Panasonic Intellectual Property Management Co., Ltd.

Panasonic Holdings Corporation

Panasonic Energy Co., Ltd.

Hirokazu Wada

Katsunori Yanagida

Kouhei Tsuzuki

Yuki Morikawa

Kaori Ishikawa

Akihiko Takada

Yuta Matsuo

A negative electrode for a nonaqueous electrolyte secondary battery, said negative electrode comprising a negative-electrode current collector, and a negative-electrode active material layer provided upon the negative-electrode current collector, wherein the negative-electrode active material layer includes a negative-electrode active material and a styrene-butadiene rubber, and the glass transition temperature (Tg) of the styrene-butadiene rubber in an area that extends 10% in the thickness direction from the surface of the reverse side of the negative-electrode active material layer from the negative-electrode current collector is higher than that of the styrene-butadiene rubber in an area that extends 10% in the thickness direction from the surface of the negative-electrode current collector side of the negative-electrode active material layer.

Negative electrode for nonaqueous electrolyte secondary battery, and nonaqueous electrolyte secondary battery

A negative electrode for a nonaqueous electrolyte secondary battery, said negative electrode comprising a negative-electrode current collector, and a negative-electrode active material layer provided upon the negative-electrode current collector, wherein the negative-electrode active material layer includes a negative-electrode active material and carboxymethyl cellulose, wherein the molecular weight of the carboxymethyl cellulose in an area that extends 10% in the thickness direction from the surface of the negative-electrode current collector side of the negative-electrode active material layer is smaller than that of the carboxymethyl cellulose in an area that extends 10% in the thickness direction from the surface of the reverse side of the negative-electrode active material layer from the negative-electrode current collector.

A negative electrode for a nonaqueous electrolyte secondary battery, said negative electrode comprising a negative-electrode current collector, and a negative-electrode active material layer provided upon the negative-electrode current collector, wherein the negative-electrode active material layer includes a negative-electrode active material and polyvinylpyrrolidone, and an area that extends 10% in the thickness direction from the surface of the reverse side of the negative-electrode active material layer from the negative-electrode current collector has a higher polyvinylpyrrolidone content than an area that extends 10% in the thickness direction from the surface of the negative-electrode current collector side of the negative-electrode active material layer.

In a nonaqueous electrolyte secondary battery, a negative electrode mix layer includes a first layer and a second layer disposed successively from a negative electrode collector. The first layer contains a first carbon-based active material having a 10% compressive strength of 3 MPa or less and a silicon-based active material containing Si. The second layer contains a second carbon-based active material having a 10% compressive strength of 5 MPa or more and has a lower content (mass ratio) of the silicon-based active material than the first layer.

Negative electrode including first layer having low compressive strength carbon active material and silicon active material and second layer having high compressive strength carbon active material and nonaqueous electrolyte secondary battery including the same

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Osaka, Japan

Hirokazu Wada