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Preparation method of phosphate-coated metal-doped ternary cathode active material and preparation and application thereof

A positive electrode active material and positive electrode material technology, applied in the field of lithium ion battery positive electrode, can solve the problems of electrical performance to be further improved, no electrochemical activity, high surface alkalinity of materials, etc., to reduce ion surface diffusion and internal transfer impedance, Easy to industrialized production, reduce the effect of side reactions

Active Publication Date: 2019-11-01
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nevertheless, the ternary cathode material still has the problem of residual lithium on the surface, which will lead to high alkalinity on the surface of the material, easy to absorb water, and have many adverse effects on the battery manufacturing process and electrochemical performance.
In addition, ternary cathode materials, especially high-nickel ternary cathode materials, have serious cation mixing, and high-valent nickel is prone to side reactions with the electrolyte during charging, which will easily collapse the material structure and form a salt rock-like structure that is not electrochemically active.
The electrical properties of existing NCM ternary materials need to be further improved

Method used

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  • Preparation method of phosphate-coated metal-doped ternary cathode active material and preparation and application thereof
  • Preparation method of phosphate-coated metal-doped ternary cathode active material and preparation and application thereof
  • Preparation method of phosphate-coated metal-doped ternary cathode active material and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] (a) 2g nano-alumina (D50 particle size is 50nm) and 98g LiNi 0.87 co 0.03 mn 0.10 o 2 The ternary cathode material (D50 particle size 9 μm) is dispersed in a mixed solution of 120ml ethanol and water (the volume ratio of ethanol to aqueous solution is 7:3), after ultrasonic treatment and evaporation to dryness, heat to 450°C and keep it warm for 2.5h to obtain nano-oxidation Aluminum clad LiNi 0.87 co 0.03 mn 0.10 o 2 Ternary cathode material.

[0059] (b) After ammonium phosphate coarse particles are ground into powder, sieve to obtain D50 particle diameter and be the ammonium phosphate of 8 microns, 3.5g ammonium phosphate (with the mol ratio of nano-alumina is 1.2:1) and step (a) obtain Nano-alumina coated LiNi 0.87 co 0.03 mn 0.10 o 2 After mixing the ternary cathode materials evenly, heat them to 600°C and keep them warm for 2.5h to obtain AlPO 4 Coating, Al 3+ Element-doped LiNi 0.87 co 0.03 mn 0.10 o 2 Ternary cathode material. SEM of materials ...

Embodiment 2

[0066] (a) 3g nano-cerium oxide (D50 particle size 60nm) and 97g LiNi 0.8 co 0.1 mn 0.1 o 2 The ternary positive electrode material (D50 particle size 8 μm) is dispersed in a mixed solution of 150ml ethanol and water (the volume ratio of ethanol and aqueous solution is 8:2), after ultrasonic treatment and evaporation to dryness, heat to 350°C and keep it for 3 hours to obtain nano-cerium oxide Coated LiNi 0.8 co 0.1 mn 0.1 o 2 Ternary cathode material.

[0067] (b) sieve the diammonium hydrogen phosphate coarse particle into powder and obtain the D50 particle diameter as the diammonium hydrogen phosphate of 8 microns, 3g diammonium hydrogen phosphate (with the mol ratio of nano cerium oxide being 1.3:1) and step (a) The obtained nano-ceria coated LiNi 0.8 co 0.1 mn 0.1 o 2 After the ternary cathode material, it was heated to 600°C and kept for 2.5h to obtain CePO 4 Coating, Ce 3+ Element-doped LiNi 0.8 co 0.1 mn 0.1 o 2 Ternary cathode material.

Embodiment 3

[0088] (a) 4g nano strontium oxide (D50 particle size 80nm) and 96g LiNi 0.83 co 0.7 mn 0.10 o 2 The ternary cathode material (D50 particle size 9 μm) was dispersed in a mixed solution of 135ml ethanol and water (the volume ratio of ethanol and aqueous solution was 7:3), after ultrasonic treatment and evaporation to dryness, heated to 380°C and kept for 3 hours to obtain nano-strontium oxide Coated LiNi 0.83 co 0.7 mn 0.10 o 2 Ternary cathode material.

[0089] (b) After grinding the ammonium dihydrogen phosphate coarse particles into powder, sieve to obtain the ammonium dihydrogen phosphate with a D50 particle size of 7 microns, 5.6g diammonium hydrogen phosphate (with the mol ratio of nanometer strontium oxide being 1.25:1) and The LiNi coated with nanometer strontium oxide that step (a) obtains 0.83 co 0.7 mn 0.10 o 2 After the ternary cathode material, it was heated to 600°C and kept for 2.5h to obtain SrHPO 4 Coating, Sr 2+ Element-doped LiNi 0.83 co 0.7 mn...

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Abstract

The invention belongs to the technical field of cathode materials, and specifically discloses a preparation method of a phosphate-coated metal-doped ternary cathode active material. A ternary cathodematerial uniformly coated with nanometer oxide is obtained through sintering after simple liquid phase ultrasonic treatment, the ternary cathode material is uniformly coated with the metal phosphate after high temperature treatment with a phosphoric acid source to obtain a metal ion-doped ternary cathode material. The ion surface diffusion and internal transfer impedance can be reduced through physical coating and cation doping, the side reaction between the electrolyte and the cathode material is reduced, and the layered structure of the material is stabilized, so that the cycle stability andthe rate performance of the ternary cathode material are greatly improved.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery materials, in particular to the positive electrode of lithium ion batteries. Background technique [0002] Under the double pressure of environmental pollution and energy crisis, finding clean and green energy is the direction of the world's common efforts. Lithium-ion batteries play an important role in clean energy, especially for cars powered by lithium-ion batteries, which have developed rapidly in recent years and have proposed a new development path for global energy and environmental issues. The performance of lithium-ion batteries mainly depends on the active substances participating in the electrode reaction, and the development of positive electrode materials is relatively lagging behind that of negative electrodes. Therefore, lithium-ion battery positive electrode materials are particularly critical for the development of lithium-ion batteries. At present, the main positive...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/624H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 张治安赖延清杨幸张伟李劼
Owner CENT SOUTH UNIV
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