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Title:
LITHIUM SECONDARY BATTERY
Document Type and Number:
Japanese Patent JPS6427160
Kind Code:
A
Abstract:

PURPOSE: To prevent internal shortcircuiting effectively by forming a separator from an alternate lamination of porous high-density films with resistance against electrolyte and unwoven cloths with two or more layers, and by arranging unwoven cloths on the negative pole side.

CONSTITUTION: Alternate lamination of two or more unwoven cloths and films are formed, wherein the unwoven cloths 5 are of glass fiber etc., having a thickness of 60∼200μm, a density of 0.3∼0.45g/cm3, while the films are of polyethlene etc., having a thickness of 25∼100μm and a density of 0.5∼0.6g/cm3, and the unwoven cloths 5 are arranged on the negative pole 1 side. The negative pole is made of metal Li etc., while the positive pole is of an electroconductive polymer such as polyacetylene, and the solution used shall for ex. be LiClO4, and the solvent 1,2-dimethoxyethane, whereto triethyl amin etc., is added as a stabilizer. According to this arrangement, eventual production of Li dendrite on the negative pole 1 will not necessarily lead directly to internal shortcircuiting, that should prolong the cycle life of a Li secondary battery.


Inventors:
KOSEKI MITSURU
FUJITA MASARU
NAKAMURA YASUO
FUNADA ATSUKI
Application Number:
JP18116787A
Publication Date:
January 30, 1989
Filing Date:
July 22, 1987
Export Citation:
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Assignee:
SHIN KOBE ELECTRIC MACHINERY
HITACHI LTD
HITACHI CHEMICAL CO LTD
SHOWA DENKO KK
International Classes:
H01M2/16; (IPC1-7): H01M2/16
Attorney, Agent or Firm:
Hidetoshi Matsumoto