| 摘要 |
<P>PROBLEM TO BE SOLVED: To greatly improve the low level of an initial efficiency as its shortcoming without impairing the large level of an initial charge capacity which is a characteristic of a lithium secondary battery using SiO as a negative electrode. <P>SOLUTION: A film of a silicon oxide formed by vacuum vapor deposition or sputtering is formed on a surface of a current collector as a negative electrode active material layer. Preferably, the film is formed by an ion plating method. The silicon oxide is SiOx (0.5 ≤ x <1.0), and the thickness of the film is 0.1-50 μm. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
