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A kind of preparation method of lithium cobalt phosphate cathode material for lithium battery

A technology of lithium cobalt phosphate and cathode material, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low specific capacity, poor electrochemical performance stability, and low product stability of lithium cobalt phosphate cathode materials, and achieve enhanced The effect of electrochemical performance, enhanced coating, and improved electrochemical cycle performance

Active Publication Date: 2021-08-13
GUANGZHOU TIGER HEAD BATTERY GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, whether it is high-temperature solid-phase synthesis, sol-gel, or alcohol precipitation, there are still many impurities, complex processes, and high costs in the prepared LiCoPO4 precursor products, resulting in stable products. The obtained product is used in the lithium battery process, and the performance of the obtained lithium battery is poor, the specific capacity of the lithium cobalt phosphate positive electrode material is low, and the electrochemical performance stability during use is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for preparing a lithium cobalt phosphate cathode material for a lithium battery, comprising the following steps:

[0023] (1) After mixing phosphoric acid and urea according to the mass ratio of 2:0.8, add water until completely dissolved, then raise the temperature to 80°C, and treat for 20 minutes;

[0024] (2) Mix ferrous chloride tetrahydrate powder and calcium acetate powder in an equal mass ratio, and the mixing process is carried out under air isolation conditions;

[0025] (3) Mix the material of step (1), the material of step (2) and lithium hydroxide at a vacuum degree of 0.02MPa according to a mass ratio of 1:1:3;

[0026] (4) Mix cobalt oxide and absolute ethanol solvent evenly at a mass ratio of 1:3, and add the mixture obtained in step (3) to it at a mass ratio of 1:1 at a stirring speed of 1000r / min, Stir evenly, heat and concentrate, and carry out sintering treatment in the presence of inert gas such as argon, the sintering temperature is 900°C...

Embodiment 2

[0028] A method for preparing a lithium cobalt phosphate cathode material for a lithium battery, comprising the following steps:

[0029] (1) After mixing phosphoric acid and urea according to the mass ratio of 2:1.3, add water until completely dissolved, then raise the temperature to 90°C, and treat for 30 minutes;

[0030] (2) Mix ferrous chloride tetrahydrate powder and calcium acetate powder in an equal mass ratio, and the mixing process is carried out under air isolation conditions;

[0031] (3) Mix the material of step (1), the material of step (2) and lithium hydroxide in a vacuum of 0.08 MPa, according to the mass ratio of 1:1:3;

[0032] (4) Mix cobalt oxide and absolute ethanol solvent uniformly at a mass ratio of 1:3, and add the mixture obtained in step (3) to it at a mass ratio of 1:1 at a stirring speed of 3000r / min, Stir evenly, heat and concentrate, and carry out sintering treatment in the presence of inert gas such as argon, the sintering temperature is 900-1...

Embodiment 3

[0034] A method for preparing a lithium cobalt phosphate cathode material for a lithium battery, comprising the following steps:

[0035] (1) After mixing phosphoric acid and urea at a mass ratio of 2:1, add water until completely dissolved, then raise the temperature to 85°C, and treat for 25 minutes;

[0036] (2) Mix ferrous chloride tetrahydrate powder and calcium acetate powder in an equal mass ratio, and the mixing process is carried out under air isolation conditions;

[0037] (3) Mix the material of step (1), the material of step (2) and lithium hydroxide at a vacuum degree of 0.06MPa according to a mass ratio of 1:1:3;

[0038] (4) Mix cobalt oxide and absolute ethanol solvent uniformly at a mass ratio of 1:3, and add the mixture obtained in step (3) to it at a mass ratio of 1:1 at a stirring speed of 2000r / min, Stir evenly, heat and concentrate, and sinter in the presence of argon and other inert gases. The sintering temperature is 1100°C, the sintering time is 9h, a...

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Abstract

The invention relates to the technical field of battery positive electrode materials, in particular to a method for preparing a lithium cobalt phosphate positive electrode material for a lithium battery. After mixing phosphoric acid and urea, adding water to dissolve them, and heating the phosphoric acid and urea under the premise of excess phosphoric acid, Generate materials with a complex structure, and mix ferrous chloride, calcium acetate and other powders under air-isolated conditions, effectively avoiding the oxidation of ferrous ions in contact with air, and adding calcium acetate powder, so that under the subsequent action, Generating calcium chloride components; combining physical dry mixing of lithium hydroxide in a vacuum environment, and dissolving cobalt oxide in a solvent, mixing, so that a mixed material containing cobalt lithium phosphate and calcium chloride components is generated, and is calcined. Calcium chloride is formed to coat the lithium cobalt phosphate, which improves the electrochemical cycle performance of the lithium cobalt phosphate cathode material.

Description

technical field [0001] The invention relates to the technical field of battery cathode materials, in particular to a method for preparing lithium cobalt phosphate cathode materials for lithium batteries. Background technique [0002] Olivine-type phosphate lithium intercalation material LiMPO 4 etc., have reversible lithium intercalation function and high structural stability. Especially LiFePO 4 It has the characteristics of abundant raw materials, low price, and environmental friendliness. When it is used as a cathode material, it has good thermal stability, excellent cycle performance and high safety, and has entered the stage of industrialization. In recent years, lithium manganese phosphate and lithium cobalt phosphate have also received extensive attention and in-depth research. [0003] At present, the commonly used preparation methods include solid-phase method, sol-gel method, hydrothermal method and so on. The solid-phase synthesis method is the most commonly u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5825H01M4/62H01M10/0525Y02E60/10
Inventor 不公告发明人
Owner GUANGZHOU TIGER HEAD BATTERY GROUP
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