谭磊博士论文"In-situ tailored 3D Li2O@Cu nanowires array enabling stable lithium metal anode with ultra-high coulombic efficiency"被Journal of Power Sources接收发表
发布时间：2020-04-25
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Suffering from uncontrollable dendrite growth and volume expansion, Li metal batteries have the drawbacks of low coulombic efficiency and short cycle life, which severely limits its practical application. Herein, a multifunctional 3D skeleton of Li2O@Cu composite nanowires array on Cu foam (Li2O@CuNA/CF), in which the Li2O is homogenously distributed onto the Cu nanowires array through the in-situ spontaneous reaction between CuO nanowire and Li metal or electrochemical lithiation of CuO, is designed and serves as lithium storage host for Li metal anode. The lithiophilic Li2O@CuNA provides enough Li nucleation sites for regulating the distribution of Li ions and homogenizing the repeated plating/stripping of Li. The Li2O@CuNA/CF hierarchical structure ensures the rapid charge transfer and inhibits of Li volume expansion. As a result, Li is well accommodated in the Li2O@CuNA/CF skeleton and no distinct Li dendrite is observed. More importantly, the coulombic efficiency is up to 98.5 % after 300 cycles in half-cell. The corresponding Li2O@CuNA/CF/Li symmetric cell exhibits superior stable voltage profile with ultra-low voltage hysteresis (15 mV) for 600 h. This work provides a guide for building a 3D Li2O-metal lithiophilic framework for safe and stable Li anode in Li metal batteries.
