ion battery industrial circle, but, because a little less than the graphite layers active force, relatively poor with the electrolyte compatibility, solvent molecule can take place in charge and discharge process enter graphite linings, thereby cause surface layer peeling, electrolyte continues and new top layer reaction, cause the cycle performance of graphite relatively poor, therefore, use graphite as lithium ion battery negative material, its performance has certain limitation, and generally will pass through suitable processing could be as lithium ion battery negative material.
And in general, metal oxide is stable higher to organic electrolyte, but its electric conductivity is relatively poor, can only improve its current capability by the particle diameter that reduces material, so irreversible capacity is bigger, discharge platform is bad, oxide reversible capacity as the tin of employing CVD methods such as Hironori preparations reaches 600mAh/g, but irreversible capacity is also very big, reaches 800mAh/g[J.Power Sources, 2001,97-98:229], so these shortcomings have also limited practical application [J.Chouvin, the J.Power Sources of metal oxide in lithium ion battery, 1999,81-82:277].
Summary of the invention: the oxide that the objective of the invention is to coat a small amount of tin at graphite surface, the advantage of comprehensive utilization graphite and tin type oxide, overcome their shortcomings separately simultaneously, thereby prepare a kind of well behaved composite graphite negative electrode material, it has higher reversible embedding lithium specific capacity and good and compatibility electrolyte, and further to provide a kind of be the lithium ion battery of negative pole with this composite graphite, wherein, composite graphite negative electrode material by a kind of simple method of modifying make, cost is low.
The preparation method of composite graphite negative electrode material for lithium cell of the present invention, its step comprises:
1) preparation tin ion or stannous ion concentration are pink salt or the tin salt solution of 0.001-1mol/L, stir in reactor, and the covering amount of the concentration decision final oxide of solution is at 0.01-10%;
2) take by weighing the graphite powder of respective amount according to the ratio that adds the 0.01-10kg graphite powder in every liter of solution, join in the reactor constant temperature 20-80 degree centigrade stirring;
3) in reactor, drip aqueous slkali,, when the solution pH value is 3-10, stop to drip aqueous slkali, continue to stir 1-5 hour so that form the precipitation of hydroxide of tin;
4) reactant is filtered, washing is to there not being Cl
-
5) with the filter cake oven dry, promptly get composite graphite negative electrode material of the present invention.
Described pink salt is SnCl
2, or tin salt is SnCl
4Described alkali is selected from LiOH, NaOH, KOH etc.
Adopt the lithium ion battery negative of the material of method for preparing, comprise composite graphite negative electrode material, conductive agent and adhesive, the weight ratio of composite graphite negative electrode material, conductive agent and adhesive is followed successively by: 74-99.4%:0.5-16%:0.1-10%.
Wherein conductive agent is selected from graphite or carbon black, perhaps their mixture, and its mixed weight is followed successively by (1-2): (2-3); Adhesive is selected from polytetrafluoroethylene or Kynoar or butadiene-styrene latex derivative.
Adopt the lithium ion battery of above-mentioned negative pole, comprise negative pole, positive pole, electrolyte and barrier film, anodal transition metal oxide or phosphate by the embedding lithium constitutes; Electrolyte is that concentration is organic mixed solvent solution of one mole every liter lithium salts; Barrier film is the high molecular polymer microporous membrane.
The transition metal oxide of described embedding lithium or phosphate are selected from the transition metal oxide of embedding lithiums such as cobalt acid lithium, lithium nickelate, LiMn2O4, and phosphate positive electrode such as LiFePO 4.
The lithium salts of described electrolyte is selected from lithium perchlorate, lithium hexafluoro phosphate; Organic solvent is selected from ethylene carbonate, diethyl carbonate, dimethyl carbonate, two kinds of combinations in them, and volume ratio is (1: 9)-(9: 1), or their combinations of three kinds, volume ratio is 1: 1: 1.
Described high molecular polymer microporous membrane is a polypropylene microporous film.
As above structure is assembled into the battery of various models with above-listed each material according to its functional requirement, and battery is after charging, and lithium ion embeds negative pole, but form working battery, discharge and recharge the mensuration material capacity continuously, in the weight of negative electrode active material, the reversible specific capacity of gained battery is greater than 340mAhg
-1, good cyclicity is arranged.
