| 摘要 |
A lithium ion secondary battery shows excellent charge/discharge properties and also excellent storage properties. The lithium ion secondary battery includes an aprotic electrolyte containing a sulfonate ester having at least two sulfonyl groups and graphite as principal component of negative electrode active substance layers, the density of the negative electrode active substance layers being not less than 0.90 g/cm3 and not more than 1.65 g/cm3.
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