Abstract
The commercialization of lithium-sulfur(Li-S)batteries has been hindered by the shuttle effect and slug-gish redox kinetics of lithium polysulfides(LiPSs).Herein,we reported a viologen-based 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 pro-cess.As a result,the S@TpV-PS cathode exhibits outstanding cycling performance,achieving 300 cycles at 2.0 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.
基金项目
National Natural Science Foundation of China(21825106)
National Natural Science Foundation of China(92061201)
National Natural Science Foundation of China(22205210)
National Natural Science Foundation of China(22171248)
Zhongyuan Thousand Talents(Zhongyuan Scholars)Program of Henan Province(234000510007)
Natural Science Foundation of Henan Province(222300420289)
Zhengzhou University()
NETL
NSTL
万方数据