题目：

Fast-Charging and Ultrahigh-Capacity Lithium Metal Anode Enabled by Surface Alloying

作者：

Tianhui Xu,¹ Peng Gao,¹ Peirong Li,¹ Kai Xia,¹ Na Han,¹ Jun Deng,¹ Yanguang Li,*^,1 and Jun Lu*^,2

单位：

¹Institute of Functional Nano and Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional  Materials and Devices Soochow University Suzhou 215123, China

² Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, IL 60439, USA.

摘要：

Li metal anodes are going through a great revival but they still encounter grand challenges. One often neglected issue is that most reported Li metal anodes are only cyclable under relatively low current density (<5 mA cm^-2) and small areal capacity (<5 mAh cm^-2), which essentially limits their highpower applications and results in ineffective Li utilization (<1%). Herein, it is reported that surface alloyed Li metal anodes can enable reversible cycling with ultrafast rate and ultralarge areal capacity. Low-cost Si wafers are used and are chemically etched down to 20-30 µm membranes. Simply laminating a Si membrane onto Li foil results in the formation of Li_xSi alloy film fused onto Li metal with mechanical robustness and high Li-ion conductivity. Symmetric cell measurements show that the surface alloyed Li anode has excellent cycling stability, even under high current density up to 25 mA cm^-2 and unprecedented areal capacity up to 100 mAh cm^-2. Furthermore, the surface alloyed Li anode is paired with amorphous MoS₃ cathode and achieves remarkable full-cell performance.

影响因子：

24.884

分区情况：

一区

链接：

https://doi/abs/10.1002/aenm.201902343

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