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A silicon-doped carbon porous composite film for lithium ion battery and preparation method thereof

A lithium-ion battery and composite film technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem of low reversible capacity, achieve high application value, reduce agglomeration, and low process cost

Active Publication Date: 2020-12-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The material shows good charge-discharge cycle stability, but the reversible capacity is low, only about 580mAh / g

Method used

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  • A silicon-doped carbon porous composite film for lithium ion battery and preparation method thereof
  • A silicon-doped carbon porous composite film for lithium ion battery and preparation method thereof
  • A silicon-doped carbon porous composite film for lithium ion battery and preparation method thereof

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Effect test

Embodiment 1

[0035] A silicon-doped carbon porous composite film for a lithium-ion battery is prepared through the following steps:

[0036](1) Weigh 3 parts by mass of 100nm elemental silicon and heat-treat it at 800°C for 10 minutes;

[0037] (2) Add the oxidized elemental silicon obtained in step (1) to 60 parts by mass of absolute ethanol, and after ultrasonic dispersion for 60 minutes, continue to add 10 parts by mass of deionized water and 0.8 parts by mass of γ-(2,3 -Glycidoxy)propyltrimethoxysilane, heated to 40°C, reacted for 4h, centrifuged and dried to obtain modified elemental silicon;

[0038] (3) Add 6 parts by mass of polystyrene to 25 parts by mass of dimethylsulfoxide, heat at 60°C for 0.5h, the mixed solution is in a clear and viscous state, continue to add 0.1 parts by mass of benzoic acid to the mixed solution, step ( 2) The obtained modified elemental silicon was reacted for 6 hours to make a uniform mixed solution, and a 100 μm film was coated on a glass plate with a...

Embodiment 2

[0044] A silicon-doped carbon porous composite film for a lithium-ion battery is prepared through the following steps:

[0045] (1) Weigh 25 parts by mass of 30nm elemental silicon and heat-treat it at 400°C for 1 min;

[0046] (2) Add the oxidized elemental silicon obtained in step (1) to 20 parts by mass of absolute ethanol, and after ultrasonic dispersion for 15 minutes, continue to add 3 parts by mass of deionized water and 0.1 part by mass of γ-mercaptopropyl trimethyl to the mixed solution Oxysilane, heated to 70°C, reacted for 8 hours, centrifuged and dried to obtain modified elemental silicon;

[0047] (3) Add 30 parts by mass of polyvinylpyrrolidone to 65 parts by mass of N,N-dimethylformamide, heat at 100°C for 3.5h, the mixed solution is clear and viscous, continue to add 25 parts by mass of p-benzene Diformic acid and the modified elemental silicon obtained in the above step (2) were reacted for 10 hours to make a uniform mixed solution, and a 100 μm film was coat...

Embodiment 3

[0051] A silicon-doped carbon porous composite film for a lithium-ion battery is prepared through the following steps:

[0052] (1) 14 parts by mass of 50nm elemental silicon were heat-treated at 600°C for 5 minutes;

[0053] (2) Add the oxidized elemental silicon obtained in step (1) to 40 parts by mass of absolute ethanol, and after ultrasonic dispersion for 37 minutes, continue to add 6.5 parts by mass of deionized water and 0.4 parts by mass of γ-aminopropyl tris Ethoxysilane, heated to 60°C, reacted for 6h, centrifuged and dried to obtain modified elemental silicon;

[0054] (3) Add 25 parts by mass of polyacrylonitrile to 45 parts by mass of N,N-dimethylacetamide, heat at 80°C for 2 hours, the mixed solution is in a clear and viscous state, continue to add 2.5 parts by mass of polyethylene glycol to the mixed solution 1. The modified elemental silicon obtained in the above step (2) was reacted for 8 hours to make a uniform mixed solution, and a film of 100 μm was coated...

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Abstract

The invention discloses a silicon-doped carbon porous composite film for a lithium-ion battery and a preparation method thereof. In the preparation method, elemental silicon is first oxidized, and the oxidized elemental silicon is modified by organosiloxane to obtain modified elemental silicon. Silicon-doped carbon composite film is prepared from a mixed solution made of organosiloxane-modified elemental silicon, carbon-based polymer, foaming pore-forming agent and organic solvent, and then hydrocarbons are used as carbon source and inert gas As a carrier gas, the silicon-doped carbon porous composite film is prepared by combining the method of depositing carbon nanomaterials on the silicon-doped carbon composite film by chemical vapor deposition and sublimating the foaming agent to form holes. When the present invention is used as a lithium-ion battery negative electrode material, its first lithium intercalation capacity is 1027.6mAh / g, its first delithiation capacity is 997mAh / g, and its Coulombic efficiency is 97.02%. After 100 cycles, its Coulombic efficiency is 91.31%, showing that Excellent charge and discharge performance.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a silicon-doped carbon porous composite thin film for negative electrode materials of lithium-ion batteries and a preparation method thereof. Background technique [0002] Lithium-ion batteries are ideal power sources for portable electronic devices and electric vehicles. The development of new materials with high energy density, long cycle life and high density is currently a hot spot in the research field of lithium-ion batteries. At present, the main commercial lithium-ion battery anode materials are mainly graphite anode materials, and its actual specific capacity is close to the theoretical value of 372mAh / g, and its lower theoretical capacity restricts the improvement of the energy density of lithium-ion batteries. It is imminent to develop anode materials with high specific capacity, excellent cycle stability and safety. [0003] Silicon material is currently the resear...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/133H01M4/134H01M4/1393H01M4/1395H01M4/36H01M4/38H01M4/485H01M4/587H01M4/62H01M10/0525B82Y30/00
CPCY02E60/10
Inventor 文秀芳颜子敏皮丕辉徐守萍程江
Owner SOUTH CHINA UNIV OF TECH
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