| 摘要 |
PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte secondary battery which has a small initial irreversible capacity and a high initial efficiency and moreover a large discharge capacity, and a negative electrode material of the nonaqueous electrolyte secondary battery which uses a silicon negative electrode active material that gives such battery characteristics as mentioned above. SOLUTION: In a nonaqueous electrolyte secondary battery which houses a positive electrode, a negative electrode, a nonaqueous electrolyte and a separator in a container, the negative electrode is composed of a negative electrode material of the nonaqueous electrolyte secondary battery, which comprises a composition containing 100 pts.wt. of a silicon negative electrode active material prepared by doping an inorganic silicon compound such as a silicon simple substance or a low-grade silicon oxide with an element such as boron or phosphorus, and 100-180 pts.wt. of a conductivity giving material such as acetylene black. |
