Lithium-ion secondary battery and manufacturing method therefor

A technology of secondary battery and manufacturing method, which is applied in battery manufacturing, secondary battery, lithium storage battery, etc., can solve the problems of increasing metal compound process and not being suitable for mass production of batteries.

Inactive Publication Date: 2015-11-18
TOYOTA IND CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, adding a process of adding a metal compound to the negative electrode is not suitable for mass production of batteries

Method used

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  • Lithium-ion secondary battery and manufacturing method therefor
  • Lithium-ion secondary battery and manufacturing method therefor
  • Lithium-ion secondary battery and manufacturing method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0116] (manufacturing of active substance complexes)

[0117] The positive electrode active materials of samples 1 to 7 were produced by the following method.

[0118] (sample 1)

[0119] In 0.03 mol of iron (manufactured by High Purity Chemical Co., Ltd., purity 99.9%) and lithium silicate material Li 2 SiO 3 (manufactured by Kishida Chemical Co., Ltd., purity 99.5%) 20 ml of acetone was added to the 0.03 mol mixture, mixed with a zirconia ball mill at 500 rpm for 60 minutes, and dried. Mix it with the carbonate mixture. The carbonate mixture is to mix lithium carbonate (manufactured by Kishida Chemical Co., Ltd., purity 99.9%), sodium carbonate (manufactured by Kishida Chemical Co., Ltd., purity 99.5%), and potassium carbonate (Kishida Chemical Co., Ltd.) Company system, purity 99.5%). The mixing ratio was such that the carbonate mixture was 90 parts by mass with respect to 100 parts by mass of the total amount of iron and lithium silicate-based materials.

[0120] 20 ...

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Abstract

This lithium-ion secondary battery has the following: a positive electrode containing a positive-electrode active-material composite obtained by compositing a lithium-silicate material with a carbon material; a negative electrode containing a negative-electrode active material containing silicon; and an electrolyte. The irreversible capacity (A) of the positive electrode and the irreversible capacity (B) of the negative electrode satisfy the relation 0.8 < B / A < 1.2.

Description

technical field [0001] The invention relates to a lithium ion secondary battery with improved battery capacity and a manufacturing method thereof. Background technique [0002] Lithium ion secondary batteries are widely used as power sources for portable electronic devices. LiCoO is mainly used as the positive electrode active material of lithium-ion secondary batteries. 2 , LiMn 2 o 4 Graphite-based materials can be used as the negative electrode active material. Since these materials have a small irreversible capacity, they can take out the capacity as a battery without reducing the capacity of the positive electrode or the negative electrode so much. [0003] In recent years, from the viewpoint of high safety and resource quantity, as the positive electrode active material, the silicate material Li 2 MSiO 4 (at least one selected from M=Fe, Mn, and Co) is attracting attention. However, silicate materials are different from previous LiCoO 2 , LiMn 2 o 4 Compared ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/052H01M4/36H01M4/38H01M4/58
CPCH01M4/136H01M4/1395H01M4/364H01M4/386H01M4/5825H01M4/583H01M10/0525H01M2004/021Y02E60/122Y02P70/54H01M4/587Y02E60/10Y02P70/50H01M4/485H01M2004/028H01M2220/30
Inventor 小岛晶丹羽淳一川澄一仁池内勇太森下正典小岛敏胜境哲男
Owner TOYOTA IND CORP
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