Electrochemical investigations of novel electrode materials. Final report, August 1, 1977-December 31, 1983
The Group IV and V transition-metal disulfates, e.g. TiS/sub 2/, can easily intercalate alkali-metal atoms as a result of their unusual layered structures. The structural, thermodynamic and transport properties of the lithium and sodium intercalated disulfides have been investigated. Electrochemical-cell techniques have been used to determine the compositional variation of the chemical potential and diffusivity of lithium and sodium in TiS/sub 2/ and TaS/sub 2/. A thermodynamic approach has been 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 has also been derived. The chemical diffusivity model is in good agreement with the experimental results for the Na/sub x/TaS/sub 2/ and Na/sub x/TiS/sub 2/ systems. Two types of multinary intercalation compounds have been investigated. Phase relationships and lithium chemical potentials in the co-intercalated Li/sub x/Na/sub y/TiS/sub 2/, Li/sub x/K/sub y/TiS/sub 2/ and Li/sub x/Ca/sub y/TiS/sub 2/ systems have been determined. Results from these studies have increased our 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/TiS/sub 2/ compounds.
- Research Organization:
- Pennsylvania Univ., Philadelphia (USA). Dept. of Materials Science and Engineering
- DOE Contract Number:
- AC02-77ER04356
- OSTI ID:
- 6702541
- Report Number(s):
- DOE/ER/04356-6; ON: DE84014352
- Country of Publication:
- United States
- Language:
- English
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250903* -- Energy Storage-- Batteries-- Materials
Components
& Auxiliaries
ALKALI METAL COMPOUNDS
ALKALI METALS
CHEMISTRY
ELECTRIC BATTERIES
ELECTROCHEMICAL CELLS
ELECTROCHEMISTRY
ELECTRODES
ELEMENTS
ENERGY TRANSPORT
LITHIUM COMPOUNDS
MATERIALS
METALS
PHYSICAL PROPERTIES
SODIUM COMPOUNDS
STRUCTURAL CHEMICAL ANALYSIS
THERMODYNAMIC PROPERTIES