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A kind of preparation method of silicon copper lithium ion battery negative electrode

A lithium-ion battery, silicon-copper technology, applied in the direction of battery electrodes, negative electrodes, active material electrodes, etc., can solve the problems of low conductivity and actual capacity, not enough to maintain the stability of the conductive network structure, and aggravate battery capacity attenuation, etc., to achieve Excellent battery performance, improved conductivity, and the effects of buffering volume changes during charge and discharge

Active Publication Date: 2021-12-10
HUNAN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above method usually adopts the traditional coating process to prepare the medium silicon negative electrode. The electrode slurry contains a conductive agent and a binder, and the non-conductive polymer binder swells in the EC / DMC electrolyte system, which leads to the collapse of the conductive network and aggravates the problem. battery capacity fading
Chinese patent (CN105489839A) coats copper-silicon composites, reducing agents containing C, H, and O elements on the current collector, and reduces them under an inert atmosphere to obtain a copper-silicon negative electrode. However, pyrolytic carbon is generally amorphous carbon, and the electrical conductivity And the actual capacity is low, not enough to maintain the structural stability of the conductive network during the cycle

Method used

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  • A kind of preparation method of silicon copper lithium ion battery negative electrode
  • A kind of preparation method of silicon copper lithium ion battery negative electrode
  • A kind of preparation method of silicon copper lithium ion battery negative electrode

Examples

Experimental program
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Effect test

Embodiment 1

[0036] (1) Ultrasonic disperse 3.75g copper acetate monohydrate in 300mL deionized water, add 300mL ethylene glycol solution during the ultrasonic process, and add 0.10g nano-silica powder in batches after obtaining a clear and transparent solution. in a constant temperature water bath of 60°C.

[0037] (2) Separately prepare a precipitating agent: 200 mL of a water / ethylene glycol mixed solution with a volume ratio of 1:1 containing 1.93 g of oxalic acid.

[0038] (3) Slowly add the solution of step (2) to the solution of step (1) dropwise at a rate of 2 mL / min. After the drop is completed, control the reaction temperature to 60° C. and the reaction time to 6 hours.

[0039] (4) After the reaction is finished, the product obtained in step (3) is suction filtered, the filter cake is washed twice with water, and washed once with alcohol after the solution is clarified.

[0040] (5) The obtained slurry is coated on the cleaned foamed copper collector, and at 5MPa / cm 2 Press do...

Embodiment 2

[0043] (1) Ultrasonically disperse 1.44g of anhydrous copper chloride in 300mL of ethylene glycol, add 100mL of ethylene glycol during the ultrasonic process, and then add 0.10g of nano-silica powder in batches to obtain a clear and transparent solution. 80°C constant temperature water bath.

[0044] (2) Separately prepare a precipitant: 100 mL of ethylene glycol solution containing 1.16 g of oxalic acid.

[0045] (3) Slowly add the solution of step (2) to the solution of step (1) dropwise at a rate of 2 mL / min. After the drop is completed, control the reaction temperature to 80° C. and the reaction time to 5 hours.

[0046] (4) After the reaction is finished, the product obtained in step (3) is suction filtered, the filter cake is washed twice with water, and washed once with alcohol after the solution is clarified.

[0047] (5) Vacuum-dry the obtained slurry at 90°C for 12 hours to obtain a precursor powder. Without using any current collector, place 0.015g of the 2 Press ...

Embodiment 3

[0050] (1) Ultrasonically disperse 1.44g of anhydrous copper chloride in 300mL of ethylene glycol, add 100mL of ethylene glycol during the ultrasonic process, and then add 0.10g of nano-silica powder in batches after obtaining a clear and transparent solution. Stir in an 80°C constant temperature oil bath.

[0051] (2) Separately prepare a precipitant: 100 mL of ethylene glycol solution containing 1.16 g of oxalic acid.

[0052] (3) Slowly add the solution of step (2) to the solution of step (1) dropwise at a rate of 2 mL / min. After the drop is completed, control the reaction temperature to 80° C. and the reaction time to 3 hours.

[0053] (4) After the reaction is finished, the product obtained in step (3) is suction filtered, the filter cake is washed twice with water, and washed once with alcohol after the solution is clarified.

[0054] (5) The obtained slurry is coated on the cleaned foamed nickel collector, and at 5MPa / cm 2 Press down to form a pole piece with a thickn...

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Abstract

The invention relates to a method for preparing a silicon-copper negative electrode for a lithium-ion battery, specifically: using nano-silicon powder as a raw material, and in situ precipitating the silicon powder into a copper oxalate-silicon precursor according to a mass ratio of 0.1 to 60 wt.% silicon-copper , coating this precursor slurry on the current collector, after pressing, drying, and calcining in a protective atmosphere, an integrated negative electrode of "nano-copper-nano-silicon-current collector" is obtained; after subsequent coating with nano-silver or conductive polymer, further Optimize this silicon copper electrode. The present invention utilizes the excellent ductility and conductivity of copper oxalate in-situ grown nano-copper to alleviate the large volume expansion and poor conductivity of nano-silicon powder, and further optimizes the electrode performance by subsequent coating of nano-silver and conductive polymers, and finally obtains The cycle stability of the electrode is excellent.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a preparation method of a nano-silicon / copper composite battery electrode material and a negative pole piece. Background technique [0002] Lithium-ion batteries are widely used in modern society as high energy density, no memory effect, green and environmentally friendly rechargeable batteries. At present, the promotion and popularization of power vehicles and the development of new energy storage have made the demand for high-energy, high-power, and long-life lithium-ion batteries increasingly urgent. [0003] The specific capacity of graphite, a traditional commercial anode material, is close to the theoretical value (372mAh g -1 ), the space for improvement is limited; in recent years, Li 4 Ti 5 o 12 Negative electrode materials are widely used in battery systems with ternary materials as positive electrodes, but their theoretical specific capacity is low ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1395
CPCH01M4/1395H01M2004/027Y02E60/10
Inventor 杨立山周灵邵俐
Owner HUNAN NORMAL UNIVERSITY