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Preparation method for lithium ion battery anode active material

A negative electrode active material, lithium-ion battery technology, applied in the direction of battery electrodes, circuits, electrical components, etc., can solve the problems of poor cycle performance, low battery capacity, complicated preparation process, etc., and achieve the effect of improving capacity and cycle performance

Active Publication Date: 2012-07-04
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention solves the technical problems in the prior art that the preparation process of the lithium ion battery negative electrode active material is complex, the battery capacity is low and the cycle performance is poor

Method used

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  • Preparation method for lithium ion battery anode active material
  • Preparation method for lithium ion battery anode active material
  • Preparation method for lithium ion battery anode active material

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preparation example Construction

[0023] The invention provides a kind of preparation method of lithium ion battery negative electrode active material, comprises the following steps:

[0024] 1) Disperse the acidified graphite evenly in the organic polymer to obtain a mixed system;

[0025] 2) In a stirring state, add a solution containing an organic metal salt to the mixed system; in the organic metal salt solution, the solute contains organic tin and organic cobalt, and the solvent is an organic solvent;

[0026] 3) Sintering at 500-900° C. after drying to obtain the lithium ion battery negative electrode active material.

[0027] The negative electrode active material obtained by the preparation method of the invention has a core-shell structure, wherein the inner core is graphite, and the outer shell is tin-cobalt alloy and amorphous carbon. When preparing a negative active material with a core-shell structure in CN101740764A, the tin salt is first mixed with the organic high molecular polymer, and then m...

Embodiment 1

[0040] (1) Blend 2000g of sulfuric acid with a concentration of 98wt% and 120g of graphite, heat to 85°C, stir for 3h, wash and filter the solution, and dry at 60°C for 12h; the mass ratio of acidified graphite 96g to organic polymer P123 is 10:1 mixed evenly to get a mixed system.

[0041] (2) Dissolve 0.12mol of tetrabutyltin chloride and 0.08mol of cobalt acetate in ethylene glycol to prepare 400mL of organometallic salt solution, add the organometallic salt solution to the above mixing system, mix and stir, turn to Into a water bath, the temperature was raised to 80°C and stirred for 6h.

[0042] (3) After the stirring is completed, vacuum bake at 80°C for 12 hours to obtain the pre-product A. The pre-product A was sintered at 600° C. for 12 hours under the protection of argon to obtain the negative electrode active material B.

[0043] (4) According to the mass ratio, the negative electrode active material B: SBR: CMC = 100:6:4 was mixed evenly, and then pressed into ta...

Embodiment 2

[0045] The negative electrode active material C and the battery sample CC were prepared by the same steps as in Example 1, except that in step (3), the pre-product A was sintered at 900° C. for 12 h under the protection of argon to obtain the negative electrode active material C.

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Abstract

The invention provides a preparation method for a lithium ion battery anode active material. The preparation method comprises the following steps of: 1) uniformly dispersing acidified graphite in an organic polymer to obtain a mixed system; 2) adding an organic metal salt solution into the mixed system with stirring, wherein the solute of the organic metal salt solution contains organic tin and organic cobalt, and the solvent of the organic metal salt solution is an organic solvent; and 3) drying the mixed system, and sintering the mixed system at 500 to 900 DEG C to obtain the lithium ion battery anode active material. The preparation method for the lithium ion battery anode active material is simple in process; and a battery adopting the anode active material has high capacity and high cycling performance.

Description

technical field [0001] The invention belongs to the field of negative electrode active materials of lithium ion batteries, and in particular relates to a preparation method of negative electrode active materials of lithium ion batteries. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, large specific energy, and good safety performance. At present, the negative electrode active material of commercialized lithium-ion batteries is mainly graphite. During the process of intercalating and removing lithium, the volume change of graphite is small, so it has good cycle performance. Graphite via LiC 6 Compounds reversibly store Li + , and its theoretical mass specific capacity is only 372 mA·h / g. Compared with graphite negative electrodes, tin-based negative electrode active materials have higher specific capacity, for example, the theoretical capacity of metal tin is as high as 994mAh / g. However, during the charge and discharge process, t...

Claims

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Application Information

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IPC IPC(8): H01M4/1393
CPCY02E60/122Y02E60/10
Inventor 李世彩谢呈德马丽
Owner BYD CO LTD
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