CN1328350A - Process for preparing negative electrode material of lithium ion battery and its negative electrode and battery - Google Patents
Process for preparing negative electrode material of lithium ion battery and its negative electrode and battery Download PDFInfo
- Publication number
- CN1328350A CN1328350A CN01123430A CN01123430A CN1328350A CN 1328350 A CN1328350 A CN 1328350A CN 01123430 A CN01123430 A CN 01123430A CN 01123430 A CN01123430 A CN 01123430A CN 1328350 A CN1328350 A CN 1328350A
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- Prior art keywords
- lithium
- lithium battery
- coated graphite
- graphite
- cathode
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 229910001416 lithium ion Inorganic materials 0.000 title abstract description 11
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title abstract description 10
- 239000007773 negative electrode material Substances 0.000 title abstract 2
- 238000004519 manufacturing process Methods 0.000 title 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 52
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 39
- 239000010439 graphite Substances 0.000 claims abstract description 39
- 239000003792 electrolyte Substances 0.000 claims abstract description 13
- -1 polypropylene Polymers 0.000 claims abstract description 11
- 229920001577 copolymer Polymers 0.000 claims abstract description 9
- 229910003002 lithium salt Inorganic materials 0.000 claims abstract description 5
- 159000000002 lithium salts Chemical class 0.000 claims abstract description 5
- 239000003960 organic solvent Substances 0.000 claims abstract description 5
- 229910000314 transition metal oxide Inorganic materials 0.000 claims abstract description 5
- 239000004743 Polypropylene Substances 0.000 claims abstract description 4
- 229920001155 polypropylene Polymers 0.000 claims abstract description 4
- 238000000197 pyrolysis Methods 0.000 claims abstract description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 26
- 229910052744 lithium Inorganic materials 0.000 claims description 26
- 239000000463 material Substances 0.000 claims description 13
- 239000006229 carbon black Substances 0.000 claims description 10
- 238000002360 preparation method Methods 0.000 claims description 9
- 239000000853 adhesive Substances 0.000 claims description 8
- 230000001070 adhesive effect Effects 0.000 claims description 8
- 239000006258 conductive agent Substances 0.000 claims description 8
- OIFBSDVPJOWBCH-UHFFFAOYSA-N Diethyl carbonate Chemical compound CCOC(=O)OCC OIFBSDVPJOWBCH-UHFFFAOYSA-N 0.000 claims description 7
- 230000004888 barrier function Effects 0.000 claims description 7
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 7
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 7
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical group O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 claims description 6
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 claims description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 4
- 239000011261 inert gas Substances 0.000 claims description 4
- MHCFAGZWMAWTNR-UHFFFAOYSA-M lithium perchlorate Chemical compound [Li+].[O-]Cl(=O)(=O)=O MHCFAGZWMAWTNR-UHFFFAOYSA-M 0.000 claims description 4
- 229910001486 lithium perchlorate Inorganic materials 0.000 claims description 4
- 239000012046 mixed solvent Substances 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 229910002097 Lithium manganese(III,IV) oxide Inorganic materials 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
- 229910019142 PO4 Inorganic materials 0.000 claims description 2
- 239000002253 acid Substances 0.000 claims description 2
- 229910052786 argon Inorganic materials 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 group [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 claims description 2
- 239000007789 gas Substances 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims description 2
- 239000012982 microporous membrane Substances 0.000 claims description 2
- 239000011259 mixed solution Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims description 2
- 239000010452 phosphate Substances 0.000 claims description 2
- 229920000642 polymer Polymers 0.000 claims description 2
- 239000000243 solution Substances 0.000 claims description 2
- 230000008901 benefit Effects 0.000 abstract description 3
- 239000011248 coating agent Substances 0.000 abstract description 3
- 238000000576 coating method Methods 0.000 abstract description 3
- 239000012299 nitrogen atmosphere Substances 0.000 abstract description 3
- 239000012528 membrane Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 13
- 229910052799 carbon Inorganic materials 0.000 description 12
- 230000002441 reversible effect Effects 0.000 description 7
- 239000010410 layer Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 229910012851 LiCoO 2 Inorganic materials 0.000 description 1
- 229910013872 LiPF Inorganic materials 0.000 description 1
- 101150058243 Lipf gene Proteins 0.000 description 1
- 239000002388 carbon-based active material Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000002050 diffraction method Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 150000008040 ionic compounds Chemical class 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
Classifications
-
- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Battery Electrode And Active Subsutance (AREA)
- Secondary Cells (AREA)
Abstract
A negative electrode material for lithium ion battery is prepared through coating graphite with benzene-naphthalene copolymer, and pyrolysis in N2 atmosphere. A Li-ion battery is composed of said negative electrode, Li-embedded transition metal oxide as positive electrode, electrolyte (lithium salt dissolved in mixed organic solvent), and porous polypropylene membrane as diagphram. Its advantages are high safety, low cost, high specific capacity and better cycle performance.
