【摘 要】
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LiMnPO4/C materials were prepared by solid state reaction method by using traditional raw materials,surfactant-assisted precipitated NH4MnPO4·H2O as reactants respectively,and the structural and elect
【机 构】
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北京石油化工学院应化系,北京,102617 清华大学核能与新能源技术研究院,北京,100084
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LiMnPO4/C materials were prepared by solid state reaction method by using traditional raw materials,surfactant-assisted precipitated NH4MnPO4·H2O as reactants respectively,and the structural and electrochemical properties of as-prepared materials were characterized by using XRD,SEM,electrochemical impedance spectra(EIS) and charge-discharge tests.The results indicate that using surfactant-assisted precipitated NH4MnPO4·H2O as reactants can decrease remarkably crystalline particle size of LiMnPO4/C to ~30nm.The type of surfactant presents great effects on the agglomerated particles morphology,structure and electrochemical properties.While P123 being used,as-prepared precipitate with small crystal particle size and low agglomeration,can react with Li salt sufficiently to obtain LiMnPO4/C with more pure phase,well-oriented crystal growth and crystallization,more interface area with electrolyte,high Li diffusion rate,better electrochemical performance.It shows a capacity of 116.6 mAh/g at 0.2C,79.8 mAh/g at 5C,and excellent cycling stability at different rates.
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