Panasonic Intellectual Property Management Co., Ltd.

Panasonic Holdings Corporation

Panasonic Energy Co., Ltd.

Yukihiro Oki

Masahisa Fujimoto

Atsushi Ogata

Shun Nomura

A nonaqueous electrolyte secondary battery according to the present invention is provided with a negative electrode, a positive electrode and a nonaqueous electrolyte. A negative electrode active material contained in the negative electrode contains a zinc manganese alloy that is represented by general formula MnZn(3≤x≤13).

Negative electrode active material for nonaqueous electrolyte secondary batteries, and nonaqueous electrolyte secondary battery

A nonaqueous electrolyte secondary battery according to the present invention is provided with a negative electrode, a positive electrode and a nonaqueous electrolyte. A negative electrode active material contained in the negative electrode contains a zinc manganese alloy containing Zn, Mn and Fe that is in an amount of 1,000 ppm or less of the total mass of Zn and Mn. With respect to the zinc manganese alloy, the molar ratio of the Zn content to the Mn content is from 3 to 13.

A nonaqueous electrolyte secondary battery () in an example embodiment includes a positive electrode () having a lithium metal composite oxide, and a negative electrode () having graphite. The lithium metal composite oxide includes first composite oxide particles which are secondary particles formed by aggregation of primary particles having an average particle size of 50 nm to 5 μm, and second composite oxide particles which are non-aggregated particles having an average particle size of 2 μm to 20 μm. The positive electrode () has lower initial charge/discharge efficiency than the initial charge/discharge efficiency of the negative electrode ().

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Osaka, Japan

Yukihiro Oki