Preparation process of lithium manganate composite material with ternary shell layer
A composite material, lithium manganate technology, applied in the direction of electrical components, lithium batteries, active material electrodes, etc., can solve the problems of capacity attenuation, easy dissolution of manganese element, etc., achieve cycle performance and safety performance improvement, inhibit dissolution, particle size evenly distributed effect
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Embodiment 1
[0029] S1. Manganese sulfate and gallium nitrate are dissolved in pure water and mixed to obtain a precursor solution. The molar ratio of manganese ions to gallium ions in the precursor solution is 99.5:0.5, and the concentration of manganese ions to gallium ions is 1mol / L; / L NaOH solution as precipitant, ammonia as complexing agent; adjust the pH of the precipitating agent to 10.65, then add the complexing agent and precursor solution into the precipitating agent and mix and heat in nitrogen atmosphere, the temperature during heating is 60 ℃, to obtain the manganese core precursor Q1;
[0030] S2. Add Q1 to pure water and disperse for 40min to obtain mixture one; according to lithium manganate: the molar ratio of the ternary shell is 5:5 to add the ternary precursor solution to the mixture one; cobalt in the ternary precursor solution Salt, nickel salt and manganese salt are nickel sulfate, cobalt sulfate and manganese sulfate respectively, the molar ratio of nickel ion, cob...
Embodiment 2
[0033] S1. Manganese sulfate and tin nitrate are dissolved in pure water and mixed to obtain a precursor solution. The mol ratio of manganese ions and tin ions in the precursor solution is 98.5:1.5, and the concentration of manganese ions and tin ions is 1mol / L; / L NaOH solution as precipitant and ammonia water as complexing agent; adjust the pH of precipitating agent to 10.95, then add complexing agent and precursor solution into precipitating agent and mix and heat in nitrogen atmosphere, the temperature during heating is 45 ℃, to obtain the manganese core precursor Q1;
[0034]S2. Add Q1 to pure water and disperse for 45min to obtain mixture one; according to lithium manganate: the molar ratio of the ternary shell is 4:6 to add the ternary precursor solution to the mixture one; the cobalt in the ternary precursor solution Salt, nickel salt and manganese salt are nickel sulfate, cobalt sulfate and manganese sulfate respectively, the molar ratio of nickel ion, cobalt ion and ...
Embodiment 3
[0037] S1. Dissolve manganese sulfate and titanium nitrate in pure water and mix to obtain a precursor solution. The molar ratio of manganese ions and titanium ions in the precursor solution is 99.4:0.6, and the concentration of manganese ions and titanium ions is 1.5mol / L; 4mol / L NaOH solution is used as precipitant, ammonia water is used as complexing agent; adjust the pH of precipitating agent to 10.75, then add complexing agent and precursor solution into precipitating agent and mix and heat in nitrogen atmosphere, the temperature during heating is 55°C, the manganese core precursor Q1 was obtained;
[0038] S2. Add Q1 into pure water and disperse for 50min to obtain a mixture one; according to lithium manganate: the molar ratio of the ternary shell is 5.5:4.5 to add the ternary precursor solution to the mixture one; the cobalt in the ternary precursor solution Salt, nickel salt and manganese salt are nickel sulfate, cobalt sulfate and manganese sulfate respectively, the m...
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