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Ternary material coated with coupled carbon nanotube-graphene composite three-dimensional network structure and preparation method thereof

A technology of graphene composite and carbon nanotubes, which is applied in the direction of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, and can solve the problem of reducing the electrochemical performance of materials, poor performance at large rates, and increasing battery impedance, etc. problems, achieve great theoretical guiding significance and engineering application value, improve conductivity and lithium ion diffusion coefficient, and reduce the effect of interface resistance

Active Publication Date: 2017-11-14
SHANDONG YUHUANG NEW ENERGY TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] After long-term research, although the material has good electrochemical performance, there are still problems to be solved urgently in terms of practicality.
Ternary materials are easy to cause oxygen loss and phase transition after delithiation in the first week, resulting in a large irreversible loss in the first week
In addition, the material has low conductivity and poor performance at large magnification
Moreover, ternary materials are prone to cation mixing in the lithium layer, and in a wide range of discharge voltage, it is easy to cause strong side reactions between the organic electrolyte and the electrode material, increasing the impedance of the battery during charge and discharge, and reducing the electrochemical performance of the material. performance

Method used

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  • Ternary material coated with coupled carbon nanotube-graphene composite three-dimensional network structure and preparation method thereof
  • Ternary material coated with coupled carbon nanotube-graphene composite three-dimensional network structure and preparation method thereof
  • Ternary material coated with coupled carbon nanotube-graphene composite three-dimensional network structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Disperse 0.1g of graphene in an organic solvent, ultrasonically disperse for 40 minutes to obtain a graphene dispersion, then add carbon nanotubes with a weight ratio of 0.1g and a small amount of silane coupling agent to the solution, and stir for 30 minutes. Obtain a coupled graphene-carbon nanotube dispersion; at room temperature, dissolve 1.0g of polyvinylpyrrolidone in 50.0g of deionized water, after physical mixing and dispersion, add 50.0g of nickel-cobalt-manganese ternary material, and stir for 40min to obtain Ternary material dispersion;

[0036] (2) Pour the coupled graphene-carbon nanotube dispersion into the ternary material dispersion. After dispersing for 10 minutes, place it in a constant temperature stirrer and stir at 80°C to evaporate the solvent;

[0037] (3) After grinding the above product, sieve it with 400 mesh, put it in a nitrogen atmosphere and sinter it, raise the temperature to 300°C at 2°C / min, and keep it warm for 5 hours. After natur...

Embodiment 2

[0045] The difference between this embodiment and Example 1 is the ratio of the graphene-carbon nanotube composite material selected in step one. The specific preparation method is as follows:

[0046] The graphene of 0.067g is dispersed in the organic solvent, ultrasonic dispersion 40min obtains graphene dispersion liquid and then adds the carbon nanotube that weight ratio is 0.133g in the solution, and a small amount of silane coupling agent, stirs 30min, obtains the coupled Graphene-carbon nanotube dispersion liquid; at room temperature, dissolve 1.0g polyvinylpyrrolidone in 50.0g deionized water, after physical mixing and dispersion, add 50.0g nickel-cobalt-manganese ternary material, stir for 40min to obtain ternary material dispersion liquid;

[0047] The other steps are the same as in Example 1 to obtain the positive electrode material in the present invention, that is, Gs-CNTs(12)@LNCM.

Embodiment 3

[0049] The difference between this embodiment and Example 1 is the ratio of the graphene-carbon nanotube composite material selected in step one. The specific preparation method is as follows:

[0050] The graphene of 0.05g is dispersed in the organic solvent, acoustic dispersion 40min obtains the graphene dispersion liquid and then adds the carbon nanotube that is 0.15g in weight ratio to the solution, and a small amount of silane coupling agent, stirs 30min, obtains the coupled Graphene-carbon nanotube dispersion liquid; at room temperature, dissolve 1.0g polyvinylpyrrolidone in 50.0g deionized water, after physical mixing and dispersion, add 50.0g nickel-cobalt-manganese ternary material, stir for 40min to obtain ternary material dispersion liquid;

[0051] Other steps are the same as in Example 1 to obtain the positive electrode material in the present invention, that is, Gs-CNTs(13)@LNCM.

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Abstract

The invention relates to the technical field of battery materials, and particularly discloses a ternary material coated with a coupled carbon nanotube-graphene composite three-dimensional network structure and a preparation method thereof. The ternary material covered by the coupled carbon nanotube-graphene composite three-dimensional network structure uses nickel-cobalt-manganese ternary material, carbon nanotubes and graphene as raw materials, and is characterized in that: polyvinylpyrrolidone is used as a dispersant, At the same time, the silane coupling agent is used to connect graphene and carbon nanotubes through liquid phase self-assembly to form a three-dimensional network structure, and then the coupled carbon nanotube-graphene composite material and nickel-cobalt-manganese ternary material are passed through After the physical method is uniformly dispersed, it is coated on the surface of the nickel-cobalt-manganese ternary material, placed in an inert atmosphere and sintered to obtain a uniformly coated product. The product of the invention has high discharge specific capacity and long cycle life, and its preparation process is simple and easy for large-scale production.

Description

(1) Technical field [0001] The invention relates to the technical field of battery materials, in particular to a ternary material coated with a coupled carbon nanotube-graphene composite three-dimensional network structure and a preparation method thereof. (2) Background technology [0002] With the advancement of science and technology, the requirements for energy storage devices in the fields of electronic products, electric vehicles, medical equipment, and aerospace are increasing. Lithium-ion batteries with high energy density, small size, and long cycle life have been widely used. After satisfying the safety, environmental protection, cost, life and other aspects, the key performance indicators are high energy density and fast discharge capability. For example, the United States, Japan and other countries require the energy density of the next generation of lithium-ion power batteries to reach 300Wh / kg, which is the current development of LiFePO 4 More than 2 times the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/38H01M4/625H01M4/628H01M10/0525H01M4/36H01M4/62Y02E60/10
Inventor 王文阁宋春华王瑛乔文灿赵成龙冯涛张智辉赵艳丽
Owner SHANDONG YUHUANG NEW ENERGY TECH
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