Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Preparation method of carbon composite silicon anode material of lithium ion battery

A lithium-ion battery and negative electrode material technology, applied in the field of materials, can solve problems such as poor safety, high cost, and low efficiency, and achieve the effects of buffering volume expansion, enhancing conductivity, and reducing costs

Active Publication Date: 2019-11-19
孙旭阳
View PDF12 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above materials can have high first effect and good long-term cycle stability at the same time, but the preparation process is difficult and the cost is very high
For example, in current scientific research, magnesia thermal reduction is often used to prepare oxygenated silicon oxide. This method is less safe when Mg powder is mixed with Mg silicon oxide. Strict explosion-proof measures are required, and Mg is easy to be produced. 2 SiO 4 Impurities, high cost and low efficiency; in addition, methods such as preparing SiO and SiOx by ball milling silicon powder and nano-silicon dioxide, and then forming composite materials through pyrolysis coating of organic carbon sources have disadvantages such as poor quality and high cost.

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 carbon composite silicon anode material of lithium ion battery
  • Preparation method of carbon composite silicon anode material of lithium ion battery
  • Preparation method of carbon composite silicon anode material of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Put 50 grams of fumed silica (attached figure 1 , it can be seen that fumed silica is the aggregate of nano-silica, the average particle size of nano-silica is 20-30nm) is placed at the bottom of the container, and then 500 grams of NaCl and 100 grams of organic carbon source glucose are evenly mixed and loaded , heated to above 900°C to form a high-temperature molten salt mixture; glucose is cracked into atomic carbon in the molten salt, the atomic carbon dissolves and diffuses, and reduces the white carbon black floating in the melt; part of the white carbon black is reduced to form silicon, and part of the white carbon black Carbon black is reduced to oxygen-changed silicon oxide, some carbon atoms are supersaturated and precipitated to form carbon black and graphene, and part of the silicon dioxide is not reduced, gradually forming micro-nano carbon and silicon-oxygen-changed silicon oxide-silicon oxide (micro-nono-Si / SiOx / SiO 2 @C) compound; the compound increases...

Embodiment 2

[0032] A square flat-bottomed container is placed in the vacuum chamber, and the tank is filled with Bi / In alloy (Bi:In=21.5:78.5, at; at this time, the melting point of the alloy is only 72°C), and the alloy is heated to 1200°C to form a melt; adopt vertical transmission The screw transports the silica separated by the partition to the bottom of the container and spreads the silica at the bottom by using a horizontal conveying screw; the carbon source pressurized methane is passed into the alloy melt through a circular tube, and the carbon source and silica are metered Ratio 4:1 (wt). At this high temperature, methane cracks into atomic carbon, atomic carbon dissolves and reduces the floating silica in the melt; part of silica is reduced to silicon, part of silica is reduced to oxygen-changed silicon oxide, and part of atomic Carbon is supersaturated and precipitated to form carbon black and graphene, and part of the silicon dioxide is not reduced; thereby obtaining micro-nan...

Embodiment 3

[0034] A nickel cylindrical container is filled with NaCl / KCl mixed salt (NaCl:KCl=1:1, wt;), and heated to above 700°C to form a molten salt; the quartz sand and the organic carbon source bisphenol A are evenly mixed and stacked on the The surface of the molten salt, and use the vertical conveying screw to transport the quartz sand and bisphenol A to the middle and lower part of the container while stirring to make them evenly dispersed in the melt; due to the catalytic effect of Ni, bisphenol A is completely cracked at this temperature, cracked into Atomic carbon and atomic carbon dissolve and reduce the sinking quartz sand in the melt; part of the quartz sand is reduced to form silicon, part of the quartz sand is reduced to oxygen-variable silicon oxide, and part of the atomic carbon is supersaturated and precipitated to form carbon black and graphene , part of the quartz sand has not been reduced; thereby obtaining micro-nano carbon and silicon-oxygenated silicon oxide-sili...

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
Solubilityaaaaaaaaaa
Melting pointaaaaaaaaaa
Melting pointaaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation method of a carbon composite silicon anode material of a lithium ion battery. The preparation method is technically characterized by comprising the following steps of: containing a high-temperature melt in a container; conveying the silicon dioxide micro-powder to the middle lower part of the container; continuously adding an organic carbon source into the container; performing stirring to enable the silicon dioxide micro-powder to be distributed in the high-temperature melt; cracking the organic carbon source into atomic carbon at a high temperature and diffusing the organic carbon source in the high-temperature melt; reacting the atomic carbon with silicon dioxide; obtaining a micro-nano carbon and silicon-variable oxygen type silicon monoxide-silicon oxide (micro-nono-Si / SiOx / SiO2(@)C) compound; and separating the melt or the cooling crystal substance of the melt from the micro-nono-Si / SiOx / SiO2(@)C compound, performing cleaning, purifying and the like to obtain the finished product of the carbon composite silicon anode material of the lithium ion battery. The prepared material is excellent in performance and quality, low in production cost,high in efficiency and less in pollution.

Description

technical field [0001] The invention relates to the field of materials, in particular to a method for preparing a carbon-composite silicon-based negative electrode material for a lithium-ion battery. Background technique [0002] Graphite anode materials for lithium-ion batteries have become the first choice for commercial lithium-ion batteries due to their relatively stable properties in the electrolyte, good electronic conductivity and low price, but their theoretical specific capacity is low (370mAh / g) Problems such as poor high-rate discharge performance, and its lithium-deintercalation potential is similar to that of lithium, and it is easy to precipitate lithium to form dendrites and cause a short circuit, which brings great safety hazards, and it is difficult to meet the requirements of electric vehicles and hybrid electric vehicles. Performance, large-scale lithium-ion battery requirements. [0003] Silicon anode is considered to be an ideal choice for next-generat...

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): H01M4/36H01M4/38H01M4/48H01M4/62H01M10/0525B82Y30/00
CPCH01M4/366H01M4/386H01M4/483H01M4/625H01M10/0525B82Y30/00Y02E60/10
Inventor 孙旭阳
Owner 孙旭阳
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com