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Preparation method of sulfur electrode using in-situ polymerization of pyrrole monomer

An in-situ polymerization, pyrrole monomer technology, applied in the direction of positive electrode, battery electrode, active material electrode, etc., can solve the problems of high conductivity of porous carbon materials, poor conductivity of sulfur electrodes, and capacity decline of lithium-sulfur batteries, etc. Achieve the effect of being beneficial to mass production, improving cycle life, and improving high-rate discharge performance

Inactive Publication Date: 2017-04-12
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the biggest problem of lithium-sulfur batteries is that lithium polysulfide dissolved in the electrolyte is formed during charging and discharging, and the dissolved lithium polysulfide reacts with lithium metal in the negative electrode, causing capacity loss, which leads to a rapid decline in the capacity of lithium-sulfur batteries, showing extreme poor cycle life
In the process of sulfur loading, it is inevitable that elemental sulfur is adsorbed on the outer surface of porous carbon particles, resulting in an increase in the interparticle resistance and making the conductivity of the sulfur electrode worse. The electrode thus prepared shows a large impedance, which seriously affects the porous carbon The performance of the material's high conductivity

Method used

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  • Preparation method of sulfur electrode using in-situ polymerization of pyrrole monomer
  • Preparation method of sulfur electrode using in-situ polymerization of pyrrole monomer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment one: sucrose thiourea prepolymerization

[0028] 10 g of sucrose was heated to 80° C. and dissolved in 10 wt % dilute sulfuric acid (10 mL), and 2 g of thiourea was heated to 40° C. and dissolved in 4 mL of deionized water. The thiourea solution was added into the sucrose solution, the mass ratio of sucrose to thiourea was 1:0.2, the mixed solution was placed in a water bath at 90° C., and fully stirred. After reacting for 45 minutes, the viscosity of the liquid increased significantly, and a sucrose thiourea prepolymer was obtained.

Embodiment 2

[0029] Embodiment two: preparation of sucrose thiourea prepolymer solution

[0030] 10 g of sucrose was heated to 80° C. and dissolved in 10 wt % dilute sulfuric acid (10 mL), and 5 g of thiourea was heated to 40° C. and dissolved in 6 mL of deionized water. The thiourea solution was added into the sucrose solution, the mass ratio of sucrose to thiourea was 1:0.5, the mixed solution was placed in a water bath at 90°C, and fully stirred. After reacting for 45 minutes, the viscosity of the liquid increased significantly, and the color changed from colorless to light yellow to orange-red, and 40 mL of deionized water was added to terminate the polymerization, and cooled to obtain a sucrose thiourea prepolymer solution.

Embodiment 3

[0031] Example 3: Preparation of macroporous carbon precursor

[0032] 10 g of sucrose was heated to 80° C. and dissolved in 10 wt % dilute sulfuric acid (10 mL), and 10 g of thiourea was heated to 40° C. and dissolved in 10 mL of deionized water. Add the thiourea solution into the sucrose solution, the mass ratio of sucrose to thiourea is 1:1, put the mixed solution in a water bath at 90°C, and stir thoroughly. After reacting for 45 minutes, the viscosity of the liquid increased significantly, and the color changed from colorless to light yellow to orange-red, and 40 mL of deionized water was added to terminate the polymerization, and cooled to obtain a sucrose thiourea prepolymer solution.

[0033] Take another beaker and put nano-CaCO 3 5g of the powder was evenly dispersed in 30mL of deionized water to obtain a suspension, which was added to the sucrose thiourea prepolymer solution, heated in a water bath at 85°C, stirred and reacted for 50 minutes, and then spray-dried t...

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Abstract

The invention relates to the field of batteries and aims to provide a sulfur electrode preparation method by in-situ polymerization of a pyrrole monomer. The sulfur electrode preparation method includes the steps of adding a thiourea solution into a sucrose solution for reaction to obtain a sucrose and thiourea prepolymer solution, adding turbid liquid containing nanometer CaCO3, heating for reaction, and performing spray drying to obtain a macropore carbon precursor; in the presence of nitrogen, performing high-temperature polymerization, carbonization, cooling, ball milling, template removing, washing and drying to obtain sulfur nitrogen contained micropore carbon; mechanically mixing the sulfur nitrogen contained micropore carbon with elemental sulfur, heating for reaction to finish sulfur carrying and cooling to obtain a sulfur nitrogen contained macropore carbon sulfur-carrying material; grinding with pyrrole in the absence of light, adding a dispersing agent, mixing into paste, coating the paste on an aluminum membrane, and heating in the air to obtain a sulfur electrode. The sulfur electrode preparation method has the advantages that by the aid of the sulfur electrode, cycle life of a lithium sulfur battery can be prolonged, and high-rate discharging performance of the sulfur battery can be improved; raw materials for the sulfur electrode are rich in resource, low in cost and pollution-free, so that the sulfur electrode is low in raw material cost; the sulfur electrode preparation method is simple in technology, easy to implement, beneficial to large-scale production, capable of lowering battery cost and wide in application prospect.

Description

technical field [0001] The invention relates to the field of batteries, and relates to a new method of using sulfur- and nitrogen-containing macroporous carbon as a sulfur-carrying material and its synthesis. Sulfur and nitrogen macroporous carbon as sulfur-carrying material particles with high conductivity and long cycle life sulfur electrode protected by lithium ion perfluorosulfonic acid resin and its preparation method. Background technique [0002] Lithium-sulfur battery is a kind of lithium-ion battery. Sulfur is used as the positive electrode material of the battery. It has the advantages of light weight, large capacity, and no memory effect. The specific energy of lithium-sulfur batteries is much higher than that of commercially widely used lithium-ion batteries. Moreover, sulfur is an environmentally friendly element that basically has no pollution to the environment. Lithium-sulfur batteries are a very promising lithium-ion battery. [0003] Lithium-sulfur batte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/139H01M4/62
CPCH01M4/139H01M4/62H01M2004/028H01M2220/10Y02E60/10
Inventor 刘宾虹李洲鹏
Owner ZHEJIANG UNIV
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