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

作     者：Rui Ma Zixing Wang Qingfeng Fu Wang Zhou Ying Mo Jian Tu Zhiyong Wang Peng Gao Changling Fan Jilei Liu Rui Ma;Zixing Wang;Qingfeng Fu;Wang Zhou;Ying Mo;Jian Tu;Zhiyong Wang;Peng Gao;Changling Fan;Jilei Liu

作者机构：College of Materials Science and EngineeringHunan Joint International Laboratory of Advanced Materials and Technology for Clean EnergyHunan Province Key Laboratory for Advanced Carbon Materials and Applied TechnologyHunan UniversityChangsha 410082HunanChina LI-FUN Technology Corporation LimitedZhuzhou 412000HunanChina Hunan Zhongke Shinzoom Technology Co.Ltd.Changsha 410082HunanChina 

出 版 物：《Journal of Energy Chemistry》 (能源化学（英文版）)

年 卷 期：2023年第83卷第8期

页      面：16-23,I0003页

核心收录：

学科分类：0808[工学-电气工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

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) 

主　　题：Potassium-ionbattery High-qualityK,FeFe(CN)s Potassiumchloride Potassiumcitrate Electrochemical properties 

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 ***,the intrinsic lattice defects and low potassium content typically results in poor rate and cycling performance,thus limited their practical *** 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) ***,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 ***,the electrode retained 90% reversible capacity at 500 mA g^(-1)current density after 1000 cycles,indicating only 0.01% capacity decay per ***,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 *** 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 *** 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.