Description
Technical field: the present invention relates to a kind of lithium ion battery, relate in particular to a kind of preparation of lithium ion battery negative material coated graphite, and adopt the negative pole of this coated graphite and the lithium ion battery of this negative pole of employing.
Background technology: since coming out from lithium ion battery, its negative material is always as the focus of investigation of materials.Present research mainly concentrates on material with carbon element and some metal oxide aspects, though people constantly work out the novel negative material of some height ratio capacities, but from commercial angle, coke and graphite have very big advantage aspect cost performance, comparatively speaking, graphite is paid close attention to by industrial circle with its good voltage platform and higher specific capacity.
Graphite has high degree of crystallinity, and lithium intercalated graphite belongs to the ionic compound between graphite layers, and its single order compound molecule formula is LiC
6, theoretical capacity is 372mAh.g
-1(372 Milliampere Hour/gram), the embedding of lithium with take off embedding reaction and occur in the 0-0.25 volt (with respect to Li/Li
+), have good voltage platform.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, as lithium ion battery negative material, its performance has certain limitation with graphite.Therefore, people carry out structural modification by the whole bag of tricks to graphite, promptly with physics or chemical method modified graphite, thereby improve its chemical property.Wu, Y.P. wait and use the method that graphite is carried out oxidation to improve its performance (E.Electrochem.Commun.2000,2,272), Tsumura, (Solid State Ionics2000,135,209) and Yoshio such as T., (J.ofthe Electrochemical Soc.2000 such as M., 147,1245) with the method that coats graphite is carried out modification, but it also has certain distance apart from practicability.
Summary of the invention: the purpose of this invention is to provide a kind of preparation method of coated graphite, overcome that graphite easily comes off, the cyclicity difference, stablize the not high shortcoming of capacity, improve its reversible embedding lithium specific capacity and with the compatibility of electrolyte.
The present invention also aims to provide more than one to state coated graphite is the negative pole of material and the lithium ion battery that comprises this negative pole.
The preparation method of cathode of lithium battery coated graphite of the present invention, its step comprises
1) synthetic benzene naphthalene copolymer and graphite are mixed, on mixer, mixed 1～5 hour;
2) material after will mixing is put into pyrolysis oven, is 1～5 liter/minute inert gas flow at flow velocity
Heat treated in the protection, heating rate are 1～20 ℃ of per minute;
3) kept 0.5～48 hour at 600-900 ℃, reduce to 25 ℃ of room temperatures then.
The shared ratio of above-mentioned benzene naphthalene copolymer is 0.1-99.9%.Inert gas is nitrogen or argon gas.
Cathode of lithium battery of the present invention comprises coated graphite, conductive agent and adhesive, and their weight ratio is followed successively by: 99.4-74%:0.5-16%:0.1-10%.
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.
When conductive agent is a carbon black, adhesive is a polytetrafluoroethylene, and coated graphite, carbon black, polytetrafluoroethylene weight ratio can be 10: 1: 1 successively.
Lithium battery of the present invention comprises negative pole, positive pole, and electrolyte, barrier film, anodal transition metal oxide by the embedding lithium constitutes, and electrolyte is that concentration is organic mixed solvent solution of one mole every liter lithium salts, and barrier film is the high molecular polymer microporous membrane.
Above-mentioned transition metal oxide is selected from cobalt acid lithium, lithium nickelate, LiMn2O4; Lithium salts is selected from lithium perchlorate, lithium hexafluoro phosphate; Organic solvent is selected from ethylene carbonate, diethyl carbonate, dimethyl carbonate; Barrier film is a polypropylene microporous film.
When above-mentioned organic solvent was two kinds of combinations, volume ratio can be (1: 9)-(9: 1), and maybe when for three kinds of combinations, volume ratio is 1: 1: 1.
Above-mentioned electrolyte is that concentration is the ethylene carbonate and the diethyl carbonate mixed solution of one mole every liter lithium perchlorate, or ethylene carbonate and dimethyl carbonate mixed liquor, and mixing ratio is 1: 1.
The negative pole of described battery comprises benzene naphthalene copolymer RESEARCH OF PYROCARBON coated graphite, carbon black and Kynoar, and their weight ratio was followed successively by 10: 1: 1.
