The application of Sb2S3 with marvelous theoretical capacity for alkali metal-ion batteries is seriously limited by its poor electrical conductivity and low ini-tial coulombic efficiency(ICE).In this work,natural stibnite modified by carbon dots(Sb2S3@xCDs)is elaborately designed with high ICE.Greatly,chemical processes of local oxidation-partial reduction-deep coupling for stibnite reduction of CDs are clearly demonstrated,confirmed with in situ high-temperature X-ray diffraction.More impressively,the ICE for lithium-ion batteries(LIBs)is enhanced to 85％,through the effect of oxygen-rich carbon matrix on C-S bonds which inhibit the conversion of sulfur to sulfite,well supported by X-ray photoelectron spectroscopy characterization of solid electrolyte interphase layers helped with density functional theory calcula-tions.Not than less,it is found that Sb-O-C bonds existed in the interface effectively promote the electronic conductivity and expedite ion transmission by reducing the bandgap and restraining the slip of the dislocation.As a result,the optimal sample delivers a tremendous reversible capacity of 660 mAh g-t in LIBs at a high current rate of 5 A g-1.This work provides a new methodology for enhancing the electro-chemical energy storage performance of metal sulfides,especially for improving the ICE.

Yinger Xiang;Laiqiang Xu;Li Yang;Yu Ye;Zhaofei Ge;Jiae Wu;Wentao Deng;Guoqiang Zou;Hongshuai Hou;Xiaobo Ji

College of Chemistry and Chemical Engineering,Central South University,Changsha 410083,People's Republic of China;College of Science,Hunan University of Technology and Business,Changsha 410205,People's Republic of China;School of Material Science and Engineering,Zhengzhou University,Zhengzhou 450001,People's Republic of China

纳微快报（英文）

[1]Yinger Xiang;Laiqiang Xu;Li Yang;Yu Ye;Zhaofei Ge;Jiae Wu;Wentao Deng;Guoqiang Zou;Hongshuai Hou;Xiaobo Ji-.Natural Stibnite for Lithium-/Sodium-Ion Batteries:Carbon Dots Evoked High Initial Coulombic Efficiency)[J].纳微快报（英文）,2022(08):208-228

Stibnite,xCDs,Greatly

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