Abstract
Side-Chain Crystalline Block Co-Polymer (SCCBC), which is composed of a side-chain crystalline monomer unit and a functional monomer unit (which can confer solvent-compatibility, polarity, etc.), can be adsorbed to a polyethylene crystal through crystalline supramolecular interaction. By using this interaction, we can modify not only the surface but also the inner pores of a porous polyethylene membrane to give various properties. In this study, we used a monomer with ethylene oxide repeating units as a functional unit, and evaluated its potential as a solid electrolyte for use in a Li ion secondary battery. The properties of the solid electrolyte were excellent compared to those of a non-modified porous membrane at low temperature. In addition, the solid electrolyte did not show temperature-dependence, and the Li+ ion conductivity remained nearly constant throughout the temperature range of 30°C to 60 oC. However, at high temperature (above 70 oC), the conductivity began to decrease. This characteristic may make it useful for sensing temperature and for self-controlling thermal runaway.
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