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Combating Phase Segregation in Earth-Abundant Pyrite Cathodes for High-Energy-Density Lithium-Metal Batteries
Hongyu Liu1,2, Hao Wang1, Peng Gao3
1School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 611731, China.
Journal of the American Chemical Society
|February 19, 2026
Summary
Researchers developed a novel electrolyte to prevent phase segregation in pyrite (FeS2) cathodes, enabling high energy density and long cycle life for sustainable batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Sustainable electrification requires advanced batteries with high energy density, safety, and sustainable materials.
- Conversion-type battery chemistries offer high energy density but suffer from limited reversibility due to phase segregation and material degradation.
- Pyrite (FeS2) is an earth-abundant material with potential for high-capacity cathodes, but its practical application is hindered by cycling instability.
Purpose of the Study:
- To overcome the fundamental limitations of phase segregation in conversion-type electrodes, specifically using pyrite (FeS2).
- To enhance the reversibility and long-term stability of pyrite cathodes for high-energy-density batteries.
- To demonstrate the practical viability of electrolyte-engineered phase-segregation suppression for sustainable battery technologies.
Main Methods:
- Introduction of a partitioned ionic-cluster electrolyte designed to suppress polysulfide dissolution.
- Investigation of the electrolyte's effect on the nanoscale phase distribution of conversion products during battery cycling.
- Fabrication and testing of scalable pouch cells using the engineered pyrite cathode.
Main Results:
- The partitioned ionic-cluster electrolyte effectively suppressed polysulfide dissolution and phase segregation in the pyrite cathode.
- The modified pyrite cathode achieved a specific energy of ~1300 Wh kg-1 over 500 cycles.
- Exceptional cycling stability was demonstrated, retaining 72.4% capacity after 10,000 cycles at 10C.
- Scalable pouch cells exhibited a competitive energy density of 511 Wh kg-1 and intrinsic safety.
Conclusions:
- Electrolyte-enabled suppression of phase segregation is a critical strategy for unlocking the potential of earth-abundant conversion-type electrodes.
- The developed partitioned ionic-cluster electrolyte enables high performance and stability in pyrite-based batteries.
- This approach paves the way for practical, sustainable, high-energy-density battery solutions.
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