LITHIUM-ION CELL
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United States of America Patent
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Issued Date -
Dec 10, 2015
app pub date -
Mar 20, 2014
filing date -
Mar 29, 2013
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Abstract
A leak test defect is suppressed which is generated by short circuit between a positive electrode and a negative electrode with a lithium metal present in the vicinity of an end portion of a separator, and an initial charge/discharge efficiency of a lithium-ion cell and cycle characteristics thereof are improved. In the lithium-ion cell, the separator includes a polyolefin as a primary material and a uniform lithium metal film formed on a surface portion thereof which is located at the negative electrode plate side and which does not face the negative electrode active material layer, and the lithium metal film is electrically insulated from the positive electrode collector.
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