Preparation method of ternary positive electrode material NCA precursor

Abstract

A preparation method of a ternary positive electrode material NCA precursor comprises the following steps: (1) mixing an Ni water-soluble salt, a Co water-soluble salt and an Al water-soluble salt toprepare an aqueous solution, to obtain a mixed ion solution; (2) making the flow rate of the NaOH and NH3.H2O mixed solution constant at 300-600 L / h, continuously adding the mixed ion solution of thestep (1) into a reactor, carrying out equimolar synthetic reaction, constantly adjusting the flow rate to stabilize the pH value of the reaction, and then heating and stirring to obtain a mixed alkalisolution; and (3) carrying out solid-liquid separation of the mixed alkali solution of the step (2), and washing and drying the obtained solid to obtain the ternary positive electrode material NCA precursor.

Description

technical field [0001] The invention relates to a preparation method of a precursor, in particular to a preparation method of a ternary cathode material NCA precursor. Background technique [0002] The control method of the pH value during the reaction process of the NCA precursor of the conventional ternary cathode material is to use a fixed sulfate flow rate and adjust the lye flow rate, so that the pH value during the reaction process is stable within the range of process parameters. During the experiment, we found that For the precipitation reaction of the NCA precursor of the ternary cathode material in the conventional control method, the pH value is more likely to fluctuate. The conventional method for preparing the NCA precursor of the ternary cathode material has a particle size of nickel cobalt aluminum hydroxide due to the defect of the feeding method. The size is not uniform enough and the density fluctuates greatly, so that the process of ternary cathode materia...

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Problems solved by technology

[0002] The control method of the pH value during the reaction process of the NCA precursor of the conventional ternary cathode material is to use a fixed sulfate flow rate and adjust the lye flow rate, so that the pH value during the reaction process is stable within the range of process parameters. During the experiment, we found that For the precipitation reaction of the NCA precursor of the ternary cathode material in the conventional control method, the pH value is more likely to fluctuate. The conventional method for preparing the NCA precursor of the ternary cathode material has a particle size of nickel cobalt aluminum hydroxide due to the defect of the feeding method. The size is not uniform enough and the density fluctuates greatly, so that the process of ternary cathode material NCA material cannot be fixed and unified during the sintering process. Different sintering processes need to be adjusted for different production batches, which affects quality stability and production efficiency.

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