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Zinc oxide (ZnO) addition to all-solid-state batteries with sulfide solid electrolytes (SSEs) effectively suppresses side reactions and gas generation, improving battery capacity and stability for next-generation energy storage.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Solid-State Chemistry

Background:

  • All-solid-state batteries (ASSBs) offer enhanced safety and energy density.
  • Sulfide solid electrolytes (SSEs) exhibit high ionic conductivity, making them promising for ASSBs.
  • Interfacial side reactions between SSEs and cathode active materials (CAMs), along with gas generation, hinder ASSB performance.

Purpose of the Study:

  • To investigate the efficacy of zinc oxide (ZnO) as a protective additive in cathode composite materials for ASSBs.
  • To elucidate the mechanisms by which ZnO mitigates side reactions and gas generation.
  • To understand the impact of ZnO on capacity reduction and internal resistance in ASSBs.

Main Methods:

  • Fabrication of cathode composite materials incorporating zinc oxide (ZnO).
  • Utilizing mass spectrometry to monitor gas generation within the ASSB cell.
  • Employing density functional theory (DFT) calculations to analyze interfacial side reactions and capacity fade mechanisms.

Main Results:

  • ZnO incorporation effectively reduces interfacial side reactions between SSEs and CAMs.
  • ZnO acts as a semiconductor to mitigate electrolyte oxidation and absorbs sulfide-based gases.
  • DFT calculations provide a clear understanding of side reactions and capacity reduction causes.

Conclusions:

  • Zinc oxide is a viable additive for enhancing the stability and performance of sulfide-based ASSBs.
  • Mitigating side reactions and gas generation through ZnO is crucial for improving ASSB longevity and reliability.
  • This study provides fundamental insights into protecting CAMs and maintaining cell integrity in ASSBs.