Study on the Preparation of Lithium-Rich Manganese-Based Cathode Material Precursor via Co-Precipitation Method AITranslate

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Chinese Library Classification Number:TM912[电气工程]

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Lithium-rich manganese-based cathode material precursor(Ni_0.35Mn_0.65(OH)₂)was prepared by overflow and dense co-precipitation methods.The effects of nitrogen/oxygen atmosphere,pH value,complexing agent(oxalic acid)concentration,precipitation temperature and aging time on the morphology,internal structure,composition,specific surface area(BET),and tap density(TD)of the precursor were systematically studied.The results indicate that introducing oxygen during the co-precipitation process can promote primary particle size homogenization.Adding oxalic acid complexing agent can slow down the reaction rate and make the precursor more porous.Increasing the precipitation temperature and prolonging the aging time significantly increase the particle size.For the overflow method,an increase in pH value helps to enhance the tap density of the precursor,while the dense method is the opposite.Comparing the two co-precipitation processes of the overflow method and the dense method,the precursor obtained by the overflow method has a larger particle size(2~10μm)and a higher tap density(averaging 1.76 g/cm³),whereas the precursor obtained by the dense method has a finer particle size(2~4μm)and a lower tap density(averaging 1.30 g/cm³).Compared with the overflow method,the dense method shows obvious advantages in the standard deviation of core metrics such as Mn/Ni content,BET and TD,which is conducive to obtaining precursors with higher performance consistency.