Advanced energy materials: application principle and progress of hexaferricyanide Prussian blue materials in sodium / potassium ion batteries

In recent years sodium ion batteries (NIBS) potassium ion batteries (KIBS) have become research hotspots in the field of energy storage due to their abundant raw materials low cost considerable energy / power density. Among many electrode materials Prussian blue (pbas) has a rigid open frame structure a large gap channel (> 3.5 Å) has the comprehensive advantages of easily available raw materials diverse structure composition low synthesis temperature easy scale. Among them hexaferricyanide (HCFs) based on Fe (CN) 6 exhibits high redox potential (2.5 – 3.8 V) specific capacity (70 – 170 MAH g-1) in sodium / potassium ion batteries which is the most studied cathode material among Prussian blue materials one of the most potential low-cost cathode materials in the future.

Zhou Aijun associate professor of School of materials energy of

University of Electronic Science technology Xie Jian associate professor of School of materials science engineering of Zhejiang University Zhang Wuxing associate professor of School of materials science engineering of Huazhong University of science technology published a review paper on HCFs type Prussian blue materials. This paper analyzes the HCFs type Prussian blue materials from the perspective of "cubic monoclinic rhombic" multiphase structure transformation transition metal multi spin state The structural characteristics redox mechanism of HCFs were introduced the differences between HCFs of different alkali transition metals were clarified. The optimization of the material system was systematically reviewed discussed from five aspects: the control of crystallinity the physical chemical separation of crystal water the construction of complex morphology of high specific surface conductive composite surface modification transition metals alkali metal element substitution The principle of sex the main research progress in recent ten years. This paper provides a comprehensive modification idea for the application development of HCFs in low-cost energy storage batteries in the future.

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