Prime Planet Energy & Solutions, Inc.

Kaori Ishikawa

Kunihiko Hayashi

Yuta Matsuo

Daisuke Ikeda

Kentaro Takahashi

Naoki Uchida

Masumi Terauchi

Kazuhiro Sotome

A negative electrode active material is prepared by mixing a first graphite particle and a second graphite particle. A negative electrode including the negative electrode active material is produced. A non-aqueous electrolyte secondary battery including the negative electrode, a positive electrode, and an electrolyte solution is produced. The first graphite particle has a first number-based particle size distribution. The second graphite particle has a second number-based particle size distribution. A relationship of 'D50/D50≤0.50' is satisfied. D50 is a D50 in the first number-based particle size distribution. D50 is a D50 in the second number-based particle size distribution. A relationship of “R≤R” is satisfied. Ris an arithmetic mean of circularity of the first graphite particle. Ris an arithmetic mean of circularity of the second graphite particle.

Method of producing non-aqueous electrolyte secondary battery, and negative electrode active material

(A) A first layer is formed by applying a first negative electrode slurry to the surface of a negative electrode substrate. (B) A second layer is formed by applying a second negative electrode slurry to the surface of the first layer. The first negative electrode slurry includes a first negative electrode composite material. The second negative electrode slurry includes a second negative electrode composite material. Each of the first negative electrode composite material and the second negative electrode composite material includes a negative electrode active material and a cellulose-based binder. The negative electrode active material includes a first graphite powder and a second graphite powder. The first negative electrode composite material includes the cellulose-based binder at a first mass fraction. The second negative electrode composite material includes the cellulose-based binder at a second mass fraction.

Method of producing negative electrode plate for non-aqueous electrolyte secondary battery

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Nishinomiya, Japan

Kaori Ishikawa