Lithium sulfur battery(LSB) is widely considered as a next-generation battery system due to its high theoretical energy density of 2567 Wh kg-1.However,several inherent issues obstruct the business application of LSB....Lithium sulfur battery(LSB) is widely considered as a next-generation battery system due to its high theoretical energy density of 2567 Wh kg-1.However,several inherent issues obstruct the business application of LSB.To address these issues,we assemble core-shell structure Fe_(3)O_(4)@C nanodots with 5 nm diameter as a valid sulfur host via a convenient organic pyrolysis treatment followed by calcination.The nanosized Fe3O4 particles could expose more chemisorption sites and inhibit the polysulfides shuttle.Moreover,the carbon layer could not only increase the conductivity but also ensure structural integrity during cyclic process.Furthermore,the mesoporous channels around Fe_(3)O_(4)@C could supply sufficient space to load sulfur and physically restrict the shuttle of polysulfides.Thus,the resultant S/Fe_(3)O_(4)@C cathode shows a highly initial capacity of 1089 mAh g^(-1) at 0.2 C,even retains 655 mAh g^(-1) over 200 cycles at 1 C.展开更多
基金financially supported by the National Science Foundation of China(Nos.51772296,21878195,21805018 and 21805198)the Foundation for State Key Laboratory of Biochemical Engineering。
文摘Lithium sulfur battery(LSB) is widely considered as a next-generation battery system due to its high theoretical energy density of 2567 Wh kg-1.However,several inherent issues obstruct the business application of LSB.To address these issues,we assemble core-shell structure Fe_(3)O_(4)@C nanodots with 5 nm diameter as a valid sulfur host via a convenient organic pyrolysis treatment followed by calcination.The nanosized Fe3O4 particles could expose more chemisorption sites and inhibit the polysulfides shuttle.Moreover,the carbon layer could not only increase the conductivity but also ensure structural integrity during cyclic process.Furthermore,the mesoporous channels around Fe_(3)O_(4)@C could supply sufficient space to load sulfur and physically restrict the shuttle of polysulfides.Thus,the resultant S/Fe_(3)O_(4)@C cathode shows a highly initial capacity of 1089 mAh g^(-1) at 0.2 C,even retains 655 mAh g^(-1) over 200 cycles at 1 C.
