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A kind of preparation method and application of titanium carbide/carbon nano film material

A carbon nano-film, titanium carbide technology, applied in electrochemical generators, active material electrodes, structural parts, etc., to achieve high strength, good conductivity, and improve overall energy density.

Active Publication Date: 2022-03-29
湖北长界新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The above-mentioned existing technologies all need to dope lithium metal compounds in TiC / C composite materials, and no prior art has been found to prepare flexible TiC / C nano-membrane materials without metal lithium compounds as lithium-ion self-supporting electrode materials. report

Method used

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  • A kind of preparation method and application of titanium carbide/carbon nano film material
  • A kind of preparation method and application of titanium carbide/carbon nano film material

Examples

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Embodiment 1

[0028] The method for preparing titanium carbide / carbon nano film material in this embodiment comprises the following steps:

[0029] S1. At 70°C, mix polyacrylonitrile (PAN), polyethylene oxide (PEO), polybenzimidazole (PBI), titanyl sulfate and N,N-dimethylformamide (DMF) according to the mass ratio Mix 3:1:1:6:30 and stir evenly for 12 hours to form a spinning precursor solution; electrospin the spinning precursor solution to obtain a precursor film, place it at 60±5°C for 12 hours in vacuum, and set aside;

[0030] S2. In an air atmosphere, the above-mentioned spinning precursor film is heated to 280°C at a rate of 1°C / min and kept for 2h; under a nitrogen atmosphere, the temperature is raised to 600±50°C at a rate of 2°C / min and kept for 2h to obtain TiO 2 / C nano film material;

[0031] S3, under argon atmosphere, the TiO 2 / C nano-membrane material was heated to 1400°C at a rate of 5°C / min and kept for 6h to obtain titanium carbide / carbon nano-membrane material.

[...

Embodiment 2

[0036] The method for preparing titanium carbide / carbon nanofilm material in this embodiment is basically the same as that in Example 1, except that the mass ratio of PAN, PEO, PBI, titanyl sulfate and DMF in step S1 is 1:1:1:6 :30.

[0037] The titanium carbide / carbon nano-film material prepared according to the method of Example 1 is assembled into a lithium-ion half-cell in a glove box, and the electrical properties of the lithium-ion half-cell are measured, and it is still cycled for 200 cycles at a current density of 0.1A / g. It has a capacity of 490mAh / g.

Embodiment 3

[0039] The method for preparing titanium carbide / carbon nanofilm material in this embodiment is basically the same as that in Example 1, except that the mass ratio of PAN, PEO, PBI, titanyl sulfate and DMF in step S1 is 10:5:5:6 :30.

[0040] The titanium carbide / carbon nano-film material prepared according to the method of Example 1 is assembled into a lithium-ion half-cell in a glove box, and the electrical properties of the lithium-ion half-cell are measured, and it is still cycled for 200 cycles at a current density of 0.1A / g. It has a capacity of 502mAh / g.

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Abstract

The invention provides a preparation method and application of a titanium carbide / carbon nano-film material. The nano-film material is prepared by reacting polyacrylonitrile, polyethylene oxide, polybenzimidazole and a titanium source in DMF according to a defined concentration. Spinning precursor solution, electrospinning the spinning precursor solution to obtain a precursor film, drying the precursor film and pre-oxidizing in the air, and then calcining at high temperature in two steps in an inert gas atmosphere to obtain a three-dimensional network Titanium carbide / carbon nanofilm material with a structure. The titanium carbide / carbon nano-film material is used as a self-supporting material for the negative electrode of lithium-ion batteries. Inactive materials such as junction agent and conductive agent greatly improve the overall energy density of the battery.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a method for preparing a titanium carbide / carbon nano-film material and using the material as a self-supporting negative electrode material for lithium-ion batteries Background technique [0002] At present, the anode materials of commercial lithium-ion batteries need to use copper foil as a current collector to enhance the conductivity of the material and improve its mechanical strength. However, copper foil accounts for a large mass in the entire battery system and cannot provide capacity. In the context of the increasingly mature development of negative electrode materials, the industry has been using various methods to reduce the thickness of copper foil, thereby increasing the overall energy density of the battery. Therefore, there is an urgent need to develop self-supporting materials to completely abandon the current collector so as to greatly improve the overall ener...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/587H01M4/62H01M10/0525
CPCH01M4/587H01M4/625H01M10/0525H01M2004/027Y02E60/10
Inventor 余佳阁杨宇航丁瑜张贤王锋
Owner 湖北长界新材料有限公司
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