Optimize Lithium Deposition at Low Temperature by Weakly Solvating Power Solvent. (23rd August 2022)

• Record Type: Journal Article
• Authors: Ma, Tao; Ni, Youxuan; Wang, Qiaoran; Zhang, Weijia; Jin, Song; Zheng, Shibing; Yang, Xian; Hou, Yunpeng; Tao, Zhanliang; Chen, Jun
• Is Part Of: Angewandte Chemie. Volume 134:Number 39(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-08-23
• Subjects: Desolvation Energy -- Lithium Dendrites -- Lithium Metal Batteries -- Low Temperature Electrolyte -- Solvating Power; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.202207927
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: For lithium (Li) metal batteries, the decrease in operating temperature brings severe safety issues by more disordered Li deposition. Here, we demonstrate that the solvating power of solvent is closely related to the reversibility of the Li deposition/stripping process under low‐temperature conditions. The electrolyte with weakly solvating power solvent shows lower desolvation energy, allowing for a uniform Li deposition morphology, as well as a high deposition/stripping efficiency (97.87 % at −40 °C). Based on a weakly solvating electrolyte, we further built a full cell by coupling the Li metal anode with a sulfurized polyacrylonitrile electrode at a low anode‐to‐cathode capacity ratio for steady cycling at −40 °C. Our results clarified the relationship between solvating power of solvent and Li deposition behavior at low temperatures. Abstract : Highly reversible Li plating/stripping behavior at low temperature environment is achieved by accelerating the Li + desolvation process by employing weakly solvating power DMM as electrolyte solvent. As a result, the battery displayed high Li metal coulombic efficiency and avoided dendritic growth from room temperature to −40 °C.