Method for preparing cathode material lithium nickel cobalt aluminate for lithium ion battery by spray drying
A lithium-nickel-cobalt-aluminate and lithium-ion battery technology, which is applied to battery electrodes, circuits, electrical components, etc., can solve problems such as unsuitability for large-scale industrial production, difficult simultaneous homogeneous precipitation of nickel, cobalt and aluminum, and increased costs. Improved cycle rate performance, better product controllability, and increased production costs
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[0033] Example 1
[0034] According to the molar ratio of Ni:Co:Al of 0.8:0.15:0.05, weigh nickel hydroxide, cobalt oxyhydroxide, aluminum oxide and aluminum fluoride and mix them, and then according to the molar ratio Li:(Ni+Co+Al)=1.05 :1 Add lithium hydroxide and mix, add deionized water to the mixed material according to the liquid-solid mass ratio of 0.25 for sanding. The diameter of the zirconium ball used for sanding is 0.05mm, the host speed is 2000r / min, and the sanding time is 3.5h The D50 of the slurry after sanding is 0.105μm.
[0035] The sand-milled slurry is transferred to a stirred tank for spray drying. By adjusting the feed rate of 600ml / h, the inlet pressure of 0.65MPa, the temperature near the nozzle 220°C, and the outlet temperature of 100°C, the D50 is 8.570μm. The precursor of nickel cobalt lithium aluminate.
[0036] The above-mentioned nickel-cobalt lithium aluminate precursor was sintered in two stages. Firstly, it was sintered in an oxygen flow of 500°C f...
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[0038] Example 2
[0039] According to the molar ratio of Ni:Co:Al of 0.85:0.1:0.05, weigh the nickel carbonate, cobalt carbonate and aluminum oxide and mix them, and then add lithium hydroxide according to the molar ratio Li:(Ni+Co+Al)=1.08:1 Mix, add deionized water to the mixed material according to the liquid-solid mass ratio of 0.30 for sanding. The diameter of the zirconium ball used for sanding is 0.1mm, the host speed is 1800r / min, the sanding time is 3h, and the slurry after sanding is D50. It is 0.132μm.
[0040] The sand-milled slurry is transferred to a stirred tank for spray drying. By adjusting the feed rate of 800ml / h, the inlet pressure of 0.45MPa, the temperature near the nozzle to 250°C, and the outlet temperature of 105°C, the D50 is 11.621μm. The precursor of nickel cobalt lithium aluminate.
[0041] The above-mentioned nickel-cobalt lithium aluminate precursor was sintered in two stages. Firstly, it was sintered at 550°C for 8 hours in an oxygen flow, and then ...
Example Embodiment
[0043] Example 3
[0044] According to the molar ratio of Ni:Co:Al of 0.75:0.2:0.05, weigh the nickel hydroxide, cobalt carbonate, aluminum oxide and aluminum phosphate and mix them, and then according to the molar ratio Li:(Ni+Co+Al)=1.02:1 Add lithium hydroxide to mix, add deionized water to the mixed material according to the liquid-solid mass ratio of 0.20 for sanding. The diameter of the zirconium ball used for sanding is 0.05mm, the host speed is 2200r / min, and the sanding time is 4.5h. The slurry D50 after grinding was 0.086 μm.
[0045] The sand-milled slurry is transferred to a stirred tank for spray drying. By adjusting the feed rate of 300ml / h, the inlet pressure of 0.75MPa, the temperature near the nozzle 190℃, and the outlet temperature of 95℃, the D50 is 5.023μm. The precursor of nickel cobalt lithium aluminate.
[0046] The above-mentioned nickel-cobalt lithium aluminate precursor was sintered in two stages. Firstly, it was sintered in an oxygen flow of 450°C for 8 h...
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