Nanometer composite negative material and preparation method and application thereof

A negative electrode material, nanocomposite technology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of low capacity and low cycle stability of silicon-based negative electrode materials, and can reach the synthesis scale. Amplification, high mechanical strength, good ion conductivity

Active Publication Date: 2019-08-02
SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] In view of the above deficiencies in the prior art, the purpose of the present invention is to provide a nanocomposite material and its preparation method and application, aiming to solve the problems of low capacity and low cycle stability of existing silicon-based negative electrode materials

Method used

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  • Nanometer composite negative material and preparation method and application thereof
  • Nanometer composite negative material and preparation method and application thereof
  • Nanometer composite negative material and preparation method and application thereof

Examples

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Embodiment 1

[0062] A method for preparing a silicon-carbon negative electrode material and testing thereof, comprising the following steps:

[0063] The first step, asphaltene adsorption: add 50mg of silicon powder with a diameter of 100nm to 100ml of 1.0g / L toluene solution of asphaltene molecules, and mechanically stir for 12 hours to drive the asphaltene molecules to the surface of the core material.

[0064] The second step, drying: remove the supernatant after centrifugation at 8000rpm / min, and dry the remaining silica mud in the tube for 12 hours in a vacuum oven at 50°C to remove the solvent.

[0065] The third step, high-temperature treatment: put the asphaltene-coated silicon powder in a heated quartz tube, and under the protection of an inert gas, first raise the temperature at 5°C per minute to 100°C, keep it warm for 10 minutes, and then heat it at 5°C / min The heating rate was raised to 800° C., kept for 1 h, and cooled to room temperature to obtain the asphaltene adsorption l...

Embodiment 2

[0069] A method for preparing a silicon-carbon negative electrode material and testing thereof, comprising the following steps:

[0070] The first step, solvent transition method: add 50mg of silicon powder with an average diameter of 100nm to the toluene solution of 1.0g / l asphaltene molecules, and slowly drop a certain amount of methanol solution, so that the final volume ratio of toluene and methanol is 8:2 , stirred for 12 hours, driving the first layer of asphaltene molecules to the surface of the core material. After 12 hours, slowly drop a certain amount of heptane, so that the final volume ratio of the mixed solution of heptane, toluene and methanol is 8:2, and drive the second layer of asphaltene molecules to the surface of the first layer of asphaltene molecules.

[0071] The second step, drying: remove the supernatant after centrifugation at 8000rpm / min, and dry the remaining silica mud in the tube for 12 hours in a vacuum oven at 50°C to remove the solvent.

[007...

Embodiment 3

[0076] A method for preparing a silicon-carbon negative electrode material and testing thereof, comprising the following steps:

[0077] The first step, asphaltene adsorption: add 50mg of silicon powder with a diameter of 100nm to 100ml of 1.0g / L toluene solution of asphaltene molecules, and stir for 12 hours to drive the asphaltene molecules to the surface of the core material.

[0078] The second step, drying: remove the supernatant after centrifugation at 8000rpm / min, and dry the remaining silica mud in the tube for 12 hours in a vacuum oven at 50°C to remove the solvent.

[0079] The third step, high-temperature treatment: put the asphaltene-coated silicon powder in a heated quartz tube, and under the protection of an inert gas, first raise the temperature at 5°C per minute to 100°C, keep it warm for 10 minutes, and then heat it at 5°C / min The heating rate was raised to 600° C., kept for 1 h, and cooled to room temperature to obtain a high-temperature treated asphaltene ad...

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Abstract

The invention discloses a nanometer composite negative material and a preparation method and application thereof. The method comprises the steps that nanometer particles with lithium ion embedding activity are mixed with asphaltene in a solvent, the characteristic of the solvent is selected and controlled so that the asphaltene are absorbed in the surfaces of the nanometer particles and a coatingis formed, and a precursor of the composite material is obtained; and the precursor of the composite material is heated in the inert atmosphere, and the nanometer composite negative material is prepared. The preparation method has the advantages including wide raw material resources, simple synthesis path and capable of widening the synthesis scale. The composite negative material comprise the coating formed by the asphaltene absorbed in the surfaces of the nanometer particles, the coating has the advantages of high mechanical strength and high ion conductivity after high temperature treatment, and the nanometer composite negative material has performances, as high energy density and high circulation stability, needed by high-efficiency lithium battery anodes.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a nanocomposite negative electrode material and its preparation method and application. Background technique [0002] With the stringent carbon emission standards year by year around the world, the popularity of new energy vehicles is an irreversible trend. New energy vehicles have increasingly demanding performance indicators such as battery life, charge and discharge rate, battery life, and safety. However, the performance of current lithium-ion batteries is far from meeting future needs. In the future, negative electrode materials for lithium-ion batteries need to have faster electron transport performance, larger lithium-ion storage capacity, more efficient lithium-ion diffusion rate, and better charge-discharge cycle stability. New materials with such properties are crucial for the development and widespread application of next-generation batteries. [0003] At present, mainstream...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/62H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/366H01M4/386H01M4/387H01M4/483H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 徐政和杨帆易婷婷
Owner SOUTH UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA
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