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Inhibiting Phase Transitions of Prussian Blue Analogs with High-Entropy Strategy for Ultralong-Life Sodium-Ion
Shuhui Liu1, Haixia Yu1, Yue Zhao1
1College of Physics, College of Materials Science and Engineering, Weihai Innovation Research Institute, Qingdao University, Qingdao, 266071, China.
Small (Weinheim an Der Bergstrasse, Germany)
|June 4, 2025
Summary
High-entropy Prussian blue analogs (PBAs) overcome capacity decay and poor conductivity. This novel design enhances electrochemical properties, offering stable, high-performance sodium-ion batteries.
Area of Science:
- Materials Science
- Electrochemistry
- Inorganic Chemistry
Background:
- Prussian blue analogs (PBAs) offer a 3D framework and high theoretical capacity for energy storage.
- However, PBAs suffer from poor conductivity and phase transitions, limiting their practical application.
- Existing strategies struggle to simultaneously improve stability and rate performance.
Purpose of the Study:
- To enhance the electrochemical performance of Prussian blue analogs (PBAs) by incorporating the high-entropy (HE) concept.
- To investigate the impact of high-entropy design on structural stability, conductivity, and sodium-ion diffusion.
- To develop a novel high-entropy Prussian blue analog (HEPBA) for advanced sodium-ion batteries.
Main Methods:
- Synthesis of a high-entropy Nax(FeCuNiMgZn)[Fe(CN)6] (HEPBA) by introducing four inert elements.
- Electrochemical characterization including specific capacity, cyclic stability, and rate performance testing.
- Theoretical calculations and experimental analysis to understand structural and electronic properties.
Main Results:
- The synthesized HEPBA demonstrated high specific capacity and excellent cyclic stability over 2000 cycles at 1C.
- Superior rate performance was achieved, indicating improved conductivity and ion diffusion.
- The high-entropy design effectively suppressed phase transitions and enhanced structural integrity.
- Redox activity of Fe centers was activated, and sodium-ion diffusion pathways were optimized.
Conclusions:
- Incorporating the high-entropy concept into PBAs is a viable strategy to improve electrochemical properties.
- HEPBA exhibits enhanced structural stability, superior rate capability, and high specific capacity.
- This approach offers a promising pathway for developing high-performance sodium-ion battery materials.
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