Effect of channel chemical environment modulation on the performance of lamellar composite electrolyte based lithium-sulfur battery
Three kinds of COFs containing polar groups are prepared,including containing only-C=O,containing both-C=O and-SO3H,and containing both-C=O and-COOH.The COFs nanosheets are obtained after ultrasonic treatment.After low-pressure extraction and filtration,the crown ether is encapsulated into the pore of nanosheets,and three kinds of lamellar composite electrolytes are prepared.The results show that the introduction of dual-polar-group COFs with negative anions can limit the movement of lithium salt anions through electrostatic interactions and further improve the Li+conductivity of electrolyte.The ionic conductivity and lithium ion migration number of COFs containing-COOH are 1.15×10-5 S/cm and 0.64;The ionic conductivity and lithium ion migration number of COFs containg-SO3H are 1.36×10-5 S/cm and 0.71.Compared with the electrolyte prepared with single-polar-group COFs,the ionic conductivity and lithium ion migration number of electrolytes prepared with dual-polar-group COFs are improved.
lithium-sulfur batterylamellar composite solid electrolyteCOFs nanosheetscrown etherlithium ion transfer
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