Title:
BATTERY SEPARATOR AND ITS MANUFACTURING METHOD
Document Type and Number:
Japanese Patent JP2003142064
Kind Code:
A
Abstract:
To provide a thin battery separator suitable for a lithium ion battery and having a high-temperature shutdown characteristic and to provide its manufacturing method.
This battery separator is formed of fibrous porous sheet of a branched α-olefin polymer, in particular, poly-4-methyl-1-pentene having a sheet thickness of 5-100 μm, a basis weight of 5-50 g/m2, a porosity of 10-70% and the maximum pore diameter of 30 μm or less. This method is used for manufacturing the fibrous porous sheet for the battery separator by a nonwoven fabric pressing process of a melt-blown method of the branched α-olefin polymer.
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Inventors:
SUZUKI HIDEFUMI
SUDO YASUHIRO
SUDO YASUHIRO
Application Number:
JP2002222464A
Publication Date:
May 16, 2003
Filing Date:
July 31, 2002
Export Citation:
Assignee:
MITSUI CHEMICALS INC
International Classes:
B29C43/24; H01M2/16; B29K23/00; B29L31/34; (IPC1-7): H01M2/16; B29C43/24
Domestic Patent References:
| JP2002246001A | 2002-08-30 | |||
| JP2002124238A | 2002-04-26 |
Attorney, Agent or Firm:
Shigemitsu Nakajima (1 outside)