A nano silicon-carbon composite material and a preparation method and application thereof

A technology of carbon composite materials and nano-silicon, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problems of difficult formation of stable SEI film, impact on battery performance, additive consumption, etc., to achieve Effects of improving electrochemical performance, improving electrical conductivity, improving conductivity and buffering performance

Active Publication Date: 2019-01-08
ZHEJIANG UNIV
View PDF3 Cites 18 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Although the above research directions can improve the cycle life of silicon-based anodes, it is still a huge challenge to realize the simple and large-scale preparation of silicon-based materials.
In addition, unlike graphite negative electrodes, HF in the electrolyte has a corrosive effect on

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
  • A nano silicon-carbon composite material and a preparation method and application thereof
  • A nano silicon-carbon composite material and a preparation method and application thereof
  • A nano silicon-carbon composite material and a preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0056] Example 1

[0057] The commercial crude silicon was ball milled at a speed of 480r / min for 10 hours, washed with 0.1 mol / L hydrochloric acid, and then heat-treated at 600°C for 3 hours under an argon atmosphere to initially crush and purify the crude silicon; The crude silicon and magnesium powder are mixed uniformly according to the molar ratio of silicon to magnesium of 1:2.04, and heat-treated in an argon atmosphere at 650°C for 5 hours to obtain a magnesium silicide alloy; the magnesium silicide alloy obtained above is placed in a magnetic boat, and polypropylene is placed In another magnetic boat, where the weight ratio of polypropylene and magnesium silicide is 0.5:1, the two magnetic boats are placed in a tube furnace, heated to 800°C in an argon atmosphere, and then heat treated in an argon atmosphere at 800°C After 20 hours, naturally cool to room temperature to obtain a silicon carbon nanocomposite material; mix the nano silicon carbon composite material obtained...

Example Embodiment

[0078] Example 2

[0079] The commercial crude silicon was ball milled at a speed of 480r / min for 10 hours, washed with 0.1 mol / L hydrochloric acid, and then heat-treated at 600°C for 3 hours under an argon atmosphere to initially crush and purify the crude silicon; The crude silicon and magnesium powder are mixed uniformly according to the molar ratio of silicon to magnesium of 1:2.06, and are heat-treated in an argon atmosphere at 550°C for 15 hours to obtain a magnesium-silicon alloy; the magnesium silicide alloy obtained above is placed in a magnetic boat, and polyethylene is placed In another magnetic boat, where the weight ratio of polyethylene and magnesium silicide is 1:1, the two magnetic boats are placed in a tube furnace, heated to 750°C in an argon atmosphere, and then heat treated in an argon atmosphere at 750°C After 30 hours, naturally cool to room temperature to obtain silicon carbon nanocomposite material; mix the nano silicon carbon composite material obtained a...

Example Embodiment

[0083] Example 3

[0084] The commercial crude silicon was ball milled at a speed of 480r / min for 10 hours, washed with 0.1 mol / L hydrochloric acid, and then heat-treated at 600°C for 3 hours under an argon atmosphere to initially crush and purify the crude silicon; The crude silicon and magnesium powder are mixed uniformly according to the molar ratio of silicon to magnesium of 1:2.02, and heat-treated in an argon atmosphere at 600°C for 10 hours to obtain a magnesium-silicon alloy; the magnesium silicide alloy obtained above is placed in a magnetic boat, and the polyethylene is placed In another magnetic boat, where the weight ratio of polyvinyl chloride and magnesium silicide is 2:1, the two magnetic boats are placed in a tube furnace, heated to 850°C in an argon atmosphere, and then in an argon atmosphere at 850°C Heat treatment for 15 hours and naturally cool to room temperature to obtain a silicon carbon nanocomposite material; mix the nano silicon carbon composite material...

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
Thicknessaaaaaaaaaa
Thicknessaaaaaaaaaa
Login to view more

Abstract

The invention discloses a nanometer silicon-carbon composite material and a preparation process thereof, and an application of the nanometer silicon-carbon composite material as a negative electrode material in a lithium ion battery. The nano-silicon-carbon composite material has a multi-stage structure, wherein the nano-silicon particles are taken as a core, the amorphous carbon is taken as an intermediate cladding layer, and the carbon fluoride is taken as a shell. The above preparation proces, Nano-silicon was prepared by simple alloying and de-alloying of low-cost crude silicon and magnesium powder. In the process of de-alloying, magnesium silicide and polymer pyrolysis were used simultaneously, and nano-silicon-carbon and carbon fluoride were combined by physical ball milling to prepare nano-silicon-carbon composite. The SiC nanocomposites prepared by the above method have high capacity, high first Coulomb efficiency and excellent cycle performance. The method has the advantages of simple process, low energy consumption, and is favorable for industrial production.

Description

technical field [0001] The invention relates to the technical field of energy storage batteries, in particular to a nano-silicon-carbon composite material and its preparation method and application. Background technique [0002] In recent years, the rapid development of new energy power generation has put forward new requirements for matching energy storage systems. In the replacement of energy storage batteries, lithium-ion batteries have become the focus due to their various advantages. It has been applied in a large number of energy storage projects and achieved certain results. [0003] The capacity of a lithium-ion battery depends on the active lithium ions of the positive electrode material and the ability of the negative electrode material to intercalate and remove lithium. The stability of the positive and negative electrodes in various environments affects the performance of the battery and even seriously affects the safety of the battery. , The performance of the ...

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): H01M4/36H01M4/38H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/386H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 谢健张诗韵郭丽芬曹高劭赵新兵
Owner ZHEJIANG UNIV
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