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|1. (WO2018052077) LITHIUM ION SECONDARY BATTERY|
|Title:||LITHIUM ION SECONDARY BATTERY|
The purpose of one embodiment of the present invention is to provide a lithium ion secondary battery which has improved cycle properties and the negative terminal of which contains silicon oxide. The present invention relates to a lithium ion secondary battery comprising: a negative terminal containing silicon oxide; and an electrolyte containing a fluorinated acid anhydride.