Graphene-based lithium-ion battery cathode and preparation method thereof

A lithium-ion battery and graphene technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor acceleration performance of electric vehicles, unsatisfactory battery energy density, and mileage requirements of electric vehicles, etc. Effects of ion transmission rate, improved power performance, and high binding force

Inactive Publication Date: 2016-04-13
ZHEJIANG EPTONG TECH CO LTD
View PDF3 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as a power battery used in electric vehicles, there are still two key issues that have not been well resolved: (1) The energy density of the battery cannot meet the requirements of the cruising range of electric vehicles
(2) Large current discharge will cause great damage to the battery, resulting in poor acceleration performance of electric vehicles
Due to the existence of polybutadiene block in SBR, it is an adhesive with excellent viscoelasticity. Although SBR shows excellent performance in traditional lithium-ion batteries, it still lacks performance in negative electrodes with graphene. We think it is mainly because the adhesion of graphite and graphene to graphite and graphene is greatly affected after SBR swells the electrolyte.

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
  • Graphene-based lithium-ion battery cathode and preparation method thereof
  • Graphene-based lithium-ion battery cathode and preparation method thereof
  • Graphene-based lithium-ion battery cathode and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Coating the negative electrode slurry of the lithium ion battery on the copper foil to prepare the negative electrode of the lithium ion battery has a thickness of 200 microns. The weight ratio formula of each raw material in the slurry is: 35 parts by weight of graphite, 25 parts by weight of graphene, 2.5 parts by weight of binder, 2 parts by weight of thickener, and 70.0 parts by weight of dispersion medium. The particle size of the graphite is 500 mesh; the graphene is reduced graphene oxide with a particle size of 300 mesh. The binder is polystyrene-polyisoprene-polystyrene block copolymer latex, the molecular weight of the block copolymer is 15K-150K-15K, and the solid content of the latex is 35%. The thickener is sodium carboxymethyl cellulose; the dispersion medium is deionized water.

[0033] The lithium-ion battery negative electrode slurry is prepared through the following processing techniques: Add all thickeners, all conductive agents, all graphite and a...

Embodiment 2

[0036] The lithium ion battery negative electrode slurry was coated on copper foil to prepare a lithium ion battery negative electrode with a thickness of 50 microns. The weight ratio formula of each raw material in the slurry is: 50 parts by weight of graphite, 15 parts by weight of graphene, 0.5 part by weight of binder, 0.25 part by weight of thickener, and 90.0 parts by weight of dispersion medium. The particle diameter of the graphite is 300 meshes; the graphene is reduced graphene oxide, and the particle diameter is 200 meshes. The binder is polystyrene-polyisoprene-polystyrene block copolymer latex, the molecular weight of the block copolymer is 50K-100K-50K, and the solid content of the latex is 15%. The thickener is sodium carboxymethyl cellulose; the dispersion medium is deionized water.

[0037] The lithium ion battery negative electrode slurry is prepared by the following processing technology: In the ball mill, add all the thickeners, all the conductive agents,...

Embodiment 3

[0040] The lithium ion battery negative electrode slurry was coated on copper foil to prepare a lithium ion battery negative electrode with a thickness of 150 microns. The weight ratio of each raw material in the slurry is as follows: 45 parts by weight of graphite, 10 parts by weight of graphene, 1.5 parts by weight of binder, 1 part by weight of thickener, and 80 parts by weight of dispersion medium. The particle diameter of the graphite is 300 meshes; the graphene is reduced graphene oxide, and the particle diameter is 200 meshes. The binder is polystyrene-polyisoprene-polystyrene block copolymer latex, the molecular weight of the block copolymer is 15K-40K-15K, and the solid content of the latex is 35%. The thickener is sodium carboxymethyl cellulose; the dispersion medium is deionized water.

[0041] The lithium ion battery negative electrode slurry is prepared by the following processing technology: In the ball mill, add all the thickeners, all the conductive agents, ...

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
thicknessaaaaaaaaaa
particle size (mesh)aaaaaaaaaa
particle size (mesh)aaaaaaaaaa
Login to view more

Abstract

The invention relates to a graphene-based lithium-ion battery cathode and a preparation technology thereof. According to the technology, cathode slurry taking graphite doped graphene as an active substance is prepared and applied to copper foil, and the lithium-ion battery cathode is prepared. A novel polystyrene-polyisoprene-polystyrene block polymer binder is adopted in the technology, has higher binding force for graphene and can provide high elasticity and improve performance of the graphene-based lithium-ion battery cathode, the obtained high-energy density type cathode has 410 mAh / g of energy density during 0.2 C charging and discharging, and the power type cathode has 310 mAh / g of energy density during 5 C charging and discharging. Raw materials are economical and easy to obtain, and the technology is simple and environment-friendly.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a graphene-based lithium ion battery negative electrode and a preparation method thereof. Background technique [0002] In recent years, due to the energy crisis and the aggravation of environmental pollution and other reasons, electric vehicle technology has begun to receive extensive attention from governments of various countries. For a long period of time in the future, only lithium-ion batteries will have the appropriate energy density and cycle life to meet the needs of electric vehicles. 2014 is called by many people the "first year" of the development of new energy vehicles in China, because in this year, the development of new energy vehicles in the Chinese market has achieved a "quantity" breakthrough, becoming the second largest in the world after the United States. electric vehicle market. Preliminary statistics show that sales in the U.S. market are close to 120,000 vehicle...

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): H01M4/133H01M4/1393H01M4/587H01M4/62H01M10/0525
CPCH01M4/133H01M4/1393H01M4/587H01M4/622H01M10/0525Y02E60/10
Inventor 胡明杰韩如冰高翔唐庆山王斌王春见
Owner ZHEJIANG EPTONG TECH CO LTD
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
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap