Superior performance for lithium-ion battery with organic cathode and ionic liquid electrolyte

Organic small structure quinones go with ionic liquids electrolytes would exhibit ultrastable electrochemical properties. In this study, calix[6]quinone (C6Q) cathode was matched with ionic liquid electrolyte Li[TFSI]/[PY13][TFSI] (bis(trifluoromethane)sulfonimide lithium salt/N-methyl-N-propylpyrrolidinium bis(trifluoromethanesulfonyl)amide) to assemble lithium-ion batteries (LIBs). The electrochemical performance of LIBs was systematically studied. The capacity retention rates of C6Q through 1000 cycles at current densities of 0.2 C and 0.5 C were 70% and 72%, respectively. At 5 C, the capacity was maintained at 190 mAh g−1 after 1000 cycles, and 155 mAh g−1 even after 10,000 cycles, comparable to inorganic materials. This work would give a big push to the practical process of organic electrode materials in energy storage.