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A kind of conductive janus film, preparation method and its application in the preparation of lithium-sulfur battery positive electrode

A technology of concentrated sulfuric acid and solution, applied in the field of Janus membrane

Active Publication Date: 2021-09-21
清创人和生态工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no related research on the application of Janus membrane to the positive electrode of lithium-sulfur batteries

Method used

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  • A kind of conductive janus film, preparation method and its application in the preparation of lithium-sulfur battery positive electrode
  • A kind of conductive janus film, preparation method and its application in the preparation of lithium-sulfur battery positive electrode
  • A kind of conductive janus film, preparation method and its application in the preparation of lithium-sulfur battery positive electrode

Examples

Experimental program
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Effect test

Embodiment 1

[0038] A conductive Janus film, comprising the following raw materials: 0.1g of multi-walled carbon nanotubes, 20ml of concentrated sulfuric acid solution, 8ml of concentrated nitric acid solution, 200ml of deionized water, 2ml of organic silane coupling agent, 1g of anionic surfactant, polytetrafluoroethylene 0.02g, nitrogen methyl pyrrolidone solution 2ml, sublimated sulfur 1mg, CS 2 Solution 0.1ml, isopropanol solution 0.3ml.

[0039] Further, the organosilane coupling agent is a methanol solution of 3-(trimethoxysilylpropyl)dimethyloctadecylammonium chloride.

[0040] Further, the anionic surfactant is sodium nonylphenol polyoxyethylene ether sulfate.

[0041] Specifically, the concentration of the concentrated sulfuric acid is 70wt%.

[0042] Specifically, the concentration of the concentrated nitric acid is 68wt%.

[0043] Specifically, the concentration of the 3-(trimethoxysilylpropyl)dimethyloctadecylammonium chloride is 30% methanol solution.

[0044] Specifically...

Embodiment 2

[0055] A conductive Janus film, comprising the following raw materials: 0.2g of multi-walled carbon nanotubes, 10ml of concentrated sulfuric acid solution, 10ml of concentrated nitric acid solution, 250ml of deionized water, 4ml of organosilane coupling agent, 2g of anionic surfactant, polytetrafluoroethylene 0.04g, nitrogen methyl pyrrolidone solution 3ml, sublimated sulfur 2mg, CS 2 0.25ml solution, 1ml isopropanol solution.

[0056] Example 1 was repeated according to the same steps.

Embodiment 3

[0058] A conductive Janus film, comprising the following raw materials: 0.3g of multi-walled carbon nanotubes, 40ml of concentrated sulfuric acid solution, 5ml of concentrated nitric acid solution, 500ml of deionized water, 6ml of organosilane coupling agent, 3g of anionic surfactant, polytetrafluoroethylene 0.06g, nitrogen methyl pyrrolidone solution 1ml, sublimated sulfur 3mg, CS 2 Solution 0.5ml, isopropanol solution 0.5ml.

[0059] Example 1 was repeated according to the same steps.

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Abstract

A conductive Janus film provided by the invention comprises the following raw materials: 0.1-0.6 g of multi-walled carbon nanotubes, 10-40 ml of concentrated sulfuric acid solution, 5-10 ml of concentrated nitric acid solution, 200-500 ml of deionized water, and an organic silane coupling agent 2~8ml, anionic surfactant 1~3g, polytetrafluoroethylene 0.01~0.06g, nitrogen methyl pyrrolidone solution 1~3ml, sublimated sulfur 1~3mg, CS 2 0.1~0.5ml solution, 0.5~1ml isopropanol solution; the preparation method includes the following steps: 1) preparing oxidized multi-walled carbon nanotubes, 2) preparing ammonized carbon nanotubes, 3) preparing anionic carbon nanotubes, 4) Preparation of flexible carbon nanotubes, 5) preparation of sulfur@carbon nanotube composite materials, 6) preparation of conductive Janus film; the invention has the ability to significantly improve the discharge specific capacity, electrochemical performance and cycle of lithium-sulfur batteries for the positive electrode of lithium-sulfur batteries Beneficial effects of properties applicable to the field of Janus membranes.

Description

technical field [0001] The invention relates to the technical field of Janus membranes, in particular to a conductive Janus membrane, a preparation method and an application thereof in preparing positive electrodes of lithium-sulfur batteries. Background technique [0002] A lithium-sulfur battery is a lithium battery in which sulfur is used as the positive electrode of the battery and metallic lithium is used as the negative electrode. Since sulfur is a non-conductive substance, traditional lithium-sulfur batteries generally use a combination of sulfur and conductive carbon materials to improve conductivity. The shuttle effect and the volume expansion effect of the electrode are limited, and the capacity and cycle life of the prepared battery are usually very poor. Therefore, the development of flexible cathode materials with ion selectivity and good conductivity is expected to solve the problems of lithium-sulfur batteries and improve the electrochemical performance of ba...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052
CPCH01M4/366H01M4/38H01M4/625H01M4/628H01M10/052H01M2004/021H01M2004/028Y02E60/10
Inventor 周娴娴李敏刘世斌原沁波段东红
Owner 清创人和生态工程技术有限公司