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

Energy & Environmental Materials

article

Xue Liang Li¹  Shaozhuan Huang²  Dong Yan¹  Jian Zhang³  Daliang Fang¹  Yew Von Lim¹  Ye Wang⁴  Tian Chen Li¹  Yifan Li¹  Lu Guo¹  Hui Ying Yang¹ 

[1] Pillar of Engineering Product Development, Singapore University of Technology and Design;Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education, South-Central University for Nationalities;Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology;Key Laboratory of Material Physics of Ministry of Education, School of Physics and Microelectronics, Zhengzhou University

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

DOI  :  10.1002/eem2.12274

来源: Wiley

【 摘 要 】

Li metal anode holds great promise to realize high-energy battery systems. However, the safety issue and limited lifetime caused by the uncontrollable growth of Li dendrites hinder its commercial application. Herein, an interlayer-bridged 3D lithiophilic rGO-Ag-S-CNT composite is proposed to guide uniform and stable Li plating/stripping. The 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 bond. This 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 distribution. Moreover, 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 growth. Consequently, 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 anodes. This 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.

【 授权许可】

Unknown