Preparation method of silicon-titanium dioxide-graphene flexible self-supporting electrode

A self-supporting electrode, titanium dioxide technology, used in battery electrodes, secondary batteries, circuits, etc., can solve the problem of difficult to obtain uniform and stable composite electrodes, and achieve the effect of reducing the quality of the pole piece, improving the mechanical properties, and improving the conductivity.

Pending Publication Date: 2022-07-08
NANJING UNIV OF TECH
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For self-supporting electrode materials, it is difficult to obtain a uniform and stable composite electrode due to the influence of dis

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of silicon-titanium dioxide-graphene flexible self-supporting electrode
  • Preparation method of silicon-titanium dioxide-graphene flexible self-supporting electrode
  • Preparation method of silicon-titanium dioxide-graphene flexible self-supporting electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033]1) ultrasonically treat the graphite oxide filter cake with an average size of 150 μm in water, the ultrasonic frequency is 50 kHz, and the time is 1 h to prepare a graphene oxide dispersion liquid of 5 mg / mL; meanwhile, the concentrated sulfuric acid and hydrogen peroxide are 2.33 by volume ratio. Proportional mixing, adding nano-silicon particles into the mixture, the concentration of silicon nanoparticles in the mixed solution is 12.5 mg / mL, heating to 80° C. for magnetic stirring for 2 hours, centrifugal washing with water and vacuum drying to obtain modified silicon. The modified nano-silicon particles were dispersed in anhydrous ethanol, the concentration of silicon was 0.8 mg / mL, ultrasonic stirring was carried out for 1 h, a small amount of ammonia water was added dropwise, which was 0.4% of the volume of ethanol, and a certain amount of tetrafluoroethylene was added dropwise to it. Titanium isopropoxide, wherein the mass fraction of silicon nanoparticles relative...

Embodiment 2

[0038] 1) ultrasonically treat the graphite oxide filter cake with an average size of 150 μm in water, the ultrasonic frequency is 50 kHz, and the time is 1 h to prepare a graphene oxide dispersion liquid of 3 mg / mL; meanwhile, the concentrated sulfuric acid and hydrogen peroxide are 2.33 by volume ratio. Proportional mixing, adding nano-silicon particles into the mixture, the concentration of silicon nanoparticles in the mixed solution is 12.5 mg / mL, heating to 80° C. for magnetic stirring for 2 hours, centrifugal washing with water and vacuum drying to obtain modified silicon. Disperse the modified nano-silicon particles in ethanol, the concentration of silicon is 0.8mg / mL, ultrasonically stir for 1h, add a small amount of ammonia water, which is 0.4% of the volume of ethanol, and then add a certain amount of tetraisopropyl. Titanium alkoxide, wherein the mass fraction of silicon nanoparticles relative to titanium tetraisopropoxide is 200 mg / mL. The silicon-titanium dioxide ...

Embodiment 3

[0047] 1) ultrasonically treat the graphite oxide filter cake with an average size of 150 μm in water, the ultrasonic frequency is 50 kHz, and the time is 1 h to prepare a graphene oxide dispersion liquid of 3 mg / mL; meanwhile, the concentrated sulfuric acid and hydrogen peroxide are 2.33 by volume ratio. Proportional mixing, adding nano-silicon particles into the mixture, the concentration of silicon nanoparticles in the mixed solution is 12.5 mg / mL, heating to 80° C. for magnetic stirring for 2 hours, centrifugal washing with water and vacuum drying to obtain modified silicon. Disperse the modified nano-silicon particles in ethanol, the concentration of silicon is 0.8mg / mL, ultrasonically stir for 1h, add a small amount of ammonia water, which is 0.4% of the volume of ethanol, and then add a certain amount of tetraisopropyl. Titanium alkoxide, wherein the mass fraction of silicon nanoparticles relative to titanium tetraisopropoxide is 150 mg / mL. The silicon-titanium dioxide ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Thicknessaaaaaaaaaa
Quality scoreaaaaaaaaaa
Login to view more

Abstract

The invention discloses a preparation method of a silicon-titanium dioxide-graphene flexible self-supporting electrode, which comprises the following steps: by taking large-size graphene oxide, titanium tetraisopropylate and nano silicon powder as raw materials, firstly coating a layer of titanium dioxide on the surface of silicon particles by a simple sol-gel method, dispersing silicon-titanium dioxide in graphene oxide dispersion liquid, and preparing a silicon-titanium dioxide-graphene flexible self-supporting electrode; performing ultrasonic treatment to form uniform dispersion liquid; the preparation method comprises the following steps: adding graphene into a chitosan coagulating bath, carrying out vacuum suction filtration, collecting a filter cake, flattening the filter cake, carrying out liquid nitrogen freezing, carrying out freeze drying, carrying out physical pressurization, and carrying out high-temperature treatment in a mixed atmosphere of argon and ammonia gas to obtain the silicon-titanium dioxide-graphene flexible self-supporting electrode. Titanium dioxide and graphene provide dual protection for silicon, titanium dioxide is tightly adhered to the surface of silicon, expansion of silicon is effectively limited, graphene is arranged on the outer layer, the overall conductivity of the material is improved, and the overall mechanical performance is improved while protection is achieved.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a preparation method of a silicon-titanium dioxide-graphene flexible self-supporting electrode. Background technique [0002] In recent years, the development of flexible and lightweight electrodes for Li-ion batteries has been recognized as a powerful technology for next-generation electronic devices such as wearable devices and smart electronic devices. The preparation of flexible self-supporting electrodes without binders and conductive agents can not only improve the mass capacity of practical electrodes for lithium-ion batteries, but also enable them to have more applications. [0003] Silicon-based anode materials have a theoretical capacity of 4200mAh / g and are rich in material resources. They are expected to replace graphite electrodes and become the next generation of commercial anode materials. The biggest factor limiting the development of silicon-based anodes is th...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H01M4/1391H01M4/1393H01M4/1395H01M4/36H01M4/38H01M4/48H01M4/583H01M10/0525
CPCH01M4/1391H01M4/1393H01M4/1395H01M4/366H01M4/386H01M4/483H01M4/583H01M10/0525H01M2004/027Y02E60/10
Inventor 暴宁钟苏朋吴健刘孝伟柯克管图祥张洪涛张绍辉徐学良黄思淼
Owner NANJING UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap