Lithium ion battery ternary material with double-coated surface and preparation method thereof

A technology of lithium-ion batteries and ternary materials, applied in electrical components, battery electrodes, secondary batteries, etc., can solve problems such as easy peeling off of the coating layer, cumbersome process, discounted coating effect, etc., to improve capacity and stability , uniform particle size distribution, and the effect of improving uniformity

Inactive Publication Date: 2018-03-06
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The existing coating methods are not easy to obtain a uniform coating layer and controllable nano-scale coating substances. The compatibility between the coated substance and the main material is not good or stable enough, which leads to the coating layer falling off easily, and the coating The effect is greatly reduced
[0004] The Chinese invention patent with the publication number CN107086298A discloses a core-shell heterogeneous material composed of layered lithium-rich manganese base and spinel lithium manganese oxide. Due to the large difference in the structure of the two materials, the coating effect is not good; Moreover, the structure of lithium-rich layered oxides is unstable, and the long-term cycle performance cannot meet the demand.
The Chinese invention patent whose publication number is CN104953112A discloses a kind of AlF 3 A method for preparing the precursor of a coated porous spherical lithium-ion battery material. The subsequent high-temperature sintering process of mixed lithium will affect the AlF 3 The cladding layer causes damage and affects the cladding effect, and the precursor material and AlF 3 Layer coating compatibility is poor, resulting in greatly reduced coating effect
The Chinese invention patent with the publication number CN104218233A discloses a method of coating AlF on the surface of a mixture of nickel-cobalt lithium manganese oxide and lithium cobalt oxide. 3 method, this method is followed by drying by spraying, the process is more cumbersome

Method used

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  • Lithium ion battery ternary material with double-coated surface and preparation method thereof
  • Lithium ion battery ternary material with double-coated surface and preparation method thereof
  • Lithium ion battery ternary material with double-coated surface and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Disperse citric acid (total metal ion molar ratio of lithium, nickel and manganese is 3:1) in deionized water evenly to obtain a dispersion; under the action of ultrasound and stirring, add 0.05mol in parallel to the dispersion Lithium acetate solution, nickel acetate solution and manganese acetate solution of / L, keep stirring until gel appears (wherein, ultrasonic frequency is 40kHz, and ultrasonic power is 450W, and stirring speed is 450r / min; Lithium ion, nickel ion and manganese ion The molar ratio is 6:1:3);

[0044] Will LiNi 0.6 co 0.2 mn 0.2 o 2 The ternary material was immersed in the above gel, and the mixture was continuously stirred for 20 minutes. The resulting mixture was dried and tempered. The tempering temperature was 700°C. 0.6 co 0.2 mn 0.2 o 2 Formation of Li on the surface of ternary materials 1.2 Ni 0.2 mn 0.6 o 2 (lithium-rich layered oxide) cladding layer; weigh the compound after tempering and disperse it in ethanol solvent, and stir...

Embodiment 2

[0050] Disperse polyvinylpyrrolidone (total metal ion molar ratio of lithium, nickel and manganese is 2:1) in ethanol solvent to obtain a dispersion liquid; add concentration of 0.04mol / L to the dispersion liquid under the action of ultrasound and stirring Lithium chloride solution, nickel chloride solution and manganese chloride solution, keep stirring until gel appears (wherein, ultrasonic frequency is 40kHz, and ultrasonic power is 400W, and stirring speed is 400r / min; Lithium ion, nickel ion and manganese ion The molar ratio is 3:1:1);

[0051] Will LiNi 0.5 co 0.2 mn 0.3 o 2 The ternary material was immersed in the above gel and kept stirring for 20 minutes. The resulting mixture was dried and tempered. The tempering temperature was 750°C. 0.5 co 0.2 mn 0.3 o 2 Formation of Li on the surface of ternary materials 1.2 [Ni 1 / 2 mn 1 / 2 ] 0.8 o 2 Coating layer; weigh the tempered compound and disperse it in deionized water, stir it ultrasonically to make it evenly d...

Embodiment 3

[0054] Disperse tartaric acid (total metal ion molar ratio of lithium, nickel, cobalt, and manganese is 4:1) in ethanol solvent to obtain a dispersion; under the action of ultrasound and stirring, add the concentration of 0.05 to the dispersion in parallel. mol / L lithium chloride solution, nickel chloride solution and manganese chloride solution, keep stirring until gel appears (wherein, ultrasonic frequency is 50kHz, ultrasonic power is 500W, and stirring speed is 400r / min; Lithium ion, nickel ion, The molar ratio of cobalt ions and manganese ions is according to Li 1.2 [Ni 1 / 3 co 1 / 3 mn 1 / 3 ] 0.8 o 2 Add to);

[0055] Will LiNi 0.8 co 0.1 mn 0.1 o 2 The ternary material was immersed in the above gel and kept stirring for 20 minutes. The resulting mixture was dried and tempered. The tempering temperature was 650°C. 0.8 co 0.1 mn 0.1 o 2 Formation of Li on the surface of ternary materials 1.2 [Ni 1 / 3 co 1 / 3 mn 1 / 3 ] 0.8 o 2 Coating layer; weigh the tempere...

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Abstract

The invention discloses a lithium ion battery ternary material with a double-coated surface. The lithium ion battery ternary material with the double-coated surface comprises a nickel-cobalt-manganeseternary material, wherein a lithium-rich layered oxide coating layer is covered on a surface of the nickel-cobalt-manganese ternary material; an aluminum fluoride coating layer is covered on a surface of the lithium-rich layered oxide coating layer; the lithium ion battery ternary material with the double-coated surface is not easy to fall off, and has good chemical stability and high capacity. The invention also discloses a preparation method of the lithium ion battery ternary material. The method comprises the steps of firstly adopting an organic complexing agent-auxiliary sol-gel method for covering lithium-rich layered oxide on the surface of the ternary material so as to form the lithium-rich coating layer; then using a liquid phase method for coating aluminum fluoride on the surfaceof the lithium-rich layered oxide coating layer, and obtaining the double-coated lithium ion battery ternary material. The preparation method is simple in process, high in operation feasibility, andhigh in element utilization rate.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a double-coated lithium-ion battery ternary material on the surface and a preparation method thereof. Background technique [0002] Due to the serious problems of environmental pollution and the increasingly scarce fossil fuel resources, replacing the increasingly depleted fossil energy with green energy has become the direction of new energy development in various countries. Since the advent of commercial lithium-ion batteries in the 1990s, the lithium-ion battery industry has developed rapidly in a short period of time and has been widely used in communications, energy storage, 3C electronic products, and electric vehicles. The current commercial lithium battery materials mainly include lithium cobalt oxide, lithium manganese oxide, lithium iron phosphate, and ternary materials. Among them, ternary materials have high specific capacity, energy density and power d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 胡国荣杜柯彭忠东曹雁冰亓先跃胡凯华
Owner CENT SOUTH UNIV
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