摘要
Promising room-temperature sodium-sulfur(RT Na-S)battery systems rely on purposely designed highperforming and low-cost electrode materials.Nevertheless,there are the challenges of irreversible dissolution and slow redox kinetics of NaPSs in the complete discharge of sulfur capacity.Herein,engineered CoMoO_(4)in reduced graphene oxide(CoMoO_(4)@rGO)is reported as a class of superior cathode hosts for RT Na-S batteries.The CoMoO_(4)@rGO matrix is designed to facilitate the reversible sodiation and desodiation of sulfur,considering the strong chemisorption between sulfur(and short-chain sodium sulfides)and CoMoO_(4),which alleviates the shuttle effect of sodium sulfides and accelerates the electrochemical reaction rate at RT.The obtained S/CoMoO_(4)@rGO cathode with~52%S loading exhibits a high capacity of520.1 mA h g^(-1)after 100 cycles at 0.1 A g^(-1).Moreover,an enhanced long-term performance at high current densities(212.2 mA h g^(-1)at 4 A g^(-1)over 1000 cycles)with high Coulombic efficiency(~100%)is also achieved.This work demonstrates a novel multifunctional additive for RT Na-S battery cathodes,which is expected to promote the long-waited development towards practical applications of RT Na-S batteries.
基金
the support of the National Natural Science Foundation of China(51971146,51971147,52171218 and 52271222)
the Shanghai Municipal Science and Technology Commission(21010503100 and 20ZR1438400)
the Innovation Program of Shanghai Municipal Education
Commission(No.2019-01-07-00-07-E00015)
the Shanghai Rising-Star Program(20QA1407100 and Yangfan Special Project:23YF1428900)
the support of the Advanced Research and Technology Innovation Centre(ARTIC,Project Number ADT-RP2/A0005947-32-00)for research conducted by John Wang’s group。