NEGATIVE-ELECTRODE COPPER FOIL COLLECTOR FOR LITHIUM ION SECONDARY BATTERY, NEGATIVE-ELECTRODE FOR LITHIUM ION SECONDARY BATTERY, LITHIUM ION SECONDARY BATTERY AND METHOD FOR MANUFACTURING NEGATIVE-ELECTRODE COPPER FOIL COLLECTOR FOR LITHIUM ION SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To enhance adhesiveness with a negative electrode active material layer.

SOLUTION: A negative-electrode copper foil collector 10 for a lithium ion secondary battery is used for carrying a silicon-based negative electrode active material layer 15a (15b) and a tin-based negative electrode active material layer 15a (15b), and comprises a copper foil made of copper or copper alloy, and granular electrodeposits deposited on at least one face of the copper foil through a surface roughing process. An average particle diameter of the granular electrodeposit is 0.4 μm or larger and smaller than 1.0 μm, and the number of the granular electrodeposit having a particle diameter of 0.2 μm or larger and smaller than 1.5 μm is 150 pieces or more but less than 650 pieces per 100 μm2of a surface area of the copper foil.

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