A kind of preparation method of composite positive electrode material for lithium ion battery
A composite positive electrode material and lithium-ion battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of dry powder ball milling that is difficult to uniformly disperse, large specific surface area, and difficult to disperse graphene, and achieve regular shape and high specific capacity , The effect of low raw material cost
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Embodiment 1
[0038] The target is to obtain the product LiMn 0.8 Fe0.2 PO 4 / C Composite. According to the molar ratio (0.8:0.2:1) of Mn, Fe, P in the above chemical formula, weigh manganous sulfate, ferrous sulfate, diammonium hydrogen phosphate, use ethylene glycol as the dispersion medium, and ball mill for 4 hours in a planetary ball mill. 50r / min, autorotation speed 400r / min. The mixture was reacted in a vacuum oven at 50°C for 40 hours, then taken out and washed and filtered repeatedly, and the filter cake was dried at 80°C in a vacuum oven to prepare a ferromanganese ammonium phosphate precursor (see the XRD diagram in figure 1 ). The stoichiometric ratio of ammonium ferromanganese phosphate, lithium carbonate, and glucose are ball-milled and mixed on a planetary ball mill, and anhydrous alcohol is used as a dispersion medium. The mixture was heated to 600°C at a heating rate of 2°C / min under the protection of an argon atmosphere, kept for 5 hours and cooled naturally to obtain ...
Embodiment 2
[0040] The target is to obtain the product LiMn 0.8 Fe 0.2 PO 4 / C@RGO Composites. According to the molar ratio (0.8:0.2:1.05) of Mn, Fe, P in the above chemical formula, weigh manganous sulfate, ferrous sulfate, ammonium phosphate, and simultaneously weigh 1% graphene oxide of mass lithium manganese iron phosphate and ultrasonically disperse it in In organic solvent PEG-400, put it into a planetary ball mill for ball milling for 4 hours, with a revolution speed of 50r / min and an autorotation speed of 400r / min. The mixture was reacted in a vacuum oven at 40°C for 45 hours, then taken out and washed and filtered repeatedly, and the filter cake was dried in a vacuum oven at 80°C. Take the stoichiometric ratio of ferromanganese ammonium phosphate / graphene precursor (NH 4 mn X Fe 1-X PO 4 .H 2 O@RGO), lithium hydroxide, and PVA were ball-milled and mixed on a planetary ball mill, and anhydrous alcohol was used as the dispersion medium. The mixture was heated to 650°C at a...
Embodiment 3
[0042] The target is to obtain the product LiMn 0.8 Fe 0.2 PO 4 / C@RGO Composites. According to the molar ratio (0.8:0.2:1.05) of Mn, Fe, P in the above chemical formula, weigh manganese carbonate, ferrous oxalate, ammonium dihydrogen phosphate, and simultaneously weigh 1% of the mass of lithium manganese iron phosphate graphene oxide Disperse in water, put it into a planetary ball mill for ball milling for 4 hours, the revolution speed is 50r / min, and the rotation speed is 450r / min. The mixture was reacted in a vacuum oven at 40°C for 12 hours, then taken out and washed and filtered repeatedly, and the filter cake was dried in a vacuum oven at 80°C. The ferromanganese ammonium phosphate precursor, lithium hydroxide, and water-soluble starch in a stoichiometric ratio were ball-milled and mixed on a planetary ball mill, and deionized water was used as a dispersion medium. The mixture was heated to 650°C at a heating rate of 2°C / min under the protection of an argon atmospher...
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