| abstract |
(57) Abstract: An object of the present invention is to provide a non-aqueous secondary battery of high capacity density, which has a long discharge life and a long discharge life of the negative electrode material. In a non-aqueous secondary battery having a positive electrode and a negative electrode that reversibly store and release an alkali metal, and a non-aqueous electrolyte solution, the negative electrode material is a metal containing a 4B group element and at least one of P and Sb. It consists of a compound and has a crystal structure of C. A non-aqueous secondary battery comprising an aF 2 type, a ZnS type, or an AlLiSi type, wherein the CaF 2 type is an inverse fluorite type or a fluorite type having a lattice constant of 6.36 Å or more. |