Enhanced surface stability of K0.27MnO2·0.54 H2O cathode materials with LiF/LixPFyOz coating for potassium-ion batteries
Manganese based oxides have significant potential as cathode materials for potassium ion batteries (PIB). Unfortunately, the practical application of manganese-based oxides is hindered by severe electrode surface erosion from electrolyte decomposition products and material expansion and collapse during potassium ion intercalation. Consequently, the surface modification strategy is adopted herein to uniformly cover the surface of K 0.27 MnO 2 ·0.54 H 2 O (KMO) microspheres with LiF/Li x PF y O z coating to effectively protect the electrode surface and significantly inhibit the collapse of the material crystal structure. Additionally, the coating exhibits excellent electron/ion conductivity, enhancing the diffusion efficiency of potassium ions within the electrode material. The existence of LiF/Li x PF y O z coating is confirmed by characterization measurements. The LiF/Li x PF y O z -coated KMO microspheres (sample LLO@KMO-2) exhibit outstanding cyclic stability (66.3 % capacity retention at 50 mA g −1 ) and high discharge capacity (100.2 mAh g −1 at 50 mA g −1 ), demonstrating their excellent cycle stability. The modification strategy of LiPF 6 -electrolyte-solvothermal coating provides an innovative surface modification method for potassium ion batteries , showcasing its potential for application in future high-performance battery technologies.
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