Promoting high-voltage stability through local lattice distortion of halide solid electrolytes

Abstract Stable solid electrolytes are essential to high-safety and high-energy-density lithium batteries, especially for applications with high-voltage cathodes. In such conditions, solid electrolytes may experience severe oxidation, decomposition, and deactivation during charging at high voltages, leading to inadequate cycling performance and even cell failure. Here, we address the high-voltage limitation of halide solid electrolytes by introducing local lattice distortion to confine the distribution of Cl − , which effectively curbs kinetics of their oxidation. The confinement is realized by substituting In with multiple elements in Li 3 InCl 6 to give a high-entropy Li 2.75 Y 0.16 Er 0.16 Yb 0.16 In 0.25…

• MA
  Materials and Life Science Experimental Facility
• JP
  Japan Proton Accelerator Research Complex
• NN
  National Natural Science Foundation of China

  Awards: U1930102, 11805034, 92163120