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|1. (WO2017155021) LITHIUM ION SECONDARY BATTERY|
|Title:||LITHIUM ION SECONDARY BATTERY|
Provided is a lithium ion secondary battery that has excellent cycle characteristics and employs a silicon material for a negative electrode. This lithium ion secondary battery is characterized by having a negative electrode that contains: plate-shaped artificial graphite that is bent, at least some of the particles having a crease on the plate surface; and a material containing silicon as a constituent element.