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Tuning lithiophilicity and Stability of 3D Conductive Scaffold via Covalent Ag-S Bond for High-Performance lithium Metal Anode

引用

Energy & Environmental Materials 2023年第1期6卷 234-241页

作者： Xue liang li Shaozhuan Huang Dong Yan Jian Zhang Daliang Fang Yew Von lim Ye Wang Tian Chen li Yifan li Lu Guo Hui Ying Yang Pillar of Engineering Product Development Singapore University of Technology and DesignSingapore 487372Singapore Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education South-Central University for NationalitiesWuhan 430074China Key Laboratory of Material Chemistry for Energy Conversion and Storage Ministry of EducationSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhan 430074China Key Laboratory of Material Physics of Ministry of Education School of Physics and MicroelectronicsZhengzhou UniversityZhengzhou 450052China

li metal anode holds great promise to realize high-energy battery ***,the safety issue and limited lifetime caused by the uncontrollable growth of li dendrites hinder its commercial ***,an interlayer-bridged 3D lithiophilic rGO-Ag-S-CNT composite is proposed to guide uniform and stable li plating/*** 3D lithiophilic rGO-Ag-S-CNT host is fabricated by incorporating Ag-modified reduced graphene oxide(rGO)with S-doped carbon nanotube(CNT),where the rGO and CNT are closely connected via robust Ag-S covalent *** strong Ag-S bond could enhance the structural stability and electrical connection between rGO and CNT,significantly improving the electrochemical kinetics and uniformity of current ***,density functional theory calculation indicates that the introduction of Ag-S bond could further boost the binding energy between Ag and li,which promotes homogeneous li nucleation and ***,the rGO-Ag-S-CNT-based anode achieves a lower overpotential(7.3 mV at 0.5 mA cm^(−2)),higher Coulombic efficiency(98.1%at 0.5 mA cm^(−2)),and superior long cycling performance(over 500 cycles at 2 mA cm−2)as compared with the rGO-Ag-CNT-and rGO-CNT-based *** work provides a universal avenue and guidance to build a robust li metal host via constructing a strong covalent bond,effectively suppressing the li dendrites growth to prompt the development of li metal battery.

关键词： Ag-S covalent bond electrochemical performances li dendrite suppression li metal anode

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