High nickel and cobalt-free cathode material and preparation method thereof
A cathode material, high-nickel technology, applied in chemical instruments and methods, nickel compounds, inorganic chemistry, etc., can solve the problems of poor rate performance and cycle performance, lithium-nickel mixed arrangement, etc., to improve rate performance, reduce dissolution, improve The effect of cycle performance
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[0048] according to figure 1 As shown, the preparation method of the high-nickel cobalt-free cathode material provided by the invention comprises:
[0049] (1) In situ growth of Mg-MOF-74 material on the surface of sulfonated polystyrene spheres to obtain Mg-MOF-74@PS;
[0050] (2) Mg-MOF-74@PS is impregnated with a solution containing doping element X to obtain X-Mg-MOF-74@PS;
[0051] (3) With X-Mg-MOF-74@PS as the core, the nickel-manganese precursor is grown in situ to obtain a nickel-manganese precursor with a core-shell structure;
[0052] (4) Mix the above-mentioned nickel-manganese precursor with a lithium source, and lithiate at high temperature to obtain a hollow nickel-manganese binary positive electrode material with gradient doping in the inner layer;
[0053] (5) The above-mentioned nickel-manganese binary cathode material is mixed with ZIF-8, and calcined to obtain a hollow high-nickel cobalt-free cathode material coated with nitrogen-doped graphite carbon.
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Embodiment approach
[0057] According to some embodiments provided by the present invention, the preparation of the Mg-MOF-74@PS includes: dispersing sulfonated polystyrene spheres in a solvent, adding 2,5-dihydroxyterephthalic acid and magnesium salt, and reacting , the reaction is over, the reaction mixture is washed and dried to obtain a template agent with Mg-MOF-74 on the surface of polystyrene microspheres, which is denoted as Mg-MOF-74@PS, and its SEM image is as follows Figure 4 shown.
[0058] In some embodiments, the molar ratio of the 2,5-dihydroxyterephthalic acid to the magnesium salt is 1:2.
[0059] The reaction temperature is 100-150°C, and the reaction time is 12-48h. In some embodiments, the temperature of the reaction is 120° C., and the reaction time is 24 hours.
[0060] In some embodiments, the solvent is a mixed solvent of absolute ethanol, deionized water, and N,N-dimethylformamide (DMF), and the volume ratio of the three is 1:1:1.
[0061] In some embodiments, the dryi...
Embodiment 1
[0118] In this embodiment, the preparation method of the high-nickel cobalt-free positive electrode material includes:
[0119] (1) Disperse 100 g of sulfonated polystyrene spheres in a mixed solvent of absolute ethanol, deionized water, and DMF at a volume ratio of 1:1:1, and add 2,5-dihydroxyl at a molar ratio of 1:2 Terephthalic acid and magnesium sulfate were reacted at 120°C for 24 hours. After the reaction was completed, the reaction mixture was washed and dried in vacuum at 100°C for 12 hours to obtain a template agent with Mg-MOF-74 on the surface of polystyrene microspheres, which was denoted as Mg-MOF -74@PS, wherein the mass ratio of the Mg-MOF-74 to sulfonated polystyrene spheres is 2:1.
[0120] (2) Immerse Mg-MOF-74@PS in 5% sodium metaaluminate aqueous solution for 6 hours, then filter, and vacuum dry at 100°C for 12 hours to obtain Al-Mg-MOF-74@PS, wherein, The molar ratio of Mg-MOF-74 to sodium metaaluminate in Mg-MOF-74@PS is 1:0.5.
[0121] (3) Add water t...
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