A spherical surface dense nickel-cobalt-aluminum ternary material, its precursor, its preparation method and application
A ternary material, spherical surface technology, applied in the field of secondary batteries and high-density nickel-cobalt-aluminum oxide, can solve the problem that the cycle performance of nickel-cobalt-aluminum ternary material precursor needs to be further improved, and achieve excellent cycle performance and increase safety. The effect of densification and particle surface densification
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[0034] The preparation method of the spherical surface dense nickel-cobalt-aluminum ternary material precursor (nickel-cobalt-aluminum hydroxide) of the present invention comprises the following steps: 1), the molar ratio Ni / Co / Al is 80:15:5 and weighs soluble nickel source, cobalt source, aluminum source compound, and dissolve nickel source, cobalt source, aluminum source compound in deionized water to prepare a solution with a certain concentration; 2), prepare the solution and complexing agent according to the sum of moles of metal elements : NH 4 + Mix the molar ratio of 0.8 to 2.0, stir evenly, and then flow the solution and the prepared precipitant into the stirring reaction kettle with the primer added, and control the temperature of the reaction system at 25 ~ 85°C, add additives at the same time, control the pH value in the reaction kettle at 8-12, and continue to react for 6-24 hours after the pH value of the reaction system is stable; 3), the obtained nickel-cobalt...
Embodiment 1
[0040] Weigh 100.00g of nickel sulfate, 20.06g of cobalt sulfate, and 7.92g of aluminum sulfate at a molar ratio of Ni / Co / Al of 80:15:5, and dissolve nickel sulfate, cobalt sulfate, and aluminum sulfate in deionized water to prepare a total metal A mixed solution with an ion concentration of 1mol / L; according to the sum of moles of metal elements and NH 4 + The molar ratio is 1.0, and 73.1mL of ammonia water with a mass fraction of 25% is added to the mixed solution; the temperature of the reaction system is controlled at 60°C, and the prepared solution and the prepared precipitant 5mol / L NaOH solution flow into the stirring In the reactor under state, in the reactor, be added with sodium benzenesulfonate as primer liquid, the amount of sodium benzenesulfonate is 0.01% of the reaction solution gross weight; Add additive (SIMULSOL SL 8) 1.5g then, the reactor The pH value in the solution is controlled at 11.0; after the pH value of the reaction system is stable, the reaction i...
Embodiment 2
[0044] Weigh nickel chloride 100.00g, cobalt chloride 18.76g, aluminum chloride 3.51g with molar ratio Ni / Co / Al being 80:15:5, and nickel chloride, cobalt chloride, aluminum chloride are dissolved in Prepare a mixed solution with a total metal ion concentration of 2mol / L in ionized water; 4 + Add ammonium chloride 18.76g to the mixed solution with a molar ratio of 1.5; the temperature of the reaction system is controlled at 55°C, and the prepared solution and the prepared precipitant 2.5mol / L KOH solution flow into the stirring In the reactor, sodium dodecylsulfonate is contained in the reactor as the primer solution, and its addition is 0.03% of the total weight of the reaction solution; then 1.5 g of additive sodium lignosulfonate is added, and the pH value in the reactor is adjusted to Control at 10.5; after the pH value of the reaction system is stable, continue to react for 6 hours; then wash, filter, reslurry, and spray dry the obtained nickel-cobalt-aluminum ternary ma...
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