Optimize Lithium Deposition at Low Temperature by Weakly Solvating Power Solvent

作者：Tao Ma, Youxuan Ni, Qiaoran Wang, Weijia Zhang, Song Jin, Shibing Zheng, Xian Yang, Yunpeng Hou, Zhanliang Tao, Jun Chen · 发表于：Angewandte Chemie International Edition · 年份：2022 · DOI：10.1002/anie.202207927 · 被引用次数：275 · 研究领域：Advancements in Battery Materials、Advanced Battery Materials and Technologies、Advanced Battery Technologies Research

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.