Mitsui Minings & Melting Co., Ltd.

Masahiro Hyakutake

Kiyotaka Yasuda

Yoshiki Sakaguchi

Tomoyoshi Matsushima

Akihiro Modeki

Hitohiko Honda

Kayoko Shinzawa

A negative electrodefor a nonaqueous secondary battery has an active material layercontaining active material particles. The particlesare coated at least partially with a metallic materialhaving low capability of lithium compound formation. The active material layerhas voids located between the metallic material-coated particleswith a void fraction of 15% to 45%. The metallic materialon the surface of the particles is preferably present throughout the thickness of the active material layer. The active material particlesare preferably of a silicon-based material. The active material layerpreferably contains 1% to 3% by weight of an electroconductive carbon material based on the weight of the active material particles

Negative electrode for nonaqueous secondary battery

A negative electrodefor a nonaqueous secondary battery, has an active material layercontaining active material particles. The active material layerhas a metallic materialdeposited among the particles by electroplating. The negative electrodehas a large number of holesopen on at least one side thereof and extending through the thickness of the active material layer. The negative electrodefurther has a pair of current collecting layersandadapted to be brought into contact with an electrolyte. The active material layeris between the current collecting layersand. The holesopen on the negative electrodepreferably have an opening area ratio of 0.3% to 30%. At least one of the pair of the current collecting layersandpreferably has a thickness of 0.3 to 10 &#x3bc;m.

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Masahiro Hyakutake