| 摘要 |
PURPOSE: To impede generation of electrochemical side reaction and obtain almost 100% current efficiency at charge time, by holding a pressure in a negative electrode space constituting a storage battery to a level higher than that of pressure in a positive electrode space. CONSTITUTION: Positive/negative electrode spaces 4, 5 are provided, which are spaced by an alkali metal ion transmitting solid electrolyte 3 and partitioned by a metal housing 2 at least over prescribed region. In the space 4, a cartridge 4K filled with sodium is provided, between the cartridge 4K and the electrolyte 3, also similarly a gap 4A filled with sodium is provided, to constitute an electrochemical storage battery based on sodium and sulfur. In this constitution, a pressure in the negative electrode space 5 is maintained higher than a pressure of the positive electrode space 4, a pressure of the negative electrode space 5 is set higher than a pressure of the gap 4S. Here, in order to high maintain the pressure of the space 5, a sulfur electrode 5S and an additional gas cushion 6 are provided in the space 5, and in the space 5, a compound decomposed at 300 to 350 deg.C is left as stored. |
