SPECIFIC EFFECT ON LIB ELECTRODES BY FSI- BASED IONIC LIQUID ELECTROLYTES

摘要

The application of ionic liquids (ILs) in Li-ion secondary batteries (LIBs) would ensure safety taking advantage of their lower flammability than conventional organic electrolytes.However, decomposition of ILs on a negative electrode and intercalation of an organic cation, which lead to irreversible Li ~+ insertion/extraction, had been serious problems of losing their charge-discharge capacity. We successfully applied bis(fluorosulfonyl)imide anion (FSI)-based ILs to electrolytes for LIBs, which provide reversible Li-ion insertion/extraction and high efficiency for a graphitized anode without any additives. We have also investigated electrochemical behavior of various anodes in the ILs, e.g., Ni-Si-C composite; the alternative anode also exhibits excellent reversibility in our various FSI-based IL electrolytes.