Lithium ion battery negative electrode material and preparation method thereof

A technology for lithium-ion batteries and negative electrode materials, which is applied in battery electrodes, secondary batteries, and nanotechnology for materials and surface science. In order to achieve the effect of maintaining phase stability and dimensional advantages, increasing conductivity, and inhibiting agglomeration

Pending Publication Date: 2022-07-08
合肥国轩科宏新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, pure titanium dioxide still has the problem of poor rate performance and cycle performance as an anode material. Generally, pure titanium dioxide materials are modified by coating and compounding. However, due to the problem of easy agglomeration of titanium dioxide, these composite materials The material has uneven dispersion of single particles, resulting in extremely limited improvement in rate performance and cycle performance

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  • Lithium ion battery negative electrode material and preparation method thereof
  • Lithium ion battery negative electrode material and preparation method thereof
  • Lithium ion battery negative electrode material and preparation method thereof

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preparation example Construction

[0035] A first aspect of the present invention discloses a method for preparing a negative electrode material for a lithium ion battery. The main steps are as follows:

[0036] Preparation of anatase octahedral TiO 2

[0037] Octahedral TiO 2 Compared with ordinary titanium dioxide or titanium dioxide arrays, its structure is more stable, and as a battery material, it can increase the number of charge-discharge cycles of the material, and the capacity attenuation is small; and its specific surface area is large, which can provide more space for ion reactions and area. Octahedral TiO in this paper 2 It can be obtained by a conventional preparation process in the field, and there is no special limitation. In some specific embodiments of the present invention, the specific preparation method is as follows: first, the titanium source and benzoic acid are respectively added into acetonitrile and mixed uniformly to form a solution. a and solution b; adding the solution a into ...

Embodiment 1

[0048] Preparation of octahedral TiO 2

[0049] Mix 0.625mL of titanium tetraisopropoxide with 4.08mL of acetonitrile and stir evenly, marked as solution a; add 2.268g of benzoic acid to 20.36mL of acetonitrile and stir evenly, marked as solution b; mix solution a and solution b, stir After about 30 minutes, the mixed solution was transferred to the reaction kettle and kept at 100°C for 15 hours; when the reaction stopped and cooled to room temperature, washed several times with acetonitrile and dried at room temperature to obtain the titanium dioxide precursor;

[0050] Weigh 0.061 g of titanium dioxide precursor, add 2 mL of DMF, and stir for tens of minutes. After waiting for the solution to be uniform, add 2.25 mL of NaF with a concentration of 0.8 mol / L and 5.75 mL of ultrapure water to it. After stirring evenly, transfer the mixture. In the reaction kettle, after reacting at 180 °C for 24 h, cooled to room temperature, the white precipitate was collected by centrifuga...

Embodiment 2

[0060] Preparation of octahedral TiO 2

[0061] Mix 0.625mL of titanium tetraisopropoxide with 4.08mL of acetonitrile and stir evenly, marked as solution a; add 2.268g of benzoic acid to 20.36mL of acetonitrile and mix and stir evenly, marked as solution b; mix solutions a and b, After stirring for about 30min, the mixed solution was transferred to the reaction kettle and kept at 100°C for 15h; when the reaction stopped naturally cooled to room temperature, washed several times with acetonitrile, and dried at room temperature to obtain the titanium dioxide precursor;

[0062] Weigh 0.061 g of titanium dioxide precursor, add it to 2 mL of DMF and stir for tens of minutes, wait for the solution to be uniform, add 1 mL of NaF with a concentration of 0.8 mol / L and 7 mL of ultrapure water to it, stir evenly, and then transfer the mixture to a In the reaction kettle, react at 180°C for 20 hours. After cooling to room temperature, the white precipitate is collected by centrifugati...

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Abstract

The invention discloses a lithium ion battery negative electrode material and a preparation method thereof, and the preparation method comprises the following steps: mixing anatase octahedral TiO2 with a carbon source and water, and carrying out a hydrothermal reaction to obtain a TiO2 (at) C composite material, namely carbon-coated titanium dioxide; then dispersing the TiO2 (at) C composite material in the graphene oxide solution to obtain a uniformly dispersed mixed solution, and then performing freeze drying and high-temperature calcination to obtain the TiO2 (at) C (at) rGO composite material. The TiO2 (at) C (at) rGO composite material is a composite material of mesoporous carbon coated titanium dioxide and graphene, and is used as a negative electrode material of a lithium ion battery, so that the rate capability and the cycle performance of the lithium ion battery can be obviously improved.

Description

technical field [0001] The invention belongs to the technical field of negative electrode materials for lithium ion batteries, in particular to a method for preparing a negative electrode material for lithium ion batteries, and also relates to a negative electrode material for lithium ion batteries prepared by the preparation method, and the negative electrode material for lithium ion batteries used in lithium ion batteries. applications in . Background technique [0002] With the rapid development of the new energy industry, lithium-ion batteries have received extensive attention and applications due to their high energy density and good cycle performance. As one of the four key materials in lithium-ion batteries, the negative electrode material is mainly used as the carrier of lithium ions and electrons in the battery charging process, plays the role of energy storage and release, and is a key part that affects the performance of lithium-ion batteries. [0003] At present...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/583H01M10/0525B82Y30/00B82Y40/00
CPCH01M4/366H01M4/483H01M4/583H01M10/0525B82Y30/00B82Y40/00H01M2004/027Y02E60/10
Inventor 毕希饶媛媛贾宝成
Owner 合肥国轩科宏新能源科技有限公司
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