abstract |
In the present invention, in the XPS analysis of sulfur on the surface of the negative electrode (S2p), a peak of 167 to 171 eV and a peak of 160 to 164 eV exist, and the peak strength of 167 to 171 eV (P169). ) And the peak strength (P162) of 160 to 164 eV (P169 / P162) is in the range of 0.7 to 2.0. |