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Method for testing shuttle effect of accelerated polysulfide

A shuttle effect, polysulfide technology, applied in the field of lithium-sulfur battery separator and electrochemistry, can solve the problems of cumbersome, complex, acceleration, etc., to achieve the effect of accelerated shuttle effect, simple steps, and safe operation

Inactive Publication Date: 2018-11-20
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the relatively cumbersome and complicated shortcomings of the prior art, and provides a test method for accelerating the "shuttle effect" of polysulfides

Method used

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  • Method for testing shuttle effect of accelerated polysulfide
  • Method for testing shuttle effect of accelerated polysulfide
  • Method for testing shuttle effect of accelerated polysulfide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Sodium polysulfide aqueous solution and Na 2 SO 4 Aqueous solution equipment:

[0026] Na 2 S+xS=Na 2 S (x+1) , from this reaction equation we can know that by controlling Na 2 The molar ratio of S to elemental sulfur to obtain different polysulfides, expressed as Na 2 S 6 For example, at this time Na 2 The molar ratio of S to S is 1:5. Add 300mL of deionized water into a 500mL three-necked flask, feed nitrogen, and weigh Na 2 S.9H 2 O (12g, 0.05mol) was then added, stirred at room temperature until Na 2 S.9H 2 O is completely dissolved; then the temperature is raised to 50 degrees, and S (8g, 0.25mol) is added under the protection of nitrogen, dissolved and stirred until it is completely dissolved, cooled to room temperature, and the solution at this time is 1mol / L Na 2 S 6 aqueous solution.

[0027] Weigh Na 2 SO 4 (28.404g, 0.2mol), join in the beaker of 500mL, add the deionized water of 200mL subsequently, stir until the solid substance dissolves...

Embodiment 2

[0032] (1) Sodium polysulfide aqueous solution and Na 2 SO 4 The equipment of aqueous solution: consistent as in embodiment one

[0033] (2) Construction of electrolysis device

[0034] Buy a U-shaped electrolytic cell online, separate the positive and negative electrodes with a modified PP diaphragm in the middle, and fix them with clips to prevent the electrolyte from flowing out. Add 1mol / L Na to the left 2 S 6 The aqueous solution is used as the negative electrode, the liquid level needs to be higher than the height of the diaphragm, and 1mol / L Na is added to the right 2 SO 4 The aqueous solution is used as the positive electrode, and the liquid level also needs to be higher than the height of the diaphragm.

[0035] Apply a constant voltage of 30V to the battery, and monitor the change of its current value at any time. The polysulfide ions will pass through the diaphragm to the positive electrode, so that the electrolytic cell on the right side will turn yellow, and ...

Embodiment 3

[0037] (1) Sodium polysulfide aqueous solution and Na 2 SO 4 The equipment of aqueous solution: consistent as in embodiment one

[0038] (2) Construction of the electrolysis device:

[0039] Buy a U-shaped electrolyzer online, separate the positive and negative electrodes with a PP diaphragm in the middle, and fix them with clips to prevent the electrolyte from flowing out. Add 1mol / L Na to the left 2 S 6 The aqueous solution is used as the negative electrode, the liquid level needs to be higher than the height of the diaphragm, and 1mol / LNa is added to the right 2 SO 4 The aqueous solution is used as the positive electrode, and the liquid level also needs to be higher than the height of the diaphragm.

[0040] Apply a constant voltage of 10V to the battery, and monitor the change of its current value at any time. The polysulfide ions will pass through the diaphragm to the positive electrode, so that the electrolytic cell on the right side will turn yellow, and at the sam...

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Abstract

The invention relates to the field of lithium-sulfur battery diaphragms and electrochemistry and discloses a method for testing a shuttle effect of accelerated polysulfide so as to realize a more visual, simple and quantitative observation method. The method for testing the shuttle effect of the accelerated polysulfide mainly comprises two steps: firstly, preparing a sodium polysulfide aqueous solution and a sodium sulfate aqueous solution with equivalent concentrations, secondly, correspondingly filling the prepared sodium polysulfide aqueous solution and the prepared sodium sulfate aqueous solution into a U-shaped electrolytic tank as electrolytes of a cathode and an anode, and using a commercialized diaphragm of a lithium-sulfur battery between the sodium polysulfide aqueous solution and the sodium sulfate aqueous solution to carry out electrophoresis under a constant voltage. The method for testing the shuttle effect of the accelerated polysulfide has the advantages that the test does not need to be carried out in a sealed device such as a glove box and can be operated under any condition on one hand; and on the other hand, except for being able to observe the color change likea traditional method, the method for testing the shuttle effect of the accelerated polysulfide can also observe the change of a current value to know the number of polysulfur ions which shuttling from the cathode to the anode. The invention provides the method for testing the shuttle effect of the accelerated polysulfide; the method for testing the shuttle effect of the accelerated polysulfide, provided by the invention, has the advantages of simple steps, safety operation, low production cost, environment friendliness and extremely broad application prospect.

Description

Technical field: [0001] The invention relates to the field of lithium-sulfur battery diaphragm and electrochemistry, in particular to a test method for accelerating the "shuttle effect" of polysulfides. Background technique: [0002] In recent years, the rapid development of the economy and society has consumed a large amount of non-renewable energy and caused increasingly serious environmental problems, making it extremely urgent to develop new green and recyclable energy storage systems. At the same time, the current economic and social development has put forward new requirements for energy storage batteries, which need to have higher energy density and long cycle life. The theoretical specific capacity of lithium-sulfur battery is as high as 1675mAh.g -1 , energy density up to 2600Wh.g -1 , which is more than five times the energy density of current commercial lithium-ion batteries, and the advantages of low cost have attracted the attention of researchers. In additio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/447
CPCG01N27/447
Inventor 魏子栋李存璞董琴
Owner CHONGQING UNIV
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