| 摘要 |
PROBLEM TO BE SOLVED: To provide a sodium secondary battery excellent in cost performance and cycle characteristics.SOLUTION: The present invention relates to a sodium secondary battery including: a positive electrode containing a material capable of inserting and desorbing sodium ions; a negative electrode containing metallic sodium, a sodium-containing material, or a material capable of inserting and desorbing sodium ions; and an electrolyte having sodium ion conductivity. The material of the positive electrode, capable of inserting and desorbing sodium ions, contains a copper phosphate (Cu(PO)). The positive electrode material may comprise a sodium copper phosphate (NaCuPO). The electrolyte of the present invention is an organic electrolyte containing sodium ions, an aqueous electrolyte, a solid electrolyte, or a polymer electrolyte. |
