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Updated: May 31, 2026
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Screening of Coatings for an All-Solid-State Battery Using In Situ Transmission Electron Microscopy
Published on: January 20, 2023
Harnessing High-Pressure CO2 for Molecular-Scale Interfacial Engineering in Sulfide-Based All‑Solid‑State Lithium
Ruyi Fang1,2, Xiaohan Fu1, Xinxu Wang1
1College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou, China.
Advanced Materials (Deerfield Beach, Fla.)
|May 30, 2026
Summary
Engineers used high-pressure carbon dioxide (CO2) to create a protective layer on solid-state battery electrolytes. This innovation enhances battery performance and stability for high-rate applications.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- The low-altitude economy drives demand for high-rate energy storage.
- Sulfide electrolytes are key for all-solid-state batteries (ASSBs) due to high conductivity.
- Interfacial instability and low critical current density limit sulfide ASSB performance.
Purpose of the Study:
- To develop a molecular-level interface engineering strategy for sulfide electrolytes.
- To overcome interfacial instability and enhance the critical current density of ASSBs.
- To improve the high-rate performance and cycling stability of sulfide-based ASSBs.
Main Methods:
- Engineered the Li6PS5Cl (LPSC) surface using high-pressure CO2 in situ.
- Formed a nanoscale Li2CO3-rich layer with enhanced mechanical and oxidative stability.
- Investigated interfacial properties, Li plating/stripping behavior, and full-cell performance.
Main Results:
- Achieved a critical current density of 7.76 mA cm-2 with excellent dendrite suppression.
- Demonstrated stable Li plating/stripping for over 920 hours in symmetric cells.
- Full cells showed high rate capability (5C, 3160 W kg-1) and stable cycling (500 cycles at 0.5C).
Conclusions:
- Molecular-level interface engineering using CO2 is effective for sulfide ASSBs.
- The constructed Li2CO3-rich interphase enhances mechanical integrity and ion flux.
- This strategy successfully addresses power limitations in sulfide-based ASSBs.
