Non-aqueous electrolyte secondary battery

A non-aqueous electrolyte and secondary battery technology, applied in the direction of non-aqueous electrolyte batteries, non-aqueous electrolyte battery electrodes, battery electrodes, etc., can solve the problems of being unable to suppress storage deterioration and cycle deterioration, and difficult to obtain the effect of chelating agent addition

Inactive Publication Date: 2011-08-24
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is a problem that it is difficult to obtain the effect of adding a chelating agent, and it is impossible to suppress storage deterioration and cycle deterioration at high temperatures.

Method used

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  • Non-aqueous electrolyte secondary battery

Examples

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Comparison scheme
Effect test

Embodiment 1

[0106] A battery was produced in the same manner as for carrying out the above-mentioned invention.

[0107] The battery produced in this way is hereinafter referred to as battery A1 of the present invention.

Embodiment 2

[0109] In preparation of the inorganic particle layer on the surface of the positive electrode, a battery was produced in the same manner as in Example 1 above, except that the ratio of the chelating agent to the inorganic particles was 3.8% by mass.

[0110] The battery produced in this way is hereinafter referred to as battery A2 of the present invention.

Embodiment 3

[0112] A battery was produced in the same manner as in Example 1 above, except that no inorganic particle layer was formed on the surface of the positive electrode and an inorganic particle layer was formed on the surface of the negative electrode by the following method.

[0113] First, NMP is used as the solvent, and titanium oxide (TiO 2 , average particle size: 0.25 μm, no surface treatment layer, Ishihara Sangyo Co., Ltd. product name "CR-EL"), PVDF (polyvinylidene fluoride) was used for the NMP-based binder, and ethylenediaminetetraacetic acid was used as the chelating agent. NMP-based slurry for forming an inorganic particle layer. At this time, the solid content concentration of the inorganic particles was 30% by mass, and the ratios of the binder and the chelating agent to the inorganic particles were 3.5% by mass and 1.9% by mass, respectively. Next, in the same manner as in Example 1, the NMP-based slurry was coated on both sides of the negative electrode by gravur...

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Abstract

The present invention provides a non-aqueous electrolyte secondary battery that shows excellent high-temperature storage performance, that inhibits the battery resistance increase and the charge-discharge efficiency degradation after storage, and moreover that has a high capacity with improved reliability. The non-aqueous electrolyte secondary battery has a positive electrode (17) containing positive electrode active material, a negative electrode containing a negative electrode active material, a non-aqueous electrolyte, and a separator (18) disposed between the positive electrode (17) and the negative electrode. An inorganic particle layer (19) containing inorganic particles is formed between the positive electrode (17) and the separator (18), and the inorganic particle layer (19) contains a chelating agent (15) that forms a complex with transition metal ions.

Description

technical field [0001] The present invention relates to an improvement of a non-aqueous electrolyte secondary battery such as a lithium ion battery or a polymer battery, and particularly relates to a battery structure that has excellent storage characteristics at high temperatures and can obtain high reliability even with a battery structure characterized by high capacity. Background technique [0002] In recent years, the miniaturization and weight reduction of mobile information terminals such as mobile phones, notebook computers, and PDAs has rapidly progressed, and secondary batteries serving as the driving power sources have been required to further increase their capacity. Among secondary batteries, non-aqueous electrolyte secondary batteries with high energy density are also increasing in capacity year by year, and these mobile information terminals tend to further increase power consumption as devices become more substantial. Therefore, there is also a strong demand ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/05H01M4/62
CPCY02E60/122H01M10/052H01M4/13Y02E60/10Y02P70/50H01M4/62H01M10/05
Inventor 鉾谷伸宏南博之藤本洋行
Owner SANYO ELECTRIC CO LTD
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