Co-doped modified lithium ion battery ternary positive electrode material and preparation method thereof
A positive electrode material and co-doping technology, applied in battery electrodes, electrical components, secondary batteries, etc., can solve the problem of not being able to completely compensate for the defects of ternary positive electrode materials, and achieve the purpose of reducing the degree of cation mixing, small specific surface area, and improving Effects of Cyclic Stability
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Embodiment 1
[0033] (1) Lithium nitrate, nickel nitrate, cobalt nitrate and manganese nitrate are weighed according to the molar ratio of 1.05:0.5:0.2:0.3, respectively dissolved and mixed, and then weighed citric acid equivalent to the sum of the moles of metal salts , after dissolving, add the above mixed solution;
[0034] (2) Using ammonia water, adjust the pH of the mixed solution to 7.5, place the mixed solution in a water bath at 85°C, stir and evaporate until a purple sol is formed;
[0035] (3) drying the purple sol obtained in step (2) in a blast oven at 100°C for 12 hours to obtain a precursor;
[0036] (4) Transfer the precursor to a muffle furnace, raise the temperature to 500°C at a heating rate of 5°C / min for pre-sintering for 6 hours, cool to room temperature and grind for 1 hour to obtain the precursor;
[0037] (5) Put the precursor in a muffle furnace, raise the temperature to 850°C at a heating rate of 6°C / min, perform high-temperature calcination in an air atmosphere ...
Embodiment 2
[0041] (1) After lithium nitrate, nickel nitrate, cobalt nitrate, manganese nitrate, aluminum nitrate and ammonium fluoride are weighed according to the molar ratio of 1.06:0.49:0.196:0.294:0.01:0.02, dissolve and mix respectively, then weigh and mix with The citric acid equal to the sum of metal salt moles is added to the above-mentioned mixed solution after dissolving;
[0042] (2) Using ammonia water, adjust the pH of the mixed solution to 7.5, place the mixed solution in a water bath at 85°C, stir and evaporate until a purple sol is formed;
[0043] (3) drying the purple sol obtained in step (2) in a blast oven at 100°C for 12 hours to obtain a precursor;
[0044] (4) Transfer the precursor to a muffle furnace, raise the temperature to 500°C at a heating rate of 4°C / min for pre-sintering for 6 hours, cool to room temperature and grind for 1 hour to obtain the precursor;
[0045] (5) Put the precursor in a muffle furnace, raise the temperature to 850°C at a heating rate of...
Embodiment 3
[0049] (1) After lithium nitrate, nickel nitrate, cobalt nitrate, manganese nitrate, aluminum nitrate and lithium fluoride are weighed according to the molar ratio of 1.03:0.48:0.192:0.288:0.02:0.04, dissolve and mix respectively, then weigh and The citric acid equal to the sum of metal salt moles is added to the above-mentioned mixed solution after dissolving;
[0050] (2) Using ammonia water, adjust the pH of the mixed solution to 7.5, place the mixed solution in a water bath at 85°C, stir and evaporate until a purple sol is formed;
[0051] (3) drying the purple sol obtained in step (2) in a blast oven at 100°C for 12 hours to obtain a precursor;
[0052] (4) Transfer the precursor to a muffle furnace, raise the temperature to 500°C at a heating rate of 5°C / min for pre-sintering for 6 hours, cool to room temperature and grind for 1 hour to obtain the precursor;
[0053] (5) Put the precursor in a muffle furnace, raise the temperature to 850°C at a heating rate of 6°C / min, ...
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