Poly(Ethylene Oxide) Electrolytes Containing Mixed Salts
Abstract
An unusual conductivity enhancement occurs in PEO-based ZnBr2/LiBr electrolytes of composition, XZnBr2+(1-x)LiBr(PEO) 16 with x = 0.00, 0.05, 0.50, 0.75, 1.00 in mol%. The conductivity of the mixed-salt electrolytes is higher Ow that of either pure salt electrolyte. The highest conductivity, observed for x = 0.5, is two orders of magnitude higher than that of pure LiBr(PEO) 16 and one order higher than ZnBr2(PEO) 16. In contrast, the conductivity of mixed Mg(C104)2/LiC104 electrolytes, XMg(C104) 2+(1-x)LiC104(PEO)16 where x = 0.00, 0.20, 0.50, 0.80, 1.00 in mol%, increases monotonically with the mole fraction of the higher conductivity component, LiC104(PEO)16. The conductivity and DSC results suggest that the conductivity enhancement in the ZnBr2/LiBr electrolytes results from a change in charge carrier type and concentration, whereas the conductivity change in the Mg(CIO4)2/LiC104 electrolytes arises from a change in the microscopic viscosity of the electrolytes.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 12, 1992
- Accession Number
- ADA254816
Entities
People
- G. C. Farrington
- Hong-Tao Yang
Organizations
- University of Pennsylvania