Electrochemical cell investigations of LixTiS2 and LixNayTiS2 using a polymer electrolyte
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abstract
Ionic complexes of polymers are a new class of ionic solids which deserve special attention(1). The open-circuit EMF of cell (A) has been measured as a function of composition, x, in LixTiS2 at temperatures between 30 and 100 C. Li/LiC2O2F3 in polyethylene oxide/LixTiS2 (A) The results agree with a previous study(2) in which a liquid organic-solvent electrolyte was used. Thus, the LiC2O2F3-polyethylene oxide complex is a suitable lithium electrolyte for open circuit measurements in this temperature range. Open-circuit EMF's of cell (B) have also been measured for values of x between 0.2 and 0.8. Li/LiC2O2F3 in polyethylene oxide/LixNa0.16TiS2 (B) Some LixNa0.16TiS2 compounds with x between 1.0 and 1.8 have also been prepared, but EMF's of cells using these materials as cathodes were unstable. The measured compositional variation of the lithium chemical potential in LixNa0.16TiS2 is discussed in terms of a recent thermodynamic model(3) to increase the understanding of alkali-metal interactions in intercalated dichalcogenides. The results are also used to calculate a theoretical energy density and to assess the electrode applications of these novel materials. 1981.
