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A polymer composite positive electrode material for lithium-sulfur battery and preparation method thereof

A composite positive electrode material, lithium-sulfur battery technology, applied in the direction of battery electrodes, lithium storage batteries, non-aqueous electrolyte storage batteries, etc., can solve the problems that have not been reported, and achieve the effect of improving utilization rate, low equipment requirements, and simple preparation process

Active Publication Date: 2018-11-30
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few reports on the use of conductive polymer PEDTT as a cathode material for lithium-sulfur batteries, and there is no report on the preparation of poly(3,4-ethylenedithiothiophene)-sulfur nanocomposite cathode materials by electrospinning.

Method used

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  • A polymer composite positive electrode material for lithium-sulfur battery and preparation method thereof
  • A polymer composite positive electrode material for lithium-sulfur battery and preparation method thereof

Examples

Experimental program
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Effect test

example 1

[0026] 1) Dichloromethane and CS 2 Prepare a mixed solvent according to a mass ratio of 1:1, and weigh poly(3,4-ethylenedithiothiophene) and elemental sulfur respectively according to a mass ratio of 15:85;

[0027] 2) Mix the weighed sulfur with the mixed solvent in 1) at a mass fraction of 25%, and stir on a magnetic stirrer at 65° C. for 2 hours to obtain a transparent solution;

[0028] 3) Mix the weighed poly(3,4-ethylenedithiothiophene) with the mixed solvent in 1) at a mass fraction of 25%, and stir on a magnetic stirrer at 65° C. for 2 hours to obtain a transparent solution;

[0029] 4) Mix the two solutions in 2) and 3) uniformly to make a spinning solution, use a syringe with a specification of 10ml, extract the spinning solution, and perform electrospinning at room temperature, the spinning condition is: humidity: 40% Spinning voltage: 15KV, receiving distance: 15cm, advancing speed: 0.1ml / h. After 30 minutes, a poly(3,4-ethylenedithiothiophene)-sulfur nanofiber m...

example 2

[0031] 1) Forming chloroform and carbon tetrachloride into a mixed solvent at a mass ratio of 1:2, and weighing poly(3,4-ethylenedithiothiophene) and elemental sulfur at a mass ratio of 30:70;

[0032] 2) Mix the weighed sulfur with the mixed solvent in 1) at a mass fraction of 20%, and stir on a magnetic stirrer at 65° C. for 2 hours to obtain a transparent solution;

[0033] 3) Mix the weighed poly(3,4-ethylenedithiothiophene) with the mixed solvent in 1) at a mass fraction of 20%, and stir on a magnetic stirrer at 65° C. for 2 hours to obtain a transparent solution;

[0034] 4) Mix the two solutions in 2) and 3) evenly to make a spinning solution, use a syringe with a specification of 10ml, extract the spinning solution, and perform electrospinning at room temperature. The spinning conditions are: humidity: 50% Spinning voltage: 20KV, receiving distance: 25cm, advancing speed: 0.5ml / h. After 45 minutes, a poly(3,4-ethylenedithiothiophene)-sulfur nanofiber membrane polymer ...

example 3

[0036] 1) Dichloromethane and tetrahydrofuran are formulated into a mixed solvent at a mass ratio of 1:3, and poly(3,4-ethylenedithiothiophene) and elemental sulfur are weighed at a mass ratio of 40:60;

[0037] 2) Mix the weighed sulfur with the mixed solvent in 1) at a mass fraction of 15%, and stir on a magnetic stirrer at 65° C. for 2 hours to obtain a transparent solution;

[0038] 3) Mix the weighed poly(3,4-ethylenedithiothiophene) with the mixed solvent in 1) at a mass fraction of 15%, and stir on a magnetic stirrer at 65° C. for 2 hours to obtain a transparent solution;

[0039] 4) Mix the two solutions in 2) and 3) evenly to make a spinning solution, use a syringe with a specification of 10ml, extract the spinning solution, and perform electrospinning at room temperature, the spinning condition is: humidity: 60% Spinning voltage: 25KV, receiving distance: 30cm, advancing speed: 3ml / h. After 60 minutes, a poly(3,4-ethylenedithiothiophene)-sulfur nanofiber membrane po...

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Abstract

The invention relates to a lithium-sulfur battery high-molecular composite cathode material and a preparation method. The material is prepared from the following components in percentages by weight: 60% to 85% of elemental sulfur and 15% to 40% of poly (3,4-ethylene dithio-thiofuran); the poly (3,4-ethylene dithio-thiofuran) is taken as a main fiber-forming polymer, and the elemental sulfur is uniformly dispersed in a spinning solution of the poly (3,4-ethylene dithio-thiofuran) so as to realize molecular dispersion by using the characteristic that the elemental sulfur is dissoluble in organic solvents such as carbon disulfide and carbon tetrachloride; and then nanofiber is prepared by using an electrospinning technique. In the nanofiber, the elemental sulfur as a cathode active material is uniformly distributed in the fiber, the poly (3,4-ethylene dithio-thiofuran) as carrier-clad sulfur can inhibit the dissolution of a polysulfide generated in an electrochemical process, and meanwhile an electron conveying passage is provided, so that the cycle performance of a lithium-sulfur battery can be obviously improved. The material is low in equipment requirement and simple in preparation technology, and is beneficial for industrial production.

Description

technical field [0001] The invention belongs to the field of batteries, and in particular relates to a preparation method of a lithium-sulfur battery polymer composite cathode material. Background technique [0002] In order to meet the increasing demand for energy consumption in the current society, more renewable energy is needed to supplement or replace the use of petroleum-based energy. However, renewable energy in nature, such as solar energy, wind energy, tidal energy, etc., is discontinuous, so an energy storage device is required to store energy for use when needed. Rechargeable batteries are considered to be one of the most promising energy storage devices for solving the problems associated with replacing fossil fuels with renewable energy. Lithium batteries have so far been the main field of modern application of lithium source composite materials. The lithium-sulfur battery is considered to be the most promising lithium battery system. However, due to the insu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052B82Y30/00
CPCB82Y30/00H01M4/366H01M4/38H01M4/624H01M4/628H01M10/052Y02E60/10
Inventor 封伟赵付来冯弈钰李瑀
Owner TIANJIN UNIV