Optimize Lithium Deposition at Low Temperature by Weakly Solvating Power Solvent

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…

• NN
  National Natural Science Foundation of China

  Awards: 51771094, 21835004
• NS
  Natural Science Foundation of Tianjin City

  Award: No. 18JCZDJC31500