SEPARTOR FOR HIGH-POWER DENSITY LITHIUM ION SECONDARY BATTERY (AS AMENDED)
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United States of America Patent
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Issued Date -
Mar 10, 2011
app pub date -
May 11, 2009
filing date -
May 9, 2008
priority date (Note) -
Abandoned
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Abstract
There is provided a separator for a high-power density lithium ion secondary battery, the separator comprising a polyolefin microporous membrane, wherein the polyolefin microporous membrane has a tensile strength in the longitudinal direction (MD) of 50 MPa or higher and a tensile strength in the transverse direction (TD) of 50 MPa or higher, and a sum total of an MD tensile elongation and a TD tensile elongation of 20 to 250%; and the polyolefin microporous membrane comprises a polypropylene.
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