| 摘要 |
PROBLEM TO BE SOLVED: To provide: a negative electrode active material for a lithium ion secondary battery, capable of providing a lithium ion secondary battery furthermore improved in charge/discharge capacity density and charge/discharge cycle characteristics; a negative electrode mixture for a lithium ion secondary battery; a negative electrode for a lithium ion secondary battery; and a lithium ion secondary battery.SOLUTION: A negative electrode active material for a lithium ion secondary battery comprises a silicon oxide represented by SiO(0<X<2) and a carbon material, and has a void inside thereof. A negative electrode mixture for a lithium ion secondary battery includes the negative electrode active material for a lithium ion secondary battery. |
