Method for preparing lithium nickel manganese oxide, anode material and lithium ion battery
A technology of lithium nickel manganate and amines, applied in the field of batteries, can solve the problems such as the need to improve the tap density of lithium nickel manganate and poor electrochemical performance, and achieve improved electrochemical performance, high tap density and good electrochemical performance. performance effect
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[0032] The invention provides a kind of preparation method of lithium nickel manganese oxide, comprising:
[0033] Under the action of amine complexing agent, precipitating agent and ammonia water, the mixed solution formed by nickel salt and manganese salt is subjected to co-precipitation reaction to obtain Ni 0.5 mn 1.5 (OH) 4 ; The amine complexing agent includes diethylenetriamine, triethylenetetramine, isopropylamine, ethylenediamine, triethanolamine or hydrazine;
[0034] will Ni 0.5 mn 1.5 (OH) 4 Carrying out calcination to obtain a calcined product, the temperature of the calcination is 550°C to 850°C;
[0035] The calcined product and the lithium compound are raised from a first temperature to a second temperature at a first speed; then reacted at a second speed from a second temperature to a third temperature to obtain lithium nickel manganese oxide; the first speed 10°C / min to 20°C / min, and the second speed is 1°C / min to 5°C / min;
[0036] The first temperatur...
Embodiment 1
[0060] Manganese sulfate and nickel sulfate are configured into a mixed solution with a metal ion concentration of 1.2mol / L, and a NaOH solution with a concentration of 2.4mol / L is prepared, and diethylenetriamine is added to the NaOH solution to obtain a mixture, so that the diethylenetriamine The concentration is 0.02mol / L, and the above-mentioned mixed solution, mixture and ammonia water are simultaneously passed into the reaction kettle in a co-current manner, and the coprecipitation reaction is carried out at 60°C under the condition of stirring, and the pH value of the coprecipitation reaction is controlled to be 10.5 , by means of continuous feeding, carry out coprecipitation reaction for 7.5 hours, keep the concentration of ammonia in the reactor at 5.8g / L, filter and wash the obtained reaction product repeatedly to remove impurities therein, and obtain a particle size of 11.0μm Ni 0.5 mn 1.5 (OH) 4 ;
[0061] The above Ni 0.5 mn 1.5 (OH) 4 Calcining at 800°C for...
Embodiment 2
[0071] Manganese chloride and nickel chloride are configured into a mixed solution with a metal ion concentration of 3mol / L, and a NaOH solution with a concentration of 6mol / L is prepared, and triethylenetetramine is added to the NaOH solution to obtain a mixture, so that the triethylenetetramine The concentration is 0.01mol / L, and the above mixed solution, mixture and ammonia water are simultaneously passed into the reaction kettle in a co-current manner, and the coprecipitation reaction is carried out at 45°C under the condition of stirring, and the pH value of the coprecipitation reaction is controlled to be 10.6 , carry out the co-precipitation reaction for 8 hours by means of continuous feeding, keep the concentration of ammonia in the reactor at 7.0g / L, filter the obtained reaction product, and wash repeatedly to remove impurities therein, and obtain a particle size of 12.0μm Ni 0.5 mn 1.5 (OH) 4 ;
[0072] The above Ni 0.5 mn 1.5 (OH) 4 Calcining at 800°C for 4 ho...
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