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Spherical cobalt carbonate with large particle size and its synthesis method

A synthesis method and technology of cobalt carbonate, applied in the direction of cobalt carbonate, etc., to achieve the effects of short synthesis time, improved utilization rate, and continuous and controllable process

Active Publication Date: 2022-04-08
JINCHI ENERGY MATERIALS CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For the problems encountered during the preparation of large particle size spherical cobalt carbonate at present, the main purpose of the present invention is to provide a kind of synthetic method of large particle size spherical cobalt carbonate

Method used

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  • Spherical cobalt carbonate with large particle size and its synthesis method
  • Spherical cobalt carbonate with large particle size and its synthesis method
  • Spherical cobalt carbonate with large particle size and its synthesis method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Step S1: Prepare a cobalt sulfate solution with a concentration of 1.5 mol / L and an ammonium bicarbonate solution with a concentration of 2.5 mol / L;

[0036] Step S2: Use 0.5 mol / L ammonium bicarbonate solution as the base liquid, the volume of the bottom liquid accounts for 60% of the total volume of the synthesis tank, and the stirring blade of the synthesis tank is a disc turbine type stirring. Adjust the reaction temperature of the system to 40°C, and the linear stirring speed to 4m / s. Add the cobalt sulfate solution and the ammonium bicarbonate solution into the reaction kettle concurrently, wherein the flow rate of the cobalt sulfate solution is 2L / h, and the ammonium bicarbonate solution controls the pH of the reaction system to be 7.7~7.8. The total feeding time of the control system is 80h and the feeding is stopped when the particle size is 8.2±0.2μm, and the centrifuge is dried for later use;

[0037] Step S3: Weigh 5 kg of the seed crystal obtained in step ...

Embodiment 2

[0041] Step S1: Prepare a cobalt sulfate solution with a concentration of 1.5 mol / L and an ammonium bicarbonate solution with a concentration of 2.5 mol / L;

[0042] Step S2: Use 1.0 mol / L ammonium bicarbonate solution as the base liquid, the volume of the base liquid accounts for 30% of the total volume of the synthesis tank, and the stirring blade of the synthesis tank is a disc turbine type stirring. Adjust the reaction temperature of the system to 45°C, and the linear stirring speed to 5m / s. Add the cobalt sulfate solution and the ammonium bicarbonate solution into the reaction kettle concurrently, wherein the flow rate of the cobalt sulfate solution is 3L / h, and the ammonium bicarbonate solution controls the pH of the reaction system to be 7.6~7.7. When the total feeding time of the control system is 100h and the particle size is 9.8±0.2μm, the feeding is stopped, and the centrifugal drying is used for later use;

[0043] Step S3: Weigh 8 kg of the seed crystal obtained i...

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Abstract

The invention belongs to the technical field of battery materials and discloses a synthesis process of cobalt carbonate. In the wet co-precipitation process, the cobalt carbonate seed crystals are first synthesized, and then the effective regulation of the cobalt carbonate primary particle morphology is realized by controlling the pH value of the co-precipitation process. The surface of the cobalt carbonate synthesized by the present invention has a certain porosity, which can increase the CO of cobalt carbonate in the one-stage calcination process. 2 The rapid release of gas solves the cracking problem of secondary particles during the calcination process.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and in particular relates to a synthesis process of a cathode material precursor, in particular to a synthesis process of cobalt carbonate. Background technique [0002] Based on the rapid development of the 3C market, people's demand and requirements for tricobalt tetroxide are getting higher and higher. Cobalt carbonate is one of the important precursors of cobalt tetroxide, and its properties and indicators largely determine the performance of cobalt tetroxide. Generally speaking, there are usually two requirements for large particle size cobalt tetroxide in the market: 1) the shape is spherical; 2) the secondary particles do not crack. Spherical cobalt carbonate with large particle size is usually calcined in two stages to alleviate the cracking problem of secondary particles. This process reduces the utilization rate of equipment and increases labor costs. When wet synthesis of l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G51/06
CPCC01G51/06C01P2004/32C01P2004/03C01P2004/61C01P2004/50
Inventor 苗小欢胡志兵张海艳孟立君侯鑫宇黎力刘宙
Owner JINCHI ENERGY MATERIALS CO LTD