Enabling All‐Solid‐State Li Metal Batteries Operated at 30 °C by Molecular Regulation of Polymer Electrolyte

Abstract The low ionic conductivity of poly(ethylene oxide) (PEO)‐based polymer electrolytes at room temperature and the undesired lithium‐dendrite growth at Li|PEO interface impede their further application. Herein, a PEO polymer is regulated at the molecular level through a copper ion (Cu 2+ ) coordination effect with both PEO and Li salts to achieve a high Li + conductivity of 0.2 mS cm −1 and a transference number of 0.42 at 30 °C. Moreover, the Cu‐coordinated PEO electrolyte is neither sticky nor hygroscopic because the hydrophilic oxygen groups in PEO are terminated by Cu ions. Furthermore, the in situ formed F/Li‐rich inorganic layer induced by CuF 2 additive accelerates Li + transport kinetics and…

• NN
  National Natural Science Foundation of China

  Awards: 52231009, 5202780089, 52076089
• FR
  Fundamental Research Funds for the Central Universities

  Award: 2172020kfyXJJS089