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

A kind of preparation method of graphene-si-o-c composite negative electrode material

A negative electrode material, -si-o-c technology, applied in the direction of battery electrodes, structural parts, electrical components, etc., can solve the problems of difficult formation and low coulombic efficiency of graphene negative electrode materials, so as to prevent interlayer stacking and improve electrochemical performance. Excellent performance and dispersibility

Active Publication Date: 2022-02-01
WUHAN UNIV
View PDF12 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reason for the low Coulombic efficiency of graphene negative electrode material is that it is difficult to form a stable SEI film on its surface.

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 kind of preparation method of graphene-si-o-c composite negative electrode material
  • A kind of preparation method of graphene-si-o-c composite negative electrode material
  • A kind of preparation method of graphene-si-o-c composite negative electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Provide a kind of preparation method of graphene-Si-O-C composite negative electrode material (GE / Si-O-C), comprise the following steps:

[0031] 1) Preparation of silane-modified polyester (Si-PET)

[0032]A certain amount of phthalic anhydride, pentaerythiol (by molar ratio 1:1.1), organotitanium catalyst (5% of the total mass of phthalic anhydride and pentaerythiol) was added to the water separator, The three-necked flask with the condenser and the thermometer was heated in a constant temperature magnetic stirring oil bath. When the temperature rises to about 180°C and water distills out, control the reaction temperature to make the reaction run smoothly; control the temperature of the flask at 180-200°C and keep it for 5 hours; then lower the temperature to about 170°C and react for 2 hours to complete the esterification reaction; lower the temperature to 60°C At ℃, drop tetramethoxysilane (100% of the total mass of phthalic anhydride and pentaerythiol) in the ther...

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
current efficiencyaaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation method of a graphene-Si-O-C composite negative electrode material. The steps are: 1) adding graphene oxide to silane-modified polyester, adding ascorbic acid after ultrasonic dispersion to obtain graphene oxide / organosilicon-modified polyester; 2) modifying the graphene oxide / organosilicon modified polyester obtained in step 1) The polyester is vulcanized at room temperature, heated to reduce graphene oxide, and then carbonized in an inert gas atmosphere to obtain a graphene-Si-O-C composite negative electrode material. The method is simple to operate, the production process is convenient and feasible, and the cost of raw materials is low. The graphene and silicon oxygen carbon can be evenly distributed in the obtained composite negative electrode material. As the negative electrode material, the electrochemical performance is excellent, and it has broad industrial production prospects.

Description

technical field [0001] The invention belongs to the technical field of negative electrode material preparation technology, and in particular relates to a preparation method of graphene-Si-O-C composite negative electrode material. Background technique [0002] Lithium battery has become a commonly used energy storage device because of its high current density, low charge and discharge voltage, and easy-to-obtain positive and negative electrode materials. The commonly used positive electrode material is lithium cobaltate, and the negative electrode material is carbon, mainly graphite carbon. As current power batteries put forward higher and higher requirements for current density, commonly used carbon anode materials face a theoretical ceiling and cannot break through. Silicon-based materials are used as the negative electrode of lithium batteries and have the highest theoretical capacity. Li and Si form an alloy LixSi (0<x≤4.4); the lithium-rich product is mainly Li 3....

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 Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/583H01M4/62H01M10/0525
CPCH01M4/362H01M4/483H01M4/583H01M4/62H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 黄荣华王莉别萱董亚巍王奔
Owner WUHAN UNIV