| 摘要 |
PURPOSE:To restrain AC internal resistance by sticking positive and negative electrodes to the inner bottom surfaces of positive and negative electrode cans using conductive paste including colloidal graphite as the principal ingredient, respectively. CONSTITUTION:A positive electrode 2 and a negative electrode 2' are stuck to the inner bottom surface of positive and negative electrode cans 1 and 6 using conductive pastes 3, 3' each including colloidal graphite as the principal ingredient, respectively. Micro particles obtained by pulverizing graphite by impact-abrasion is treated by wet oxidation to come into a colloidal solution, followed by addition of a CMC ammonium salt in a substitution degree of a carboxymethyl group of 0.5-1.0, thus forming paste. The use of the highly adhesive, conductive paste including colloidal graphite as the principal ingredient can restrain any increase in AC internal resistance after storage. |
