Preparation method for lithium ion battery cathode material-lithium nickel manganese oxide
A technology for lithium-ion batteries and positive electrode materials, which is applied to battery electrodes, circuits, electrical components, etc., can solve the problems of low energy density, low tap density of lithium nickel manganese oxide materials, and high equipment requirements, and achieve the goal of improving the tap density Effect
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Embodiment 1
[0017] (1) According to the molar ratio n(Ni):n(Mn)=1:3, accurately weigh manganese sulfate and nickel sulfate, and add appropriate amount of distilled water to prepare mixed solution A.
[0018] (2) Prepare precipitant solution B according to the molar ratio of sodium oxalate to sodium hydroxide is 1.5:1.
[0019] (3) Add the mixed salt solution A and the precipitant solution B to the container containing distilled water at the same time, and under the condition that the stirring speed is 300r / min, adjust the pH value in the reaction solution to about 9.5 by controlling the speed of adding the precipitant . During the whole reaction process, the temperature of the reaction solution was 40° C., washed and dried after 3 hours of reaction to obtain a precursor of manganese oxalate / nickel hydroxide.
[0020] (4) Place the precursor obtained in step (3) in an environment of 500° C. for 6 hours and pre-calcine the product lithium carbonate according to the molar ratio of n(Li):n(N...
Embodiment 2
[0023] (1) According to the molar ratio n(Ni):n(Mn)=1:3, accurately weigh manganese sulfate and nickel sulfate, and add appropriate amount of distilled water to prepare mixed solution A.
[0024] (2) Prepare precipitant solution B according to the molar ratio of potassium oxalate to sodium hydroxide of 1.5:1.
[0025] (3) Add the mixed salt solution A and the precipitant solution B to the container containing distilled water at the same time, and under the condition that the stirring speed is 300r / min, adjust the pH value in the reaction solution to about 9.3 by controlling the speed of adding the precipitant . During the whole reaction process, the temperature of the reaction solution was kept at 50° C., washed and dried after reacting for 3 hours to obtain a precursor of manganese oxalate / nickel hydroxide.
[0026] (4) Place the precursor obtained in step (3) in an environment of 500° C. for 6 hours and pre-calcine the product and lithium carbonate according to the molar ra...
Embodiment 3
[0029] (1) According to the molar ratio n(Ni):n(Mn)=1:3, accurately weigh manganese sulfate and nickel sulfate, add appropriate amount of distilled water to configure mixed solution A;
[0030] (2) The molar ratio is n(C 2 o 4 2- ): n(OH - )=1.5:1 Potassium oxalate, ammonium oxalate and potassium hydroxide precipitant solution B, wherein n (potassium oxalate):n (ammonium oxalate)=2:1;
[0031] (3) Add the mixed salt solution A and the precipitant solution B to the container containing distilled water at the same time, and under the condition that the stirring speed is 300r / min, adjust the pH value in the reaction solution to about 9.8 by controlling the speed of adding the precipitant . In addition, during the whole reaction process, the temperature of the reaction solution is at 50°C, and after 3 hours of reaction, it is washed and dried to obtain the precursor of manganese oxalate / nickel hydroxide;
[0032] (4) Place the precursor obtained in step (3) in an environment ...
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