NEGATIVE ELECTRODE CURRENT COLLECTING COPPER FOIL FOR LITHIUM ION SECONDARY BATTERY, NEGATIVE ELECTRODE FOR LITHIUM ION SECONDARY BATTERY, LITHIUM ION SECONDARY BATTERY AND METHOD FOR MANUFACTURING NEGATIVE ELECTRODE CURRENT COLLECTING COPPER FOIL FOR LITHIUM ION SECONDARY BATTERY

摘要

PURPOSE: A negative electrode current collecting copper foil for a lithium ion secondary battery is provided to suppress the separation of a negative electrode active material from a negative current collecting copper film, thereby obtaining an excellent lithium ion secondary battery with excellent cycle properties. CONSTITUTION: A negative electrode current collecting copper foil for a lithium ion secondary battery comprises a copper film(11) which consists of copper or copper alloy; and deposited particles(13a,13b) attached to one side of the copper film. The average particle diameter of the deposited particles is 0.4 micron - 1.0 micron. The number of the deposited particles is 150-650 per 100 micron^2.