| 摘要 |
PROBLEM TO BE SOLVED: To enhance service life characteristics at high temperature by including at least one selected additive from the group of a chelating agent, polyimide resin, chelate resin, ion exchanger, azoles, and its derivative in at least one of a positive electrode and a negative electrode. SOLUTION: An additive contained in a positive electrode or a negative electrode is preferably contained by 0.01-10 vol.% to the volume of an active material of the positive electrode or the negative electrode. As a chelating agent used as the additive, ethylenediaminetetracetic acid is listed. Polyimide resin used is represented by the formula. (In the formula, R1 is a tetravalent organic group, and R2 is a divalent organic group). As chelate resin, resin having a functional group such as iminodiacetate group in a polymer substrate of styrene base is used. As an ion exchanger, a cationic exchange or an amphoteric ion exchange organic or inorganic exchanger is used. As azoles, imidazole is listed. |
