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A Universal Precipitation-Transformation Strategy Toward Low-Defect Prussian Blue Analogs for High-Performance
Shumin Sun1, Peiyuan Wang1,2, Yu Yao3
1College of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou, Henan, People's Republic of China.
Small (Weinheim an Der Bergstrasse, Germany)
|August 5, 2026
Summary
A new synthesis method creates highly crystalline Prussian blue analogs (PBAs) for sodium-ion batteries (SIBs). This cost-effective approach improves PBA performance and stability, paving the way for commercialization in energy storage.
Area of Science:
- Materials Science
- Electrochemistry
- Inorganic Chemistry
Background:
- Prussian blue analogs (PBAs) show promise as low-cost cathode materials for sodium-ion batteries (SIBs) due to their open framework.
- Practical use is limited by defects like vacancies and water, impacting electrochemical performance, and difficult scalable synthesis.
Purpose of the Study:
- To develop a universal, scalable, and cost-effective synthesis strategy for highly crystalline PBAs.
- To overcome the limitations of existing PBA synthesis and improve their electrochemical performance for SIB applications.
Main Methods:
- A precipitation-transformation strategy using insoluble metal compounds as precursors.
- Controlled release of metal ions via dissolution-precipitation equilibrium to manage nucleation and crystal growth.
- Synthesis of diverse PBA compositions (single, binary, multi-metal, high-entropy) and scalable production.
Main Results:
- Achieved highly crystalline PBAs with controllable structures (monoclinic, cubic).
- Demonstrated scalability to 596-gram-level production.
- Optimized Fe-based PBA (T-FeHCF) showed high specific capacity (150.5 mAh g⁻¹ at 0.1 C), excellent rate capability (73.6 mAh g⁻¹ at 20 C), and superior cycling stability (93% retention after 2000 cycles).
- Full cells with hard carbon anodes maintained >85% capacity after 400 cycles.
Conclusions:
- The precipitation-transformation strategy is versatile and scalable for synthesizing high-performance PBAs.
- This cost-effective and eco-friendly method offers a viable route for commercializing advanced PBA cathodes for sustainable energy storage.
