Lithium metal is the ultimate anode choice for high energy rechargeable lithium batteries owing to its ultra-high theoretical capacity,however,Li dendrites and low Coulombic efficiency(CE)caused by disor-dered Li plating restrict its practical application.Herein,we develop an ultrathin Sn-decorated Cu sub-strate(Sn@Cu)fabricated by an electroless plating method to induce ordered Li nucleation and growth behavior.The lithiophilic Sn interfacial layer is found to play a critical role to lower the Li nucleation over-potential and promote fast Li-migration kinetics,and the underlying mechanism is revealed using the first principle calculations.Accordingly,a dense dendrite-free and Li deposition with large granular morphology is obtained,which significantly improved the CE and cycling performance of Li‖Sn@Cu half cells symmetric cells.Symmetric cells using the Li-Sn@Cu electrode display a much-prolonged life span(＞1200 h)with low overpotential(～1 8 mV)at a high current density of 1 mA cm-2.Moreover,full cells paired with commercial LiFePO4 cathode(1.8 mAh cm-2)deliver enhanced cycling stability(0.5 C,300 cycles)and excellent rate performance.This work provides a simple and effective way to bring about high efficiency and long lifespan substrates for practical applications.

Lang Ye;Chengyi Zhang;Yin Zhou;Burak ülgüt;Yan Zhao;Jiangfeng Qian

Hubei Key Laboratory of Electrochemical Power Sources,College of Chemistry and Molecular Sciences,Wuhan University,Wuhan 430072,Hubei,China;Institute of Technological Sciences,Wuhan University,Wuhan 430072,Hubei,China;Faculty of Science,Department of Chemistry,Bilkent University,Ankara 06800,Turkey

能源化学

[1]Lang Ye;Chengyi Zhang;Yin Zhou;Burak ülgüt;Yan Zhao;Jiangfeng Qian-.Guided lithium nucleation and growth on lithiophilic tin-decorated copper substrate)[J].能源化学,2022(11):412-419

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