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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., can solve the problems of battery performance degradation such as cycle characteristics, shortened electrode life, battery deformation, etc., to achieve excellent output characteristics and durable life long effect

Inactive Publication Date: 2010-04-07
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Lithium-ion secondary batteries including the negative electrodes of Patent Document 1 and Patent Document 2 tend to cause shortened life of the electrodes, deformation of the battery, etc.
It is also prone to decrease in battery performance such as cycle characteristics
In addition, the resin layer of Patent Document 1 is easily peeled off from the surface of the negative electrode active material layer as the number of charges and discharges increases.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0166] (1) Preparation of positive electrode active material

[0167] in NiSO 4 In the aqueous solution, cobalt sulfate was added according to the amount of Ni:Co=8.5:1.5 (molar ratio) to prepare an aqueous solution with a metal ion concentration of 2 mol / L. Slowly add 2mol / L sodium hydroxide solution dropwise to the aqueous solution under stirring to neutralize, thereby forming a Ni 0.85 co 0.15 (OH) 2 Indicates the composition of the ternary precipitate. The precipitate was separated by filtration, washed with water, and dried at 80°C to obtain a composite hydroxide.

[0168] Heat the composite hydroxide at 900°C for 10 hours in the atmosphere to obtain 0.85 co 0.15 A composite oxide with a composition represented by O. Lithium hydroxide monohydrate was added so that the sum of the atomic numbers of Ni and Co was equal to the atomic number of Li, and heated at 800°C for 10 hours in the atmosphere for heat treatment, so as to obtain LiNi 0.85 co 0.15 o 2 The composi...

Embodiment 2

[0192] A lithium ion secondary battery of the present invention was produced in the same manner as in Example 1 except that the production method of the negative electrode was changed as follows.

[0193] [Production of Negative Electrode]

[0194] 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, namely a hole, having a diameter of 12 μm and a depth of 8 μm was formed by laser processing to produce a roller for convex portion. The arrangement of the holes was set to be a close-packed arrangement in which the distance between the axes of a pair of adjacent holes was 20 μm. The central portion of the bottom of the hole is substantially planar, and the portion where the end of the bottom is connected to the side surface of the hole is rounded.

[0195] An alloy copper foil (trade name: HCL-02Z, 20 μm thick, manufactured by Hitac...

Embodiment 3

[0207] Except that no supporting salt (LiPF 6 ) except that the lithium ion secondary battery of the present invention was produced in the same manner as in Example 1.

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Abstract

Disclosed is a lithium ion secondary battery including: a positive electrode including a positive electrode active material layer containing a positive electrode active material, and a positive electrode current collector; a negative electrode including a thin film negative electrode active material layer containing an alloy-based negative electrode active material, and a negative electrode current collector; a separator interposed between the positive electrode and the negative electrode; and an ion-permeable resin layer formed on a surface of the thin film negative electrode active material layer. In this lithium ion secondary battery, despite the use of the alloy-based negative electrode active material, the deterioration in battery performance such as cycle characteristics and output characteristics is prevented.

Description

technical field [0001] The present invention relates to lithium ion secondary batteries. More specifically, the present invention mainly relates to an improvement of a lithium ion secondary battery including a positive electrode, a negative electrode, and a separator interposed therebetween, and the negative electrode contains an alloy-based negative electrode active material. Background technique [0002] Lithium-ion secondary batteries are widely used as power sources for portable electronic devices and the like because they have high capacity and high energy density, and are easy to reduce in size and weight. Portable electronic devices include mobile phones, personal digital assistants (PDAs), notebook computers, video cameras, portable game consoles, and the like. A typical lithium ion secondary battery includes a positive electrode containing a lithium-cobalt composite oxide, a negative electrode containing a carbon material such as graphite, and a porous film (separa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/36H01M4/02H01M4/62H01M4/134H01M4/1395H01M4/38H01M10/052H01M10/0562H01M10/0565H01M50/409H01M50/489H01M50/491
CPCH01M2004/027Y02E60/122H01M10/0525H01M4/62H01M2300/0082H01M2004/021H01M4/134H01M2/16Y02E60/10H01M50/491H01M50/489
Inventor 木下昌洋宇贺治正弥
Owner PANASONIC CORP
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