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Dual-salt assisted synergistic synthesis of Prussian white cathode towards high-capacity and long cycle potassium ion battery

查看全文 作　　者：Rui [1]Ma;Zixing [1]Wang;Qingfeng [1]Fu;Wang [1]Zhou;Ying [1]Mo;Jian [2]Tu;Zhiyong [1,3]Wang;Peng [1]Gao;Changling [1]Fan;Jilei [1]Liu 高影响力作者 机构地区：[1]College of Materials Science and Engineering,Hunan Joint International Laboratory of Advanced Materials and Technology for Clean Energy,Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology,Hunan University,Changsha 410082,Hunan,China;[2]LI-FUN Technology Corporation Limited,Zhuzhou 412000,Hunan,China;[3]Hunan Zhongke Shinzoom Technology Co.,Ltd.,Changsha 410082,Hunan,China高影响力机构 出　　处：《Journal of Energy Chemistry》索引2023年第8期,共9页高影响力期刊 基　　金：financially supported by the National Key Research and Development Program of China (2022YFE0206300);the National Natural Science Foundation of China (U21A2081,22075074, 22209047);Outstanding Young Scientists Research Funds from Hunan Province (2020JJ2004);Major Science and Technology Program of Hunan Province (2020WK2013)。 摘　　要：Prussian blue analogues(PBAs) are considered as superior cathode materials for potassium-ion batteries(PIBs) because of their three-dimensional open framework structure,high stability,and low cost.However,the intrinsic lattice defects and low potassium content typically results in poor rate and cycling performance,thus limited their practical applications.In this work,high-quality K1.64FeFe(CN)6(PW-HQ)material with less crystalline water(6.21%) and high potassium content(1.64 mol^(-1)) was successfully synthesized by a novel coprecipitation method with potassium citrate(K-CA) and potassium chloride(KCl) addition.Specifically,the electrode delivers a reversible capacity of 113.1 mA h g^(-1)at the current rate of 50 mA g^(-1)with~100% coulombic efficiency.Besides,the electrode retained 90% reversible capacity at 500 mA g^(-1)current density after 1000 cycles,indicating only 0.01% capacity decay per cycle.Moreover,we have revealed that the introduction of K-CA controlled the chelating rate of Fe(Ⅱ) and the addition of KCl increased the K+content,hence improving the capacity and stability of the asprepared electrodes.Structural evolution and potassium storage mechanism were further investigated by detailed ex-situ X-ray diffraction and in-situ Raman measurements,which demonstrated reversible potassiation/depotassiation behavior and negligible volume change during the electrochemical process.In general,this work provides an efficient strategy to eliminate water contents in Prussian blue cathode and improve its electrochemical performance,which plays a key role in promoting the industrialization of potassium ion batteries. 关 键 词：Potassium-ionbattery High-qualityK,FeFe(CN)s Potassiumchloride Potassiumcitrate Electrochemical properties
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