Nano azo-coated octahedral lithium manganese nickel oxide composite material and preparation method
A technology of lithium nickel manganese oxide and composite materials, which is applied in the field of new energy materials, can solve the problems that product performance needs to be further optimized and improved, and achieve excellent electrochemical performance, good mechanical and electrochemical performance, and good coating effect
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Embodiment 1
[0025] 1. Dissolve nickel sulfate hexahydrate and manganese sulfate monohydrate in 50mL deionized water according to the mass ratio of nickel to manganese elements of 1:3, and slowly add 1mol / L sodium hydroxide solution to pH at 30°C under vigorous stirring conditions Value is 11, continue to stir at constant temperature for 2 hours, then centrifuge, wash, and dry to obtain the intermediate product precursor;
[0026] 2. Evenly mix the intermediate product precursor obtained in step (1) with the lithium element of lithium carbonate at a molar ratio of 1:1.04, raise the temperature to 500°C at a rate of 5°C / min, and keep it warm for 3 hours; The heating rate of min was increased to 850°C, and the temperature was kept for 20 hours; finally, the temperature was lowered to room temperature at a rate of 2°C / min; after crushing and sieving, an intermediate product of lithium nickel manganese oxide powder with octahedral structure was obtained;
[0027] 3. Using zinc acetate, aluminu...
Embodiment 2
[0030] 1. Dissolve nickel sulfate hexahydrate and manganese sulfate monohydrate in 50mL of deionized water according to the mass ratio of nickel to manganese elements at a ratio of 1:3. Slowly add 1mol / L sodium hydroxide solution to pH at 20°C under vigorous stirring. Value is 12, continue to stir at constant temperature for 3 hours, then centrifuge, wash and dry to obtain the intermediate product precursor;
[0031] 2. Evenly mix the intermediate product precursor obtained in step (1) with the lithium element of lithium carbonate at a molar ratio of 1:1.04, raise the temperature to 400°C at a rate of 4°C / min, and keep it warm for 5 hours; The heating rate of min was raised to 950°C, and the temperature was kept for 15 hours; finally, the temperature was lowered to room temperature at a rate of 4°C / min; after crushing and sieving, an intermediate product of lithium nickel manganese oxide powder with octahedral structure was obtained;
[0032] 3. Using zinc acetate, aluminum ni...
Embodiment 3
[0035] 1. Dissolve nickel sulfate hexahydrate and manganese sulfate monohydrate in 50mL deionized water according to the mass ratio of nickel to manganese elements of 1:3, and slowly add 1mol / L sodium hydroxide solution to pH at 30°C under vigorous stirring conditions Value is 11, continue to stir at constant temperature for 2 hours, then centrifuge, wash, and dry to obtain the intermediate product precursor;
[0036]2. Evenly mix the intermediate product precursor obtained in step (1) with the lithium element of lithium hydroxide monohydrate in a molar ratio of 1:1.1, raise the temperature to 500°C at a rate of 5°C / min, and keep it warm for 3 hours; Raise the temperature at a rate of 2°C / min to 800°C and keep it warm for 25 hours; finally lower it to room temperature at a rate of 2°C / min; crush and sieve to obtain an intermediate product;
[0037] 3. Using zinc nitrate, aluminum nitrate nonahydrate, and citric acid as raw materials, according to Zn 2+ :Al 3+ : Dissolve citr...
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