Non-aqueous electrolyte secondary cell

A non-aqueous electrolyte, secondary battery technology, applied in non-aqueous electrolyte storage batteries, non-aqueous electrolyte storage battery electrodes, secondary batteries and other directions

Inactive Publication Date: 2008-08-06
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] However, the lithium carbonate contained in the negative electrode is not used to prevent overcharge

Method used

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Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0026] (production of positive electrode)

[0027] Mixed lithium carbonate and Ni 0.33 co 0.34 mn 0.33 (OH) 2 The co-precipitated hydroxide indicated was fired at 1000°C for 20 hours in an air atmosphere to obtain nickel-cobalt lithium manganate (LiNi 0.03 co 0.34 mn 0.33 o 2 ). In addition, by a known method, spinel-type lithium manganese oxide (LiMn 2 o 4 ).

[0028] 93 parts by mass of the positive electrode active material formed by mixing the spinel-type lithium manganate and the nickel-cobalt lithium manganate with a mass ratio of 4:6, 3 parts by mass of the conductive agent made of acetylene carbon black, 3 parts by mass of a binder composed of polyvinylidene fluoride, 1 part by mass of lithium carbonate, and N-methylpyrrolidone were mixed to prepare a positive electrode active material slurry. This positive electrode active material slurry was applied to both surfaces of a 20 μm thick positive electrode current collector made of aluminum foil, dried, and rol...

experiment example 2

[0038] Except that the positive electrode active material was 94 parts by mass and lithium carbonate was 0 parts by mass, the lithium ion secondary battery in Comparative Example 1 was produced in the same manner as in Experimental Example 1 above.

experiment example 3

[0040] Except that the positive electrode active material was 93.7 parts by mass and lithium carbonate was 0.3 parts by mass, the lithium ion secondary battery in Comparative Example 2 was produced in the same manner as in Experimental Example 1 above.

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PUM

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Abstract

A non-aqueous electrolyte secondary cell superior in safety against overcharge and in high-temperature cycle characteristic is provided. The non-aqueous electrolyte secondary cell includes a positive electrode, a negative electrode, a non-aqueous electrolyte, and a pressure sensitive safety mechanism that is actuated upon increase in the cell internal pressure. The positive electrode contains lithium carbonate at 0.5 to 1.5 mass %. The non-aqueous electrolyte contains a cycloalkyl benzene compound and / or a compound having a benzene ring and a quaternary carbon adjacent to the benzene ring, the compound or compounds being contained at 0.5 to 2 mass % in total.

Description

technical field [0001] The present invention relates to an improvement of a non-aqueous electrolyte secondary battery for improving overcharge safety and high-temperature cycle characteristics. Background technique [0002] Today, mobile information terminals such as mobile phones and notebook computers are rapidly becoming more functional, smaller, and lighter. As driving power sources for these terminals, nonaqueous electrolyte secondary batteries typified by lithium ion secondary batteries having high energy density and high capacity are widely used. [0003] Since such a lithium ion secondary battery uses a flammable organic solvent, it is necessary to ensure safety when the battery becomes abnormal due to overcharge or the like. [0004] For this reason, in order to improve the overcharge safety of non-aqueous electrolyte secondary battery, proposed in the patent document 1 will according to the rise of the internal pressure of the battery actuated current breaking mec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01M4/02H01M2/34H01M4/13H01M4/62H01M10/05H01M10/0567
CPCH01M10/052H01M4/5825H01M4/525H01M2004/028H01M10/0567H01M10/0568H01M6/168Y02E60/122Y02E60/10Y02P70/50
Inventor 冈崎泰宪诹访弘光大木雅统滨崎和树山下修一富本和生
Owner SANYO ELECTRIC CO LTD
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