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A kind of preparation method of positive electrode composite material of lithium-sulfur secondary battery

A lithium-sulfur secondary battery and composite material technology, which is applied to secondary batteries, battery electrodes, circuits, etc., can solve the problems of low capacity and low sulfur content of lithium-sulfur batteries, prevent overoxidation, and improve sulfur content. , the condition is easy to control the effect

Inactive Publication Date: 2017-10-31
JIANGXI DIBIKE
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AI Technical Summary

Problems solved by technology

[0003] Lithium-sulfur batteries using sulfur-carbon composites as positive electrodes have the advantages of stable cycle performance, extremely low battery self-discharge, and high safety. However, the sulfur content of such carbon-sulfur composites is generally low at present, causing The lithium-sulfur battery composed of it has a low capacity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] (1), using coaxial spinning method to prepare porous hollow carbon nanofibers

[0056] First, polyacrylonitrile was dissolved in DMF, and magnetically stirred at 90 degrees Celsius for 20 hours to obtain a polyacrylonitrile solution with a mass fraction of 8 wt.%.

[0057]Then PMMA was dissolved in DMF, and magnetically stirred at room temperature for 20 h to obtain a PMMA solution with a mass fraction of 14 wt.%.

[0058] The polyacrylonitrile solution was used as the external liquid of electrospinning, and the PMMA solution was used as the internal liquid of electrospinning for coaxial electrospinning, wherein the adjusted voltage was 18kV, the flow rate of the internal liquid was 0.8mL / h, and the flow rate of the external liquid was The flow rate is 0.3mL / h;

[0059] The prepared nanofibers were heated at a heating rate of 5°C / min and kept at 250°C for 1.5h, then raised to 1300°C at a heating rate of 5°C / min and held at 1h;

[0060] (2), prepare vulcanization accel...

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PUM

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Abstract

The invention discloses a preparation method of a composite cathode material of a lithium / sulfur rechargeable battery. The method comprises the steps of mixing and grinding a carbon source, a sulfur source and a vulcanization accelerator in mass ratio of 4: (4-6): (0.4-0.6); maintaining the temperature for 7 to 24 hours at the temperature of 155 to 300 DEG C. According to the method, hydrogen peroxide is used as an oxidant to synthesize the vulcanization accelerator, so that the environmental protection is achieved, and moreover, the conditions are easily controlled; when in synthesizing, the pH of the reaction liquid is controlled to be 9.8 to 10.3, so as to prevent the peroxidation phenomenon; in addition, the vulcanization accelerator prepared under such condition is applied to the sulfur and carbon composite material of a cathode of the lithium / sulfur rechargeable battery, thus the sulfur content can be obviously increased, and the sulfur content can reach 47wt.% by weight to the maximum.

Description

technical field [0001] The present application relates to a lithium-sulfur secondary battery, in particular to a method for preparing a positive electrode composite material of a lithium-sulfur secondary battery. Background technique [0002] Rechargeable lithium-sulfur battery with a theoretical capacity of up to 1675mAhg -1 , almost higher than the current commercial cathode LiFePO 4 An order of magnitude of lithium-ion secondary batteries, and sulfur as the positive active material is not only low in cost, non-toxic, but also rich in content. [0003] Lithium-sulfur batteries using sulfur-carbon composites as positive electrodes have the advantages of stable cycle performance, extremely low battery self-discharge, and high safety. However, the sulfur content of such carbon-sulfur composites is generally low at present, causing Lithium-sulfur batteries composed of it have low capacity. Contents of the invention [0004] The purpose of the present invention is to provi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36
CPCH01M4/36H01M4/362H01M4/583H01M4/62H01M10/36Y02E60/10
Inventor 曾金辉刘文平
Owner JIANGXI DIBIKE