Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparation method of a lithium-sulfur battery cathode material with a composite metal-organic framework

An organic framework, lithium-sulfur battery technology, applied in the field of materials chemistry, can solve the problems of poor cycle performance of lithium-sulfur batteries, metal lithium corrosion and loss of active materials, loss of active materials, etc., to improve redox reaction kinetics, excellent cycle Stability, the effect of suppressing the shuttle effect

Active Publication Date: 2021-11-12
INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although sulfur cathode materials have a series of advantages, there are still many problems in the commercial application of sulfur electrodes: (1) The conductivity of elemental sulfur is extremely poor, resulting in low utilization of sulfur
(2) Elemental sulfur and the final discharge product Li 2 The large difference in the density of S leads to significant volume expansion and contraction (about 80%) of the sulfur electrode during the cycle, causing the electrode material to fall off and break during the cycle, which in turn destroys the overall structure of the electrode, resulting in the formation of active substances. Loss
(3) The discharge intermediate product of the sulfur electrode (high-valence lithium polysulfide) has high solubility in the organic electrolyte, and can pass through the separator to reach the negative electrode and lithium to further generate insoluble low-valent lithium sulfide, and attach to the negative electrode On the lithium sheet, a "shuttle effect" occurs, which leads to the corrosion of metal lithium and the loss of active materials, as well as poor cycle performance of lithium-sulfur batteries and serious self-discharge phenomenon

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 a lithium-sulfur battery cathode material with a composite metal-organic framework
  • Preparation method of a lithium-sulfur battery cathode material with a composite metal-organic framework

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0029] The first step: synthesis of ZIF67 material:

[0030] 1.145g Co(NO 3 ) 2 ·6H 2 O was dissolved in 125ml of methanol and stirred until completely dissolved to obtain Co(NO 3 ) 2 ·6H 2 O solution. 1.640 g of 2-methylimidazole (Hmim) was dissolved in 125 mL of methanol, and stirred until completely dissolved to obtain a 2-methylimidazole solution. Slowly pour the 2-methylimidazole solution into the Co(NO 3 ) 2 ·6H 2 In the solution of O, stir for 30 minutes, wait until the purple clear liquid turns into a purple turbid liquid, let it stand for aging for 24 hours, and centrifuge to collect the precipitate. Subsequently, it was centrifuged and washed 5 times with methanol and 2 times with ethanol, and dried under vacuum at 60 °C for 24 hours to obtain the ZIF67 material.

[0031] Step 2: Synthesis of ZIF67 / ZnO material:

[0032] 0.3864g Zn(CH 3 COO) 2 ·H 2 O was added to 50ml of methanol, placed on a heating plate at 65°C and stirred until completely dissolved ...

Embodiment example 2

[0038] The first step: synthesis of ZIF67 material:

[0039] 1.145g Co(NO 3 ) 2 ·6H 2 O was dissolved in 125ml of methanol and stirred until completely dissolved to obtain Co(NO 3 ) 2 ·6H 2 O solution. 1.640 g of 2-methylimidazole (Hmim) was dissolved in 125 mL of methanol, and stirred until completely dissolved to obtain a 2-methylimidazole solution. Slowly pour the 2-methylimidazole solution into the Co(NO 3 ) 2 ·6H 2 In the solution of O, stir for 30 minutes, wait until the purple clear liquid turns into a purple turbid liquid, let it stand for aging for 24 hours, and centrifuge to collect the precipitate. Subsequently, it was centrifuged and washed 5 times with methanol and 2 times with ethanol, and dried under vacuum at 60 °C for 24 hours to obtain the ZIF67 material.

[0040] Step 2: Synthesis of ZIF67 / ZnO:

[0041] 0.3864g Zn(CH 3 COO) 2 ·H 2 O was added to 50ml of methanol, placed on a heating plate at 65°C and stirred until completely dissolved to obtain...

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

No PUM Login to View More

Abstract

The invention relates to a preparation method of a lithium-sulfur battery positive electrode material. The composite material is composed of two metal-organic frameworks, ZIF67 and ZIF8, and then compounded with elemental sulfur to obtain a lithium-sulfur battery positive electrode material. The material can be obtained by a simple method. Synthesized by hydrothermal method, it can well adsorb lithium polysulfide, inhibit the "shuttle effect" of lithium polysulfide, and promote the redox reaction kinetics of lithium-sulfur batteries during charge and discharge, thereby improving the battery life. Discharge capacity improves cycle stability performance.

Description

technical field [0001] The invention relates to a preparation method of a composite metal organic framework material applied to the positive electrode of a lithium-sulfur battery. The composite material is specifically composed of two metal organic frameworks, ZIF67 and ZIF8, and belongs to the field of material chemistry. Background technique [0002] With the continuous emergence of new technologies, new energy products have attracted more and more attention. Higher requirements have been put forward for the energy density and fast charge-discharge capability of commercial batteries. Lithium-ion batteries that have been commercially available at present cannot meet people's needs due to their low energy density. However, when elemental sulfur is used as the positive electrode material, the theoretical energy density of the battery is as high as 2600Wh / kg, and the theoretical specific capacity can reach 1675mA h / g, and sulfur is abundant in nature, low in price and non-tox...

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 Patents(China)
IPC IPC(8): C08G83/00H01M4/62H01M10/052
CPCC08G83/008H01M4/624H01M4/628H01M10/052Y02E60/10
Inventor 钊妍邱伟龙
Owner INT ACAD OF OPTOELECTRONICS AT ZHAOQING SOUTH CHINA NORMAL UNIV