Preparation method of high-nickel positive electrode material for lithium ion battery
A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as damage, poor cycle performance, and attenuation of material cycle performance, and achieve inhibition of precipitation, good crystallinity, and improved stability sexual effect
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[0044] Example 1
[0045] (1) Configure a salt solution with a concentration of 2mol / L, where the molar ratio of nickel sulfate, cobalt sulfate and manganese sulfate is 88:9:3, configure the alkali into an alkali solution with a concentration of 3mol / L; configure the complexing agent 1mol / ammonia solution;
[0046] (2) Add the salt solution, alkali solution, and complexing agent solution to the reaction kettle in parallel to react, keep the stirring speed constant during the process, and pass the inert atmosphere argon for protection, while controlling the reaction pH to 11.8 and the reaction temperature to 45 ℃, the concentration of the complexing agent ammonia in the reaction system is controlled to 3g / L, when the reaction is completed, stop the liquid feeding, keep the temperature of the reaction liquid and the stirring speed unchanged, and continue to stir for 120 minutes to obtain the hydroxide precursor slurry;
[0047] (3) The hydroxide precursor slurry in step (2) is subject...
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[0051] Example 2
[0052] (1) Configure a salt solution with a concentration of 1.5mol / L, in which the molar ratio of nickel sulfate, cobalt sulfate and manganese sulfate is 83:10:7, configure the alkali into an alkali solution with a concentration of 2mol / L; add the complexing agent Configured into 3mol / ammonia solution;
[0053] (2) Add the salt solution, alkali solution, and complexing agent solution to the reaction kettle in parallel flow to react, keep the stirring speed constant during the process, pass the inert atmosphere argon for protection, and control the reaction pH to 12.3 and reaction temperature to 55 ℃, the concentration of the complexing agent ammonia in the reaction system is controlled to 2g / L. When the reaction is completed, stop feeding, keep the temperature of the reaction solution and the stirring speed unchanged, and continue stirring for 120 minutes to obtain the hydroxide precursor slurry.
[0054] (3) The hydroxide precursor slurry in step (2) is subjecte...
Example Embodiment
[0058] Example 3
[0059] (1) Prepare a salt solution with a concentration of 2.5mol / L, in which the molar ratio of nickel sulfate to cobalt sulfate is 88:9, configure the alkali solution and aluminum nitrate solution into a 0.2mol / L aluminum solution, and configure the alkali to a concentration It is a 3mol / L alkaline solution; the complexing agent is configured into a 1mol / L ammonia solution;
[0060] (2) Add the salt solution, aluminum solution, alkali solution, and complexing agent solution to the reaction kettle in parallel to react, keep the stirring speed constant during the process, and pass the inert atmosphere argon for protection, while controlling the reaction pH to 12.6, the reaction The temperature is 50℃, and the concentration of the complexing agent ammonia in the reaction system is controlled to 3g / L. When the reaction is completed, stop the liquid feeding, keep the temperature of the reaction liquid and the stirring speed unchanged, and continue stirring for 120 m...
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