A kind of high-performance lithium-ion battery aluminum-based negative electrode material and preparation method thereof

A lithium-ion battery and negative electrode technology, which is applied in the field of high-performance lithium-ion battery aluminum-based negative electrode materials and its preparation, can solve the problems of unfavorable high-capacity negative electrode materials, difficulty in preparing Al nanostructures, and poor cycle stability. Excellent cycle stability and rate performance, improved conductivity, and good mechanical properties

Active Publication Date: 2021-08-10
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
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Problems solved by technology

[0004] However, the work of Al-based anodes with high capacity and good cycle stability has been rarely reported, mainly due to the following reasons: (1) Metal Al will undergo a huge volume change during the lithium-ion deintercalation process, resulting in The mechanical stress will destroy the electrode structure, pulverize, and eventually lead to capacity fading and poor cycle stability; (2) The dense oxide layer on the surface of metal Al is an insulator of lithium ions and electrons, which will reduce the conductivity of the electrode and prevent It is conducive to the formation of high-capacity negative electrode materials; (3) metal Al has high chemical activity and reduction potential, and it is difficult to prepare Al nanostructures with regular morphology by chemical methods

Method used

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  • A kind of high-performance lithium-ion battery aluminum-based negative electrode material and preparation method thereof
  • A kind of high-performance lithium-ion battery aluminum-based negative electrode material and preparation method thereof
  • A kind of high-performance lithium-ion battery aluminum-based negative electrode material and preparation method thereof

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Effect test

Embodiment 1

[0053] Firstly, under the condition of stirring at 60° C., 0.05 g of carbon nanotubes were added into 40 ml of anhydrous trimethylbenzene to make them uniformly dispersed. Then add 0.052g of aluminum trichloride, 0.032g of aluminum acetylacetonate and 0.0575g of lithium aluminum hydride to the system in sequence, then raise the temperature to 140°C, and react under normal pressure for 4 hours to obtain carbon nanotubes and Al nanosheets The initial product of the compound. After the reaction was complete, the reaction vessel was taken out and cooled to room temperature. Then put the initial product into a centrifuge tube and centrifuge at a speed of 8000rpm for 5 minutes to obtain a gray-black solid substance. Then add 20ml of anhydrous acetone, ultrasonically wash to remove by-products such as lithium chloride, continue to centrifuge at 8000rpm for 5 minutes, repeat this washing process 3 times, and obtain a gray-black product, which is placed in a vacuum oven to dry at room...

Embodiment 2

[0056] First, under the condition of stirring at 60°C, 0.025g of carbon nanotubes was added into 40ml of anhydrous trimethylbenzene to make them uniformly dispersed. Then add 0.052g of aluminum trichloride, 0.032g of aluminum acetylacetonate and 0.0575g of lithium aluminum hydride to the system in sequence, then raise the temperature to 140°C, and react under normal pressure for 4 hours to obtain carbon nanotubes and Al nanosheets The initial product of the compound. After the reaction was complete, the reaction vessel was taken out and cooled to room temperature. Then put the initial product into a centrifuge tube and centrifuge at a speed of 8000rpm for 5 minutes to obtain a gray-black solid substance. Then add 20ml of anhydrous acetone, ultrasonically wash to remove by-products such as lithium chloride, continue to centrifuge at 8000rpm for 5 minutes, repeat this washing process 3 times, and obtain a gray-black product, which is placed in a vacuum oven to dry at room tempe...

Embodiment 3

[0059] Firstly, under the condition of stirring at 60° C., 0.1 g of carbon nanotubes were added into 40 ml of anhydrous trimethylbenzene to make them uniformly dispersed. Then add 0.052g of aluminum trichloride, 0.032g of aluminum acetylacetonate and 0.0575g of lithium aluminum hydride to the system in sequence, then raise the temperature to 140°C, and react under normal pressure for 4 hours to obtain carbon nanotubes and Al nanosheets The initial product of the compound. After the reaction was complete, the reaction vessel was taken out and cooled to room temperature. Then put the initial product into a centrifuge tube and centrifuge at a speed of 8000rpm for 5 minutes to obtain a gray-black solid substance. Then add 20ml of anhydrous acetone, ultrasonically wash to remove by-products such as lithium chloride, continue to centrifuge at 8000rpm for 5 minutes, repeat this washing process 3 times, and obtain a gray-black product, which is placed in a vacuum oven to dry at room ...

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Abstract

A high-performance lithium-ion battery aluminum-based negative electrode material and a preparation method thereof belong to the technical field of inorganic advanced materials. The three-dimensional long-range ordered structure composed of aluminum nanosheets and carbon nanotubes has less oxide layer, high packing density and exhibits excellent cycle stability and rate performance as the active material of lithium-ion battery anode. Preparation method: a. Preparation of reaction solution: First, carbon nanotubes are added to a two-necked flask filled with anhydrous trimethylbenzene, heated and stirred at 60° C., and then aluminum trichloride, aluminum acetylacetonate and Reductant lithium aluminum hydride; b. Reduction reaction: raise the reaction temperature to 120°C-165°C for 2-12 hours to obtain the crude product of the complex. The aluminum-based negative electrode material involved in the invention is low in cost, mild in preparation conditions, capable of large-scale production, and has good application prospects in lithium ion batteries.

Description

technical field [0001] The invention belongs to the technical field of inorganic advanced materials, and in particular relates to a high-performance lithium-ion battery aluminum-based negative electrode material and a preparation method thereof. Background technique [0002] As the most potential energy storage device of the new generation, lithium-ion batteries have the advantages of long cycle life, high energy density and power density, and have been widely used in electric vehicles, consumer electronics and renewable energy storage and other fields. For commercial lithium-ion batteries, cheap graphite carbon is generally used as the negative electrode material, but the theoretical capacity of graphite is low, only 372mAh g -1 , unable to meet the requirements of high-capacity lithium-ion batteries. Therefore, the development of high-capacity anode materials is crucial to meet the new generation of lithium-ion batteries. [0003] In recent years, some highly chemically ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/587H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/381H01M4/587H01M10/0525Y02E60/10
Inventor 罗亮孙雄孙晓明刘文
Owner BEIJING UNIV OF CHEM TECH
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