Abstract
Relationships between the lithium salt concentration in a low-volatility solvent (room-temperature ionic liquid) and lithium secondary battery performance characteristics were investigated by using [LMO positive electrode | DMPIm-TFSA + LiTFSA binary electrolyte | lithium metal negative electrode] cells. Charge/discharge cycle and rate performance characteristics and various changes in resistance (lithium salt concentration and cycle number dependences) were examined, and the necessity of a suitable lithium salt concentration (0.32–0.64 mol kg−1) for good capacity retention and rate capability was concluded.
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