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Dynamic Gradient Oxygen Layer Enables Stable Sn Anode for Lithium Storage.

Xi Liu1, Yang Liu1, Zerui Shao2

  • 1Confucius Energy Storage Lab, School of Energy and Environment & Z Energy Storage Center, Southeast University, Nanjing, 211189, P. R. China.

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Summary
This summary is machine-generated.

A novel disordered tin oxide (SnOx) coating on tin (Sn) particles enhances lithium-ion battery anodes. This Sn@SnOx design prevents pulverization and boosts capacity retention for improved energy storage.

Keywords:
Sn‐based anodesdeep lithiationgradient oxygen protectionlithium‐ion batteryoxide layer

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Tin (Sn)-based anodes are promising for lithium-ion batteries due to high capacity and abundance.
  • Challenges include incomplete lithiation, significant volume expansion, and electrode pulverization, limiting performance.

Purpose of the Study:

  • To develop a protective coating for Sn-based anodes to overcome performance limitations.
  • To enhance the stability and electrochemical performance of tin anodes in lithium-ion batteries.

Main Methods:

  • A disordered SnOx (x=1, 2) lamellar coating was rationally designed on Sn particle surfaces (Sn@SnOx).
  • The in-situ formation of a dense, amorphous, mechanical coating with a dynamic oxygen gradient during cycling was investigated.

Main Results:

  • The SnOx coating effectively mitigated volume expansion and reduced lithium consumption through intercalation.
  • An in-situ dynamic gradient oxygen layer provided excellent protection against Sn particle pulverization.
  • The Sn@SnOx anode achieved a high reversible capacity with 84% retention after 900 cycles, promoting deep lithiation to Li4.4Sn.

Conclusions:

  • The gradient oxygen protection mechanism of the SnOx coating is a viable strategy for high-performance lithium storage.
  • This approach offers a new pathway for designing protective coatings on alloy-based anodes.