Surface-modified lithium nickel cobalt aluminum oxide cathode material and preparation method thereof
A technology of nickel cobalt lithium aluminate and cathode material, which is applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of alkali-enhanced surface crystal structure, unfavorable mass production, micro-cracks of active particles, etc. Improved electrochemical performance, mild and easy control of production conditions, and suppression of surface side reactions
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[0034] Its preparation method comprises the following steps of boron-containing compound and chemical formula are Ni x co y Al z (OH) 2 The ternary precursor of the surface is pre-coated by wet mixing to obtain the precursor of the ternary positive electrode material; the surface pre-coated ternary positive electrode material precursor is mixed with lithium salt, and the surface is modified by high-temperature calcination and then cooling. Nickel cobalt lithium aluminate cathode material.
[0035]Wherein, the boron-containing compound is at least one of ammonium borate, boric acid, diboron trioxide, and lithium metaborate.
[0036] Wherein, the wet mixing is specifically: after mixing the weighed ternary precursor and the boron-containing compound, adding deionized water to obtain a mixed aqueous solution, dissolving at 30-60°C for 0.5-2h under stirring conditions, and raising the temperature to 70°C Continue stirring at ~100°C for 3-8 hours until the water is completely e...
Embodiment 1
[0041] A kind of mixed metal hydroxide Ni with boric acid as boron-containing compound to ternary precursor 0.8 co 0.15 Al 0.05 (OH) 2 (Its SEM image is shown in figure 1 As shown) after surface pre-coating, the surface-modified nickel-cobalt-lithium-aluminate positive electrode material prepared by high-temperature calcination, the preparation method comprises the following steps:
[0042] (1) Preparation of surface pre-coated ternary cathode material precursor
[0043] Add the ternary precursor mixed metal hydroxide and boric acid into the beaker in a molar ratio of 98:2, and then add a certain amount of deionized water, wherein the total content of the mixed metal hydroxide and boric acid is 30%. Stir and dissolve at 40°C for 2 hours, then raise the temperature to 80°C and continue stirring until the water evaporates completely. The resulting mixture was transferred to an oven, and vacuum-dried at 120° C. for 5 h to obtain a ternary cathode material precursor pre-coate...
Embodiment 2
[0047] A kind of mixed metal hydroxide Ni with ammonium borate as boron-containing compound to ternary precursor 0.8 co 0.15 Al 0.05 (OH) 2 After surface pre-coating, the surface-modified nickel-cobalt-lithium-aluminate positive electrode material prepared by high-temperature calcination, the preparation method comprises the following steps:
[0048] (1) Preparation of surface pre-coated ternary cathode material precursor
[0049] Add the ternary precursor mixed metal hydroxide and ammonium borate into the beaker at a molar ratio of 99:1, and then add a certain amount of deionized water, in which the total content of the mixed metal hydroxide and ammonium borate is 20% , stirring and dissolving at 30°C for 1 h, then raising the temperature to 90°C and continuing to stir until the water evaporated completely. The resulting mixture was transferred to an oven, and vacuum-dried at 100° C. for 12 h to obtain a ternary cathode material precursor pre-coated with ammonium borate. ...
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