| 摘要 |
PROBLEM TO BE SOLVED: To make the surface state of a carbon material suitable to charging/ discharging, reduce the overvoltage of a host material, and increase the capacity by bonding the surface of the host material with a 7a group element of the periodic table. SOLUTION: Without forming an intercalation complex of a host material, for example, carbon material with fluorine, the surface of the host material is fluorinated to make the surface state of the host material suitable to charging/discharging. The surface of the host material is bonded with a 7a group element of the periodic table, and the element bonded with the surface of the host material is replaced to fluorine or graphite. When the peak position of C15 spectrum of graphite is made 284.3eV in XPS analysis, hetropolar binding fluorine of 685.0eV and covalent bonding fluorine of 687.7eV are obtained. The surface state of the host material is made suitable to charge/discharge, overcharge of the host material is reduced, and the capacity is increased. |
