ELECTROLYTIC COPPER FOIL, BATTERY CURRENT COLLECTOR COMPRISING SAID ELECTROLYTIC COPPER FOIL, ELECTRODE OBTAINED USING SAID CURRENT COLLECTOR FOR SECONDARY BATTERY, AND SECONDARY BATTERY OBTAINED USING SAID ELECTRODE

WIPO Patent Application WO/2014/119583

A1

An electrolytic copper foil is provided in which the tensile strength measured at ordinary temperature after a 300ºC×1 hour heat treatment is 500 MPa or higher. Also provided is an electrolytic copper foil which, when laminated to a polyimide film, gives a printed wiring board having excellent mechanical strength. Furthermore provided is a copper alloy foil which, when used as a current collector (copper foil) in a lithium-ion secondary battery employing an active material based on an Si or Sn alloy, retains adhesion to the active material with the aid of a polyimide binder and suffers neither deformation nor breakage. The electrolytic copper foils contain tungsten in an amount of 0.06-0.5 wt%, with the remainder comprising copper. The electrolytic copper foils have a tensile strength measured at ordinary temperature after a 300ºC×1 hour heat treatment of 500 MPa or higher. A secondary battery is further provided in which either of the electrolytic copper foils is used as a current collector.

EBISUGI MASATO (JP)
SUZUKI AKITOSHI (JP)
SHINOZAKI KENSAKU (JP)
FUJISAWA KIMIKO (JP)
EZURA TAKESHI (JP)

PCT/JP2014/051861

August 07, 2014

January 28, 2014

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FURUKAWA ELECTRIC CO LTD (JP)

C25D1/04; C22C9/00; C22F1/08; C25D1/00; H01M4/13; H01M4/64; H01M4/66; C22F1/00; C22F1/02

WO2013065699A1	2013-05-10
WO2013018773A1	2013-02-07

JP3238278B2	2001-12-10
JPH0967693A	1997-03-11

SATOH, TAKAHISA (JP)
Takahisa Sato (JP)

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