| 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 batty including: a positive electrode including a material capable of inserting and releasing sodium ions; a negative electrode including metallic sodium, a sodium-containing material or a material capable of inserting and releasing sodium ions; and an electrolyte having sodium ion conductivity. The material capable of inserting and releasing sodium ions of the positive electrode contains Prussian yellow (Fe[Fe(CN)]). A positive electrode material may be sodium-containing Prussian yellow (NaFe[Fe(CN)] (where, 0<x≤2.0)). The electrolyte of the present invention is an organic electrolyte containing sodium ions or an aqueous electrolyte. |
