Preparation method of ternary positive electrode material NCA precursor

A positive electrode material and precursor technology, which is applied in the field of precursor preparation, can solve the problems such as the inhomogeneous particle size of nickel hydroxide, cobalt and aluminum substances, affecting quality stability and production efficiency, and the inability to fix and unify the process. Equipment maintenance, conducive to stable operation and excellent electrochemical performance

Inactive Publication Date: 2018-03-13
宋程
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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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  • Preparation method of ternary positive electrode material NCA precursor

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[0013] The invention as figure 1 As shown, a preparation method of NCA precursor of ternary positive electrode material is characterized in that it includes the following steps: (1) mixing the water-soluble salt of Ni, the water-soluble salt of Co and the water-soluble salt of Al and preparing an aqueous solution , to obtain a mixed ion solution; (2) fix NaOH and NH 3 ·H 2 O The flow rate of the mixed solution is 300-600L / h. The mixed ion solution described in step (1) is continuously added to the reactor for equimolar synthesis reaction, and the flow rate is constantly adjusted to stabilize the pH value of the reaction, and then heated and stirred. Obtaining a mixed alkali solution; (3) performing solid-liquid separation on the mixed alkali solution in step (2), washing and drying the obtained solid to obtain an NCA precursor of a ternary positive electrode material.

[0014] In this embodiment, the mixed ion solution includes Ni 2+ 、Co 2+ and Al 3+ , the concentration o...

Embodiment 1

[0019] Example 1: (1) The water-soluble salt of Ni, the water-soluble salt of Co and the water-soluble salt of Al are mixed and formulated into an aqueous solution to obtain a mixed ion solution; wherein the mixed ion solution includes Ni 2+ 、Co 2+ and Al 3+ The concentration of mixed ions is 0.8mol / L; (2) fix NaOH and NH 3 ·H 2 The flow rate of the O mixed solution is 300L / h. The mixed ion solution described in step (1) is continuously added to the reactor for equimolar synthesis reaction, and the flow rate is constantly adjusted to stabilize the pH value of the reaction. The temperature of the reactor is 30°C , the stirring speed is 600r / min; wherein, the NaOH concentration of the mixed alkali solution is 1.6mol / L, NH 3 ·H 2 The concentration of O is 0.05mol / L; (3) The synthetic product of step (2) is subjected to solid-liquid separation, and the obtained solid is washed and dried to obtain the NCA precursor of the ternary cathode material, and the obtained ternary precu...

Embodiment 2

[0020] Example 2: (1) The water-soluble salt of Ni, the water-soluble salt of Co and the water-soluble salt of Al are mixed and formulated into an aqueous solution to obtain a mixed ion solution; wherein the mixed ion solution includes Ni 2+ 、Co 2+ and Al 3+ The mixed ion concentration is 2mol / L; (2) fix NaOH and NH 3 ·H 2 O The flow rate of the mixed solution is 500L / h. The mixed ion solution in (1) is continuously added to the reactor for equimolar synthesis reaction, and the flow rate is constantly adjusted to stabilize the pH value of the reaction. The temperature of the reactor is 55.3°C. Stirring speed is 900r / min; Wherein, the NaOH concentration of described mixed alkali solution is 4mol / L, NH 3 ·H 2 The concentration of O is 0.8mol / L; (3) The synthetic product of step (2) is subjected to solid-liquid separation, and the obtained solid is washed and dried to obtain the NCA precursor of the ternary cathode material, and the obtained ternary precursor—Nickel Cobalt Al...

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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...

Claims

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Application Information

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IPC IPC(8): H01M4/525C01G53/04
CPCC01G53/04C01P2004/03C01P2004/32C01P2004/51C01P2004/61C01P2004/82C01P2006/11H01M4/525Y02E60/10
Inventor 周怡静袁明刚苗芳
Owner 宋程
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