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Wood carbon fiber/metal oxide composite negative electrode material and its preparation method and application

A technology of negative electrode material and wood charcoal, which is applied in the manufacture of electrolyte batteries, battery electrodes, and final product manufacture, etc. problem, to achieve the effect of rapid radial ion diffusion, simple and easy process, and unique anisotropy

Active Publication Date: 2021-02-26
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Some researchers have tried to directly pyrolyze biomass raw materials to obtain carbon anode materials. However, the shape of the carbon anode material is irregular, and it is difficult to fully exert the characteristics of large specific capacity and excellent rate performance when applied to anode materials.
For example, the Chinese patent document with the publication number CN107623105A uses biological waste (such as taro stems, rice husks, etc.) Moreover, the particle size of the carbon material is large and the shape is irregular, so it is difficult to give full play to the advantages of the biomass carbon material
The Chinese patent document whose publication number is CN106948032A uses commercial cellulose as a raw material to prepare carbon fiber negative electrode materials through catalytic graphitization. The carbon fiber negative electrode materials prepared by this method have inconspicuous fibrous morphology and small specific capacity (368 mAh / g ) and other characteristics, it is difficult to really replace the existing graphite anode materials

Method used

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  • Wood carbon fiber/metal oxide composite negative electrode material and its preparation method and application
  • Wood carbon fiber/metal oxide composite negative electrode material and its preparation method and application
  • Wood carbon fiber/metal oxide composite negative electrode material and its preparation method and application

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preparation example Construction

[0038] A kind of preparation method of wood charcoal fiber / metal oxide composite negative electrode material of the present invention, comprises the following steps:

[0039] (1) Disperse the wood charcoal fiber in the aqueous solution with surface modifier, then add the metal salt, stir and mix evenly, put it in the reaction vessel, carry out the hydrothermal reaction at 120℃~160℃, on the surface of the wood charcoal fiber After in-situ growth of the metal oxide precursor, a precipitate is obtained;

[0040] (2) After the precipitate obtained in step (1) is filtered and dried, the temperature is raised to 400° C. to 600° C. for sintering under a protective gas atmosphere to obtain a wood carbon fiber / metal oxide composite negative electrode material.

[0041] The preparation method of the invention can improve the defect of low tap density after pyrolysis and carbonization in the biomass raw material, and significantly improve the volume energy density of the negative electro...

Embodiment 1

[0043]A wood-charcoal fiber / metal oxide composite anode material of this embodiment, the wood-charcoal fiber has a diameter of 1 μm to 10 μm, and NiO nanoparticles are uniformly distributed on the surface of the wood-charcoal fiber to form a three-dimensional composite structure. When the charge and discharge current is 50mA / g, the first discharge specific capacity reaches 978.7 mAh / g, and the charge specific capacity is 633.2 mAh / g.

[0044] A preparation method of the wood charcoal fiber / metal oxide composite negative electrode material of the present embodiment, comprising the following steps:

[0045] (1) Disperse 1 g of wood charcoal fiber in 60 mL of aqueous solution with 0.1 g of cetyltrimethylammonium bromide (CTAB), then add 2 g of nickel nitrate, and mix evenly with ultrasonic stirring to obtain a mixed solution. Then the mixed solution was put into a hydrothermal reaction kettle, and the hydrothermal reaction was carried out at 120 °C for 12 h, and the NiO precursor...

Embodiment 2

[0055] A preparation method of the wood charcoal fiber / metal oxide composite negative electrode material of the present embodiment, comprising the following steps:

[0056] (1) Disperse 1 g of wood charcoal fiber in 60 mL of aqueous solution with 0.1 g of CTAB, then add 1 g of nickel nitrate, and mix evenly with ultrasonic stirring to obtain a mixed solution, and then put the mixed solution into a hydrothermal reaction kettle, The hydrothermal reaction was carried out at 120 °C for 6 h, and the NiO precursor was grown in situ on the surface of woody carbon fibers to obtain precipitates.

[0057] (2) After the precipitate obtained in step (1) was filtered, washed, and dried, it was put into a tube furnace with argon for sintering, and the temperature was raised to 400 °C at 10 °C / min and kept for 3 h, then cooled to room temperature to obtain Wood carbon fiber / metal oxide composite anode material.

[0058] In this embodiment, the wood charcoal fiber is wood charcoal fiber. Th...

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Abstract

The invention discloses a woody carbon fiber / metal oxide composite negative electrode material. The woody carbon fiber in the woody carbon fiber / metal oxide composite negative electrode material has a diameter of 1 μm to 10 μm, and metal oxide nanoparticles are evenly distributed on the carbon fiber. surface. The invention also discloses a preparation method of the aforementioned composite negative electrode material. The composite negative electrode material of the invention has large specific capacity, excellent rate performance and high volumetric energy density.

Description

technical field [0001] The invention relates to the field of lithium ion battery materials, in particular to a wood carbon fiber / metal oxide composite negative electrode material and its preparation method and application. Background technique [0002] In recent years, the rapid development of portable electronic products such as mobile phones, tablet computers, and notebook computers, as well as the continuous popularization of new energy electric vehicles, have continuously increased the demand for energy storage systems. As one of the power sources of new energy vehicles, lithium-ion batteries have been included in my country's "National Medium and Long-term Science and Technology Development Program" (2006-2020). Graphite is widely used as an anode material for lithium-ion batteries because of its good stability and long cycle life. However, due to the theoretical specific capacity of graphite is only 372 mAh / g, the graphite anode material has been unable to meet the in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/58H01M4/587H01M10/0525H01M10/058
CPCY02E60/10Y02P70/50
Inventor 胡进波张翔刘贡钢苌姗姗李贤军刘元
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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