Chang Chun Petrochemical Co., Ltd.

Hsi-Hsing Lo

Yao-Sheng Lai

Kuei-Sen Cheng

Jui-Chang Chou

Yueh-Min Liu

Huei-Fang Huang

Tsang-Jin Juo

The present disclosure relates to a surface-treated copper foil which exhibits excellent affinity for an active material layer that is applied to the copper foil in the manufacture of a negative electrode (anode), for use in secondary lithium-ion batteries. The copper foil is plated with chromium and zinc and subsequently subjected to an organic treatment. The surface-treated copper has a surface tension of 34 to 58 dyne/cm and a surface roughness (Rz) of 0.8 to 2.5 &#x3bc;m, and comprises: (a) copper foil; (b) a zinc-chromium layer plated one or both sides of the copper foil, wherein the zinc content in the zinc-chromium layer is from 10 to 120 &#x3bc;g/dmand the chromium content in the zinc-chromium layer is from 10 to 35 &#x3bc;g/dm; and (c) an organic hydrophobic layer applied to the zinc-chromium layer.

Surface-treated copper foil

An electrodeposited copper foil having a texture coefficient of a plane (200) from 50 to 80%, based on the sum of the texture coefficients of a plane (111), the plane (200), a plane (220) and a plane (200) of the electrodeposited copper foil is provided. The electrodeposited copper foil is particularly suitable for use in the applications in printed circuit boards and lithium ion secondary batteries.

Electrodeposited copper foil

An electrolytic copper foil includes a copper foil body; and a IIA-group metal adhered to a surface of the copper foil body, wherein a signal strength of the IIA group metal is greater than 0.1% based on a signal strength of copper element as 100% analyzed by a secondary ion mass spectrometer. The present invention also provides a method for cleaning copper foil and a cleaning fluid composition which is used in the cleaning method.

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Taipei, Taiwan

Hsi-Hsing Lo