| 摘要 |
PROBLEM TO BE SOLVED: To provide a large-sized secondary battery at a low cost having an excellent charge/discharge characteristic. SOLUTION: A secondary battery concerned includes a positive electrode active material whose main component is iron complex oxide, which contains alkali metal (A) and is expressed as AyFeXO4 , where A is alkali metal, X is an element belonging to Group IV-VII in the periodic table, and (y) is conditioned as 0<y<2, and a negative electrode active material which is a substance capable of absorbing and releasing alkali metal, alkali earth metal, or their ions. The battery also includes an electrolyte which is a substance allowing the alkali metal ions to make movement for generating electrochemical reactions with the positive or negative electrode active material. |
