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Cation-Anion Redox Co-Modulation: Unlocking the Potential of All-Electrochem-Active Sulfur-Based Solid-State
Guoliang Jiang1,2, Xiaolin Xiong1,2, Weiping Li1
1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, China.
Angewandte Chemie (International Ed. in English)
|June 18, 2026
Summary
Researchers developed a novel all-solid-state sulfur cathode using synergistic anion-cation redox chemistry. This breakthrough enhances electrode-level energy density and long-term stability for advanced batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- All-solid-state sulfur cathodes face challenges in capacity utilization due to inactive components.
- The all-electrochemically-active (AEA) electrode concept aims to improve energy density but has limitations.
- Realizing the full potential of sulfur cathodes requires innovative strategies.
Purpose of the Study:
- To develop a new strategy for co-modulating transition-metal cation/sulfur anion redox in sulfur cathodes.
- To unlock the potential of sulfur-based electrodes by enhancing capacity utilization.
- To design an AEA electrode with synergistic anion-cation redox chemistry.
Main Methods:
- Constructed an AEA electrode with S-anion (TiSx, x > 2)/Ti-cation (amorphous TiS2) co-redox.
- Adjusted coordination between S anions and Ti cations to activate sulfur-rich phases.
- Utilized amorphous TiS2 as an active matrix for ionic-electronic conduction.
Main Results:
- Achieved an unprecedented electrode-level energy density of 1829 Wh/kg.
- Sustained an areal capacity of 11.6 mAh/cm2.
- Demonstrated long-term stability exceeding 10,000 hours.
Conclusions:
- The synergistic anion-cation redox design effectively enhances capacity utilization and energy density.
- This approach eliminates inactive components, leading to improved battery performance.
- Validated as a design principle for high-energy-density, long-life all-solid-state battery cathodes.
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