Negative and positive ion co-doped monocrystal-like ternary positive electrode material and preparation method thereof
A cathode material, anion and cation technology, applied in the field of single-crystal ternary cathode materials, can solve the problems of low packing density, collapse of secondary spherical particle structure, and degradation of electrochemical performance, so as to achieve uniform distribution of elements and reduce cation mixing degree, the effect of improving cycle stability
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[0022] Example 1
[0023] (1) Precursor preparation: The precursor of the ternary cathode material doped with Zn cations is prepared by the sol-gel method. According to the molar ratio Ni:Co:Al:Zn= 0.78:0.15:0.05:0.02, weigh the acetates of nickel, cobalt, aluminum and zinc and dissolve them in a methanol / ethanol mixed solution, and the mixed solution is continuously carried out at 50°C Stir and slowly add the complexing agent citric acid. After reacting for 12 hours, the mixed solution was kept at 80°C and stirred continuously until the solution completely turned into a dry gel. The dry gel obtained was dried in a vacuum drying oven at 100°C for 24 hours, and the dried powder was calcined in a tube furnace at 750°C for 12 hours in an air atmosphere. The obtained powder was ground and sieved to be ready. The precursor.
[0024] (2) Preparation of single-crystal-like ternary cathode material co-doped with anion and cation. Weigh lithium hydroxide, precursor, and lithium fluoride...
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[0026] Example 2
[0027] (1) Precursor preparation: The precursor of the ternary cathode material doped with Mg cations is prepared by the sol-gel method. According to the molar ratio Ni:Co:Al:Mg= 0.77:0.15:0.05:0.03, weigh the acetates of nickel, cobalt, aluminum, and magnesium and dissolve them in a methanol / ethanol mixed solution. The mixed solution is continuously carried out at 50°C Stir and slowly add the complexing agent citric acid. After reacting for 12 hours, the mixed solution was kept at 80°C and stirred continuously until the solution completely turned into a dry gel. The dry gel obtained was dried in a vacuum drying oven at 100°C for 24 hours, and the dried powder was calcined in a tube furnace at 750°C for 12 hours in an air atmosphere. The obtained powder was ground and sieved to be ready. The precursor.
[0028] (2) Preparation of single-crystal-like ternary cathode material co-doped with anion and cation. Weigh lithium hydroxide, precursor, and lithium fluori...
Example Embodiment
[0029] Example 3
[0030] (1) Precursor preparation: The precursor of the ternary cathode material doped with Zn cations is prepared by the sol-gel method. According to the molar ratio Ni:Co:Al:Zn= 0.79:0.15:0.05:0.01, weigh the acetates of nickel, cobalt, aluminum, and zinc and dissolve them in a methanol / ethylene glycol mixed solution. The mixed solution is kept at 50℃ Stir and slowly add the complexing agent glycolic acid. After reacting for 12 hours, the mixed solution was kept at 80°C and stirred continuously until the solution completely turned into a dry gel. The dry gel obtained was dried in a vacuum drying oven at 100°C for 24 hours, and the dried powder was calcined in a tube furnace at 750°C for 12 hours in an air atmosphere. The obtained powder was ground and sieved to be ready. The precursor.
[0031] (2) Preparation of single-crystal-like ternary cathode material co-doped with anion and cation. Weigh lithium hydroxide, precursor, and lithium chloride according to ...
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