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Preparation method for modified diaphragm for lithium-sulfur battery, modified diaphragm and lithium-sulfur battery adopting modified diaphragm

A lithium-sulfur battery and separator technology, applied in the field of lithium-sulfur batteries, can solve the problems of difficulty in further improving the utilization rate of sulfur, difficulty in solving the shuttle effect of polysulfides, high price, etc., so as to improve the capacity and cycle stability, and suppress the shuttle effect. , the effect of reducing battery costs

Inactive Publication Date: 2016-04-13
CHANGSHA RES INST OF MINING & METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The patent (CN104393220A) discloses a lithium-sulfur battery using a metal-organic framework material-based modified diaphragm, but the metal-organic framework material is expensive and the cost is high
Studies have shown that metal-organic framework materials only physically adsorb polysulfides, and it is difficult to fundamentally solve the "shuttle effect" of polysulfides
At the same time, in the above-mentioned lithium-sulfur battery in the prior art, the content of sulfur in the entire electrode sheet is low (less than 70%), and it is difficult to further improve the utilization rate of sulfur

Method used

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  • Preparation method for modified diaphragm for lithium-sulfur battery, modified diaphragm and lithium-sulfur battery adopting modified diaphragm
  • Preparation method for modified diaphragm for lithium-sulfur battery, modified diaphragm and lithium-sulfur battery adopting modified diaphragm
  • Preparation method for modified diaphragm for lithium-sulfur battery, modified diaphragm and lithium-sulfur battery adopting modified diaphragm

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Embodiment 1

[0036] A preparation method of a modified diaphragm for a lithium-sulfur battery of the present invention, a modified diaphragm and an embodiment of a lithium-sulfur battery having the modified diaphragm:

[0037] Modified diaphragm preparation: the prepared Mg 0.6 Ni 0.4 O nanoparticles and Ketjen Black (EC600JD) were mixed in a mass ratio of 1.5:1, and ball milled for 12 hours to obtain a uniformly mixed coating material; : 1 uniformly mixed, and dispersed in the N-methylpyrrolidone solvent, mechanically stirred for 12 hours to obtain a uniformly dispersed coating material; the uniformly dispersed slurry was coated on the polypropylene diaphragm surface (coated by a scraper coating method) operate as figure 1 shown), put the coated diaphragm into a vacuum drying oven, and dry it at 50°C for 6 hours to obtain a modified diaphragm (the appearance of the modified diaphragm is as follows figure 2 shown).

[0038] Battery assembly: the carbon / sulfur (mass ratio of carbon / sul...

Embodiment 2

[0043] A preparation method of a modified diaphragm for a lithium-sulfur battery of the present invention, a modified diaphragm and an embodiment of a lithium-sulfur battery having the modified diaphragm:

[0044] Modified diaphragm preparation: the prepared Mg 0.8 Cu 0.2 O nanoparticles and conductive carbon black (BP2000) were mixed in a mass ratio of 2:1, and ball milled for 12 hours to obtain a uniformly mixed coating material; 3:1 uniform mixing, and dispersed in N-methylpyrrolidone solvent, ultrasonic dispersion for 12 hours to obtain a uniformly dispersed coating material; use a doctor blade to coat the uniformly dispersed slurry on the surface of the polyacrylonitrile diaphragm, The coated separator was put into a vacuum drying oven, and dried at 50° C. for 12 hours to obtain a modified separator.

[0045] Battery assembly: the carbon / sulfur (mass ratio of carbon / sulfur is 1:4, the sulfur content accounts for 80% of the mass of the electrode sheet) composite material...

Embodiment 3

[0049] A preparation method of a modified diaphragm for a lithium-sulfur battery of the present invention, a modified diaphragm and an embodiment of a lithium-sulfur battery having the modified diaphragm:

[0050] Preparation of modified separator: the prepared TiO 2 Mix the nanoparticles and acetylene black at a mass ratio of 5:1, and ball mill for 12 hours to obtain a uniformly mixed coating material, then uniformly mix the uniformly mixed coating material with polyvinyl alcohol at a mass ratio of 4:1, and disperse into the acetone solvent, mechanically stirred for 12 hours to obtain a uniformly dispersed coating material; use a scraper to coat the uniformly dispersed slurry on the surface of the PTFE diaphragm, and put the coated diaphragm into a vacuum drying oven , dried at 50°C for 8 hours to prepare a modified separator.

[0051] Battery assembly: the carbon / sulfur (mass ratio of carbon / sulfur is 1:4, the sulfur content accounts for 80% of the mass of the electrode she...

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Abstract

The invention discloses a preparation method for a modified diaphragm for a lithium-sulfur battery, the modified diaphragm and the lithium-sulfur battery adopting the modified diaphragm. The preparation method for the modified diaphragm for the lithium-sulfur battery comprises the following steps of mixing a conductive agent with a nano-metal oxide at a mass ratio of 1:1-10:1 to obtain a uniformly-mixed coating material; uniformly mixing the coating material with a binder at a mass ratio of 1:1-5:1, and scattering the mixture into solvent; performing mechanical stirring or ultrasonic scattering to obtain uniformly-dispersed coating slurry; coating the surface of a diaphragm substrate with the obtained coating slurry, and performing vacuum drying to obtain the modified diaphragm for the lithium-sulfur battery. The modified diaphragm for the lithium-sulfur battery prepared by the method can effectively restrain a shuttle effect of polysulfide in a charge / discharge process of the lithium-sulfur battery and prolong the cycle life of the lithium-sulfur battery; and the lithium-sulfur battery adopting the modified diaphragm is high in capacity and good in cycling performance.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a preparation method of a modified diaphragm for a lithium-sulfur battery, a modified diaphragm and a lithium-sulfur battery with the modified diaphragm. Background technique [0002] Lithium-sulfur battery is a new type of chemical battery with metal lithium as the negative electrode and elemental sulfur or organic sulfide as the positive electrode. It is one of the batteries with high theoretical energy density. It has the advantages of abundant resources, non-toxicity, environmental friendliness, and low price. . However, lithium-sulfur batteries still face many challenges in the application process, the most serious of which is that the polysulfides produced during battery charging and discharging dissolve in the electrolyte, and the "shuttle effect" occurs, resulting in the loss of active materials and reducing the capacity of lithium-sulfur batteries. ...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M10/058H01M2/14H01M50/403H01M50/431H01M50/449
CPCH01M10/058H01M50/40H01M50/403H01M50/409Y02E60/10Y02P70/50
Inventor 姚山山唐豪沈湘黔吴潇侯金利钱昕晔饶德伟廖达前习小明覃事彪
Owner CHANGSHA RES INST OF MINING & METALLURGY
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