NEGATIVE ELECTRODE MATERIAL FOR LITHIUM ION SECONDARY BATTERY, NEGATIVE ELECTRODE FOR LITHIUM ION SECONDARY BATTERY, AND LITHIUM ION SECONDARY BATTERY

摘要

PROBLEM TO BE SOLVED: To provide negative electrode material for a lithium ion secondary battery capable of manufacturing a negative electrode which has high capacity and is excellent in cycle characteristics, to provide a negative electrode using the negative electrode material and the lithium ion secondary battery.SOLUTION: Negative electrode material for a lithium ion secondary battery includes a composite particle A made of a silicon particle and a conductive fine particulate, where ratio r(=t/l) between a longest diameter l and a shortest diameter t of the silicon particle is 0.5 or less.SELECTED DRAWING: None