NEGATIVE ELECTRODE FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERY AND NONAQUEOUS ELECTROLYTE SECONDARY BATTERY
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United States of America Patent
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Issued Date -
Feb 18, 2016
app pub date -
Mar 18, 2014
filing date -
Mar 26, 2013
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Abstract
A nonaqueous electrolyte secondary battery which has a good capacity retention ratio (cycle characteristics) and in which the expansion and shrinkage during charging and discharging are small compared with the case where a negative electrode made of only a negative electrode active material that forms an alloy with lithium is used. A negative electrode for a nonaqueous electrolyte secondary battery according to one aspect of the present invention includes a negative electrode mixture layer formed on a current collector and containing a binder and a negative electrode active material particle that forms an alloy with lithium. The negative electrode mixture layer includes pillar portions, and a value of S1/S2 is 0.46 or more and 0.58 or less, where S1 represents a total area of the pillar portions in plan view and S2 represents a total area of one surface of the negative electrode current collector in plan view.
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