Preparation method of nickel-cobalt-aluminum ternary positive electrode material precursor

A cathode material and precursor technology, which is applied in the field of new energy battery material precursor synthesis, can solve the problems of irregularity, affecting the electrochemical performance of cathode materials, and less pore distribution, so as to reduce microcracks, improve cycle performance and safety performance. , the effect of reducing stress expansion

Pending Publication Date: 2021-11-02
JINGMEN GEM NEW MATERIAL
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Problems solved by technology

In the synthesis process of the existing nickel-cobalt-aluminum ternary precursor, ammonia solution is generally used as a complexing agent. The interior of the synthesized precursor is generally a solid structure with fewer pores and irregular pore distribution, which is not conducive to the subsequent sintering process of the precursor. The rapid diffusion of Li+ in the crystal affects the electrochemical performance of the cathode material

Method used

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  • Preparation method of nickel-cobalt-aluminum ternary positive electrode material precursor

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Experimental program
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Effect test

Embodiment 1

[0020] (1) prepare respectively the binary solution of concentration 60g / L, nickel-cobalt molar ratio is 5.0:5.0, aluminum content is the sodium metaaluminate solution of 0.5g / L, and concentration is the liquid caustic soda solution of 9.0%, and concentration is 2.0mol The complexing agent solution of / L, wherein complexing agent is ammonium sulfate;

[0021] (2) to 6.0m 3 Add 3.0m 3 Pure water, 20L concentration is 2.0mol / L complexing agent solution (i.e. ammonium sulfate solution), 12L concentration is 9.0% liquid caustic soda solution, is made into the base liquid that pH is 9.0, and ammonia concentration is 2.5g / L, passes into Nitrogen flow 0.1m 3 / h, heat up to 30°C;

[0022] (3) Add the prepared nickel-cobalt binary solution, sodium metaaluminate solution, liquid caustic soda and complexing agent solution in parallel at 200L / h, 10L / h, 40L / h and 20L / h through a mass flow meter. React in the reactor, control the stirring rate at 105rpm, and the temperature at 30°C, and...

Embodiment 2

[0026] (1) prepare concentration 140g / L respectively, the binary solution that nickel-cobalt mol ratio is 9.9:0.1, aluminum content is the sodium metaaluminate solution of 50.0g / L, and concentration is the liquid caustic soda solution of 60%, and concentration is 20mol / The complexing agent solution of L, wherein the complexing agent is ammonium sulfate, ammonium thiosulfate, and the ratio of the amount of substances is 1:1;

[0027] (2) to 15.0m 3 Add 8.0m to the reaction kettle 3 Pure water, 400L of complexing agent solution with a concentration of 20mol / L, 100L of 60% liquid caustic soda, made into a bottom solution with a pH of 12.0 and an ammonia concentration of 11.9g / L, and a nitrogen flow rate of 10.0m 3 / h, heat up to 80°C;

[0028] (3) Add the prepared nickel-cobalt binary solution, sodium metaaluminate solution, liquid caustic soda and complexing agent solution in parallel at 500L / h, 125L / h, 162L / h and 43L / h through a mass flow meter Reactor, stirring rate 400rpm...

Embodiment 3

[0032] (1) Prepare respectively a binary solution with a concentration of 80g / L and a nickel-cobalt molar ratio of 7.0:3.0, a sodium metaaluminate solution with an aluminum content of 6.2g / L, and a 25% liquid alkali solution with a concentration of 8.0mol / L complexing agent solution, wherein the complexing agent is ammonium sulfate, ammonium thiosulfate, ammonium sulfide, the ratio of the amount of substances is 1:0.5:1;

[0033] (2) to 8.0m 3 Add 4.0m to the reaction kettle 3 Pure water, 200L of complexing agent solution with a concentration of 8.0mol / L, 30L of 25% liquid caustic soda, made into a bottom solution with a pH of 11.8 and an ammonia concentration of 7.6g / L, and a nitrogen gas flow rate of 2.5m 3 / h, heat up to 45°C;

[0034] (3) Add the prepared nickel-cobalt binary solution, sodium metaaluminate solution, liquid caustic soda and complexing agent solution in parallel at 300L / h, 80L / h, 120L / h and 30L / h through a mass flow meter Reactor, stirring rate 145rpm, t...

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Abstract

The invention relates to a preparation method of a nickel-cobalt-aluminum ternary positive electrode material precursor. The preparation method comprises the following steps: respectively preparing a nickel-cobalt binary solution, a sodium metaaluminate solution, a liquid alkali solution and a complexing agent solution, wherein the complexing agent is one or more of ammonium sulfite, ammonium bisulfite, ammonium sulfate, ammonium bisulfate, ammonium sulfide, ammonium hydrosulfide, diamine pentasulfide and ammonium thiosulfate; adding the base solution into the reaction kettle, introducing nitrogen, and controlling the temperature and the stirring rotating speed; adding the nickel-cobalt binary solution, the sodium metaaluminate solution, the liquid caustic soda solution and the complexing agent solution into a reaction kettle in a parallel flow manner for reaction; when the particle D50 generated by the reaction reaches 3.0-18.0 [mu]m, stopping feeding; performing aging, washing and impurity removal, dehydration, drying, batch mixing, screening and iron removal on the obtained material, and performing packaging to obtain a finished product. In the process of synthesizing the nickel-cobalt-aluminum ternary precursor, the variety and the adding amount of the added complexing agent are adjusted, and the problems that pores in the precursor are few and are irregularly distributed are solved.

Description

technical field [0001] The invention relates to the field of synthesis of new energy battery material precursors, in particular to a preparation method of a nickel-cobalt-aluminum ternary cathode material precursor. Background technique [0002] The morphology and structure of the cathode material determine its electrochemical performance, and it has good inheritance to the morphology and structure of the precursor, so the morphology and structure of the precursor directly affect the performance of the cathode material. In the synthesis process of the existing nickel-cobalt-aluminum ternary precursor, ammonia solution is generally used as a complexing agent. The interior of the synthesized precursor is generally a solid structure with fewer pores and irregular pore distribution, which is not conducive to the subsequent sintering process of the precursor. The rapid diffusion of Li+ in the crystal affects the electrochemical performance of the cathode material. Contents of t...

Claims

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Application Information

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IPC IPC(8): C01G53/00
CPCC01G53/006C01P2004/61C01P2006/12
Inventor 许开华代凯吕志王登登刘坤杨琪郑航张鹏
Owner JINGMEN GEM NEW MATERIAL
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