The present invention is by coating the oxide of a small amount of tin at graphite surface, the advantage of comprehensive utilization graphite and tin type oxide, overcome their shortcomings separately simultaneously, thereby obtain a kind of well behaved composite graphite negative electrode material, it has higher reversible embedding lithium specific capacity and good and compatibility electrolyte, and further to provide a kind of be the lithium ion battery of negative pole with this composite graphite, wherein, composite graphite negative electrode material by a kind of simple method of modifying make, cost is low.
Advantage of the present invention is:
(1). preparation composite graphite method is simple, fail safe good, cost is low;
(2). prepared composite graphite and conductive agent, adhesive are mixed and made into the carbon negative pole, have high reversibility;
(3). prepared composite graphite reversible specific capacity is greater than 340mAhg
-1, good with the electrolyte compatibility, good cyclicity is arranged.
Such battery use is extensive, comprising: be used for mobile phone, notebook computer, video camera, electric bicycle, electric automobile, electronic toy etc., because of it can be made into the different shape that varies in size, be applicable to and variously use with electrical domain.
Description of drawings:
Cycle performance of battery figure
053448 type battery, (25 ℃) charge and discharge by the 1C multiplying power under the normal temperature.
Embodiment:
In order to be illustrated more clearly in the present invention, enumerate following examples, but it there is not any restriction to the present invention.
Embodiment 1
Take by weighing 25 gram stannous chlorides, be dissolved in the concentrated hydrochloric acid, and be diluted to 1 liter, in reactor, stir.Take by weighing 1 kilogram of graphite powder again, join in the reactor, stir, slowly drip lithium hydroxide solution simultaneously in reactor, terminal point pH is about 8.Dropwise, continue to stir 2 hours, filter then, with running water washing 3 times, distilled water is washed till nothing
Cl-,, obtain composite graphite with the filter cake oven dry.
The gained composite graphite prepares electrode as follows.
Take by weighing 10 gram composite graphites, add 1 gram carbon black, 1 gram polytetrafluoroethylene after the grinding evenly, is made electrode, with LiCoO
2Be positive pole, be dissolved in the 1.0molL in ethyl carbonate+diethyl carbonate (volume ratio 1: 1) mixed solvent
-1LiClO
4Be electrolyte, polypropylene microporous film is a barrier film, is assembled into the model battery, charges to 4.2 volts by the speed of 25mA/ (gram carbon), is discharged to 2.7 volts, and the reversible specific capacity that records the carbon active material is 345mAhg
-1
With undressed graphite raw material composition model battery as stated above, be 315mAhg by the reversible specific capacity that records the carbon active material with quadrat method
-1
Embodiment 2
Take by weighing 35 gram stannous chlorides, be dissolved in the concentrated hydrochloric acid, and be diluted to 1 liter, in reactor, stir.Take by weighing 1 kilogram of graphite powder again, join in the reactor, stir, slowly drip lithium hydroxide solution simultaneously in reactor, terminal point pH is about 8.Dropwise, continue to stir 2 hours, filter then, with running water washing 3 times, distilled water is washed till no Cl
-,, obtain composite graphite with the filter cake oven dry.Measuring reversible specific capacity after gained carbon sample prepares electrode slice and is assembled into battery by the method for example 1 is 350mAhg
-1
Embodiment 3
Method by example 1 prepares the composite graphite material, prepares carbon electrode by following method: take by weighing 10 gram carbon, add 1 gram carbon black, 1 gram Kynoar after the grinding evenly, is made electrode.After being assembled into 053448 battery by the method for example 1, adopt the electric current of 1C multiplying power to carry out charge and discharge cycles, 20 capacity that circulate remain unchanged (seeing Figure of description).
Undressed graphite raw material is assembled 053448 battery as stated above, carry out charge and discharge cycles by this example with quadrat method, the capacity after 20 times of circulating only remains 94% of capacity first.
