New redox-mediating polymer binder for enhancing performance of Li-S batteries  

作　　者：Soochan Kim Misuk Cho Chalathorn Chanthad Youngkwan Lee 

机构地区：[1]School of Chemical Engineering,Sungkyunkwan University,Suwon 16419,Republic of Korea [2]National Nanotechnology Center(NANOTEC),National Science and Technology Development Agency(NSTDA),Pathum Thani 12120,Thailand

出　　处：《Journal of Energy Chemistry》2020年第5期154-161,共8页能源化学（英文版）

基　　金：the Basic Science Research Program of the National Research Foundation of Korea(NRF)funded by the Ministry of Science and ICT(NRF-2019R1A2C1003594 and NRF-2019R1A2C1003551);the Ministry of Education(NRF-2016R1D1A1B03930806).

摘　　要：Lithium-sulfur(Li-S)batteries are promising energy storage devices owing to their high energy density and the low cost of sulfur.However,they are still far from being applied commercially because of the detrimental capacity fade caused by the dissolution of lithium polysulfide(LPS)in liquid electrolyte.In this study,we introduced a new polymer binder having a redox-mediating function that assists in the reduction of soluble LPS to Li2S at the cathode to suppress the shuttle effect as well as enhance sulfur utilization.An amine group containing benzo(ghi)perylene imide(BPI)was synthesized and grafted onto poly(acrylic acid)to produce a redox-mediating polymer binder.An Li-S cell fabricated using the new redox-mediating polymer binder demonstrated a capacity decay retention of 0.036%per cycle up to 500 cycles at 0.5 C with a coulombic efficiency of 98%.Lithium–sulfur（Li-S） batteries are promising energy storage devices owing to their high energy density and the low cost of sulfur. However, they are still far from being applied commercially because of the detrimental capacity fade caused by the dissolution of lithium polysulfide（LPS） in liquid electrolyte. In this study, we introduced a new polymer binder having a redox-mediating function that assists in the reduction of soluble LPS to Li2S at the cathode to suppress the shuttle effect as well as enhance sulfur utilization. An amine group containing benzo（ghi）perylene imide（BPI） was synthesized and grafted onto poly（acrylic acid） to produce a redox-mediating polymer binder. An Li-S cell fabricated using the new redox-mediating polymer binder demonstrated a capacity decay retention of 0.036% per cycle up to 500 cycles at 0.5 C with a coulombic efficiency of 98%.

关 键 词：Lithium-sulfur battery Redox MEDIATOR BPI BINDER CYCLIC stability 

分 类 号：TQ437[化学工程] TM912[电气工程—电力电子与电力传动]