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Lithium ion secondary battery

A secondary battery and lithium-ion technology, applied in the direction of secondary batteries, lithium batteries, battery electrodes, etc., to achieve the effects of preventing thermal runaway, easy to increase output power, and easy to increase capacity

Inactive Publication Date: 2010-03-24
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in Patent Document 5, it is only described that the positive electrode active material combined with the thin-film negative electrode active material layer is lithium cobalt oxide as a lithium-cobalt composite oxide, and there is no description of the lithium-containing nickel composite oxide.
In addition, it is also possible to obtain high capacity, high output and long life by using a thin-film negative electrode active material layer mainly composed of an alloy-based negative electrode active material and a lithium-containing nickel composite oxide, and it is also safe. There is no record of further improved lithium-ion secondary batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0159] (1) Preparation of positive electrode active material

[0160] in NiSO 4 To the aqueous solution of Ni:Co:Al=7:2:1 (molar ratio), Co and Al sulfate were added to prepare an aqueous solution with a metal ion concentration of 2 mol / L. Slowly add 2 mol / L sodium hydroxide solution dropwise to the aqueous solution under stirring for neutralization, thus producing Ni 0.7 co 0.2 al 0.1 (OH) 2 Ternary system precipitates of the indicated composition. This precipitate was separated by filtration, washed with water, and dried at 80° C. to obtain a composite hydroxide. As a result of measuring the average particle diameter of the obtained composite hydroxide with a particle size distribution meter (trade name: MT3000, manufactured by Nikkiso Co., Ltd.), the average particle diameter was 10 μm.

[0161] The composite hydroxide was heat-treated at 900°C for 10 hours in the atmosphere to obtain Ni 0.7 co 0.2 al 0.1 A ternary composite oxide with the composition shown in O. ...

Embodiment 2

[0181] A lithium ion secondary battery of the present invention was produced in the same manner as in Example 1, except that the method of producing the negative electrode was changed as follows.

[0182] (production of negative electrode)

[0183] Chromium oxide was sprayed on the surface of an iron roll with a diameter of 50 mm to form a ceramic layer with a thickness of 100 μm. On the surface of this ceramic layer, a circular concave portion or hole with a diameter of 12 μm and a depth of 8 μm was formed by laser processing, and a roll for convex portion was produced. The holes were set in a closest-packed arrangement with an inter-axis distance of 20 μm from adjacent holes. The bottom of the hole has a substantially planar central portion and a rounded portion where the end of the bottom connects to the side surfaces of the hole.

[0184] On the other hand, an alloy copper foil (trade name: HCL-02Z, thickness 20 μm, manufactured by Hitachi Electric Cable Co., Ltd.) conta...

Embodiment 3

[0215] A strip-shaped positive electrode was produced in the same manner as in Example 1. A portion exposing the positive electrode current collector was provided on the positive electrode, and one end of a positive electrode lead made of aluminum was connected to this portion. In addition, a belt-shaped negative electrode was produced in the same manner as in Example 2. A portion exposing the negative electrode current collector was provided on the negative electrode, and one end of a nickel negative electrode lead was connected to this portion. Separator and nonaqueous electrolyte The same separator and nonaqueous electrolyte as in Example 1 were used. The separator was wound between the positive electrode and the negative electrode to prepare a wound electrode group with 20 windings. At this time, the width and length of the positive electrode and the negative electrode were changed, and the design capacity of the obtained battery was set to 1150mAh, 1800mAh or 3750mAh. ...

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Abstract

Disclosed is a lithium ion secondary battery wherein a lithium nickel-containing complex oxide containing lithium and nickel is used as a positive electrode active material contained in the positive electrode, and a negative electrode active material which has a melting temperature not more than 1200 DEG C when lithium is absorbed thereto is contained in a negative electrode active material layerin the negative electrode. By having such a constitution, the lithium ion secondary battery has higher capacity, higher output and longer life, while being further improved in safety. Particularly inthis lithium ion secondary battery, heat generation due to internal short-circuit is suppressed, thereby surely preventing occurrence of thermal runaway during a nail penetration test.

Description

technical field [0001] The present invention relates to lithium ion secondary batteries. More specifically, the present invention mainly relates to the improvement of negative electrodes. Background technique [0002] Due to its high capacity and high energy density, lithium-ion secondary batteries are easy to miniaturize and lighten, so they are widely used as portable batteries such as mobile phones, portable information terminals (PDAs), notebook personal computers, video cameras, and portable game machines. Power supply for electronic equipment. As a representative lithium-ion secondary battery, a lithium-ion secondary battery in which an electrode group including a positive electrode, a separator, and a negative electrode is housed in a battery can, wherein the positive electrode is formed on the surface of an aluminum foil (positive electrode collector) containing lithium The positive electrode active material layer of a cobalt compound, the separator is a porous fil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/02H01M4/38H01M4/48H01M4/50H01M4/52H01M4/58H01M10/40H01M4/13H01M4/134H01M4/136H01M4/505H01M4/525H01M10/052H01M10/0585H01M10/0587
CPCH01M4/505Y02E60/122H01M4/525H01M10/0525Y02T10/7011H01M2004/021H01M4/485Y02E60/10Y02P70/50H01M4/36
Inventor 武泽秀治藤川万乡中井美有纪笠松真治横山智彦
Owner PANASONIC CORP
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