Metal-doped modified ternary positive electrode material and preparation method thereof
A positive electrode material and metal technology, which is applied in the field of metal-doped and modified ternary positive electrode materials and its preparation, can solve the problems of reducing material capacity, hindering ion migration, and improving battery polarization, and achieves simple preparation methods and high cycle times. Stability, the effect of inhibiting structural phase transition
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Embodiment 1
[0037] Embodiment 1 (this embodiment doping magnesium ion)
[0038] A kind of ternary cathode material, its chemical formula is LiNi 0.6 co 0.17 mn 0.2 Mg 0.03 o 2 .
[0039] The preparation method of the ternary cathode material comprises the following steps:
[0040] Mix deionized water and ethylene glycol according to a volume ratio of 1:1.2, and stir to obtain a solvent;
[0041] NiSO 4 ·6H 2 O. CoSO 4 ·6H 2 O, MnSO 4 ·H 2 O, MgSO 4 ·6H 2 O is weighed according to the molar ratio of 0.6:0.17:0.2:0.03, and a certain amount of urea is weighed at the same time, wherein MgSO 4 ·6H 2 The mass ratio of O to urea is 1:2, and the above-mentioned weighed raw materials are added to the solvent, and ultrasonically stirred at 40KHz for 30min to obtain a mixed solution with a concentration of 0.02g / mL;
[0042] Transfer the mixed solution to a reaction kettle for heat treatment, the heating temperature is 180°C, and the heating time is 12h;
[0043] After the reaction ...
Embodiment 2
[0047] Embodiment 2 (this embodiment is doped with aluminum ions)
[0048] A kind of ternary cathode material, its chemical formula is LiNi 0.6 co 0.17 mn 0.2 Al 0.03 o 2 .
[0049] The preparation method of the ternary cathode material comprises the following steps:
[0050] Mix deionized water and ethylene glycol according to a volume ratio of 1:1.5, and stir to obtain a solvent;
[0051] NiSO 4 ·6H 2 O. CoSO 4 ·6H 2 O, MnSO 4 ·H 2 O, Al 2 (SO 4 ) 3 18H 2 O is weighed according to the molar ratio of 0.6:0.17:0.2:0.015, and a certain amount of urea is weighed simultaneously, wherein Al 2 (SO 4 ) 3 18H 2 The mass ratio of O to urea is 1:2, and the above-mentioned weighed raw materials are added to the solvent, and ultrasonically stirred at 60KHz for 10min to obtain a mixed solution with a concentration of 0.05g / mL;
[0052] Transfer the mixed solution to the reactor for heat treatment, the heating temperature is 150°C, and the heating time is 15h;
[0053]...
Embodiment 3
[0057] Embodiment 3 (this embodiment is doped with magnesium-aluminum ions)
[0058] A kind of ternary cathode material, its chemical formula is LiNi 0.6 co 0.17 mn 0.2 Mg 0.015 Al 0.015 o 2 .
[0059] The preparation method of the ternary cathode material comprises the following steps:
[0060] Mix deionized water and ethylene glycol according to a volume ratio of 1:1.2, and stir to obtain a solvent;
[0061] NiSO 4 ·6H 2 O. CoSO 4 ·6H 2 O, MnSO 4 ·H 2 O, MgSO 4 ·6H 2 O, Al 2 (SO 4 ) 3 18H 2 O is weighed according to the molar ratio of 0.6:0.17:0.2:0.015:0.0075, and a certain amount of urea is weighed at the same time, wherein MgSO 4 ·6H 2 O and Al 2 (SO 4 ) 3 18H 2 The mass ratio of O to urea is 1:2, the above-mentioned weighed raw materials are added to the solvent, and stirred ultrasonically at 50KHz for 20min to obtain a mixed solution with a concentration of 0.02g / mL;
[0062] Transfer the mixed solution to a reaction kettle for heat treatment, t...
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