Dendrite?Free and Stable Lithium Metal Battery Achieved by a Model of Stepwise Lithium Deposition and Stripping

• 作者: Tiancun Liu Jinlong Wang Yi Xu Yifan Zhang Yong Wang
• 来源期刊: 纳微快报（英文版）
• 年，卷（期）: 2021,（11）
• 页码范围: 155-167
• 页数: 13页
• 语种: 英文

摘要

The uncontrolled formation of lithium (Li) dendrites and the unnecessary consumption of electrolyte during the Li plating/stripping process have been major obstacles in developing safe and stable Li metal batteries. Herein, we report a cucumber-like lithiophilic composite skeleton (CLCS) fabricated through a facile oxidationimmersion-reduction method. The stepwise Li deposition and stripping, determined using in situ Raman spectra during the galvanostatic Li charging/discharging process, promote the formation of a dendrite-free Li metal anode. Furthermore, numerous pyridinic N, pyrrolic N, and -CuxN sites with excellent lithiophilicity work synergistically to distribute Li ions and suppress the formation of Li dendrites. Owing to these advantages, cells based on CLCS exhibit a high Coulombic efficiency of 97.3％ for 700 cycles and an improved lifespan of 2000 h for symmetric cells. The full cells assembled with -LiFePO4 (LFP), -SeS2 cathodes and CLCS@Li anodes demonstrate high capacities of 110.1 mAh -g?1 after 600 cycles at 0.2 A -g?1 in CLCS@Li|LFP and 491.8 mAh -g?1 after 500 cycles at 1 A -g?1 in CLCS@Li|SeS2. The unique design of CLCS may accelerate the application of Li metal anodes in commercial Li metal batteries.