Electrochemical investigations of novel electrode materials
Abstract
The structural, thermodynamic and transport properties of the lithium and sodium intercalated disulfides were investigated. Electrochemical cell techniques were used to determine the compositional variation of the chemical potential and diffusivity of lithium and sodium in TiS2 and TaS2. A thermodynamic approach was used to model the compositional variation of the alkali-metal chemical potential in the intercalated compounds. Using this model, the magnitude of the repulsive interaction energy between intercalated atoms can be estimated. A model which predicts the observed compositional variation of the alkali-metal chemical diffusivity in intercalated compounds was also derived. The chemical diffusivity model is in good agreement with the experimental results for the Na/sub x/TaS2 and Na/sub x/TiS2 systems. Two types of multinary intercalation compounds were investigated. Phase relationships and lithium chemical potentials in the cointercalated Li/sub x/Na/sub y/TiS2, Li/sub x/K/sub y/TiS2 and Li/sub x/Ca/sub y/TiS2 systems were determined. The studies increased the understanding of the significance of ionic size and charge of a second intercalant upon the structure, phase stability and electrochemical properties of Li/sub x/A/sub y/TiS2 compounds.
- Publication:
-
Final Report
- Pub Date:
- June 1984
- Bibcode:
- 1984penn.rept.....W
- Keywords:
-
- Alkali Metals;
- Electrochemistry;
- Electrodes;
- Materials;
- Thermodynamic Properties;
- Electric Batteries;
- Lithium Compounds;
- Sodium Compounds;
- Electronics and Electrical Engineering