Luo Yu, Peng Jiayu, Yan Youwei
State Key Laboratory of Material Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology Wuhan Hubei 430074 China
RSC Adv. 2021 Sep 27;11(50):31827-31833. doi: 10.1039/d1ra05612c. eCollection 2021 Sep 21.
As advanced electrode materials for sodium ion batteries, Prussian blue and its derivatives have attracted considerable attention due to their low cost, structural stability and facile synthesis process. However, the application of commercially available Prussian blue is limited by its poor electronic conductivity as well as the structural defect induced by crystalline/interstitial water molecules. Herein, to address these drawbacks, an etching-agent free method is developed to synthesize Prussian blue with a hollow structure, and the synthesis mechanism is revealed. Owing to the stability of divalent iron ions, the shorter electron/ion diffusion pathway and fewer defect sites of the hollow structure, the obtained Prussian blue exhibits excellent electrochemical performance (specific capacity of 133.6 mA h g at 1C, 1C = 170 mA g), which can put forward a new avenue to engineer advanced electrode materials for sodium ion batteries.
作为钠离子电池的先进电极材料，普鲁士蓝及其衍生物因其低成本、结构稳定性和简便的合成工艺而备受关注。然而，市售普鲁士蓝的应用受到其较差的电子导电性以及由结晶/间隙水分子引起的结构缺陷的限制。在此，为了解决这些缺点，开发了一种无蚀刻剂的方法来合成具有中空结构的普鲁士蓝，并揭示了其合成机理。由于二价铁离子的稳定性、较短的电子/离子扩散路径以及中空结构较少的缺陷位点，所制备的普鲁士蓝表现出优异的电化学性能（在1C时比容量为133.6 mA h g，1C = 170 mA g），这可为设计用于钠离子电池的先进电极材料提供新途径。