Advantage of the present invention is:
(1). preparation coated graphite method is simple, fail safe good, cost is low;
(2). prepared coated graphite and conductive agent, adhesive are mixed and made into the carbon negative pole, have high reversibility;
(3). prepared coated graphite reversible specific capacity is greater than 330 mAhg
-1, it is good with the electrolyte compatibility,
Good cyclicity is arranged.
According to the coated graphite of the present invention's preparation, its XRD diffraction analysis shows that 2 θ increase (see figure 1) at 43 ° peak before coating;
Lithium ion battery of the present invention is of many uses, 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:
B before the graphite sample XRD figure was composed and a) coated before and after Fig. 1 coated) after the coating
Embodiment:
Embodiment 1:
18 gram native graphites and 2 gram benzene naphthalene copolymers are mixed, on batch mixer, mixed 2 hours, under 6 liters/minute nitrogen atmosphere, rise to 800 ℃, kept this temperature 1.0 hours, be cooled to 20 ℃ then with 10 ℃/minute speed.The gained RESEARCH OF PYROCARBON prepares electrode as follows.
Take by weighing 10 gram carbon, add 1 gram carbon black, 1 gram polytetrafluoroethylene after the grinding evenly, is made electrode, with LiCoO
2Be positive pole, be dissolved in 1.0 mol LiClO in ethyl carbonate+diethyl carbonate (volume ratio 1: 1) mixed solvent
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 340mAhg
-1
Embodiment 2:
15 gram Delaniums and 5 gram benzene naphthalene copolymers are mixed, on batch mixer, mixed 3 hours, under 6 liters/minute nitrogen atmosphere, rise to 900 ℃, kept this temperature 3.0 hours, be cooled to 20 ℃ then with 10 ℃/minute speed.Measuring reversible specific capacity after gained carbon sample prepares electrode slice and is assembled into battery by the method for example 1 is 355mAhg
-1
Embodiment 3:
Method by example 1 prepares material with carbon element, 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.Be assembled into by the method for example 1 that to measure reversible specific capacity behind the battery be 345mAhg
-1
Embodiment 4:
Method by example 1 prepares material with carbon element and carbon electrode, with the 1.0 mol LiPF that are dissolved in ethyl carbonate+dimethyl carbonate (volume ratio 1: 1) mixed solvent
6Be electrolyte, measuring reversible specific capacity by the method for example 1 is 343mAhg
-1
Embodiment 5:
Method by example 1 prepares material with carbon element and carbon electrode, the anodal LiMn2O4 that adopts, and measuring reversible specific capacity according to the method assembled battery of embodiment 1 is 340mAhg
-1
Claims (11)
1. the preparation method of a cathode of lithium battery coated graphite, its step comprises
1) synthetic benzene naphthalene copolymer and graphite are mixed, on mixer, mixed 1～5 hour;
2) material after will mixing is put into pyrolysis oven, is heat treated in 1～5 liter/minute the inert gas flow protection at flow velocity, and heating rate is 1～20 ℃ of a per minute;
3) kept 0.5～48 hour at 600-900 ℃, reduce to 25 ℃ of room temperatures then.
2. the preparation method of cathode of lithium battery coated graphite as claimed in claim 1 is characterized in that the shared ratio of benzene naphthalene copolymer is 0.1-99.9%.
3. the preparation method of cathode of lithium battery coated graphite as claimed in claim 1 is characterized in that inert gas is nitrogen or argon gas.
4. a cathode of lithium battery that adopts the made coated graphite of claim I comprises coated graphite, and conductive agent and adhesive is characterized in that described coated graphite, and conductive agent and adhesive weight ratio are followed successively by: 99.4-74%: 0.5-16%: 0.1-10%.
5. a cathode of lithium battery as claimed in claim 4 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.
6. a cathode of lithium battery as claimed in claim 5 is characterized in that conductive agent is a carbon black, and adhesive is a polytetrafluoroethylene, and coated graphite, carbon black, polytetrafluoroethylene weight ratio were followed successively by 10: 1: 1.
7. lithium battery that adopts the described cathode of lithium battery of claim 4, comprise negative pole, anodal, electrolyte, barrier film, it is characterized in that anodal transition metal oxide by the embedding lithium constitutes, electrolyte is that concentration is organic mixed solvent solution of one mole every liter lithium salts, and barrier film is the high molecular polymer microporous membrane.
