Conductivity Enhancement of Polymer-Ceramic Nanoparticle Composite Electrolytes
Abstract
Polymer electrolytes have many advantages for high energy density, rechargeable lithium batteries including low density, ease of manufacture, and ability to accommodate volume changes. Incorporation of ceramic nanoparticles in a poly(ethylene oxide) matrix leads to increased conductivity, lithium ion transport number, and electrode-electrolyte interfacial stability. In order to elucidate the conductivity enhancement mechanism, the composite system has been studied by IR, DSC, and the effect upon conductivity of temperature, thermalization parameters, ceramic particle size and dielectric constant, DC field, and mechanical stretching. The polymer and ceramic phases interact to form a stable, amorphous state. The inclusion of the ceramic phase appears to have a dual effect: the suppression of crystallization and an additional interaction with the polymer phase, believed to be dipolar in nature. At low temperatures(about 20°C) the dipole-dipole interaction is favored, whereas at high temperatures(about 100°C) a reverse trend is observed. Models shall be presented for the dipolar interaction and the resultant conductivity enhancement.
- Publication:
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APS March Meeting Abstracts
- Pub Date:
- March 2002
- Bibcode:
- 2002APS..MARD11007K