Conduction of lithium ions in polyvinylidene fluoride and its derivatives—I

Abstract

Polymeric solid electrolytes were prepared from the hybrid of poly(vinylidene fluoride) and lithium perchlorate. These were obtained as films having a thickness of about 0.1 mm, and high lithium ionic conductivity [about 10 −5 (S cm −1)] was observed for the hybrid film containing 20 mol% of lithium perchlorate and 30 mol% of propylene carbonate at 40°C. The conductivity depended on the content of lithium perchlorate and additives having high boiling temperature and high dielectric constant. Higher conductivity about 10 −5 (S cm −1) could be obtained by setting a suitable composition of these three components, ie, poly(vinylidene fluoride), lithium perchlorate and additives. Lithium perchlorate was observed to be dispersed homogeneously in the hybrid film with suitable composition from X-ray diffraction measurement. However, an excess of the micro salts were incorporated as micro crystals in polymer matrix.