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

Method for coating artificial graphitic carbon anode material surface

A carbon anode material, artificial graphite technology, applied in the direction of graphite, battery electrodes, electrical components, etc., can solve the problems of large environmental pollution, difficult to meet performance requirements, high production costs, and achieve the effect of excellent cycle performance

Active Publication Date: 2013-05-01
CHINA NAT OFFSHORE OIL CORP +1
View PDF4 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The solvent coating method can evenly coat a layer of carbon material on the surface of artificial graphite, which can significantly improve the electrochemical performance of artificial graphite materials. However, due to the use of organic solvents in the coating process, it causes great environmental pollution and high production costs.
The production process of the solid phase coating method is relatively simple, but the coating uniformity is poor, and it is difficult to meet the performance requirements

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
  • Method for coating artificial graphitic carbon anode material surface
  • Method for coating artificial graphitic carbon anode material surface
  • Method for coating artificial graphitic carbon anode material surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] First, fully mix 100 grams of artificial graphite and 5 grams of phenolic resin, stir evenly, put them into an atmosphere furnace, and carbonize at 1000 ° C for 1 hour. After the sample was cooled, it was taken out and pulverized, and passed through a 325-mesh sieve to obtain coated artificial graphite with a particle size distribution of 11 μm.

Embodiment 2

[0024] Fully mix 100 grams of artificial graphite and 10 grams of phenolic resin, stir evenly, put them into an atmosphere furnace, and carbonize at 1000 ° C for 1 hour. After the sample was cooled, it was taken out and pulverized, and passed through a 325-mesh sieve to obtain coated artificial graphite with a particle size distribution of 11 μm.

Embodiment 3

[0026] First, add 100 grams of artificial graphite to 500 ml of 1% H 2 o 2 Fully stir in the mixture for 0.5 hour at a stirring speed of 200 rpm. After the reaction is complete, suction filter and wash to obtain oxidized artificial graphite. Then add 8 grams of phenol into 200ml of water, add the oxidized artificial graphite into the phenol solution, heat and stir, the stirring speed is 200rpm, the heating temperature is 70°C, stir for 10 minutes, then add 3 grams of formaldehyde solution dropwise , then add hydrochloric acid solution, control the pH of the solution at 1.9, and stir again for 0.5 hours, the in-situ polymerization of the phenolic resin occurs on the surface of the artificial graphite, and the end faces and active points on the surface of the artificial graphite are completely covered. After polymerization, add an appropriate amount of hexamethylenetetramine (hexamethylene) to the solution to cure the phenolic resin. After the curing is complete, wash and separ...

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

No PUM Login to View More

Abstract

The invention relates to a method for coating an artificial graphitic carbon anode material surface, which is characterized in that an in-situ polymerization coating method is employed, artificial graphite is added in H2O2 with certain concentration, rapidly stirred, wherein the stirring speed is 200-500rmp, the stirring time is 0.5-2 hours; then filtered and washed, the oxidized artificial graphite is added in a phenol solution with certain concentration, and heated and stirred, wherein the heating temperature is 70-100 DEG C, the stirring speed is 200-500rpm, the stirring time is 10-60 minutes, and a formaldehyde solution is added drop by drop according to stoichiometric ratio, a hydrochloric acid solution is added after the dropping is completed, the pH value of the solution is controlled at 1.9-2.3, stirring is performed for 0.5-2 hours, then a proper amount of hexamethylene tetramine (urotropine) is added for solidifying phenolic resin, after the solidification is completed, and the sample is washed and separated for drying and carbonizing the sample to obtain the anode material uniformly coated with modified artificial graphite.

Description

technical field [0001] The invention belongs to the field of lithium ion battery materials, and mainly relates to a negative electrode material for lithium ion batteries—a method for surface coating of an artificial graphite carbon negative electrode material. Background technique [0002] With the increasingly severe global energy situation and the increasingly serious urban vehicle exhaust pollution, countries are actively developing electric vehicles. Lithium-ion batteries have become an ideal choice for electric vehicles due to their high energy density, high operating voltage, stable discharge voltage, good low-temperature performance, small self-discharge, no memory effect, environmental friendliness, and long cycle life. Artificial graphite material is a kind of negative electrode material of lithium ion battery. Because of its relatively stable structure, it has good cycle performance, high specific capacity, good low temperature charge and discharge performance and ...

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): C01B31/04H01M4/587C01B32/21
CPCY02E60/12Y02E60/10
Inventor 张波刘红光叶学海宫毓鹏刘庆华孙国娟
Owner CHINA NAT OFFSHORE OIL CORP