| 摘要 |
PROBLEM TO BE SOLVED: To provide a secondary nonaqueous battery, which has a large capacity and superior cycle characteristics. SOLUTION: The secondary nonaqueous battery having a negative electrode activator made of a complex material is manufactured, the complex material composed of silicon, silicon compound, or silicon and conductive material, After assembled, the secondary battery is charged at first until a crystalline silicon phase in the negative electrode activator disappears. The secondary battery is further charged once or more in such a way that the potential of the negative electrode becomes higher than that of metal lithium by more than 100 mV at the end of charge. When the conductive material is made of carbon, it is preferable that the complex material composed of silicon and conductive material should be a complex material made by covering part or the whole of the surface of silicon grains or silicon compound grains with carbon. When the conductive material is metal, it is preferable that the complex material composed of silicon and conductive material should be a complex material made by alloying metal with silicon. |
