Abstract
Lithium-ion secondary batteries have the advantages of high energy density and long cycle life and, thus, are expected to serve as energy storage devices for electric vehicles (EVs) and in devices of renewable energy (wind power, solar power, and so on). The safety of lithium-ion secondary batteries is important as battery size increase, and research and development (R&D) in battery safety issues using various electrolyte materials is strongly desired. Solid polymer electrolytes and room-temperature ionic liquids (room-temperature molten salts) have been attracting attention as safe lithium-ion secondary battery electrolytes for large-scale energy storage devices instead of volatile aprotic organic solvents. In this chapter, we describe the R&D of lithium-ion secondary batteries using solid polymer electrolytes and room-temperature ionic liquid electrolytes as highly safe materials.
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