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Battery negative electrode material and preparation method thereof

A battery negative electrode and spiral technology, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of affecting the electrical properties of electrode materials, titanium dioxide agglomeration, and large environmental pollution

Active Publication Date: 2021-02-02
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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Problems solved by technology

However, this patented technology has the following disadvantages: (a) nitric acid is used when activating the modified helical nano-carbon fiber, which causes great environmental pollution and is not conducive to environmental protection; (b) the residual nitric acid on the surface of the helical carbon fiber will react with absolute ethanol in the subsequent hydrothermal reaction The reaction takes place to produce impurity products (oily liquid nitroethane), which is not conducive to obtaining high-purity products, thereby affecting the electrical properties of electrode materials; (c) the hydrothermal reaction time of this method is too long, and no hydrolysis inhibitor is used, which is easy It leads to the agglomeration of titanium dioxide, and the uniform coating of titanium dioxide on the surface of the helical carbon nanofiber cannot be achieved, thus affecting the electrical properties of the electrode material

Method used

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  • Battery negative electrode material and preparation method thereof
  • Battery negative electrode material and preparation method thereof
  • Battery negative electrode material and preparation method thereof

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preparation example Construction

[0028] The invention provides a preparation method of battery negative electrode material, comprising the following steps:

[0029] heat-treating the helical carbon nanofibers to obtain modified helical carbon nanofibers;

[0030] The modified helical nano-carbon fiber, butyl titanate, solvent and glacial acetic acid are mixed and then subjected to solvothermal reaction to obtain the negative electrode material of the battery; the solvent includes a first solvent and a second solvent.

[0031] In the present invention, unless otherwise specified, the raw materials used in the present invention are conventional commercially available products.

[0032] In the invention, the helical nano carbon fiber is heat-treated to obtain the modified helical nano carbon fiber. In the present invention, the helical carbon nanofibers are preferably prepared, and the preparation method of the helical carbon nanofibers preferably includes the following steps:

[0033] Using acetylene as a car...

Embodiment 1

[0074] Preparation of battery anode materials:

[0075] HCNFs (helical diameter 80nm) in a vacuum of 1 × 10 -1 Pa, heat treatment at 600°C for 2 hours to obtain modified HCNFs;

[0076] Ultrasonic dispersion of 0.5g modified HCNFs with 85mL ethanol and 3mL water at 180W for 30min to obtain a modified HCNFs dispersion;

[0077] Ultrasonic disperse 4mL butyl titanate and 50mL absolute ethanol at 180W for 30min to obtain a butyl titanate solution;

[0078] Stir the modified HCNFs dispersion and butyl titanate solution in an oil bath at 45°C at a speed of 350r / min for 30min, then add 3mL of glacial acetic acid for solvothermal reaction (100°C, 4h); After the product was air-cooled to room temperature, it was suction filtered and washed (absolute ethanol). When the acidity and alkalinity of the filtrate reached neutral, it was dried at 70°C for 6 hours to obtain the battery negative electrode material (TiO 2@HCNFs).

[0079] To prepare a sodium-ion battery:

[0080] Mix the ne...

Embodiment 2

[0084] Preparation of battery anode materials:

[0085] HCNFs (helical diameter 80nm) in a vacuum of 1 × 10 -1 Pa, heat treatment at 700°C for 3 hours to obtain modified HCNFs;

[0086] Ultrasonic dispersion of 0.5g modified HCNFs with 90mL absolute ethanol and 3mL water at 180W for 30min to obtain a modified HCNFs dispersion;

[0087] Ultrasonic disperse 6mL butyl titanate and 50mL absolute ethanol at 180W for 30min to obtain a butyl titanate solution;

[0088] Stir the modified HCNFs dispersion and butyl titanate solution in an oil bath at 45°C at a speed of 400r / min for 30min, then add 3mL of glacial acetic acid for solvothermal reaction (100°C, 6h); After the product was air-cooled to room temperature, it was suction filtered and washed (absolute ethanol). When the acidity and alkalinity of the filtrate reached neutral, it was dried at 75°C for 4 hours to obtain the battery negative electrode material (TiO 2 @HCNFs).

[0089] To prepare a sodium-ion battery:

[0090] ...

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Abstract

The invention relates to the technical field of batteries, and particularly relates to a battery negative electrode material and a preparation method thereof. The preparation method comprises the following steps: carrying out heat treatment on spiral carbon nanofibers to obtain modified spiral carbon nanofibers; and by taking modified spiral carbon nanofibers as a matrix and butyl titanate as a titanium source, loading TiO2 nanoparticles on the surfaces of the modified spiral carbon nanofibers through a low-temperature solvothermal method to form the spiral carbon nanofiber loaded TiO2 composite battery negative electrode material. According to the invention, the spiral carbon nanofibers have a special spiral structure and a large specific surface area, and are mutually stacked to form a three-dimensional reticular support structure so that the dispersity of nano TiO2 can be improved, and meanwhile, a large amount of nano TiO2 can provide more two-dimensional diffusion channels for sodium ions. Through related tests, the prepared sodium battery has excellent specific capacity and cycling stability.

Description

technical field [0001] The invention relates to the field of battery technology, in particular to a battery negative electrode material and a preparation method thereof. Background technique [0002] With the rapid development of science and the improvement of people's living standards, my country's energy industry, especially the new energy industry, has also developed rapidly, from smart phones to electric vehicles to smart grids and other fields are booming. At the same time, the problems of resource consumption and environmental pollution have become increasingly prominent. This makes new energy green storage technology a hot spot in the development of science and technology, and the research and development of lithium / sodium ion batteries in these energy storage technologies is the focus of current work in the field of new energy devices and new materials. Currently loading TiO on the surface of graphene, carbon nanotubes, porous carbon and other traditional carbon mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/583H01M10/054B82Y30/00
CPCH01M4/366H01M4/583H01M4/483H01M10/054B82Y30/00H01M2004/027Y02E60/10
Inventor 金永中李裕铭房勇龚勇陈建李瑞
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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