The commercialization of lithium-sulfur(Li-S)batteries has been hindered by the shuttle effect and sluggish redox kinetics of lithium polysulfides(LiPSs).Herein,we reported a viologen-ba sed ionic conjugated mesoporou...The commercialization of lithium-sulfur(Li-S)batteries has been hindered by the shuttle effect and sluggish redox kinetics of lithium polysulfides(LiPSs).Herein,we reported a viologen-ba sed ionic conjugated mesoporous polymer(TpV-Cl),which acts as the cathode host for modifying Li-S batteries.The viologen component serves as a reversible electron conveyer,leading to a comprehensive enhancement in the adsorption of polysulfides and improved conversion rate of polysulfides during the electrochemical process.As a result,the S@TpV-PS cathode exhibits outstanding cycling performance,achieving 300 cycles at2.0 C(1 C=1675 mA g^(-1))with low decay rate of 0.032%per cycle.Even at a high sulfur loading of 4.0 mg cm^(-2),S@TpV-PS shows excellent cycling stability with a Coulombic efficiency of up to 98%.These results highlight the significant potential of S@TpV-PS in developing high-performance Li-S batteries.展开更多
基金supported by the National Natural Science Foundation of China(21825106,92061201,22205210,and 22171248)the Zhongyuan Thousand Talents(Zhongyuan Scholars)Program of Henan Province(234000510007)+1 种基金the Natural Science Foundation of Henan Province(222300420289)Zhengzhou University。
文摘The commercialization of lithium-sulfur(Li-S)batteries has been hindered by the shuttle effect and sluggish redox kinetics of lithium polysulfides(LiPSs).Herein,we reported a viologen-ba sed ionic conjugated mesoporous polymer(TpV-Cl),which acts as the cathode host for modifying Li-S batteries.The viologen component serves as a reversible electron conveyer,leading to a comprehensive enhancement in the adsorption of polysulfides and improved conversion rate of polysulfides during the electrochemical process.As a result,the S@TpV-PS cathode exhibits outstanding cycling performance,achieving 300 cycles at2.0 C(1 C=1675 mA g^(-1))with low decay rate of 0.032%per cycle.Even at a high sulfur loading of 4.0 mg cm^(-2),S@TpV-PS shows excellent cycling stability with a Coulombic efficiency of up to 98%.These results highlight the significant potential of S@TpV-PS in developing high-performance Li-S batteries.
