Poly(Ethylene Oxide) Electrolytes Containing Mixed Salts
Technical rept. 31 May 1991-30 Jun 1992,
PENNSYLVANIA UNIV PHILADELPHIA DEPT OF CHEMISTRY
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An unusual conductivity enhancement occurs in PEO-based ZnBr2LiBr electrolytes of composition, XZnBr21-xLiBrPEO 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 LiBrPEO 16 and one order higher than ZnBr2PEO 16. In contrast, the conductivity of mixed MgC1042LiC104 electrolytes, XMgC104 21-xLiC104PEO16 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, LiC104PEO16. The conductivity and DSC results suggest that the conductivity enhancement in the ZnBr2LiBr electrolytes results from a change in charge carrier type and concentration, whereas the conductivity change in the MgCIO42LiC104 electrolytes arises from a change in the microscopic viscosity of the electrolytes.
- Physical Chemistry