Prime Planet Energy & Solutions, Inc.

Mio Nosaka

Tetsuya Okado

Hirofusa Tanaka

Masashi Muraoka

Kazuki Takeno

A nonaqueous electrolyte secondary battery includes an electrode assembly and an electrolyte solution. The electrode assembly is impregnated with at least part of the electrolyte solution. The electrode assembly includes a positive electrode, a negative electrode, and a separator. The separator separates the positive electrode and the negative electrode from each other. The negative electrode includes a negative electrode active material. The negative electrode active material includes graphite. The following relation of a formula (1) is satisfied: '1.60&#x2264;NPR/AAR&#x2264;2.55'. 'NPR' represents a ratio of a negative electrode charging capacity to a positive electrode charging capacity. &#x201c;AAR&#x201d; represents a ratio of an effective discharging capacity of the negative electrode to a total of a capacity corresponding to an amount of inactive lithium adhered to the negative electrode and the effective discharging capacity of the negative electrode.

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Mio Nosaka