Highly reversible lithium metal batteries enabled by spontaneous alloying anode

作者:Liu, Ying; Lin, Li; Sun, Yan; Zhao, Jianxun; Liu, Wanqiang*; Wang, Fang*
来源:Journal of Physics and Chemistry of Solids, 2024, 187: 111871.
DOI:10.1016/j.jpcs.2024.111871

摘要

Emerging lithium metal batteries are one of the candidates for increasing energy density beyond that of traditional lithium -ion batteries. Whereas, intrinsic dendrites growth is a chronic disease severely hampered the application of lithium metal batteries. Hence, partial alloying electrode (LiAl and LiC alloy) with lithiophilic sites and interconnected ion-electron conductive skeleton is presented through repeated folding -rolling strategy. Electrochemical measurement and in situ optical microscopy demonstrate the effectiveness of alloying anode for inhibiting dendrites growth by uniform Li+ flux distribution. The LixMy composite electrode can delivers ultralong cycle life for more than 800 h with negligible overpotential of similar to 10 mV (1 mA cm(-2), 1 mAh cm(-2)). Moreover, the full cell assembled with LiFePO4 cathode exhibited superior rate performance and cycle stability, even at high current density of 2 A g(-1). The availability and scalable method for modifying lithium metal anode provide an essential pace to promoting lithium metal batteries application.