Sanyo Electric Co., Ltd.

Yasunobu Iwami

Taizou Sunano

Akira Kinoshita

Masanori Maekawa

Mai Yokoi

A negative electrode for nonaqueous electrolyte secondary batteries is provided which includes SiOand allows the cycle characteristics of batteries to be enhanced. A negative electrode according to an example embodiment includes a negative electrode current collector and a negative electrode mixture layer disposed on the current collector. The negative electrode mixture layer includes SiO(0.5&#x2264;x&#x2264;1.5) particles having a carbon coating on a particle surface, carbonaceous active material particles, and a compound having at least one of a carboxyl group and a hydroxyl group and having an average number of etherifying agent moieties present per unit molecule of not more than 0.8. The carbon coating includes a first coating disposed on the surface of the SiOand a second coating disposed on the first coating and including carbon having higher crystallinity than the carbon forming the first coating.

Negative electrode including SiOx particles having carbon coating, carbonaceous active material particles, and compound having carboxyl or hydroxyl group and nonaqueous electrolyte secondary batteries

A nonaqueous electrolyte secondary battery according to one aspect of the present invention contains a dispersant in a positive electrode mixture layer. The content of a positive electrode active material in the positive electrode mixture layer is 97% by mass or more, and the content ratio of a conductive agent to a binder in the positive electrode mixture layer is 1.00-1.67. The binder is composed of a polyvinylidene fluoride which has a carboxyl group or a carboxyl group derivative as a terminal functional group.

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Tokushima, Japan

Yasunobu Iwami