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

Method for preparing lithium-sulfur battery positive electrode material from three-dimensional mesoporous biochar

A cathode material, lithium-sulfur battery technology, applied in battery electrodes, lithium storage batteries, active material electrodes, etc., can solve the problems of storing sulfur substances, unable to provide large pore volume, etc., to improve electrical conductivity, good electrochemical advantages, The effect of avoiding harm

Active Publication Date: 2020-08-18
TIANJIN UNIV
View PDF8 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the charging and discharging process, the CoS 2 Usually cannot provide large pore volume to store sulfur species, and has significant volume expansion

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
  • Method for preparing lithium-sulfur battery positive electrode material from three-dimensional mesoporous biochar
  • Method for preparing lithium-sulfur battery positive electrode material from three-dimensional mesoporous biochar
  • Method for preparing lithium-sulfur battery positive electrode material from three-dimensional mesoporous biochar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: A method for preparing a three-dimensional mesoporous biocarbon-made lithium-sulfur battery positive electrode material, the specific steps are as follows:

[0022] Step 1: Add 25 grams of glucose, 7.5 grams of yeast powder, 10 grams of peptone, and 10 grams of disodium hydrogen phosphate into a large beaker filled with ultrapure water in sequence, stir the solution until it is clear, then add glacial acetic acid dropwise until pH = 4- 5. Obtain the bacterial growth solution;

[0023] Step 2: Pour the bacterial growth liquid into the Erlenmeyer flask, put it into a high-temperature sterilization box at 155°C for 30 minutes, and air-cool the sterilized growth liquid to room temperature, then transfer the strain of Acetobacter xylinum into the Cultivate in an incubator at 30°C for 7 days to form a pale yellow BC liquid gel;

[0024] Step 3: Soak the pale yellow BC liquid gel in deionized water at 80° C. for 5 hours, and then purify it in 0.5 mol / L NaOH solu...

Embodiment 2

[0032] Example 2: Preparation of three-dimensional mesoporous biochar S@CoS 2 / N-CNFs (40%) the method of lithium-sulfur battery cathode material, in embodiment 2, except that step 4 is different from the step in embodiment 1, other steps are all the same. In step four, 0.2 g of CoCl 2 ·6H 2 O, 0.4 g Na 2 S 2 o 3 ·5H 2 O and 0.067 g of melamine were dissolved in 30 mL of deionized water containing 0.1 g of bacterial cellulose airgel and subjected to hydrothermal synthesis at 130 °C for 12 h to obtain 50% CoS 2 The nitrogen doping amount under 40% hydrothermal product, denoted as CoS 2 / 40%N-BC, thus preparing the cathode material S@CoS for lithium-sulfur batteries 2 / N-CNFs (40%), and a button battery corresponding to the cathode material was prepared.

[0033] Figure 4 and Figure 5 Respectively the CoS that embodiment 2 makes 2 / N-CNFs (40%) X-ray diffraction patterns and scanning electron microscope topography, Figure 4 shows that the 40% N doping in Example 2...

Embodiment 3

[0034] Example 3: Preparation of three-dimensional mesoporous biochar S@CoS 2 / N-CNFs (60%) lithium-sulfur battery cathode material method, in embodiment 3, except that step 4 is different from the step in embodiment 1, other steps are the same. In step four, 0.2 g of CoCl 2 ·6H 2 O, 0.4 g Na 2 S 2 o 3 ·5H 2 O and 0.15 g of melamine were dissolved in 30 mL of deionized water containing 0.1 g of bacterial cellulose airgel and subjected to hydrothermal synthesis at 130 °C for 12 h to obtain 50% CoS 2 The nitrogen doping amount under 60% hydrothermal product, denoted as CoS 2 / 60%N-BC, thus preparing the cathode material S@CoS for lithium-sulfur batteries 2 / N-CNFs (60%), and a button battery corresponding to the cathode material was prepared.

[0035] Figure 7 and Figure 8 Respectively the CoS that embodiment 3 makes 2 / N-CNFs (60%) X-ray diffraction patterns and scanning electron microscope topography, Figure 7 showed that the 60% N doping in Example 3 did not af...

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
Diameteraaaaaaaaaa
Diameteraaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for preparing a lithium-sulfur battery cathode material from three-dimensional mesoporous biochar. The method comprises the following steps of transferring acetobacterxylinum into a prepared growth solution, culturing to obtain a BC product, and carrying out subsequent treatment to obtain BC aerogel; then, carrying out hydrothermal synthesis on the BC aerogel, CoCl2. 6H2O, Na2S2O3. 5H2O and melamine, and obtaining a series of CoS2 / N-BC with different N-containing ratios; and finally, carbonizing CoS2 / N-BC, and carrying out high-temperature melting sulfur loading on the carbonized CoS2 / N-BC and sulfur in a certain mass ratio in a tubular furnace filled with N2 to obtain the three-dimensional mesoporous S-coated CoS2 / N-CNFs lithium-sulfur battery positive electrode material composed of biochar. The BC has high specific surface area and high porosity, and the fiber surface is rich in-OH functional groups, so that CoS2 and N atoms can be uniformly loaded to the BC. The N-doped and CoS2 nano particles provide sulfur nucleophilic sites, and the shuttle effect in the electrochemical process is inhibited by chemically adsorbing lithium polysulfide (LiPSs),so that the cycle life of the electrode material is prolonged.

Description

technical field [0001] The invention relates to a preparation method of a lithium-sulfur battery cathode material, in particular to a preparation of a three-dimensional mesoporous biocarbon-made lithium-sulfur battery cathode material. Background technique [0002] Rechargeable lithium-sulfur batteries are a promising option for energy storage applications due to their low cost and high energy density. However, the electrochemical performance of sulfur cathodes is greatly compromised due to the rapid capacity fading caused by polysulfide dissolution / shutling and the low specific capacity due to the poor conductivity of active materials. To address these issues, efforts have been made to optimize the structural design of various host materials, especially carbon nanomaterials. However, polysulfides cannot be effectively anchored in long-term cycling due to the lack of chemical affinity. To improve the anchoring of intermediate polysulfides, inorganic polar materials (especi...

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): H01M4/36H01M4/38H01M4/58H01M4/62H01M10/052C01B32/05C01G51/00
CPCC01G51/30C01B32/05H01M4/364H01M4/38H01M4/5815H01M4/625H01M10/052C01P2002/72C01P2004/03C01P2006/40H01M2004/028Y02E60/10
Inventor 郭瑞松王淑慧
Owner TIANJIN UNIV
Features
  • Generate Ideas
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com