Panasonic Intellectual Property Management Co., Ltd.

Masahiro Shiraga

Takayuki Shirane

Yoshio Kato

Manabu Takijiri

Tomoki Tsuji

Hiroyuki Fujimoto

Yoshinori Kida

A nonaqueous electrolyte secondary battery according to an embodiment of the present invention includes a positive electrode, a negative electrode, and a nonaqueous electrolyte, wherein the negative electrode contains, as a negative electrode active material, graphite particles having a volume per mass, of pores having a diameter of 2 nm or less determined by the DFT method from nitrogen adsorption isotherm, of 0.3 mm3/g or less.

Nonaqueous electrolyte secondary battery

A nonaqueous electrolyte secondary battery includes a positive electrode including a positive electrode mix layer, a negative electrode including a negative electrode mix layer, and a nonaqueous electrolyte containing a nonaqueous solvent. A surface of the negative electrode mix layer is provided with grooves. The nonaqueous electrolyte contains 10 volume percent or more of a fluorinated solvent with respect to the volume of the nonaqueous solvent and has a viscosity (25&#xb0; C.) of 3.50 mPa&#xb7;s or more as measured with a differential pressure viscometer.

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Osaka, Japan

Masahiro Shiraga