Potassium fluoroferrate modified lithium-rich manganese-based layered lithium-ion battery cathode material and preparation method thereof
A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, active material electrodes, positive electrodes, etc., can solve the problems of low conductivity of lithium-rich manganese-based positive electrode materials, prone to side reactions in the electrolyte, poor charge and discharge performance, etc. , to achieve the effects of improving cycle stability, improving capacity fading, poor rate performance, and slow specific capacity
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Embodiment 1
[0061] A lithium-rich manganese-based layered lithium-ion battery cathode material modified by potassium fluoroferrate, the preparation method of which comprises the following steps:
[0062] (1) Dissolve 0.067 mol of manganese acetate, 0.0167 mol of cobalt acetate, and 0.0167 mol of nickel acetate in 20 mL of deionized water in sequence, then add 0.1 mol of citric acid and 0.15 mol of lithium nitrate, then adjust the pH value to 7 with ammonia water, and set the temperature at 80 ° C Heated in a water bath, stirred and reacted for 3 hours to obtain the precursor sol, which was placed in the air and kept at 100°C for 24 hours; finally, the precursor sol was placed in a muffle furnace for heat treatment, and the heat treatment was performed according to the following steps: Calcining time at 450°C for 5 hours, and then calcining at 900°C for 12 hours to obtain a powdery lithium-rich manganese-based layered lithium-ion battery positive electrode material, its chemical formula is:...
Embodiment 2
[0066] A lithium-rich manganese-based layered lithium-ion battery cathode material modified by potassium fluoroferrate, the preparation method of which comprises the following steps:
[0067] (1) Dissolve 0.0467 mol of manganese sulfate, 0.0167 mol of cobalt nitrate, and 0.0167 mol of nickel nitrate in 20 mL of deionized water, then add 0.5 mol of sucrose and 0.95 mol of lithium nitrate, and stir for 3 hours in a water bath at 80°C to obtain the precursor The precursor sol was placed in the air and kept at 100°C for 24 hours; finally, the precursor sol was heat-treated in a muffle furnace. Calcined at ℃ for 12 hours to obtain a powdery lithium-rich manganese-based layered lithium ion battery cathode material, its chemical formula is: 0.9Li 2 MnO 3 0.1LiMn 1 / 3 Ni 1 / 3 co 1 / 3 o 2 .
[0068] (2) Weigh 0.004 mol of ferrous acetate and 0.011 mol of potassium fluoride and dissolve them in 20 mL of deionized water, and stir for 1 hour in a water bath at 50°C for dissolution. ...
Embodiment 3
[0071] A lithium-rich manganese-based layered lithium-ion battery cathode material modified by potassium fluoroferrate, the preparation method of which comprises the following steps:
[0072] (1) Dissolve 0.32 mol of manganese formate, 0.0267 mol of cobalt sulfate, and 0.0.0267 mol of nickel formate in 20 mL of deionized water in sequence, then add 0.8 mol of citric acid, add 0.88 mol of lithium formate, and then adjust the pH value to 9 with ammonia water, and then Under the condition of 80°C water bath, stirring and reacting for 5 hours, the precursor sol was obtained, which was placed in the air, and kept at 100°C for 36 hours; finally, the precursor sol was heat-treated in a muffle furnace, and the heat treatment was performed according to the following steps: first Calcined at 450°C for 5 hours, and then calcined at 900°C for 12 hours to obtain a powdery lithium-rich manganese-based layered lithium-ion battery positive electrode material, whose chemical formula is: 0.1Li ...
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