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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • High-voltage positive electrode materials in sulfide all-solid-state lithium batteries are limited by the low oxidation potential of sulfide solid-state electrolytes (SSEs).
  • Surface coatings are used to mitigate interfacial reactions, but often react with SSEs, causing degradation and capacity fade.

Purpose of the Study:

  • To develop a stable surface coating for high-voltage positive electrode materials that minimizes reactions with sulfide SSEs.
  • To improve the electrochemical performance and cycling stability of sulfide all-solid-state lithium batteries.

Main Methods:

  • Coating LiCoO₂ positive electrode material with Li₂ZrF₆.
  • Fabricating an all-solid-state lithium battery cell using Li₆PS₅Cl as the SSE.
  • Evaluating the interfacial compatibility and electrochemical performance of the coated electrode.

Main Results:

  • The Li₂ZrF₆ coating showed minimal reaction with the sulfide SSE, and its decomposition products were electron-conductive-free.
  • The coating effectively suppressed the structural transformation of LiCoO₂.
  • The all-solid-state cell achieved high initial areal capacity (5.2 mAh cm⁻²) and 80.5% retention after 1500 cycles at a high mass loading and 3.9 V cut-off voltage.

Conclusions:

  • Li₂ZrF₆ is a promising protective coating for high-voltage positive electrodes in sulfide all-solid-state lithium batteries.
  • This approach enhances interfacial stability and long-term cycling performance, overcoming key limitations in current battery technology.