| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a negative electrode material for a lithium secondary battery excellent in initial charge-discharge efficiency, and capable of keeping high charge-discharge capacity. <P>SOLUTION: This lithium secondary battery negative electrode material is formed with a particulate silicon constituent (for instance, silicon fine powder having an average particle diameter of 0.01-5 μm) containing 50-100 wt.% of amorphous silicon, and graphite particles. The ratio (weight ratio) of the silicon constituent (A) to the graphite particles (B) may be silicon constituent (A)/graphite particles (B)=99.9/0.1-40/60. The negative electrode material may further contain a carbonaceous binder. When the negative electrode material for a lithium secondary battery containing the particulate silicon constituent (A) and the graphite particles (B) is used, the initial charge-discharge efficiency or the charge-discharge capacity of the lithium secondary battery can be improved. <P>COPYRIGHT: (C)2004,JPO&NCIPI |