Embodiment 4
Method by example 1 prepares material with carbon element and carbon electrode, with the 1.0molL that is dissolved in ethyl carbonate+dimethyl carbonate (volume ratio 1: 1) mixed solvent
-1LiPF
6Be electrolyte, measuring reversible specific capacity by the method for example 1 is 346mAhg
-1
Method by example 1 prepares composite graphite material and carbon electrode, the anodal LiFePO 4 that adopts, and measuring reversible specific capacity according to the method assembled battery of embodiment 1 is 348mAhg
-1
Claims (8)
1, a kind of preparation method of composite graphite negative electrode material for lithium cell, its step comprises:
1) preparation tin ion or stannous ion concentration are pink salt or the tin salt solution of 0.001-1mol/L, stir in reactor, and the covering amount of the concentration decision final oxide of solution is at 0.01-10%;
2) take by weighing the graphite powder of respective amount according to the ratio that adds the 0.1-10kg graphite powder in every liter of solution, join in the reactor, constant temperature 20 degree～80 degree stir;
3) in reactor, drip aqueous slkali,, when the pH value of solution value is 3-10, stop to drip aqueous slkali, continue to stir 1-5 hour so that form the precipitation of hydroxide of tin;
4) reactant is filtered, washing is to there not being Cl
-
5) with the filter cake oven dry, promptly get composite graphite negative electrode material.
2, the preparation method of composite graphite negative electrode material for lithium cell as claimed in claim 1 is characterized in that described pink salt is SnCl
2, or tin salt is SnCl
4Described alkali is selected from LiOH, NaOH, KOH.
3, adopt the lithium ion battery negative of the material of method preparation according to claim 1, comprise composite graphite negative electrode material, conductive agent and adhesive, it is characterized in that the weight ratio of composite graphite negative electrode material, conductive agent and adhesive is followed successively by: 74-99.4%: 0.5-16%: 0.1-10%.
4, lithium ion battery negative as claimed in claim 3 is characterized in that conductive agent is selected from graphite or carbon black, perhaps their mixture, and its mixed weight is followed successively by 1-2: 2-3; Adhesive is selected from polytetrafluoroethylene or Kynoar or butadiene-styrene latex derivative.
5, adopt lithium ion battery, comprise negative pole as negative pole as described in the claim 3, positive pole, electrolyte and barrier film is characterized in that
Anodal transition metal oxide or phosphate by the embedding lithium constitutes;
Electrolyte is that concentration is organic mixed solvent solution of one mole every liter lithium salts;
Barrier film is the high molecular polymer microporous membrane.
6, lithium ion battery as claimed in claim 5 is characterized in that the transition metal oxide of described embedding lithium or the transition metal oxide that phosphate is selected from the embedding lithium: cobalt acid lithium, lithium nickelate, LiMn2O4, and phosphate positive electrode material LiFePO 4 of lithium.
7, lithium ion battery as claimed in claim 5 is characterized in that the lithium salts of described electrolyte is selected from lithium perchlorate, lithium hexafluoro phosphate; Organic solvent is selected from wherein a kind of of ethylene carbonate, diethyl carbonate, dimethyl carbonate; Or two kinds combination, volume ratio is 1: 9 to 9: 1; Or three kinds combination, volume ratio is 1: 1: 1.
8, lithium ion battery as claimed in claim 5 is characterized in that the high molecular polymer microporous membrane is a polypropylene microporous film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021591660A CN1194431C (en) | 2002-12-30 | 2002-12-30 | Prepn of composite negative-pole graphite material for lithium ion battery, negative pole and battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021591660A CN1194431C (en) | 2002-12-30 | 2002-12-30 | Prepn of composite negative-pole graphite material for lithium ion battery, negative pole and battery |
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| CN1417876A CN1417876A (en) | 2003-05-14 |
| CN1194431C true CN1194431C (en) | 2005-03-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012022256A1 (en) * | 2010-08-19 | 2012-02-23 | Byd Company Limited | Method for preparing negative active material, negative electrode material and lithium ion battery |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012022256A1 (en) * | 2010-08-19 | 2012-02-23 | Byd Company Limited | Method for preparing negative active material, negative electrode material and lithium ion battery |
| US9601753B2 (en) | 2010-08-19 | 2017-03-21 | Byd Company Limited | Negative active materials, lithium ion batteries, and methods thereof |
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| CN1417876A (en) | 2003-05-14 |
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