| 摘要 |
PROBLEM TO BE SOLVED: To provide a negative electrode material for lithium secondary battery superior in preservation performance and a lithium secondary battery using the same. SOLUTION: The negative electrode material for lithium secondary battery is made of a La-Si based alloy as expressed LaSi<SB>x</SB>and is made only of LaSi<SB>2-a1</SB>phase or is made of both phases of LaSi<SB>2-a1</SB>phase and LaSi<SB>2-a2</SB>phase, provided that 1.71≤x≤1.86. The negative electrode for lithium secondary battery contains this negative electrode material, and the lithium secondary battery is provided with this negative electrode for lithium secondary battery. COPYRIGHT: (C)2011,JPO&INPIT
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