Non-aqueous electrolyte secondary battery

A non-aqueous electrolyte and secondary battery technology, which is applied to secondary batteries, battery electrodes, battery components, etc., can solve the problems of inability to prevent battery capacity decline and insufficient improvement effect

Inactive Publication Date: 2008-08-06
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, as proposed in this patent document, only single use of primary particles as the positive electrode active material cannot prevent the decline in battery capacity, so the effect of improving the charge-discharge cycle life performance is not sufficient.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] (1) Preparation of positive electrode active material

[0065] in NiSO 4 In the aqueous solution, Co and Al sulfates were added in such a way that Ni:Co:Al = 7:2:1 (molar ratio), to prepare an aqueous solution with a metal ion concentration of 2 mol / L. By slowly dropping 2 mol / L sodium hydroxide solution into the aqueous solution under agitation for neutralization, a co-precipitation method is used to form a 0.7 Co 0.2 Al 0.1 (OH) 2 Indicates the composition of the ternary system of the precipitate. The precipitate was separated by filtration, washed with water, and dried at 80° C. to obtain a composite hydroxide. The average particle diameter of the obtained composite hydroxide was measured with a particle size distribution analyzer (trade name: MT-3000, manufactured by Nikkiso Co., Ltd.), and the average particle diameter was 10 μm.

[0066] The composite hydroxide was heated in the atmosphere at 900°C for 10 hours for heat treatment to obtain 0.7 Co 0.2 Al 0.1...

Embodiment 2

[0079] A cylindrical battery B according to the present invention was fabricated in the same manner as in Example 1, except that a porous film was formed on both surfaces of the negative electrode instead of the positive electrode.

Embodiment 3

[0081] Except that the porous membrane is formed on one surface of the separator instead of the positive electrode, and when the electrode group is produced, the positive electrode and the porous membrane on the surface of the separator are arranged to face each other, and the cylindrical shape of the present invention is produced in the same manner as in Example 1. battery C.

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Abstract

In a non-aqueous electrolyte secondary battery including an electrode assembly including a positive electrode containing a positive electrode active material, a negative electrode containing a negative electrode active material, and a separator interposed therebetween; and a non-aqueous electrolyte, 80 wt % or more of the positive electrode active material is primary particles, and the separator is formed by a porous film, or the porous film is formed at at least one position from the following: between the positive electrode and the separator main body, between the negative electrode and the separator main body, and inside the separator main body, to capture the metal ions leached from the positive electrode active material. Such an arrangement enables a non-aqueous electrolyte secondary battery with significantly less decline in battery capacity, excellent charge and discharge cycle life performance, and capable of stable output for a longer period of time.

Description

technical field [0001] The present invention relates to a nonaqueous electrolyte secondary battery. More specifically, the present invention mainly relates to the improvement of positive electrode active materials. Background technique [0002] In recent years, portable and cordless electronic devices, especially small electronic devices for consumer use, have rapidly progressed. As a power source for driving such devices, the development of small, light-weight and long-life secondary batteries with high energy density is urgently desired. In addition, technological development of large-scale secondary batteries that require long-term durability and safety, such as power storage or electric vehicles, is also accelerating, not only for small consumer applications. From this point of view, since nonaqueous electrolyte secondary batteries, especially lithium secondary batteries, have high voltage and high energy density, they have been expected to be used as power sources for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01M4/02H01M2/14H01M4/48H01M4/58H01M4/485H01M4/505H01M4/525H01M10/0525H01M50/451H01M50/489H01M50/491
CPCH01M2/1686H01M10/0525H01M2004/021H01M4/485H01M4/02Y02E60/122H01M2/166H01M4/131Y02E60/10H01M50/446H01M50/451H01M50/489H01M50/491
Inventor 冈田行广藤田秀明
Owner PANASONIC CORP
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