| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a negative electrode material for a lithium ion secondary battery realizing a lithium ion secondary battery having excellent cycle characteristics and a high level of safety, and inhibited from expanding with charges. <P>SOLUTION: The negative electrode material for a lithium ion secondary battery contains composite particles made by compositing the surfaces of first particles composed of graphite having circularity of 0.60 to 1.00 with second particles containing silicon using a carbonaceous material. <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
