A precursor of nickel-cobalt lithium manganate with core-shell structure, its preparation method and its application in lithium-ion batteries
A technology of nickel-cobalt lithium manganese oxide and core-shell structure, which is applied to the precursor of nickel-cobalt lithium manganese oxide with core-shell structure, its preparation and application in lithium-ion batteries, which can solve the difficulty of coating thickness and uniformity control, The low ionic conductivity of the material affects the electrochemical performance, and the coating process is complicated, so as to achieve the effect of excellent electrochemical performance
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Embodiment 1
[0102] 1. Preparation of nickel-cobalt-manganese carbonate precursor with core-shell structure
[0103] (1) Weigh the sulfate salt of nickel, cobalt, manganese, be mixed with the mixed salt solution A that concentration is 2.5mol / L according to Ni, Co, M molar ratio is 8:1:1, mix solution A, precipitant Na 2 CO 3 solution, complexing agent sodium acetate solution, under continuous stirring, flow into the reactor, so that Ac - :(Ni+Mn+Co)=1:1, Na 2 CO 3 The concentration of the solution is 2.5mol / L, adding the pH regulator NH 4 HCO 3 Solution, the pH value of the solution was adjusted to 8.5, and the inner core precursor slurry M1 was obtained by a controlled crystallization precipitation method.
[0104] (2) Weigh the sulfate salt of nickel, cobalt and manganese, according to Ni, Co, M molar ratio is 6:2:2, be mixed with the mixed salt solution B that concentration is 3.0mol / L, solution B, precipitant Na 2 CO 3 Solution, complexing agent sodium acetate solution, under c...
Embodiment 2
[0117] Except the following content, other methods and conditions are identical with embodiment 1:
[0118] When preparing the core-shell structure nickel-cobalt-manganese carbonate precursor, in the step (1), according to Ni, Co, M molar ratio is 7:1:1 to be mixed with the mixed salt solution A that concentration is 2.5mol / L; Step (2 ) in according to Ni, Co, M molar ratio is 5:3:2, is mixed with the mixed salt solution B that concentration is 3.0mol / L;
[0119] When preparing the nitrogen-doped M element oxide, M=Ce, and the particle size of the cerium oxide is 20nm, and the doping amount of nitrogen in the cerium oxide is 1wt%.
[0120] When preparing the surface-coated nickel-cobalt lithium manganese oxide positive electrode material, in the first coating, the ratio of the total amount of zirconia and titanium oxide to the total amount of nickel, cobalt, and manganese is 0.001:1; The drying temperature is 105°C; the calcination temperature is 950°C, and the calcination ti...
Embodiment 3
[0124] Except the following content, other methods and conditions are identical with embodiment 1:
[0125] When preparing the core-shell structure nickel-cobalt-manganese carbonate precursor, in the step (1), according to Ni, Co, M molar ratio is 7.5:1:1 to be mixed with the mixed salt solution A that concentration is 2.5mol / L; Step (2 ) in according to Ni, Co, M molar ratio is 4:3:3, is mixed with the mixed salt solution B that concentration is 3.0mol / L;
[0126] When preparing the nitrogen-doped M element oxide, M=Mg, and the particle size of the magnesium oxide is 85nm, and the doping amount of nitrogen in the magnesium oxide is 0.5wt%.
[0127] When preparing the surface-coated nickel-cobalt lithium manganese oxide positive electrode material, in the first coating, the ratio of the total amount of zirconia and titanium oxide to the total amount of nickel, cobalt, and manganese is 0.1:1; microwave The drying temperature is 80°C; the calcination temperature is 550°C, and t...
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