Hitachi Chemical Company, Ltd.

Youhei Itoh

Shingo Itoh

Tadashi Yoshiura

Takanori Kajimoto

Manabu Ochida

A lithium-ion battery with high safety is provided. A lithium-ion batteryincludes an electrode group, an electrolyte, and a battery containerthat contains the electrode groupand the electrolyte. The electrode groupis formed by stacking a positive electrode and a negative electrode via a separator. The positive electrode contains a composite oxide of lithium, nickel, manganese, and cobalt as a main positive active material. The negative electrode contains amorphous carbon as a main negative active material. The lithium-ion batteryhas a discharge capacity of 20 Ah or more. The ratio (the value of Y/X) of a volume Y occupied by the electrolyte to a volume X of a void space in the battery containeris 0.65 or more.

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Tokyo, Japan

Youhei Itoh