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Alkali-Ion-Assisted Activation of ε-VOPO 4 as a Cathode Material for Mg-Ion Batteries.

Dogancan SariAnn RuttJiyoon KimQian ChenNathan T HahnHaegyeom KimKristin A PerssonGerbrand Ceder
Published in: Advanced science (Weinheim, Baden-Wurttemberg, Germany) (2024)
Rechargeable multivalent-ion batteries are attractive alternatives to Li-ion batteries to mitigate their issues with metal resources and metal anodes. However, many challenges remain before they can be practically used due to the low solid-state mobility of multivalent ions. In this study, a promising material identified by high-throughput computational screening is investigated, ε-VOPO 4 , as a Mg cathode. The experimental and computational evaluation of ε-VOPO 4 suggests that it may provide an energy density of >200 Wh kg -1 based on the average voltage of a complete cycle, significantly more than that of well-known Chevrel compounds. Furthermore, this study finds that Mg-ion diffusion can be enhanced by co-intercalation of Li or Na, pointing at interesting correlation dynamics of slow and fast ions.
Keyphrases
  • ion batteries
  • high throughput
  • solid state
  • quantum dots
  • gold nanoparticles
  • mass spectrometry
  • high resolution
  • single cell
  • water soluble