Preparation method of lithium-rich manganese-based cathode material with special morphology micro-nano structure
A lithium-rich manganese-based, cathode material technology, applied in nanotechnology, positive electrodes, structural parts, etc. for materials and surface science, can solve the problems of long time, difficult to control product morphology characteristics, high energy consumption, and achieve Improve rate performance, shorten diffusion path and transfer channel effect
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[0028] The invention discloses a method for preparing a lithium-rich manganese-based cathode material with a special morphology and micro-nano structure, which comprises the following steps:
[0029] S1, dissolving manganese salt and nickel salt in distilled water in proportion to obtain liquid A. Dissolve the proportionally weighed homogeneous precipitant in distilled water to obtain liquid B, introduce a certain proportion of ionic liquid into liquid B, stir and mix well. Mix liquid A with mixed liquid B and stir well.
[0030] S2, transfer the mixed liquid into a hydrothermal reaction kettle, conduct a hydrothermal reaction at a certain temperature, and after cooling to room temperature, centrifuge, wash, and dry to obtain a manganese-based precursor material.
[0031] S3, grind and mix the precursor and a certain proportion of lithium carbonate evenly, heat up to a certain temperature in an air atmosphere at a heating rate of 1°C / min for pre-calcination, take it out and g...
Embodiment 1
[0042]Dissolve manganese acetate and nickel acetate with a total concentration of 0.5 mol / L in distilled water at a molar ratio of 3:1 to obtain liquid A. A certain amount of ammonium bicarbonate is dissolved in distilled water, the molar ratio of ammonium bicarbonate to metal ion is 2:1, and 1-butyl-3-methylimidazolium chloride salt of 1g / L is added to the ammonium bicarbonate solution to obtain B liquid. Add liquid B to liquid A drop by drop, and keep stirring to obtain a mixed suspension liquid.
[0043] The above mixed suspension liquid was poured into a 100 mL polytetrafluoroethylene-lined hydrothermal reaction kettle, and placed in an oven at 150° C. for 10 h. After it is naturally cooled to room temperature, it is centrifuged, washed with distilled water and absolute ethanol for several times, and dried to obtain a lithium-rich manganese-based cathode material precursor. Using lithium carbonate as the lithium source, grind and mix the precursor and the lithium source ...
Embodiment 2
[0046] Dissolve manganese acetate and nickel acetate with a total concentration of 0.5 mol / L in distilled water at a molar ratio of 2:1 to obtain liquid A. A certain amount of ammonium bicarbonate is dissolved in distilled water, the molar ratio of ammonium bicarbonate to metal ion is 2:1, and 0.5g / L of 1-butyl-3-methylimidazolium chloride is added to the ammonium bicarbonate solution to obtain Liquid B. Add liquid B to liquid A drop by drop, and keep stirring to obtain a mixed suspension liquid.
[0047] The above-mentioned mixed suspension liquid was poured into a 100 mL polytetrafluoroethylene-lined hydrothermal reaction kettle, and placed in an oven at 60° C. for 20 h. After it is naturally cooled to room temperature, it is centrifuged, washed with distilled water and absolute ethanol for several times, and dried to obtain a lithium-rich manganese-based cathode material precursor. Using lithium carbonate as the lithium source, grind and mix the precursor and the lithium ...
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