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Preparation method of cobalt carbonate for lithium ion battery

A lithium-ion battery and cobalt carbonate technology, which is applied in cobalt carbonate, battery electrodes, secondary batteries, etc., can solve problems affecting the performance of lithium cobalt oxide, achieve the effect of improving uniformity and reducing precipitation rate

Active Publication Date: 2021-01-01
GEM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the traditional synthesis method is only suitable for the doping of medium and low aluminum content, but for the doping of high aluminum content, the reaction conditions of low aluminum doping will produce a lot of small particles in the reaction process, and when washing and drying at the same time There will be a lot of flaky morphology on the particle surface, which will seriously affect the performance of lithium cobalt oxide in the later stage

Method used

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  • Preparation method of cobalt carbonate for lithium ion battery
  • Preparation method of cobalt carbonate for lithium ion battery
  • Preparation method of cobalt carbonate for lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028](1) Prepare aluminum sulfate solution with aluminum ion concentration of 2.7g / L;

[0029](2) Add cobalt sulfate solution and aluminum sulfate solution with a cobalt ion concentration of 90g / L, and a concentration of 200g / L ammonium bicarbonate solution. These three solutions are respectively added to the ammonium bicarbonate solution as a bottom liquid through a metering pump in a co-current manner In the reactor, the concentration of ammonium bicarbonate solution is 5g / L, the feed rate of cobalt salt solution is 50ml / min, the feed rate of aluminum salt solution is 25ml / min, and the feed rate of ammonium bicarbonate solution is 100ml / min. The reaction conditions of the reaction system of the co-precipitation reaction in the reactor are: pH 7.0-7.2, temperature 45°C, and reactor speed of 280 rpm. After 40 hours of reaction, the D50 particle size reaches 7 microns. Half of the materials are stored as seeds;

[0030]The remaining half of the materials continue to react in the reactor, ...

Embodiment 2

[0037](1) Prepare an aluminum sulfate solution with an aluminum ion concentration of 0.7g / L;

[0038](2) Cobalt chloride solution and aluminum sulfate solution with a cobalt ion concentration of 65g / L, and a concentration of 230g / L ammonium bicarbonate solution were added to the ammonium bicarbonate as the bottom liquid through a metering pump in a co-current manner. In the reactor, the concentration of ammonium bicarbonate bottom solution is 20g / L, the feed rate of cobalt salt solution is 50ml / min, the feed rate of aluminum salt solution is 60ml / min, and the feed rate of ammonium bicarbonate solution is 80ml / min The reaction conditions of the reaction system of the co-precipitation reaction in the reactor are: pH value 7.2-7.4, temperature 55°C, reactor speed 160rpm, after 40 hours of reaction, the D50 particle size reaches 6 microns, and then the reactor is divided and separated Half of the materials are stored as seeds;

[0039]The remaining half of the materials continue to react in t...

Embodiment 3

[0046](1) Prepare aluminum sulfate solution with aluminum ion concentration of 5.6g / L;

[0047](2) Add cobalt chloride solution and cobalt nitrate solution mixed solution with cobalt ion concentration of 195g / L, aluminum sulfate solution, and ammonium bicarbonate solution with concentration of 260g / L. These three solutions are added in parallel through metering pumps. In the reactor with deionized water as the bottom liquid, the feed rate of cobalt salt solution is 20ml / min, the feed rate of aluminum salt solution is 10ml / min, and the feed rate of ammonium bicarbonate solution is 40ml / min. Co-precipitation in the reactor The reaction conditions of the reaction system are as follows: pH value 7.2-7.4, temperature 30°C, reaction kettle speed 220 rpm, after 40 hours of reaction, the D50 particle size reaches 8 microns, at this time, the kettle is divided, and half of the separated materials are used as crystals. Kind of storage

[0048]The remaining half of the materials continue to react in...

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Abstract

The invention discloses a preparation method of cobalt carbonate for a lithium ion battery. The preparation method comprises the following steps: adding a cobalt salt solution, an aluminum salt solution and an ammonium bicarbonate solution into a reaction kettle containing a base solution in parallel flow, and carrying out a staged coprecipitation reaction at a staged stirring speed of the reaction kettle, thereby avoiding the generation of small particles; and using low-concentration ammonium bicarbonate as a washing liquor to prevent water from reacting with aluminum precipitate in the washing process to generate flakes to separate out of the surface.

Description

Technical field[0001]The invention relates to the technical field of battery material precursors, in particular to a method for preparing cobalt carbonate for lithium ion batteries.Background technique[0002]Cobalt tetroxide is the main raw material of lithium cobalt oxide, mainly used in the field of 3C electronic products, and its energy density determines the energy density of lithium ion batteries to a certain extent. In order to release higher energy in a smaller space, lithium cobalt oxide is moving towards a high voltage of 4.5V-4.6V. Under high voltage, more lithium ions can be extracted from the crystal structure, but more After the lithium ions are removed, the structural stability of the material has been severely damaged, resulting in a sharp drop in cycle performance. At present, the structural stability of the material during high-voltage charging and discharging can be improved by doping or coating respectively. Among them, aluminum is one of the most common doping ele...

Claims

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Application Information

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IPC IPC(8): C01G51/06H01M4/525H01M10/0525
CPCC01G51/06H01M4/525H01M10/0525C01P2004/03C01P2004/61C01P2004/32Y02E60/10
Inventor 许开华李晨威刘文泽杨航易全瑞郭苗苗张冬冬
Owner GEM CO LTD
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