The Furukawa Electric Co., Ltd.

Masato Ebisugi

Satoshi Yamazaki

Akitoshi Suzuki

Hirokazu Sasaki

Kensaku Shinozaki

Kimiko Fujisawa

Takahiro Tsuruta

Takeshi Ezura

Jun Shinozaki

The invention relates to an electrolytic copper alloy foil having large mechanical strength in an ordinary state and showing resistant to heat deterioration even when it is heated to 300&#xb0; C. or more. That electrolytic copper alloy foil, which contains tungsten copper, preferably incorporates tungsten into copper foil as a copper alloy, has a tensile strength at ordinary temperature of 650 MPa, has a tensile strength after heat treatment at 300&#xb0; C. for 1 hour of 450 MPa or more, and has a conductivity of 80% or more. Further preferably, the electrolytic copper foil has an elongation at ordinary temperature of 2.5% or more and an elongation after treatment at 300&#xb0; C. for 1 hour of 3.5% or more. The electrolytic copper foil is produced by adding a thiourea compound, tungsten salt, and chloride ions to a sulfuric acid-copper sulfate electrolyte and performing electrolytic deposition.

Electrolysis copper-alloy foil, method of the same, electrolytic-solution using the production, negative electrode aggregation used the same, secondary battery, and electrode of the same

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Tokyo, Japan

Masato Ebisugi