| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a metallic element-doped silicon oxide powder in which a lithium ion secondary battery having a high capacity and excellent in both initial charge/discharge efficiency and cycle characteristic can be obtained by the use thereof as a negative electrode active material for the above secondary battery. <P>SOLUTION: This metallic element-doped silicon oxide powder is produced by heating a raw material powder mixture containing silicon dioxide powder in the presence of an inert gas or under a reduced pressure within a temperature range of 1,100-1,600°C, generating gaseous silicon oxide, heating the metals or metal compounds except silicon, or the mixture thereof to generate their vaporized gases, and depositing the mixture of the gaseous silicon oxide and vaporized metallic gases on the surface of a substrate cooled to 100-500°C. <P>COPYRIGHT: (C)2003,JPO |
