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

摘要

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-pro pylpyrrolidinium 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.