8. a lithium battery as claimed in claim 5 is characterized in that transition metal oxide is selected from cobalt acid lithium, lithium nickelate, LiMn2O4; Lithium salts is selected from lithium perchlorate, lithium hexafluoro phosphate; Organic solvent is selected from ethylene carbonate, diethyl carbonate, dimethyl carbonate; Barrier film is a polypropylene microporous film.
9. a lithium battery as claimed in claim 8 it is characterized in that the volume ratio of two kinds of combinations of organic solvent is (1: 9)-(9: 1), or the volume ratio of three kinds of combinations is 1: 1: 1.
10. a lithium battery as claimed in claim 7 is characterized in that electrolyte is that concentration is the ethylene carbonate and the diethyl carbonate mixed solution of one mole every liter lithium perchlorate, or ethylene carbonate and dimethyl carbonate mixed liquor, and mixing ratio is 1: 1.
11. a lithium battery as claimed in claim 7 is characterized in that the negative pole of described battery comprises benzene naphthalene copolymer RESEARCH OF PYROCARBON coated graphite, carbon black and Kynoar, their weight ratio was followed successively by 10: 1: 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB01123430XA CN1144304C (en) | 2001-07-23 | 2001-07-23 | Process for preparing negative electrode material of lithium ion battery and its negative electrode and battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB01123430XA CN1144304C (en) | 2001-07-23 | 2001-07-23 | Process for preparing negative electrode material of lithium ion battery and its negative electrode and battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1328350A true CN1328350A (en) | 2001-12-26 |
| CN1144304C CN1144304C (en) | 2004-03-31 |
Family
ID=4665049
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB01123430XA Expired - Lifetime CN1144304C (en) | 2001-07-23 | 2001-07-23 | Process for preparing negative electrode material of lithium ion battery and its negative electrode and battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1144304C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100407476C (en) * | 2005-03-25 | 2008-07-30 | 韩国轮胎株式会社 | Battery with porous sealed canister |
| CN104979530A (en) * | 2014-08-29 | 2015-10-14 | 湖北工程学院 | Preparation method of natural graphite-based composite electrode material |
| WO2022174649A1 (en) * | 2021-02-18 | 2022-08-25 | Oppo广东移动通信有限公司 | Silicon-based negative electrode material and preparation method therefor, and negative electrode, battery and electronic apparatus |
| CN117374515A (en) * | 2023-12-06 | 2024-01-09 | 天津力神电池股份有限公司 | Separator with lithium ion capacity compensation function, preparation method thereof and battery |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1326267C (en) * | 2005-05-27 | 2007-07-11 | 深圳市贝特瑞电子材料有限公司 | Cathode material of composite carbon in use for lithium ion battery and preparation method |
-
2001
- 2001-07-23 CN CNB01123430XA patent/CN1144304C/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100407476C (en) * | 2005-03-25 | 2008-07-30 | 韩国轮胎株式会社 | Battery with porous sealed canister |
| CN104979530A (en) * | 2014-08-29 | 2015-10-14 | 湖北工程学院 | Preparation method of natural graphite-based composite electrode material |
| CN104979530B (en) * | 2014-08-29 | 2017-05-10 | 湖北工程学院 | Preparation method of natural graphite-based composite electrode material |
| WO2022174649A1 (en) * | 2021-02-18 | 2022-08-25 | Oppo广东移动通信有限公司 | Silicon-based negative electrode material and preparation method therefor, and negative electrode, battery and electronic apparatus |
| CN117374515A (en) * | 2023-12-06 | 2024-01-09 | 天津力神电池股份有限公司 | Separator with lithium ion capacity compensation function, preparation method thereof and battery |
| CN117374515B (en) * | 2023-12-06 | 2024-04-19 | 天津力神电池股份有限公司 | Separator with lithium ion capacity compensation function, preparation method thereof and battery |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1144304C (en) | 2004-03-31 |
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Denomination of invention: Process for preparing negative electrode material of lithium ion battery and its negative electrode and battery Effective date of registration: 20190328 Granted publication date: 20040331 Pledgee: Bank of China, Limited by Share Ltd, Huangzhong County branch Pledgor: Xianxing Science-Technology-Industry Co., Ltd., Beijing Univ|PULEAD TECHNOLOGY INDUSTRY CO., LTD. Registration number: 2019990000271 |
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Denomination of invention: A preparation method of lithium ion battery anode material, anode and battery Effective date of registration: 20200812 Granted publication date: 20040331 Pledgee: Bank of China Limited by Share Ltd. Huangzhong County branch Pledgor: PULEAD TECHNOLOGY INDUSTRY Co.,Ltd. Registration number: Y2020990000946 |
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