| 摘要 |
PURPOSE:To facilitate taking out and cleaning of active masses in both electrodes by making a cell an a loop construction and transferring active masses by using an inactive gas, and installing cleaning systems in between. CONSTITUTION:When power is decreased during charge-discharge cycling, a valve 33 is opend, and argon gas is fed to a unit cell 35 from a bomb 31 to recover molten sodium 34 and a sulphur mixture 37 in a sodium tank 26 and a sulphur tank 30 respectively. Then the sodium tank 26 and the sulphur tank 30 are pressurized with argon gas 31 through a valve 32, and thereby impurities in molten sodium which is an anode active mass are removed with a cold trap 38 and the molten sodium is fed to the unit cell 35 again, and impurities in sulphur mixture which is a cathode active mass are removed with a zirconium filter 38 and the molten sulphur is returned to the unit cell 35. By this process, since active masses in both electrodes are purified, almost same electric power as an initial stage is obtained. |
