Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Lithium ion battery silicon-carbon composite negative electrode material composite conductive agent, negative electrode plate and preparation method of negative electrode plate

A technology of silicon-carbon composite materials and lithium-ion batteries, which is applied in the direction of battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of not having or meeting the conductive agent for lithium-ion batteries, achieve low impedance, and improve market application Foreground, effect of improving discharge capacity

Inactive Publication Date: 2020-06-05
SHANGHAI ELECTRICGROUP CORP
View PDF6 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing commercialized conductive agents are mainly carbon materials, mainly including conductive graphite, conductive carbon black, and carbon nanotubes. The above-mentioned conductive agents have their own advantages, but they do not have the above-mentioned characteristics that an excellent conductive agent should have. Unable to meet the needs of conductive agents for lithium-ion batteries

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
  • Lithium ion battery silicon-carbon composite negative electrode material composite conductive agent, negative electrode plate and preparation method of negative electrode plate
  • Lithium ion battery silicon-carbon composite negative electrode material composite conductive agent, negative electrode plate and preparation method of negative electrode plate
  • Lithium ion battery silicon-carbon composite negative electrode material composite conductive agent, negative electrode plate and preparation method of negative electrode plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] In this embodiment, the composite conductive agent coated on the negative electrode sheet of the silicon-carbon composite negative electrode material for lithium-ion batteries includes the following components:

[0036]

[0037] In the silicon-carbon composite material, the addition of SiOx or Si is less than 5%, and the designed gram capacity is 450mAh / g.

[0038] The preparation of the negative electrode sheet of the silicon-carbon composite negative electrode material for the above-mentioned lithium ion battery comprises the following steps:

[0039] (1) Configure carboxymethyl cellulose CMC glue, add 0.04kg of CMC powder into deionized water, adjust the solid content of the CMC glue to 5%, stir at 1000rpm for 5 hours, and stir to obtain 0.8kg of CMC glue;

[0040] (2) 0.001kg single-walled carbon nanotubes, 0.02kg graphene, 0.02kg carbon nanofibers and 0.8kg of CMC glue prepared in step (1) were mixed, stirred at 1500rp speed for 1h, to obtain conductive glue;

...

Embodiment 2

[0045]In this embodiment, the composite conductive agent coated on the negative electrode sheet of the silicon-carbon composite negative electrode material for lithium-ion batteries includes the following solid components:

[0046]

[0047] In the silicon-carbon composite material, the addition of SiOx or Si is less than 5%, and the designed gram capacity is 450mAh / g.

[0048] The preparation of the negative electrode sheet of the silicon-carbon composite negative electrode material for the above-mentioned lithium ion battery comprises the following steps:

[0049] (1) Configure carboxymethyl cellulose CMC glue, add 0.04kg of CMC powder into deionized water, adjust the solid content of the CMC glue to 5%, stir at 1000rpm for 5 hours, and stir to obtain 0.8kg of CMC glue;

[0050] (2) 0.001kg of single-walled carbon nanotubes, 0.02kg of graphene, 0.02kg of superconducting carbon black SuperP and the 0.8kg of CMC glue prepared in step (1) were mixed, and stirred for 1h at a s...

Embodiment 3

[0055] In this embodiment, the composite conductive agent coated on the negative electrode sheet of the silicon-carbon composite negative electrode material of the lithium-ion battery includes the following solid components:

[0056]

[0057] In the silicon-carbon composite material, the addition of SiOx or Si is less than 5%, and the designed gram capacity is 450mAh / g.

[0058] The preparation of the negative electrode sheet of the silicon-carbon composite negative electrode material for the above-mentioned lithium ion battery comprises the following steps:

[0059] (1) Configure carboxymethyl cellulose CMC glue, add 0.04kg of CMC powder into deionized water, adjust the solid content of the CMC glue to 5%, stir at 1000rpm for 5 hours, and stir to obtain 0.8kg of CMC glue;

[0060] (2) 0.04kg of superconducting carbon black SuperP and the 0.8kg of CMC glue prepared in step (1) were mixed, and stirred at a speed of 1500rp for 1h to obtain conductive glue;

[0061] (3) Add 1...

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
diameteraaaaaaaaaa
Login to View More

Abstract

The invention discloses a lithium ion battery silicon-carbon composite negative electrode material composite conductive agent, a negative plate and a preparation method of the negative plate. In termsof mass percentage, the composite conductive agent comprises the following solid components: 60-95% of a silicon-carbon composite material, 0.05-0.1% of carbon nanotubes, 0.5-2% of graphene, 0-20% ofan auxiliary carbon black conductive agent, 1-6% of carbon nanofibers, 1-5% of a dispersing agent and 2-8% of a binder. The invention also discloses a negative plate of the composite conductive agentand a preparation method of the negative plate. The lithium ion battery using the silicon-carbon composite negative electrode material composite conductive agent for the lithium ion battery providedby the invention is low in impedance and long in cycle life; and the overall performance of the lithium ion battery is greatly improved, the long-time use requirements of electronic products can be met, the market application prospect of products of battery manufacturers can be improved, and the important production practice significance exists.

Description

technical field [0001] The invention relates to a carbon nanotube conductive material, in particular to a composite conductive agent for a lithium-ion battery silicon-carbon composite negative electrode material, a negative electrode sheet and a preparation method thereof. Background technique [0002] In recent years, with the decrease of fossil energy and the increasingly severe environmental problems, the application of lithium-ion batteries in the field of electric vehicles and energy storage has attracted more and more attention. Lithium-ion batteries are considered to be the most promising electrical energy storage devices due to their higher energy density and power density compared to other types of batteries. [0003] However, the energy density and power density of existing lithium-ion batteries are still low, and their safety and cycle life have not yet met the requirements for future applications in electric vehicles and energy storage systems. [0004] In terms...

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): H01M4/62H01M4/38H01M4/48H01M4/587H01M4/131H01M4/133H01M4/134H01M4/1393H01M4/1395H01M4/1391H01M10/0525
CPCH01M4/131H01M4/133H01M4/134H01M4/1391H01M4/1393H01M4/1395H01M4/386H01M4/483H01M4/587H01M4/625H01M4/628H01M10/0525H01M2004/027Y02E60/10
Inventor 陈献武刘佳丽周兰万玲玉李旺方英军詹吟桥闫海刘超
Owner SHANGHAI ELECTRICGROUP CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com