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De-transition-metallization of cathode materials for constructing high-performance solid-state electrolytes in
Mengqi Wu1,2, Meitong Liu1, Xiangyu Yao1
1Key Laboratory of Optic-Electronic Information and Materials of Hebei Province, Hebei Research Center of the Basic Discipline for Computational Physics, College of Physics Science and Technology, Hebei University, Baoding 071002, China. rqlian@126.com.
Physical Chemistry Chemical Physics : PCCP
|July 8, 2025
Summary
Researchers developed new solid-state electrolytes for potassium-ion batteries (KIBs) using a de-transition-metallization strategy. This approach enhances potassium-ion (K+) migration, crucial for efficient grid-scale energy storage and high-performance batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Solid-State Chemistry
Background:
- High-performance solid-state electrolytes (SSEs) are critical for developing potassium-ion batteries (KIBs) for grid-scale energy storage.
- The large ionic radius of K+ presents significant challenges for designing SSEs, unlike those used in lithium- and sodium-ion systems.
- Efficient K+ migration within SSEs is essential for achieving high ionic conductivity and battery performance.
Purpose of the Study:
- To design novel SSEs for KIBs by employing a de-transition-metallization (DTM) strategy.
- To investigate the structural and ionic transport properties of polyanionic KMPO4A derivatives for K+ migration.
- To evaluate the potential of DTM-derived materials for high-safety and high-energy-density KIB applications.
Main Methods:
- Utilized a de-transition-metallization (DTM) strategy, substituting transition metals with main-group elements in KIB cathode structures.
- Employed first-principles calculations to analyze the structural stability, electronic properties, and K+ migration pathways.
- Investigated polyanionic KMPO4A (M = Si, Ge, Sn, Al, Ga, In; A = O/F) derivatives based on the KTiOPO4-type structure.
Main Results:
- DTM strategy yielded thermodynamically stable polyanionic KMPO4A derivatives with high anion coordination for K+.
- Elimination of transition metals widened band gaps (3.13-5.32 eV), ensuring insulating properties while preserving 1D K+ migration channels.
- KMPO4F derivatives exhibited enhanced ionic mobility with low diffusion barriers (<0.15 eV), notably KInPO4F at 0.04 eV, and wide electrochemical windows (4.80 V).
Conclusions:
- The de-transition-metallization (DTM) strategy is a rational and effective approach for designing advanced SSEs for KIBs.
- Polyanionic materials, particularly fluoride-based frameworks like KInPO4F, show significant promise for efficient K+ migration.
- These findings pave the way for developing high-safety and high-energy-density KIBs for energy storage applications.
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