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

引用

Journal of Energy Chemistry 2023年第8期83卷 16-23,I0003页

作者： Rui Ma Zixing Wang Qingfeng Fu Wang Zhou Ying Mo Jian Tu Zhiyong Wang Peng Gao Changling Fan Jilei Liu College of Materials Science and Engineering Hunan 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 Limited Zhuzhou 412000HunanChina Hunan Zhongke Shinzoom Technology Co. Ltd.Changsha 410082HunanChina

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.

关键词： potassium-ionbattery High-qualityK,FeFe(CN)s potassiumchloride potassiumcitrate Electrochemical properties

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