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

Lithiated vulcanized polyacrylonitrile, preparation method thereof, positive pole plate and lithium-sulfur secondary battery

A technology for vulcanizing polyacrylonitrile and polyacrylonitrile molecular structure, which is applied in the direction of secondary batteries, battery electrodes, non-aqueous electrolyte battery electrodes, etc., and can solve the problems of unfavorable high energy density lithium-sulfur secondary batteries, low active material loading, etc. problems, to achieve the effect of increasing sulfur loading and capacity per unit area, and optimizing preparation conditions

Active Publication Date: 2019-11-05
CONTEMPORARY AMPEREX TECH CO
View PDF5 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to form an effective force between the sulfurized polyacrylonitrile (SPAN) material and the binder commonly used in traditional lithium-ion batteries, resulting in a low loading of active materials in the positive electrode, which is not conducive to obtaining lithium-sulfur disulfide with high energy density. secondary battery

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
  • Lithiated vulcanized polyacrylonitrile, preparation method thereof, positive pole plate and lithium-sulfur secondary battery
  • Lithiated vulcanized polyacrylonitrile, preparation method thereof, positive pole plate and lithium-sulfur secondary battery
  • Lithiated vulcanized polyacrylonitrile, preparation method thereof, positive pole plate and lithium-sulfur secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Preparation of sulfur active material S1#:

[0045] (1) Evenly mix elemental sulfur and polyacrylonitrile (molecular weight: 150,000) in a mortar at a mass ratio of 8:1, mix with an appropriate amount of ethanol, and ball mill for two hours. After the material is dried in a blast oven at 60°C, it is calcined at 300°C for 10 hours under the protection of nitrogen atmosphere, so that the main chain of the acrylonitrile polymer undergoes dehydrogenation reaction to form a matrix, and the elemental sulfur melts and polymerizes with the dehydrogenated acrylonitrile Sulfurized polyacrylonitrile material (SPAN) was obtained by compounding the material matrix, and the elemental analyzer (EA, Perkin Elmer PE2400II) was used to test that the mass content of sulfur (S) element was 45%, and the total mass content of nitrogen (N) element was 11%. X-ray photoelectron spectroscopy (XPS, AXIS ULTRA DLD) was used to analyze the change of the nitrogen content of the cyano group in the vu...

Embodiment 2

[0051] Preparation of sulfur active material S2#: the same process as described in Example 1.

[0052] Preparation of the positive electrode sheet P2#: the same as the positive electrode sheet preparation method described in Example 1, the difference is that the mass ratio of the binder PAA / P (HEA-co-DMA) and graphene in the conductive adhesive is replaced by 1:1 It is 1:3, and the positive plate is recorded as P2#.

[0053] Preparation of lithium-sulfur secondary battery C2#: the same process as described in Example 1.

Embodiment 3

[0055] Preparation of sulfur active material S3#: the same process as described in Example 1.

[0056] Preparation of the positive electrode sheet P3#: same as the method for preparing the positive electrode sheet described in Example 1, the difference is that the mass ratio of the binder PAA / P (HEA-co-DMA) to graphene in the conductive adhesive is replaced by 1:1 It is 3:1, and the positive plate is recorded as P2#.

[0057] Preparation of lithium-sulfur secondary battery C3#: the same process as described in Example 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
Weightaaaaaaaaaa
Thicknessaaaaaaaaaa
Login to View More

Abstract

The invention relates to the technical field of lithium-sulfur secondary batteries, and mainly relates to lithiated vulcanized polyacrylonitrile used as a lithium-sulfur secondary battery positive electrode active material and a positive pole plate and lithium-sulfur secondary battery comprising the active material. The lithiated vulcanized polyacrylonitrile is prepared by lithiation of vulcanizedpolyacrylonitrile. By lithiation of the vulcanized polyacrylonitrile, the vulcanized polyacrylonitrile active material generates hydrophilic carboxylate ions, a hydrogen bond with a relatively high acting force is favorably formed in a system when the vulcanized polyacrylonitrile active material is combined with a conductive binding agent, and the sulfur-loading quantity and the unit area capacity of a positive electrode are favorably improved.

Description

technical field [0001] The present application relates to the technical field of lithium batteries, and mainly relates to a lithiated sulfurized polyacrylonitrile used as a positive electrode active material for a lithium-sulfur secondary battery, and a positive electrode sheet including the active material and a lithium-sulfur secondary battery. Background technique [0002] With the rapid development of modern electric vehicles, the energy density of traditional lithium-ion batteries can only reach 300Wh / kg, which has been difficult to meet the increasing demand for energy density in the field of power batteries. In many cutting-edge battery research and development fields, sulfur as a cathode material not only has a high theoretical specific capacity (1675mAh / g) and energy density (2600Wh / kg), but also has the advantages of low cost and environmental friendliness. Therefore, lithium-sulfur secondary batteries are gradually attracting the attention of scientific researcher...

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
IPC IPC(8): H01M4/13H01M4/137H01M10/0525
CPCH01M4/13H01M4/137H01M10/0525Y02E60/10
Inventor 刘成勇许志新郭永胜杨军梁成都
Owner CONTEMPORARY AMPEREX TECH CO
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