纳米硒化铁/三维多孔碳负极材料的制备及其电化学性能OA

As the negative electrode material for sodium ion batteries,FeSe2 is prone to agglomeration during cycling,leading to a decrease in cycling performance.This problem can be solved by preparing carbon based composite materials.This article uses NaCl as a template and freeze-drying technology to prepare three-dimensional porous carbon(3DPC).At the same time,FeSe2 and FeSe2/3DPC negative electrode materials were prepared by hydrother-mal method.Different proportions of FeSe2/3DPC composite materials were prepared by adjusting the FeSe2 content,and the electrochemical properties of the composite materials were investigated.The results showed that FeSe2/3DPC composite material had better electrochemical performance than FeSe2 and 3DPC.At a rate of 1.0 C,the initial dis-charge specific capacity was 823 mA·h/g,and the reversible discharge specific capacity retention rate was 25.2%after 1 000 cycles.When the mass fraction of FeSe2 is 40%,the material has the highest discharge specific capacity;At the rate of 1.0 C,the reversible discharge specific capacity is 150 mA·h/g after 1 000 cycles,and the electroche-mical performance is optimal.The research results can provide reference for the design of negative electrode materials for sodium ion batteries.