Si (at) void (at) C embedded three-dimensional porous carbon network negative electrode material and preparation and application thereof

A negative electrode material, three-dimensional porous technology, applied in the direction of negative electrode, battery electrode, active material electrode, etc., can solve the problem of destroying the buffer layer

Active Publication Date: 2021-05-18
QILU UNIV OF TECH
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method still uses reagents to dissolve the SiO buffer layer, and the reagents will still destroy the buffer layer

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
  • Si (at) void (at) C embedded three-dimensional porous carbon network negative electrode material and preparation and application thereof
  • Si (at) void (at) C embedded three-dimensional porous carbon network negative electrode material and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The preparation of Si@void@C / C-1 includes the following steps:

[0032] (1) ultrasonically disperse 60 mg of silicon powder in 12 ml of deionized aqueous solution to obtain silicon powder wrapped in a hydration film;

[0033] (2) Take 0.06ml Tween 80, 0.12ml Span 85 and 40ml styrene monomer as the oil phase, weigh 1.0ml silane coupling agent and 0.045g diphenylphosphine oxide photosensitizer into 40ml oil phase in turn, and stir to obtain Oil phase mixed solution;

[0034] (3) Mix the silicon powder wrapped by the hydration film with the oil phase solution, emulsify and stir for 2 hours, irradiate with ultraviolet light for 1 hour, then vacuum freeze-dry, then send it to Ar gas environment for heat treatment at 850°C for 3 hours, and finally undergo hydrothermal treatment at 160°C 18h to obtain gray-black product.

Embodiment 2

[0036] Preparation of Si@void@C / C-2

[0037] Include the following steps:

[0038] (1) ultrasonically disperse 60 mg of silicon powder in 12 ml of deionized aqueous solution to obtain silicon powder wrapped in a hydration film;

[0039] (2) Take 0.06ml Tween 80, 0.12ml Span 85 and 40ml styrene monomer as the oil phase, weigh 1.0ml silane coupling agent and 0.045g diphenylphosphine oxide photosensitizer into 40ml oil phase in turn, and stir to obtain Oil phase mixed solution;

[0040] (3) Mix the silicon powder wrapped by the hydration film with the oil phase solution, emulsify and stir for 2 hours, irradiate with ultraviolet light for 2 hours, then vacuum freeze-dry, then send it to Ar gas environment for heat treatment at 850°C for 3 hours, and finally undergo hydrothermal treatment at 160°C 18h to obtain gray-black product.

Embodiment 3

[0042] Preparation of Si@void@C / C-3

[0043] Include the following steps:

[0044] (1) ultrasonically disperse 60 mg of silicon powder in 12 ml of deionized aqueous solution to obtain silicon powder wrapped in a hydration film;

[0045] (2) Take 0.06ml Tween 80, 0.12ml Span 85 and 40ml styrene monomer as the oil phase, weigh 1.0ml silane coupling agent and 0.045g diphenylphosphine oxide photosensitizer into 40ml oil phase in turn, and stir to obtain Oil phase mixed solution;

[0046] (3) Mix the silicon powder wrapped by the hydration film with the oil phase solution, emulsify and stir for 2 hours, irradiate with ultraviolet light for 3 hours, then vacuum freeze-dry, then send it to Ar gas environment for heat treatment at 850°C for 3 hours, and finally undergo hydrothermal treatment at 160°C 18h to obtain gray-black product.

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
Particle sizeaaaaaaaaaa
Discharge capacityaaaaaaaaaa
Login to view more

Abstract

The invention discloses a Si (at) void (at) C embedded three-dimensional porous carbon network negative electrode material and preparation and application thereof. According to the invention, commercialized nano silicon particles are used as a research system, and the composite material with the core-shell structure Si (at) void (at) C embedded into the three-dimensional porous carbon network is controlled and synthesized by adopting a mode of combining photosensitized polymerized styrene silicon nano ion emulsion, high-temperature calcination heat treatment and hydrothermal treatment. The styrene is polymerized through ultraviolet irradiation to form polystyrene, the carbon source is formed through high-temperature pyrolysis, the synthesis process is simple and green, and the price of the styrene monomer is low. According to the invention, the introduction of a complicated template involved in the research work of the conventional core-shell structure Si (at) void (at) C and the damage of corrosive HF to the environment are avoided, the cyclic specific capacity and stability of the Si nano-powder are effectively improved, the material cost is reduced, and commercialized large-scale production is expected to be realized.

Description

technical field [0001] The invention relates to the technical field of lithium battery negative electrode materials, in particular to Si@void@C embedded three-dimensional porous carbon mesh negative electrode material and its preparation and application. Background technique [0002] At present, lithium-ion batteries have achieved rapid development in the power supply of electric vehicles, showing broad development prospects. However, the current mileage of lithium-ion batteries is short, which requires researchers to further improve the energy density and cycle stability of electrode materials, and promote the commercial application of high-capacity electrode materials in the field of electric vehicles. The negative electrode of lithium ion battery is mainly composed of natural or artificial graphite, mesophase carbon microspheres and lithium titanate. However, the capacity of commonly used negative electrode materials is generally low. The theoretical capacity of lithium ...

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): H01M4/38H01M4/62H01M10/0525
CPCH01M4/386H01M4/625H01M4/628H01M10/0525H01M2004/027Y02E60/10
Inventor 马景云倪浩杰
Owner QILU 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