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Cathode and lithium ion secondary battery

A negative electrode current collector and negative electrode technology, applied in the direction of secondary batteries, battery electrodes, electrode carriers/collectors, etc., to achieve high output power, long durability, and excellent charge-discharge cycle characteristics

Inactive Publication Date: 2009-11-04
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Compared with the negative electrode of Patent Document 1, the negative electrode of Patent Document 3 can remarkably suppress the deformation and the like caused by the volume change of the alloy-based negative electrode active material, and the peeling of the columns from the metal foil is also less, but there is still further improvement. room for

Method used

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  • Cathode and lithium ion secondary battery
  • Cathode and lithium ion secondary battery
  • Cathode and lithium ion secondary battery

Examples

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Embodiment 1

[0125] (1) Preparation of positive electrode active material

[0126] in NiSO 4 Cobalt sulfate and aluminum sulfate were added to the aqueous solution so that Ni:Co:Al=7:2:1 (molar ratio), and an aqueous solution having a metal ion concentration of 2 mol / L was prepared. 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.

[0127] 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 wit...

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Abstract

In the cathode of the invention, a cathode current collection body contains a flaky base material part and a plurality of banquettes, wherein the banquettes are arranged on the surface of the base material part. A cathode active substance layer contains a column-shaped active substance layer having alloy series cathode active substance, and a stacking active substance layer. The column-shaped active substance layer contains a plurality of column-shaped bodies extending from the banquette surface outwards. The stacking active substance layer is formed by stacking films in crenellate mode on the base material part surface between two neighboring banquettes. By using the cathode, it is capable of restraining the deformation of the cathode and preventing the cathode active substance layer from peeling from the cathode current collection body, thus a lithium ion secondary battery having characteristics of excellent charge / discharge circle performance and output horsepower is obtained.

Description

technical field [0001] The invention relates to a negative pole and a lithium ion secondary battery. More specifically, the present invention mainly relates to the improvement of negative electrodes. Background technique [0002] Lithium secondary batteries are widely used as power sources for portable electronic devices because they have high capacity and high energy density, and are easy to miniaturize and lighten. Portable small electronic devices include cellular phones, portable data terminals (PDAs), notebook personal computers, video cameras, portable game machines, and the like. In a typical lithium ion secondary battery, a positive electrode containing a lithium cobalt compound as a positive electrode active material, a separator which is a porous polyolefin film, and a negative electrode containing a carbon material such as graphite as a negative electrode active material are used. [0003] Recently, as the multifunctionalization of portable small electronic devi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/02H01M4/64H01M4/36H01M10/36H01M10/40H01M4/13H01M4/38H01M4/58H01M4/70
CPCY02E60/122H01M4/661H01M4/1395H01M4/70H01M4/0421H01M2004/021H01M4/134H01M4/043H01M4/362Y02E60/10H01M4/02H01M4/38H01M10/05
Inventor 柏木克巨宇贺治正弥
Owner PANASONIC CORP
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