S. Licht
Sep 1, 1987
Citations
0
Influential Citations
27
Citations
Journal
Journal of The Electrochemical Society
Abstract
The aqueous solubility of potassium polysulfide is measured to be 8.5m (64% K/sub 2/S/sub 4/, 36% H/sub 2/O by weight) at 25/sup 0/C, and 11.4m (70% by weight) at 50/sup 0/C. This novel, energetic medium, containing more total sulfur than water, are investigated as high energy density half-cells for secondary electrochemical storage systems, according to K/sub 2/S/sub 4/ + 6e/sup -/ + 6K/sup +/ in equilibrium 4K/sub 2/S. The storage half-cell, contained by a sulfonated styrene and Teflon membrane, is demonstrated to be capable of being cycled at room temperature, with a storage capacity of up to 1.8 x 10/sup 6/ C/kg, operating at currents of over 1A through a 10 cm/sup 2/ thin film CoS electrode with overpotential losses of less than 2 mV/cm/sup 2//mA.