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Metal-organic framework material coated ternary positive electrode material and preparation method thereof

A cathode material and organic framework technology, applied in the field of new energy materials, can solve the problems of corrosion and irreversible side reactions of electrolyte, and achieve the effect of increasing capacity, excellent cycle stability, and preventing the contact of cathode materials.

Active Publication Date: 2019-08-23
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem in the prior art that the surface of the positive electrode material of the battery is prone to irreversible side reactions with the electrolyte, thereby causing corrosion, and to provide a new method for preparing a metal-organic framework material-coated ternary positive electrode material. The material adopts solvothermal precipitation method, the thickness of the coating layer is uniform, the process is simple, the cost is low, and it is convenient for industrial production

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  • Metal-organic framework material coated ternary positive electrode material and preparation method thereof

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Embodiment 1

[0034] In this embodiment, the preparation method of metal-organic framework material-coated ternary cathode material includes the following steps:

[0035] (1) 500mg ternary cathode material LiNi 0.6 co 0.2 mn 0.2 0 to 50ml of absolute ethanol and N,N-dimethylformamide mixed solution, the volume ratio of absolute ethanol and N,N-dimethylformamide is 1:49, stirred for 1h to obtain the first dispersion;

[0036] (2) Under stirring conditions, 35 μl of zirconium n-propoxide (70wt.% n-propanol solution), 42 mg of benzoic acid, and 12 mg of terephthalic acid were added to the first dispersion, and stirred for 2 hours to obtain a uniformly stirred second dispersion liquid. Wherein the molar ratio of zirconium atom, benzoic acid, terephthalic acid is 1:12:2.5;

[0037] (3) Transfer the uniform dispersion in (2) to a reaction kettle with a polytetrafluoroethylene liner for solvothermal reaction. The reaction condition is 120 ° C for 8 hours, and the temperature is naturally coole...

Embodiment 2

[0044] A method for preparing a metal-organic framework material-coated ternary positive electrode material, comprising the following steps:

[0045] (1) 500mg ternary cathode material LiNi 0.6 co 0.2 mn 0.2 O was dispersed in 50ml of anhydrous ethanol and N,N-dimethylformamide mixed solution, the volume ratio of absolute ethanol and N,N-dimethylformamide was 1:49, and stirred for 1h to obtain a uniform dispersion;

[0046] (2) Under stirring conditions, 35 μl of zirconium n-propoxide (70 wt.% n-propanol solution), 17.5 mg of benzoic acid, and 4.8 mg of terephthalic acid were added to the dispersion, and stirred for 2 hours to obtain a uniformly stirred dispersion. The molar ratio of zirconium atom, benzoic acid and terephthalic acid is 1:5:1.

[0047] (3) Transfer the uniform dispersion in (2) to a reaction kettle with a polytetrafluoroethylene liner for solvothermal reaction. The reaction condition is 120 ° C for 8 hours, and the temperature is naturally cooled to 40 ° C ...

Embodiment 3

[0052] A method for preparing a metal-organic framework material-coated ternary positive electrode material, comprising the following steps:

[0053] (1) 500mg ternary cathode material LiNi 0.6 co 0.2 mn 0.2 O was dispersed in 50ml of anhydrous ethanol and N,N-dimethylformamide mixed solution, the volume ratio of absolute ethanol and N,N-dimethylformamide was 1:49, and stirred for 1h to obtain a uniform dispersion;

[0054] (2) Under stirring conditions, 35 μl of zirconium n-propoxide (70 wt.% n-propanol solution), 52.5 mg of benzoic acid, and 24 mg of terephthalic acid were added to the dispersion, and stirred for 2 hours to obtain a uniformly stirred dispersion. Wherein the molar ratio of zirconium atom, benzoic acid and terephthalic acid is 1:15:5.

[0055] (3) Transfer the uniform dispersion in (2) to a reaction kettle with a polytetrafluoroethylene liner for solvothermal reaction. The reaction condition is 120 ° C for 8 hours, and the temperature is naturally cooled to...

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Abstract

The invention discloses a metal-organic framework material coated ternary positive electrode material and a preparation method thereof. The preparation method comprises the following steps: (1) uniformly dispersing a ternary positive electrode material in a mixed solution of absolute ethyl alcohol and N, N-dimethyl formamide; (2) sequentially adding zirconium salt and an organic ligand into the dispersion liquid under a stirring condition, and performing complete stirring; (3) transferring the uniform dispersion obtained at the step (2) into a reaction kettle, and carrying out solvothermal reaction; (4) taking out the reaction kettle, collecting a bottom product, performing centrifugal washing, and drying the centrifuged product to obtain the metal-organic framework material coated ternarypositive electrode material. According to the method provided by the invention, a layer of metal can be uniformly coated on the surface of the ternary positive electrode material, and the thickness of the coating can be controlled. Through the ternary positive electrode material modified on the surface of the organic framework material, the method can effectively reduce corrosion and decomposition of the ternary positive electrode material in an electrolyte and improve the cycle stability of a battery.

Description

technical field [0001] The invention belongs to the technical field of new energy materials, and in particular relates to a metal-organic framework material-coated ternary cathode material and a preparation method thereof Background technique [0002] Lithium-ion batteries have a series of excellent properties such as high working voltage, large specific energy, long cycle life, green pollution-free and no memory effect, which also makes lithium-ion batteries widely used as power sources for various electronic products. As one of the core components of batteries, electrode materials have a major impact on the overall performance of batteries. At this stage, the nickel-cobalt-manganese ternary cathode material has shown great advantages in the cathode material series, which has great advantages in high energy, long cycle life and high safety. However, like most battery cathode materials, irreversible side reactions will occur at the interface between the electrode material a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/60
CPCH01M4/38H01M4/60Y02E60/10
Inventor 吴浩斌赵博刘倩倩许亦非
Owner ZHEJIANG UNIV
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