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Mitigating "Electrostrictive" Coupled-Disruption and Crafting Endogenous Solid-Liquid Interface Toward Mixed
Yian Wang1, Mengting Deng2, Wenbin Fei1
1School of Metallic Materials and Advanced Manufacturing, Soochow University, Suzhou, China.
Advanced Materials (Deerfield Beach, Fla.)
|July 3, 2026
Summary
Introducing halogen elements into sodium iron manganese phosphate materials significantly enhances battery performance by preventing structural degradation and improving ion diffusion. This breakthrough leads to superior rate capability and extended cycle life for advanced energy storage applications.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Sodium iron manganese phosphate (Na4Fe2Mn(PO4)2(P2O7)) shows promise for high energy density but suffers from poor rate capability and cycling stability.
- Performance degradation is linked to "electrostrictive" coupled-disruption closing sodium-ion channels and irregular cathode electrolyte interphase (CEI) growth hindering ion diffusion and causing metal dissolution.
Purpose of the Study:
- To investigate and address the failure mechanisms limiting the electrochemical performance of Na4Fe2Mn(PO4)2(P2O7).
- To enhance the rate capability and cycling stability of this cathode material through defect engineering.
Main Methods:
- Defect engineering by introducing halogen elements (F, Cl, Br) into the Na4Fe2Mn(PO4)2(P2O7) structure.
- Analysis of the effects of halogen incorporation on the material's coordination environment, CEI formation, and electrochemical properties.
Main Results:
- Halogen incorporation effectively suppresses the electrostrictive coupled-disruption by regulating the coordination environment.
- Uniform CEI layers with surface organic-rich and interior inorganic-rich characteristics were formed.
- The modified material achieved high-rate performance (55.0 mAh g-1 at 200 C) and ultra-long cycle stability (98% retention after 20,000 cycles at 50 C).
Conclusions:
- Halogen doping is a viable strategy to overcome the limitations of Na4Fe2Mn(PO4)2(P2O7) for sodium-ion batteries.
- The improved performance is attributed to suppressed structural disruption and optimized CEI layer formation.
- The modified material demonstrates potential for practical applications in high-performance batteries, including full-cell and all-solid-state configurations.
