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

摘要

PROBLEM TO BE SOLVED: To provide negative electrode material capable of manufacturing a lithium ion secondary battery which has high capacity and is excellent in cycle characteristics, and 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 is a composite particle including a carbonaceous particle and a silicon particle in which ratio r(t/l) between a longest diameter l and a shortest diameter t is 0.5 or less and which is adhered to the carbonaceous particle.SELECTED DRAWING: None