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Method of manufacturing lithium ion storage device

A technology for an electrical storage device and a manufacturing method, which is applied in the direction of electrolytic battery manufacturing, electrode manufacturing, and final product manufacturing, and can solve problems such as negative electrode degradation and poor cycle characteristics, and achieve the effect of increasing the charging rate and cycle characteristics

Inactive Publication Date: 2012-10-17
SUBARU CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is known that the negative electrode deteriorates due to this expansion / contraction, so the cycle characteristics are poor

Method used

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  • Method of manufacturing lithium ion storage device
  • Method of manufacturing lithium ion storage device
  • Method of manufacturing lithium ion storage device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Production of positive electrode

[0041] Weigh 90 parts by weight of LiCoO as the positive electrode active material 2 A positive electrode slurry was prepared by weighing 5 parts by weight of PVdF as a binder, weighing 5 parts by weight of carbon black as a conductive additive, and using 100 parts by weight of N-methyl-2-pyrrolidone (NMP). On an Al foil current collector (coated portion 26×40 mm, thickness 10 μm, with convex ears for connecting leads), the positive electrode slurry is applied by the doctor blade method and dried, and then formed by punching A positive electrode active material layer with a thickness of 100 μm. The weight per unit area of ​​the positive electrode active material layer is 20 mg / cm 2 .

[0042] (2) Production of negative electrode

[0043] As a negative electrode active material, 70 parts by weight of silicon powder obtained by pulverizing silicon (silicon powder manufactured by "Aldrich Corporation") to a particle size of less t...

Embodiment 2

[0053] An experiment was carried out in the same manner as in Example 1, except that pre-doping was performed at a charging rate of 0.05C until the SOC reached 5% in the pre-doping step.

[0054] In the pre-embedding process, the time required to reach SOC 5% is 1 hour, and in the initial charging process, the time required to reach SOC 65% from SOC 5% is 0.6 hours. As a result, from SOC 0% to 65 % The time required is 1.6 hours. The initial charge can be completed in a very short time. In addition, the capacity retention rate was 97%, showing very good cycle characteristics.

Embodiment 3

[0056] An experiment was performed in the same manner as in Example 1 except that the charging rate was set to 0.05C in the pre-doping step.

[0057] In the pre-embedding process, the time required to reach SOC 10% is 2 hours, and in the initial charging process, the time required to reach SOC 70% from SOC 10% is 0.6 hours. As a result, from SOC 0% to 70 % The time required is 2.6 hours. The initial charge can be completed in a very short time. In addition, the capacity retention rate was 97%, showing very good cycle characteristics.

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Abstract

The present invention allows completing a first charge in a short time, while maintaining a high cycle characteristic, in a storage device that uses a metal material, such as silicon, as a negative electrode active material. Provided is a method of manufacturing a lithium ion storage device that has a positive electrode, an alloy-based negative electrode and a lithium ion supply source for pre-doping lithium ions to the negative electrode. The method includes: a pre-doping step of pre-doping the negative electrode at a low charge rate; and a first charge step of, after the pre-doping step, performing a first charge at a charge rate that is higher than the one during the pre-doping. The present invention allows the cycle characteristic to be enhanced by lowering the charge rate during pre-doping, and allows a first charge completion time to be shortened by increasing the charge rate during the first charge.

Description

technical field [0001] The invention relates to a manufacturing method of a lithium ion storage device using an alloy negative electrode. Background technique [0002] In recent years, lithium ion power storage devices such as lithium ion secondary batteries have been used in various fields such as automobiles (EVs) and mobile information and communication related equipment. As one of such lithium ion storage devices, in a lithium ion storage device using an alloy-based negative electrode containing a metal material such as silicon as a negative electrode active material, since silicon and the like form an alloy with lithium metal during charge and discharge, So expansion / contraction occurs. It is known that the negative electrode is deteriorated due to this expansion / contraction, and thus cycle characteristics are poor. [0003] To address such a problem, for example, Patent Document 1 discloses a technique of initially charging an assembled power storage device at a low ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/058H01G11/06H01G11/22H01G11/30H01G11/50
CPCH01M10/44Y02E60/122Y02T10/7011H01M4/0438H01M10/0525H01M10/446H01M4/38H01M4/0445H01M4/134Y02E60/10Y02P70/50Y02T10/70
Inventor 宇都宫隆
Owner SUBARU CORP
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