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Chemical Competing Diffusion for Practical All-Solid-State Batteries.

Zhongsheng Dai1, Xuan Sun1, Renjie Chen1,2,3

  • 1Beijing Key Laboratory of Environmental Science and Engineering, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, P. R. China.

Journal of the American Chemical Society
|December 7, 2024
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Summary
This summary is machine-generated.

A novel heteroatom strategy stabilizes Ni-rich cathodes in solid-state batteries by anchoring oxygen and regulating ion diffusion. This enhances cycle life and safety for high-voltage power applications.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-State Batteries

Background:

  • Thermal safety concerns with Ni-rich cathodes necessitate advanced battery designs.
  • Challenges include cascade reactions and chemo-mechanical degradation in current systems.
  • All-solid-state batteries offer a promising alternative for improved safety.

Purpose of the Study:

  • To stabilize Ni-rich cathodes and their interface with solid electrolytes.
  • To elucidate the mechanism of heteroatom-assisted stabilization.
  • To improve the cycle life and performance of sulfide solid-state batteries.

Main Methods:

  • Heteroatom chemical competing diffusion strategy.
  • Theoretical calculations and multiscale in/ex situ characterization.
  • Analysis of atomic-level chemical competing diffusion and topological lithiation.

Main Results:

  • Heteroatoms act as "oxygen anchors" in the bulk, preventing oxygen evolution.
  • Surface-enriched heteroatoms form an ionic "diffusion regulator" with lithium.
  • Piezoelectric layer enhances interface compatibility and weakens the space-charge layer.
  • Designed battery shows 97.3% capacity retention after 120 cycles at 4.5 V.

Conclusions:

  • Heteroatom strategy effectively stabilizes Ni-rich cathodes and solid electrolyte interfaces.
  • Understanding atomic-level diffusion and interface regulation is key to battery performance.
  • This work unlocks structure-function relationships for piezoelectric materials in solid-state batteries.