GALVANISCHE FESTELEKTROLYTZELLE

摘要

A galvanic cell with solid electrolyte, which is dischargeable at room temperature and whose positive electrode consists of the metals Sb, Bi, or of the oxides or chalcogenides of these metals, or of mixtures of members of the respective groups, bases its current productive processes upon the formation of a reversible inter-metallic combination between the Sb or Bi and the alkali metal of the negative electrode. The reaction equations are: 3Li+Bi=Li3Bi or (1) 12 Li+Bi2O3=2 Li3Bi+3Li2O (2) A cathode material according to equation (2) is particularly desirable because Bi2O3 has a higher volumetric capacity than Bi, due to the greater electron transition from Bi3+ to Bi3-, thereby yielding higher energy density. In both cases the discharge potential is 0.8 V. As the solid electrolyte, Li3N or Na3Zr2Si2PO12 (Nasicon) can be used.