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

Preparation method of carbon-based flexible lithium-sulfur battery cathode material of porous structure

A carbon-based flexible lithium-sulfur battery technology, applied in battery electrodes, structural parts, circuits, etc., can solve the problems of lithium polysulfide intermediates easily soluble in electrolyte, sulfur active materials with poor conductivity, and inability to bend and fold, etc., to achieve Effects of slowing down the speed of dissolution and diffusion, increasing loading capacity, good operability and uniformity

Active Publication Date: 2019-09-03
ZHUHAI COSMX BATTERY CO LTD
View PDF5 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems that the traditional lithium-sulfur battery cannot be folded and bent, the conductivity of the sulfur active material is poor, the volume of the sulfur electrode rapidly expands and deforms after lithium intercalation, and the lithium polysulfide intermediate product generated during the discharge process is easily soluble in the electrolyte. Provided is a method for preparing a porous carbon-based flexible lithium-sulfur battery positive electrode material
[0005] In the present invention, a three-dimensional carbon-based conductive fiber network with a certain strength is selected as the carrier and conductive network of the positive electrode material of the flexible lithium-sulfur battery, and the sulfur active material is evenly dispersed in the porous network of the conductive fiber network through the method of dissolution recrystallization and high-temperature diffusion In the structure, it solves the problem that the cathode material of conventional lithium-sulfur batteries cannot be bent and folded

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
  • Preparation method of carbon-based flexible lithium-sulfur battery cathode material of porous structure
  • Preparation method of carbon-based flexible lithium-sulfur battery cathode material of porous structure
  • Preparation method of carbon-based flexible lithium-sulfur battery cathode material of porous structure

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0022] Specific implementation mode 1: This implementation mode records a method for preparing a porous structure carbon-based flexible lithium-sulfur battery positive electrode material. The specific steps of the method are as follows:

[0023] Step 1: use the three-dimensional carbon-based conductive fiber network as a current collector, and immerse it in a solution containing a sulfur active substance; or first immerse the three-dimensional carbon-based conductive fiber network as a current collector in a solvent, and then mix it with a solution containing a sulfur active substance; The concentration of the solution containing the sulfur active substance is 0.05-1.5 g / mL, and the ambient temperature of this step is 5-45°C;

[0024] Step 2: Under a closed vacuum or high pressure condition, the solution containing the sulfur active substance is infiltrated into the pore structure of the three-dimensional carbon-based conductive fiber network by shaking, and the same pressure c...

specific Embodiment approach 2

[0026] Specific embodiment 2: The preparation method of a porous carbon-based flexible lithium-sulfur battery positive electrode material described in specific embodiment 1, the described three-dimensional carbon-based conductive fiber network has a rich pore structure such as figure 1 , 2 As shown in the BET test results, including micropores, mesopores and macropores, the pore structure is mainly distributed in the range of micropores and mesopores from 0.5 to 3.5 nm.

specific Embodiment approach 3

[0027] Embodiment 3: The preparation method of a porous structure carbon-based flexible lithium-sulfur battery positive electrode material described in Embodiment 1. In step 1, the three-dimensional carbon-based conductive fiber network is prepared according to the following method:

[0028] Using carbon fibers or materials that can form highly conductive carbon-based fibers after carbonization as raw materials, treat them in an atmosphere with an oxidation volume concentration of 1% to 80% at 250-610°C to partially oxidize the carbon materials to obtain a ratio with a certain strength. A three-dimensional carbon-based conductive fiber network with controllable surface area, high conductivity and flexibility; the treatment temperature is 250-610° C., and the oxygen volume concentration is 1%-80%.

[0029] The three-dimensional carbon-based conductive fiber network can be a carbon-based fiber with certain conductivity and strength made of natural cellulose fibers such as bamboo,...

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 relates to a preparation method of a carbon-based flexible lithium-sulfur battery cathode, belonging to the technical field of preparation of lithium-sulfur battery materials for electrochemical energy storage. The method comprises the following steps of: preparing a three-dimensional conductive carbon network by annealing carbon fibers in an oxidizing atmosphere, taking the three-dimensional conductive carbon fiber network as a current collector, immersing the three-dimensional conductive carbon fiber network into carbon disulfide of sulfur, soaking a carbon fiber hole structurewith a sulfur solution by ultrasonic waves or mechanical oscillation under vacuum, performing evaporating to dryness, and further diffusing the sulfur into finer gaps of the carbon fibers by high-temperature gas phase diffusion to form a carbon-based flexible lithium-sulfur battery cathode with the sulfur uniformly distributed in the three-dimensional conductive carbon fiber network. The flexiblebattery assembled by the self-supporting electrodes can keep high and stable charge and discharge capacity under different folding angles. The preparation method of the self-supporting flexible electrode is simple to operate and easy for large-scale production, is capable of being widely applied to energy storage and flexible wearable equipment, and is good in practical value.

Description

technical field [0001] The invention belongs to the technical field of preparation of lithium-sulfur battery materials, and in particular relates to a preparation method of a porous carbon-based flexible lithium-sulfur battery cathode material. Background technique [0002] With the improvement of people's material and cultural needs and the rapid development of science and technology, convenient and lightweight portable wearable electronic products have been greatly loved by people, including flexible, bendable and foldable displays, electronic paper, flexible batteries, etc. Therefore, there will be huge market demand and space for portable, wearable, flexible and lightweight energy storage devices, and there will be great room for development as lithium-ion batteries with high energy density, strong safety, and easy portability. At present, the energy density of traditional lithium-ion batteries such as lithium cobalt oxide, lithium manganese oxide, lithium iron phosphate...

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): H01M4/36H01M4/58H01M4/62
CPCH01M4/364H01M4/5815H01M4/625Y02E60/10
Inventor 伍鹏潘跃德李素丽曾家江李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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