RECHARGEABLE ELECTROCHEMICAL APPARATUS AND NEGATIVE POLE THEREFOR.

摘要

PCT No. PCT/JP84/00088 Sec. 371 Date Nov. 5, 1984 Sec. 102(e) Date Nov. 5, 1984 PCT Filed Mar. 6, 1984 PCT Pub. No. WO84/03591 PCT Pub. Date Sep. 13, 1984.A rechargeable negative electrode for an electrochemical apparatus using nonaqueous electrolytes, said electrode comprising an alloy comprising (1) at least one metal selected from the group consisting of Sn, Pn, In and Bi and (2) Zn or Zn and Cd, as well as a rechargeable electrochemical apparatus comprising a combination of said negative electrode with a positive electrode having reversibility in charging and discharging. The above-mentioned negative electrode reversibly absorbs and desorbs alkali metal ions, as the result of charge and discharge, in nonaqueous electrolyte containing alkali metal ions. It undergoes no pulverization even after repeated charge and discharge, and maintains its shape stably, so that it has a long charge-and-discharge cycle life. Further, since it can absorb a large quantity of alkali metal per unit volume, it is of high energy density.