| 摘要 |
PURPOSE:To eliminate need of a charger, and increase energy density. CONSTITUTION:A secondary battery comprises a positive electrode 6, a negative electrode 7 having a type-n semiconductor part 7c and a metal negative electrode member 7a which are integrally formed, electrolyte 8a including oxidizer and redox ion pairs as positive electrode active material, and a battery case 12 in which the positive electrode 6, negative electrode 7, and electrolyte 8a are contained. The battery case 12 is provided with a light receiving part 12a for applying light to the type-n semiconductor part 7c of the negative electrode 7. The negative electrode 7 is provided with an electrolyte separation film 9 to restrict transmission of the redox ion pairs existing on the side of the type-n semiconductor part 7c to the side of the negative electrode member 7a. Because of this charging by light at the type-n semiconductor part 7c, need of a charger can be eliminated, and because oxygen is used as energy source for oxidizing the negative electrode member for discharging, energy density can be improved. A simple structure of a two-electrode system of the positive electrode and the negative electrode can thus be provided.
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