A novel solvothermal synthesis strategy utilizing acetonitrile as a solvent significantly enhances the electrochemical performance of manganese-based Prussian white cathode materials for sodium-ion batteries. In comparative testing, the synthesized material demonstrated substantially improved rate capabilities and long-term cycling endurance compared to cathode materials produced via conventional precipitation routes. By altering the reaction environment away from traditional aqueous media, the researchers succeeded in suppressing destructive structural flaws that typically undermine battery operation. The investigation evaluated the newly developed material against samples synthesized through traditional aqueous co-precipitation, tracking capacity retention, Coulombic efficiency, and specific discharge values across varied current densities. The findings highlight a viable methodology for fabricating high-performance Prussian blue analogues, addressing key material limitations that have hindered practical energy storage applications.
Prussian white has long been regarded as an exceptionally promising cathode candidate for sodium-ion battery technology because of its excellent chemical stability and low-cost resource advantages. However, the practical electrochemical performance of conventional Prussian white has been severely degraded by internal crystalline defects.
To overcome these degradation mechanisms, the research team introduced a solvothermal synthesis approach that replaces traditional aqueous reaction systems with an acetonitrile solvent. This non-aqueous medium effectively regulates both the nucleation and growth kinetics of the material during synthesis, dramatically curtailing crystal defect formation. The resulting manganese-based Prussian white, designated as MnHCF-1, was contrasted directly with MnHCF-2, a reference material prepared using the standard co-precipitation method. Structural and compositional analysis confirmed that MnHCF-1 exhibits high crystallinity, a distinctive non-cuboid nano-bulk morphology, and a notably low water content of less than three weight percent. By avoiding traditional aqueous coprecipitation, the solvothermal process controls crystallization pathways to yield high-quality particles.
Electrochemical evaluations demonstrated that the structural refinements in MnHCF-1 translate directly into superior rate capabilities across varied operational demands. At a current density of 0.5 C, MnHCF-1 delivered an average specific discharge capacity of 106.3 milliampere-hours per gram, consistently outperforming the co-precipitated MnHCF-2 material. As discharge rates intensified, the solvothermally synthesized material maintained higher performance levels, recording average specific discharge capacities of 101.6 milliampere-hours per gram at 1 C, 92.3 milliampere-hours per gram at 2 C, and 75.5 milliampere-hours per gram at 5 C. Even under a demanding current density of 10 C, MnHCF-1 retained an average capacity of 53.4 milliampere-hours per gram. Across every tested current density, MnHCF-1 demonstrated clear capacity advantages over the traditional MnHCF-2 cathode.
The initial cycling efficiency and extended operational endurance of MnHCF-1 likewise revealed substantial advantages over the conventionally prepared counterpart. When tested at a current density of 0.2 C, the solvothermally synthesized cathode achieved a first-cycle discharge specific capacity of 122.7 milliampere-hours per gram alongside a Coulombic efficiency of 97 percent. During prolonged stress testing at a high current density of 5 C, MnHCF-1 retained 58.7 percent of its capacity after completing 2,000 continuous charge-discharge cycles. Throughout this rigorous long-term cycling regimen, the capacity retention of MnHCF-1 remained significantly better than that of MnHCF-2, verifying that defect reduction contributes directly to electrochemical stability under sustained cycling conditions.
Kinetic analyses confirmed that the solvothermal acetonitrile preparation method effectively suppresses crystal defects, reduces charge transfer resistance, and accelerates sodium-ion diffusion kinetics throughout the host structure. These coordinated physical and electrochemical improvements explain the observed enhancements in rate performance and long-term cycle stability. By demonstrating how non-aqueous solvent engineering can effectively suppress crystal defects and regulate growth kinetics, this work provides a new approach for the synthesis of low-defect Prussian blue analogues and promotes the practical application of high-performance cathode materials in sodium-ion batteries.
Subject of Research: Solvothermal synthesis of low-defect manganese Prussian white cathodes for sodium-ion batteries
Article Title: Solvothermal synthesis of Mn-based Prussian white with enhanced electrochemical performance for sodium-ion batteries
Article References: Liu, Y., Song, H., Wang, Y., Liu, K., Qin, Y., Mao, W., Chen, Y., & Bao, K. (2026). Solvothermal synthesis of Mn-based Prussian white with enhanced electrochemical performance for sodium-ion batteries. Ionics. https://doi.org/10.1007/s11581-026-07591-z
Image Credits: AI Generated
DOI: 10.1007/s11581-026-07591-z
Keywords: sodium-ion batteries, Prussian white, solvothermal synthesis, cathode materials, manganese hexacyanoferrate, energy storage, electrochemical performance, crystal defects, Solvothermal, synthesis, Mn-based, Prussian
News Source: Denise Maddox. (November 8, 2026). Solvothermal Method Enhances Manganese Prussian White Performance for Sodium Batteries. Scienmag.
