An Ultrastable Low-Temperature Na Metal Battery Enabled by Synergy between Weakly Solvating Solvents

The low ionic conductivity and high desolvation barrier are the main challenges for organic electrolytes in rechargeable metal batteries, especially at low temperatures. The general strategy is to couple strong-solvation and weak-solvation solvents to give balanced physicochemical properties. However, the two challenges described above cannot be overcome at the same time. Herein, we combine two different kinds of weakly solvating solvents with a very low desolvation energy. Interestingly, the synergy between the weak-solvation solvents can break the locally ordered structure at a low temperature to enable higher ionic conductivity compared to those with individual solvents. Thus, facile desolvation and high…

• NN
  National Natural Science Foundation of China

  Awards: U2004214, 22209152
• CP
  China Postdoctoral Science Foundation

  Award: 2022T150588
• NS
  Natural Science Foundation of Hainan Province

  Award: 232300421081
• NK
  National Key Research and Development Program of China

  Award: 2022YFB2402200