标题：Synthesis and electrochemical performance of cobalt-doped KMNF3 as cathode materials for potassium ion batteries
作者：Wang, Shuya ;Cui, Bin ;Zhuang, Quanchao ;Shi, Yueli ;Zheng, Hong
作者机构：[Wang, Shuya ;Cui, Bin ] Key Laboratory of Synthetic and Natural Functional Molecule of Ministry of Education, Shanxi Key Laboratory of Physico-Inorga 更多
来源：Journal of the Electrochemical Society
摘要：Manganese-based electrode materials have attracted the attention of researchers of potassium ion batteries because of their resource advantages. In this study, manganese-based fluoride cathode materials for potassium ion batteries KMnF3 and cobalt-doped KMnF3 were synthesized by a co-precipitation method under mild conditions. Solid solution K(Mn,Co)F3 (Mn:Co = 10:1) and composite K(Mn,Co)F3 (Mn:Co = 8:1) were carried out by controlling the amount of doped cobalt and characterized comprehensively. Through the comparison of the synthetic materials, the solid solution K(Mn,Co)F3 was more favorable as a cathode material for potassium ion batteries. Regular changes of the cobalt content in the particles can effectively relieve the dissolution of manganese and improve the cycle performance of the material, so that the material still maintained a high charge capacity and discharge capacity after 60 cycles at current density of 40 mA g−1 over the voltage range 4.2–1.2 V vs. K/K+. Electrochemical impedance spectroscopy (EIS) during the initial charging process was used to visually reflect the interfacial reaction process during potassium ion insertion and extraction.
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