Impact of Lithium-Ion Coordination on Lithium Electrodeposition  

作　　者：Li Sheng Yanzhou Wu Jiekang Tian Li Wang Jianlong Wang Yaping Tang Hong Xu Xiangming He 

机构地区：[1]Institute of Nuclear and New Energy Technology,Tsinghua University,Beijing 100084,China [2]School of Pharmaceutical Sciences,Tsinghua University,Beijing 100084,China [3]Center of Pharmaceutical Technology,Tsinghua University,Beijing 100084,China

出　　处：《Energy & Environmental Materials》2023年第1期177-183,共7页能源与环境材料（英文）

基　　金：This work was funded by the National Natural Science Foundation of China (52073161 and U1564205);the Ministry of Science and Technology of China (No.2019YFE0100200 and 2019YFA0705703);The authors also thank Joint Work Plan for Research Projects under the Clean Vehicles Consortium at U.S.and China-Clean Energy Research Center (CERC-CVC2.0,2016-2020);thank Tsinghua University-Zhangjiagang Joint Institute for Hydrogen Energy and Lithium Ion Battery Technology.

摘　　要：The lithium dendrite and parasitic reactions are two major challenges for lithium(Li)metal anode—the most promising anode materials for high-energy-density batteries.In this work,both the dendrite and parasitic reactions that occurred between the liquid electrolyte and Li-metal anode could be largely inhibited by regulating the Li+-solvation structure.The saturated Li+-solvation species exist in commonly used LiPF 6 liquid electrolyte that needs extra energy to desolvation during Li-electrodeposition.Partial solvation induced high-energy state Li-ions would be more energy favorable during the electron-reduction process,dominating the competition with solvent reduction reactions.The Li-symmetric cells that are cycling at higher temperatures show better performance;the cycled lithium metal anode with metallic lustre and the dendrite-free surface is observed.Theoretical calculation and experimental measurements reveal the existence of high-energy state Li+-solvates species,and their concentration increases with temperature.This study provides insight into the Li+-solvation structure and its electrodeposition characteristics.

关 键 词：Li^(+)-solvates lithium dendrite-free lithium metal anode molecular dynamics parasitic reactions 

分 类 号：TM912[电气工程—电力电子与电力传动]