Unlock instant, AI-driven research and patent intelligence for your innovation.

Silicon negative pole material, preparation method and application

A technology of silicon negative electrode and negative electrode, applied in the direction of negative electrode, battery electrode, active material electrode, etc., can solve the problems of capacity decay of active material, poor discharge performance at high current, poor conductivity, etc., to achieve good rate performance, good performance, improve Effects of Cycle and Override Capability

Inactive Publication Date: 2019-11-19
SHANDONG UNIV
View PDF3 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are two main problems with silicon anode materials. One is the huge volume effect (~400%) in the process of charging and discharging, which leads to the pulverization and cracking of the active material and the shedding of the current collector, which leads to a sharp decline in capacity; the other is the intrinsic Low conductivity (6.7×10 -4 S cm -1 ), resulting in poor electrical conductivity of the material resulting in poor high-current discharge performance

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
  • Silicon negative pole material, preparation method and application
  • Silicon negative pole material, preparation method and application
  • Silicon negative pole material, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Take 2.9099g of pyrrole monomer and dissolve it in 450mL of deionized water, stir magnetically for 50 minutes and mix well. Then configure 150mL of 0.3mol / L FeCl 3 The aqueous solution was slowly poured into the above pyrrole solution, and magnetically stirred in an ice-water bath at 0°C. After reacting for 6 h, the product was subjected to suction filtration, and washed with absolute ethanol and deionized water respectively until the filtrate was colorless. Finally, put the product in a vacuum oven at 120° C. overnight, and the obtained black powder is polypyrrole. The obtained polypyrrole and commercial graphite were ball milled for 2 hours at a mass ratio of 1:1 to obtain a polypyrrole / graphite composite material. The obtained polypyrrole / graphite composite material and silicon powder with a particle size of 3 μm were mechanically ball milled for 1 h at a mass ratio of 2:1 to obtain a modified lithium-ion battery silicon-based negative electrode material, such as ...

Embodiment 2

[0053] Take 2.9099g of pyrrole monomer and dissolve in 450ml of deionized water, stir magnetically for 50 minutes and mix well. Then configure 150ml of 0.3mol / L FeCl 3 The aqueous solution was slowly poured into the above pyrrole solution, and magnetically stirred in an ice-water bath at 0°C. After reacting for 6 h, the product was subjected to suction filtration, and washed with absolute ethanol and deionized water respectively until the filtrate was colorless. Finally, put the product in a vacuum oven at 120° C. overnight, and the obtained black powder is polypyrrole. The obtained polypyrrole and commercial graphite were ball milled for 2 hours at a mass ratio of 1:1 to obtain a polypyrrole / graphite composite material. The obtained polypyrrole / graphite composite material and silicon powder with a particle size of 3 μm were mechanically ball-milled for 1 h at a mass ratio of 1:1 to obtain a modified silicon-based negative electrode material for lithium-ion batteries.

[00...

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 diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
Login to View More

Abstract

The invention provides a silicon negative electrode material, a preparation method and application. The preparation method comprises the following steps that: first ball milling treatment is carried out on polypyrrole and graphite so as to obtain a polypyrrole / graphite composite material; and silicon is added into the polypyrrole / graphite composite material, and second ball milling treatment is carried out, so that the silicon negative electrode material can be obtained. The silicon negative electrode material prepared by the method disclosed by the invention has relatively high cycle and rateperformance, and can show very good electrochemical performance.

Description

technical field [0001] The present disclosure relates to the field of lithium-ion batteries, relates to lithium-ion battery negative poles, and specifically relates to a silicon negative pole material and its preparation method and application. Background technique [0002] The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] With the development of information technology and low-carbon economy, people's demand for sustainable and clean energy is getting higher and higher. Today, however, mainly non-renewable fossil fuels with limited reserves, such as coal, oil and natural gas, are used. On the one hand, the excessive exploitation and use of fossil energy has caused serious environmental pollution, and on the other hand, the energy crisis has continued to aggravate. Therefore, it is imminent to change the way of energy utilization and develop renewable energy. Renewable energy...

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
Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/0525
CPCH01M4/362H01M4/386H01M4/624H01M4/625H01M10/0525H01M2004/021H01M2004/027Y02E60/10
Inventor 张建新赵士猛杜逸群徐程张文扬
Owner SHANDONG UNIV