Lithium ion secondary battery
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United States of America Patent
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Feb 14, 2012
Grant Date -
Jun 14, 2007
app pub date -
Dec 11, 2006
filing date -
Dec 12, 2005
priority date (Note) -
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Abstract
A lithium ion secondary battery, having a positive electrode, a negative electrode, and a separator provided between the positive electrode and the negative electrode, the positive electrode and the negative electrode each having a collector and an active material layer provided over the collector, and the relationship Ts≧4Tc being satisfied, where Ts is the puncture strength of the separator, and Tc is the puncture strength of the collector of the positive electrode and/or the negative electrode.
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