High-performance lithium ion battery aluminum-based negative electrode material and preparation method thereof

A technology of aluminum trichloride and aluminum acetylacetonate, applied in battery electrodes, secondary batteries, nanotechnology for materials and surface science, etc. Stability deterioration and other issues, to achieve excellent cycle stability, improve conductivity, and good mechanical properties

Active Publication Date: 2018-09-18
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • High-performance lithium ion battery aluminum-based negative electrode material and preparation method thereof
  • High-performance lithium ion battery aluminum-based negative electrode material and preparation method thereof
  • High-performance lithium ion battery aluminum-based negative electrode material and preparation method thereof

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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

The invention discloses a high-performance lithium ion battery aluminum-based negative electrode material and a preparation method thereof, and belongs to the technical field of inorganic advanced materials. The aluminum-based negative electrode material is a three-dimensional long-range ordered structure formed by compounding aluminum nanosheets and carbon nanotubes, has less oxide layer and a high bulk density, and has excellent cycle stability and excellent rate performances as an active substance for a lithium ion battery negative electrode. The preparation method comprises the following steps: a, preparing a reaction solution: adding the carbon nanotubes to a two-necked flask containing anhydrous trimethylbenzene, performing heating and stirring at 60 DEG C, and sequentially adding aluminum trichloride, aluminum acetylacetonate and a reducing agent lithium aluminum hydride to the above system; and b, performing a reduction reaction: raising the reaction temperature to 120-165 DEGC, and performing the reaction for 2-12 h to obtain a crude product of the above compound. The aluminum-based negative electrode material has the advantages of low cost, mild preparation conditions, large scale production, and good application prospect in the field of 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 Applications(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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