Li Yan-Ni, Jiang Fang-Ling, Sun Zhuang, Yamamoto Osamu, Imanishi Nobuyuki, Zhang Tao
State Key Lab of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, P. R. China.
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, P. R. China.
ACS Appl Mater Interfaces. 2021 Apr 14;13(14):16437-16444. doi: 10.1021/acsami.1c02192. Epub 2021 Mar 31.
Lithium anode protection is an effective strategy to prohibit the continuous loss of redox mediators (RMs) resulting from the unfavorable "shuttle effect" in lithium-oxygen batteries. In this work, an in situ Li anode protection method is designed by utilizing an organic compound, 1-Boc-3-iodoazetidine (BIA), as both a RM and an additive, to form a lithium anode protective layer. The reaction between Li metal and BIA can form lithium iodide (LiI) and lithium-based organometallic. LiI can effectively reduce the charging overpotential. Meanwhile, the in situ-formed anode protection layer (lithium-based organometallic) can not only effectively prevent RMs from being reduced by the lithium metal, but also inhibit the growth of lithium dendrites. As a result, the lithium-oxygen battery with BIA shows a long cycle life of 260 cycles with a notably reduced charging potential. In particular, the battery with BIA achieves an excellent lifespan of 160 cycles at a large current density of 2000 mA g.
锂负极保护是一种有效的策略，可抑制锂氧电池中因不利的“穿梭效应”导致的氧化还原介质（RM）持续损失。在这项工作中，设计了一种原位锂负极保护方法，利用有机化合物1-叔丁氧羰基-3-碘氮杂环丁烷（BIA）作为RM和添加剂，形成锂负极保护层。锂金属与BIA之间的反应可形成碘化锂（LiI）和锂基金属有机化合物。LiI可有效降低充电过电位。同时，原位形成的负极保护层（锂基金属有机化合物）不仅能有效防止RM被锂金属还原，还能抑制锂枝晶的生长。结果，含有BIA的锂氧电池显示出260次循环的长循环寿命，充电电位显著降低。特别是，含有BIA的电池在2000 mA g的大电流密度下实现了160次循环的优异寿命。
