Copper foil for current collector of lithium secondary battery
AssigneeChang Chun Petrochemical Co., Ltd.
InventorsHuei-Fang Huang, Kuei-Sen Cheng, Yao-Sheng Lai, Jui-Chang Chou
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Abstract
Electrodeposited copper foils having adequate puncture strength to withstand both pressure application during consolidation with negative electrode active materials during manufacture, as well as expansion/contraction during repeated charge/discharging cycles when used in a rechargeable secondary battery are described. These copper foils find specific utility as current collectors in rechargeable secondary batteries, particularly in lithium secondary battery with high capacity. Methods of making the copper foils, methods of producing negative electrode for use in lithium secondary battery and lithium secondary battery of high capacity are also described.
Claims9
An electrodeposited copper foil having a drum side and a deposit side, each of the deposit side and drum side comprise a grain size, wherein the difference in grain size is less than 0.55 μm and the number of voids in the electrodeposited copper foil is less than 5 per μm2, wherein each void in the number of voids is defined as a void having a circular diameter of at least 0.01 μm.
Dependencies are inferred from the claim text.