A kind of preparation method of tin oxide coated cobalt magnesium lithium material
A technology of tin oxide, magnesium lithium, applied in the field of lithium ion batteries, can solve the problems of battery short circuit, irreversible loss of lithium, thermal runaway of large current, etc., achieve high temperature cycle performance and rate performance improvement, improve ion diffusion and conductivity, electrical Chemically stable effect
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Embodiment 1
[0026] A preparation method for a tin oxide-coated cobalt-magnesium-lithium material, comprising the following steps:
[0027] (1) Dissolving cobalt salt and magnesium salt in water, adding a stabilizer, and stirring for 2 hours at 8000 rpm to obtain a mixed solution A;
[0028] (2) Add the mixed solution A obtained in step (1) and the precipitating agent into the reaction vessel at a rate of 0.5 liters / hour and 0.01 liters / hour respectively, and react at a pH of 9 and a temperature of 50°C. The precipitate was purified and heat-set at 50°C, pressure 0-0.1Mpa, oxygen volume percentage 14% in an air atmosphere for 1 hour, and then at 500°C, pressure 0-0.1Mpa, oxygen volume percentage 14% % air atmosphere condition, high temperature reconstruction for 10 hours, cobalt magnesium oxide was prepared;
[0029] (3) Cobalt-magnesium oxide and LiOH·H obtained in step (2) 2 O mixing, adding absolute ethanol, milling in a planetary ball mill for 8 hours, then ultrasonicating for 1 hour...
Embodiment 2
[0032] A preparation method for a tin oxide-coated cobalt-magnesium-lithium material, comprising the following steps:
[0033] (1) Dissolving cobalt salt and magnesium salt in water, adding a stabilizer, and stirring for 5 hours at 10,000 rpm to obtain a mixed solution A;
[0034] (2) Add the mixed solution A obtained in step (1) and the precipitating agent into the reaction vessel at a rate of 5 liters / hour and 3 liters / hour respectively, and react at a pH of 12 and a temperature of 80°C. After purification, the precipitate was heat-set at 130°C, pressure 0-0.1Mpa, oxygen volume percentage 20% in an air atmosphere for 5 hours, and then at 800°C, pressure 0-0.1Mpa, oxygen volume percentage 20% % air atmosphere condition, high temperature reconstruction for 25 hours, cobalt magnesium oxide was prepared;
[0035] (3) Cobalt-magnesium oxide and LiOH·H obtained in step (2) 2 O mixed, and added absolute ethanol, milled in a planetary ball mill for 12 hours, then ultrasonicated fo...
Embodiment 3
[0038] A preparation method for a tin oxide-coated cobalt-magnesium-lithium material, comprising the following steps:
[0039] (1) Dissolving cobalt salt and magnesium salt in water, adding a stabilizer, and stirring for 2.5 hours at 8500 rpm to obtain a mixed solution A;
[0040] (2) Add the mixed solution A obtained in step (1) and the precipitating agent into the reaction vessel at a rate of 1 liter / hour and 0.05 liter / hour respectively, and react at a pH of 10 and a temperature of 55°C. After purification, the precipitate was heat-set at 70°C, pressure 0-0.1Mpa, oxygen volume percentage 15% in an air atmosphere for 2 hours, and then at 550°C, pressure 0-0.1Mpa, oxygen volume percentage 15% % air atmosphere condition, high temperature reconstruction for 13 hours, cobalt magnesium oxide was prepared;
[0041] (3) Cobalt-magnesium oxide and LiOH·H obtained in step (2) 2O mixed, and added absolute ethanol, ball milled in a planetary ball mill for 9h, then ultrasonic 1.2h, co...
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