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Method for synthesizing LiCoO2 powder through ultrasonic spray calcining and application of powder

A technology of calcination synthesis and ultrasonic spraying, applied in chemical instruments and methods, cobalt compounds, inorganic chemistry, etc., can solve the problems of high electrochemical activity of products, difficulty in large-scale preparation, high synthesis temperature, etc., and achieve simple and easy-to-operate preparation methods, Suitable for large-scale production and the effect of improving the reaction rate

Active Publication Date: 2019-05-28
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although high-temperature solid-phase synthesis has been used in industrial production, this method has high synthesis temperature and long synthesis time, and the synthesized powder has large particles and poor uniformity.
The hydrothermal synthesis method has the advantages of uniform phase, small particle size and simple process, but its large-scale preparation is difficult and the cycle performance is poor
Microwave synthesis has low temperature, short time, and high electrochemical activity of the product, but it is difficult to prepare on a large scale

Method used

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  • Method for synthesizing LiCoO2 powder through ultrasonic spray calcining and application of powder
  • Method for synthesizing LiCoO2 powder through ultrasonic spray calcining and application of powder
  • Method for synthesizing LiCoO2 powder through ultrasonic spray calcining and application of powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Synthesis of LiCoO by Ultrasonic Spray Calcination 2 The method of powder, comprises the following steps:

[0032] S1. Put lithium source and cobalt source into ultrapure water and mix to obtain raw material solution;

[0033] S2. Spray the raw material solution into the complexing agent solution after ultrasonic atomization, stir and mix, and freeze-dry to obtain the precursor;

[0034] S3. Calcining the precursor to obtain LiCoO 2 Powder.

Embodiment 2

[0036] Synthesis of LiCoO by Ultrasonic Spray Calcination 2 The method of powder, comprises the following steps:

[0037] S1. Put lithium source and cobalt source into ultrapure water and mix to obtain raw material solution;

[0038] Wherein, the lithium source is lithium oxalate; the cobalt source is cobalt nitrate; the concentration of lithium ions in the lithium source is 0.03mol / L, and the concentration of cobalt ions in the cobalt source is 0.03mol / L; the ratio of lithium ions to cobalt ions is 0.9.

[0039] S2. Spray the raw material solution into the complexing agent solution after ultrasonic atomization, the flow rate of the spray is 30mL / min, stir and mix, the stirring and mixing speed is 800r / min, freeze-dry, the freeze-dry temperature is minus 60°C, freeze The drying time is 12h to obtain the precursor;

[0040] S3. Calcinate the precursor, raise the temperature to 200°C at a rate of 3°C / min, keep it for 2h, then continue to raise the temperature to 700°C at a rat...

Embodiment 3

[0042] Synthesis of LiCoO by Ultrasonic Spray Calcination 2 The method of powder, comprises the following steps:

[0043] S1. Put lithium source and cobalt source into ultrapure water and mix to obtain raw material solution;

[0044] Wherein, the lithium source includes lithium oxalate, lithium acetate, lithium nitrate; the cobalt source is cobalt nitrate and cobalt acetate; the concentration of lithium ions in the lithium source is 0.06mol / L, and the concentration of cobalt ions in the cobalt source is 0.06mol / L; The ratio of ions to cobalt ions is 1.1.

[0045] S2. Spray the raw material solution into the complexing agent solution after ultrasonic atomization. The complexing agent solution is polyacrylic acid solution, the molecular weight of polyacrylic acid is 500,000, the concentration of polyacrylic acid solution is 20g / L, and the flow rate of the spray is 50mL / min, stirring and mixing, the stirring and mixing rate is 1400r / min, freeze-drying, the freeze-drying temper...

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Abstract

The invention discloses a method for synthesizing LiCoO2 powder through ultrasonic spray calcining. The method comprises the following steps of putting a lithium source and a cobalt source into an ultrapure water for mixing to obtain a raw material solution; spraying raw material solution into a complexing agent solution after the ultrasonic atomization; performing stirring and mixing; performingfreezing drying to obtain precursors; performing roasting treatment on the precursors to obtain LiCoO2 powder. The invention also discloses application of the LiCoO2 powder to lithium ion battery positive electrode. The uniform mixing between different reactants can be realized by an ultrasonic spraying method, so that the reaction speed is obviously improved; the synthesis temperature is reduced;the reaction time is reduced; the diffusion of the reactants and products can be accelerated; meanwhile, the new phase formation is promoted; the particle dimension and distribution are controlled. The battery made by using the synthesized LiCoO2 powder has excellent power rate performance and circulation performance.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery cathode materials, in particular to a method for synthesizing LiCoO by ultrasonic spray calcination 2 Powder method and its application. Background technique [0002] With the widespread popularization of mobile digital devices such as smartphones and tablets, the demand for lithium-ion batteries is increasing, and at the same time, higher requirements are placed on lithium-ion battery materials and technologies. LiCoO 2 It is one of the earliest lithium-ion battery materials to be commercially applied, and it is also the most widely used positive electrode material in the mobile digital field. LiCoO 2 The improvement of material properties and large-scale production are very important for the optimization and upgrading of mobile digital products. Currently, LiCoO 2 The synthetic method of solid phase reaction method, hydrothermal synthesis method, microwave synthesis method etc. ...

Claims

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Application Information

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IPC IPC(8): C01G51/00H01M4/525H01M10/0525
CPCY02E60/10
Inventor 郑刚李坤倪江秀樊少娟
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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