Nonaqueous Secondary Battery and Negative Electrode Material Therefor

A non-aqueous secondary battery having a long life-time and a high capacity density is provided by increasing the discharging capacity of the negative electrode and extending the life-time of the negative electrode. The nonaqueous secondary battery has a positive electrode and a negative electrode reversibly absorbing and discharging an alkaline metal and a nonaqueous electrolyte, wherein the negative electrode is made of an inter-metallic compound containing at least one element selected from the group consisting of 4A group elements, P and Sb, the inter-metallic compound has any one of CaF2 type, ZnS type and AlLiSi type crystal structures, and the CaF2 type structure is any one an inverse-fluorite structure and a fluorite structure having a lattice constant larger than 6.36 ANGSTROM .