IMPROVEMENT OF IONIC CONDUCTIVITY AND MECHANICAL PROPERTIES OF COMPOSITE POLYMER ELECTROLYTES CONTAINING HIGH-ORDERED MESOPOROUS SILICA

摘要

For improvement in ionic conductivity, mesoporous silica (MPS) was used for composite polymer electrolytes as a novel inorganic filler. Internal and framework modification was extended to the MPS. For internal modification, an ionic liquid (IL) was introduced into periodic mesopores of the MPS. The modified MPS (IL-MPS) was filled with PEO{sub}20LiBF{sub}4 complex, and the ionic conductivity and dynamic mechanical properties were measured. The conductivity of PEO{sub}20LiBF{sub}4 was significantly improved by the addition of IL-MPS at room temperature. Storage modulus E' of the composites was also improved. These indicate that the IL-MPS has fast ion-transport channels through the IL-phase and can improve the mechanical strength of the PEO matrix. In addition, mesoporous titanium silicate (Ti-MPS) was prepared and incorporated into the PEO electrolyte as filler.