摘要
The pursuit of highly efficient electrocatalysts is of utmost significance in the relentless drive to enhance the electrochemical performance of lithium-sulfur batteries.These electrocatalysts enable a predominant contribution(~75%)to the overall discharge capacity during cycling by facilitating the rapid conversion of long-chain lithium polysulfides into insoluble short-chain products(Li_(2)S_(2)and Li_(2)S).Herein,high entropy sulfides derived from high entropy metal glycerate templates are synthesized and utilized as electrocatalysts.Among the evaluated materials,high entropy sulfides containing Ni,Co,Fe,Mg,and Ti(GS-3)showcases modulated spherical morphology,uniform elemental distribution,and efficient catalytic properties,outperforming high entropy sulfides containing Ni,Co,Fe,Mg,and Zn(GS-1)and high entropy sulfides containing Ni,Co,Cu,Mg,and Zn(GS-2).Consequently,a typical lithium-sulfur battery incorporating the GS-3/S/KB cathode(S loading~2.3 mg cm^(-2))demonstrates a high initial discharge capacity of~1061 mAh g^(-1)at 0.5 C and stable cycling(1500 cycles)at the lowest capacity decay rate of 0.032%per cycle.The results are superior to the electrochemical performance of GS-1/S/KB(~945 mAh g^(-1),0.034%),GS-2/S/KB(~909 mAh g^(-1),0.086%),and S/KB(~748 mAh g^(-1),0.19%)cells.This work highlights the incorporation of titanium and other metal elements into the sulfide structure,forming high entropy sulfides(i.e.,GS-3)that facilitates efficient catalytic conversion and enhances the cycling performance of lithium-sulfur batteries.
基金
supported by the National Natural Science Foundation of China(52372289,52102368)
the Guangdong Special Fund for key Areas(20237DZX3042)
the Shenzhen Stable Support Project.
