Method for preparing lithium sulfur battery positive electrode

A production method and technology for lithium-sulfur batteries, which are applied in electrode manufacturing, battery electrodes, circuits, etc., can solve the problems of capacity loss, accelerated capacity decay, and small proportion.

Active Publication Date: 2016-03-30
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, during the research process, lithium-sulfur batteries also have some problems to be solved, among which the most daring obstacle to its practical application is the dissolution of sulfur
The intermediate products of sulfur reduction are soluble in the electrolyte, which will inevitably lead to the loss of capacity. Polysulfides will always maintain a certain concentration in the electrolyte, but the loss of this part of the sulfur active material is fixed, and the proportion of The proportion is also small; the intermediate products dissolved in the electrolyte will shuttle to the negative electrode to directly react with metal lithium, resulting in high battery self-discharge rate, poor shelf performance and low Coulombic efficiency; in addition, the most serious impact, shuttle to the negative electrode The intermediate product will undergo an irreversible chemical reaction and deposit on the surface of the lithium metal negative electrode, resulting in a decrease in the active reaction interface and accelerated capacity fading

Method used

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  • Method for preparing lithium sulfur battery positive electrode
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Examples

Experimental program
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Effect test

Embodiment 1

[0024] Slurry A: Weigh the carbon-sulfur compound (sulfur content 70%), conductive agent KB600 and binder PVP according to the ratio of 70:10:20, first put the weighed carbon-sulfur compound and conductive agent into the dispersion Add isopropanol (according to the amount of isopropanol weighed according to the solid content of the slurry at 3%), sonicate for 120 minutes to disperse and mix the two evenly; then add PVP (molecular weight ~ 50W), and continue to sonicate for 30 minutes.

[0025] Slurry B: Weigh the carbon-sulfur compound (sulfur content 70%), conductive agent KB600 and binder Nafion according to the ratio of 70:10:20, first put the weighed carbon-sulfur compound and conductive agent into the dispersion Add isopropanol (according to the amount of isopropanol weighed according to the solid content of the slurry at 3%), sonicate for 120 minutes to disperse and mix the two evenly; then add Nafion (EW1100), and continue to sonicate for 30 minutes. (Wherein, EW refers...

Embodiment 2

[0028] Slurry A: Weigh the carbon-sulfur compound (sulfur content 70%), conductive agent KB600 and binder PVP according to the ratio of 80:10:10, first put the weighed carbon-sulfur compound and conductive agent into the dispersion Add isopropanol (according to the amount of isopropanol weighed according to the solid content of the slurry at 3%), sonicate for 120 minutes to disperse and mix the two evenly; then add PVP (molecular weight ~ 50W), and continue to sonicate for 30 minutes.

[0029] Slurry B: Weigh the carbon-sulfur compound (sulfur content 70%), conductive agent KB600 and binder Nafion according to the ratio of 80:10:10, first put the weighed carbon-sulfur compound and conductive agent into the dispersion Add isopropanol (according to the amount of isopropanol weighed according to the solid content of the slurry at 3%), sonicate for 120 minutes to disperse and mix the two evenly; then add Nafion (EW1100), and continue to sonicate for 30 minutes.

[0030] The above ...

Embodiment 3

[0032] Slurry A: Weigh the carbon-sulfur compound (sulfur content 70%), conductive agent KB600 and binder PVP according to the ratio of 70:10:20, first put the weighed carbon-sulfur compound and conductive agent into the dispersion Add isopropanol (according to the amount of isopropanol weighed according to the solid content of the slurry at 3%), sonicate for 120 minutes to disperse and mix the two evenly; then add chitosan oligosaccharide (molecular weight ~ 50W), and continue to sonicate for 30 minutes.

[0033] Slurry B: Weigh the carbon-sulfur compound (sulfur content 70%), conductive agent KB600 and binder Nafion according to the ratio of 70:10:20, first put the weighed carbon-sulfur compound and conductive agent into the dispersion In the isopropanol (according to the amount of isopropanol weighed according to the solid content of the slurry at 3%), ultrasonic for 120min to disperse and mix the two evenly; then add sulfonated polyether ether ketone (sulfonated degree 80%)...

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Abstract

A method for preparing a lithium sulfur battery positive electrode is provided; two or more than two macromolecules with different charges are screened as electrode adhesives, and a current collector is coated with slurries with different adhesives in a layer-by-layer crossing manner to prepare the electrode. The method can well control or slow down diffusion of polysulfide ions to a bulk electrolyte solution, can play a role of effective sulfur fixation, and makes electrode internal ohmic resistance and contact internal resistance reduced to a certain extent. Furthermore, due to ion charges introduced in the adhesives, the transmission of lithium ions in the electrolyte solution can be promoted.

Description

technical field [0001] The invention relates to the field of lithium-sulfur batteries, in particular to a method for preparing a positive electrode of a lithium-sulfur battery. Background technique [0002] With the shortage of fossil energy sources, people's demand for chemical power sources is increasing and their requirements are getting higher and higher. On the big side, the environmental pollution caused by fuel vehicles and the high price of fuel make people's expectations for cost-effective electric vehicles gradually increase. The driving range of fuel vehicles is 500km, which requires the energy density of the vehicle battery to reach 550Wh / kg, while the energy density of lithium-ion power batteries currently being promoted is only about 200Wh / kg, it is difficult to reach the current level of fuel vehicles; on the small side, in recent years, portable electronic devices such as mobile phones, notebook computers, tablet computers, etc. have been widely used The po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/139
CPCY02E60/10
Inventor 王倩张华民张洪章
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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