Mitsui Minings & Melting Co., Ltd.

Yoshiki Sakaguchi

Kiyotaka Yasuda

Hitohiko Honda

Tomoyoshi Matsushima

Shingo Kikugawa

Masahiro Hyakutake

Makoto Dobashi

Daisuke Mukai

Akihiro Modeki

Kazuko Taniguchi

Akira Uchiyama

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.

A negative electrodefor nonaqueous secondary batteries characterized by having an active material layerand a metallic lithium layerboth between a pair of current collecting surface layers. The negative electrodehas two negative electrode precursorseach composed of the current collecting surface layerand the active material layeron one side of the surface layer. The two negative electrode precursorsare united with their active material layersfacing each other and with the metallic lithium layersandwiched therebetween. A metallic material having low capability of forming a lithium compound penetrates through the whole thickness of the active material layer

Negative electrode for nonaqueous secondary battery and process of producing the same

An anode for a nonaqueous secondary battery comprising a current collector having formed thereon a first covering layer containing tin, a tin alloy, aluminum or an aluminum alloy and a second covering layer containing a metal having low capability of forming a lithium compound in that order. The anode may have an additional first covering layer formed on the second covering layer. A covering layer containing a copper etc. may be formed as an uppermost layer. Each layer can be formed by heat treating to get desired property. As heat treatment can be done in a short time, it has a great cost merit.

Negative electrode for non-aqueous electrolyte secondary cell and method for manufacture thereof, and non-aqueous electrolyte secondary cell

Hydrogen-occluding alloy and process for producing the same

Hydrogen storage alloy and method for preparation thereof

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Ageo, Japan

Yoshiki Sakaguchi