A ternary positive electrode material coated with lithium phosphate and conductive carbon material and its preparation method and application

A positive electrode material, conductive carbon technology, applied in the direction of electrical components, battery electrodes, circuits, etc., can solve the problems that the electrical conductivity and ion conductivity cannot be improved at the same time, and achieve the effect of improving cycle stability, increasing diffusion rate, and preventing corrosion

Active Publication Date: 2022-04-29
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defects and deficiencies that the surface coating modification of the existing ternary positive electrode materials cannot simultaneously improve the conductivity and ion conductivity. Material coating modification, on the basis of effectively improving the cycle stability of the material, greatly improves the rate performance of the material, especially the high rate performance, in order to improve the cycle stability and high rate performance of the nickel-based layered cathode material at the same time Offers practical ways to improve

Method used

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  • A ternary positive electrode material coated with lithium phosphate and conductive carbon material and its preparation method and application
  • A ternary positive electrode material coated with lithium phosphate and conductive carbon material and its preparation method and application
  • A ternary positive electrode material coated with lithium phosphate and conductive carbon material and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Preparation of LiNi coated with lithium phosphate and conductive carbon material by liquid phase chemical polymerization 0.8 co 0.1 mn 0.1 o 2 Cathode material.

[0040] S1. Weigh 0.02g of phosphoric acid and dissolve it in anhydrous ethanol solution, sonicate at room temperature for 15min and then continue magnetic stirring for 2h;

[0041] S2. Next, take 4g of ternary positive electrode material and 0.08g of carbon nanotubes, mix and grind the ternary positive electrode material and carbon nanotubes evenly;

[0042] S3. Add the above powder into the solution being stirred, and stir for 1 h;

[0043] S4. Transfer the above solution to an oil bath at 80°C and stir until the ethanol solution is evaporated to dryness, then put it in a drying oven

[0044] Drying to obtain a ternary positive electrode material (CNT-LPO-NCM) coated with lithium phosphate and conductive carbon material;

[0045] S5. The assembled battery was first activated for 2 cycles at a rate of 0....

Embodiment 2

[0050] Preparation of LiNi coated with lithium phosphate and conductive carbon material by liquid phase chemical polymerization 0.8 co 0.1 mn 0.1 o 2 Cathode material.

[0051] S1. Weigh 0.04g of phosphoric acid and dissolve it in anhydrous ethanol solution, sonicate at room temperature for 15min and then continue magnetic stirring for 2h;

[0052] S2. Then, take 4g ternary positive electrode material and 0.08g graphene, mix and grind the ternary positive electrode material and graphene evenly;

[0053] S3. Add the above powder into the solution being stirred, and stir for 1 h;

[0054] S4. Transfer the above solution to an oil bath at 80°C and stir until the ethanol solution is evaporated to dryness, then put it in a drying oven

[0055] Drying to obtain a ternary positive electrode material coated with lithium phosphate and conductive carbon material;

[0056] S5. The assembled battery was first activated for 2 cycles at a rate of 0.1C, and then cycled for 5 cycles at ...

Embodiment 3

[0059] Preparation of LiNi coated with lithium phosphate and conductive carbon material by liquid phase chemical polymerization 0.8 co 0.1 mn 0.1 o 2 Cathode material.

[0060] S1. Weigh 0.04g of phosphoric acid and dissolve it in anhydrous ethanol solution, sonicate at room temperature for 15min and then continue magnetic stirring for 2h;

[0061] S2. Next, weigh 4g of ternary positive electrode material and 0.04g of acetylene black, mix and grind the ternary positive electrode material and acetylene black evenly;

[0062] S3. Add the above powder into the solution being stirred, and stir for 1 h;

[0063] S4. Transfer the above solution to an oil bath at 80°C and stir until the ethanol solution is evaporated to dryness, then put it in a drying oven

[0064] Drying to obtain a ternary positive electrode material coated with lithium phosphate and conductive carbon material;

[0065] S5. The assembled battery was first activated for 2 cycles at a rate of 0.1C, and then cy...

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Abstract

The invention discloses a ternary positive electrode material coated with lithium phosphate and a conductive carbon material, comprising a ternary positive electrode material, a conductive carbon material adsorbed and inserted into the surface of the ternary positive electrode material, and lithium phosphate coated on the surface of the ternary positive electrode material layer, the preparation method of which is: dissolving phosphoric acid in a solvent, ultrasonic dispersion at room temperature and continuous stirring, then adding the mixed powder of ternary positive electrode material and conductive carbon material to the solution being stirred, and continuously stirring and reacting; finally, the above-mentioned The mixed solution is heated to remove the solvent, and a ternary positive electrode material coated with lithium phosphate and conductive carbon material is obtained. The present invention covers the surface layer of the conductive carbon material to form a uniform and continuous complete coating layer, which can effectively reduce the internal resistance at the interface of the material and improve the electronic conductivity of the material to a certain extent; at the same time, phosphoric acid is generated by chemical method Lithium provides lithium ion channels for the transmission of lithium ions, thereby improving the ionic conductivity of the material; moreover, the coating layer can effectively prevent the electrolyte from corroding the material, thereby greatly improving the cycle stability of the material.

Description

technical field [0001] The present invention relates to the technical field of lithium battery positive electrode materials, in particular to the modification of lithium battery ternary positive electrode materials, and more specifically, to a ternary positive electrode material coated with lithium phosphate and conductive carbon material and its preparation method and application. Background technique [0002] With the development of new energy vehicles, lithium-ion power batteries have attracted much attention as the most popular electric vehicle power batteries. Lithium-ion batteries have been widely used in various portable electronic devices, and have broad application prospects in the fields of electric bicycles, electric vehicles, and energy storage batteries in the future. This puts forward higher requirements on the performance of cathode materials for lithium-ion batteries. In recent years, layered lithium-rich transition metal (Ni, Co, Mn) oxide cathode materials ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62
CPCH01M4/364H01M4/625H01M4/5825Y02E60/10
Inventor 杨少钿樊青录施志聪林凯基刘丽英
Owner GUANGDONG UNIV OF TECH
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