Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Modification method of graphite negative plate of lithium ion battery

A technology for lithium-ion batteries and graphite negative electrodes, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of cumbersome process, increase of specific surface area and defects, and decrease of Coulombic efficiency, etc., and achieve simple and controllable preparation process, The effect of excellent cycle performance and excellent rate performance

Pending Publication Date: 2022-02-01
BEIJING UNIV OF CHEM TECH
View PDF0 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the specific surface area and defects of the sample increase, and the first Coulombic efficiency decreases
At the same time, there are still problems such as cumbersome process, high energy consumption, environmental pollution, equipment corrosion, product repeatability and poor controllability of morphology and structure.

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
  • Modification method of graphite negative plate of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Flake graphite will be used as the graphite electrode material to prepare graphite electrode sheets. Using a 1064nm laser, with an output power of 10w and a scanning speed of 10cm / s, set a preset area for laser focus spot scanning on the flake graphite electrode sheet, and perform laser etching under a certain atmosphere to obtain the final graphite electrode sheet.

[0022] The graphite electrode sheet exhibits a discharge specific capacity of 364mAh / g at a current density of 50mA / g, and still has a capacity of 210mA / g at a current density of 1A / g.

Embodiment 2

[0024] Graphitized onion carbon will be used as graphite electrode material to prepare graphite electrode sheet. Using a 1064nm laser, with an output power of 10w and a scanning speed of 10cm / s, set a preset area for laser focus spot scanning on the flake graphite electrode sheet, and perform laser etching under a certain atmosphere to obtain the final graphite electrode sheet.

[0025] as attached figure 1 The graphitized onion carbon anode before and after laser modification shown shows good rate performance.

[0026] The graphite electrode sheet exhibits a discharge specific capacity of 402mAh / g at a current density of 50mA / g, and still has a capacity of 265mA / g at a current density of 1A / g.

Embodiment 3

[0028] Graphitized onion carbon will be used as graphite electrode material to prepare graphite electrode sheet. Using a 450nm laser, with an output power of 5w and a scanning speed of 10cm / s, set a preset area for laser focus spot scanning on the flake graphite electrode sheet, and perform laser etching under a certain atmosphere to obtain the final graphite electrode sheet.

[0029] The graphite electrode sheet exhibits a discharge specific capacity of 371 mAh / g at a current density of 50 mA / g, and still has a capacity of 205 mA / g at a current density of 1 A / g.

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 provides a method for modifying a graphite negative plate by laser etching for a lithium ion battery. The prepared graphite negative electrode plate which is not treated is placed under a laser probe, and laser parameters are adjusted. And under the condition that the overall structure of the graphite negative plate is not damaged, the surface of the graphite negative plate is subjected to laser etching, so that gullies and defects are formed, and a final product is obtained. The problems that in the prior art, traditional heat treatment, chemical etching, mechanical activation and other procedures are complex, the environment is polluted, and energy consumption is large are solved. The electrochemical performance of the graphite electrode after laser etching is remarkably improved, the graphite electrode shows the specific discharge capacity of 300-450 mAh / g under the current density of 50 mA / g, still has the capacity of 120-350 mA / g after 300 cycles under the current density of 1 A / g, and has high specific discharge capacity and good cycle stability. The method provides a simple, green and universal strategy for structural modification and performance improvement of the graphite negative plate.

Description

Technical field: [0001] The invention relates to the field of lithium ion battery materials, and provides a method related to laser etching modified graphite negative electrode sheet and its application as a lithium ion battery negative electrode. Background technique: [0002] As an important part of the secondary energy storage battery, the anode material plays a decisive role in its performance. Among them, graphite has become the most commercialized negative electrode material due to its rich resources, low cost, environmental friendliness, low charge and discharge voltage platform, and good stability. Although there are many materials with high specific capacity to choose from (such as Si, Sn, Sb, and metal oxides), these materials are usually accompanied by disadvantages such as low density, low Coulombic efficiency, and high potential platform, which lead to their practical application. The value is far lower than that of graphite materials. In the next few decades,...

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): H01M4/1393H01M10/0525B23K26/362
CPCH01M4/1393H01M10/0525B23K26/362H01M2004/027Y02E60/10
Inventor 宋怀河孟晨阳贾梦秋李昂
Owner BEIJING UNIV OF CHEM TECH
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
Eureka Blog
Learn More
PatSnap group products