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Positive electrode material for flexible lithium-sulfur battery

A technology for lithium-sulfur batteries and cathode materials, which is applied in the field of electrochemical applications and can solve problems such as uneven loading of cathode sulfur

Active Publication Date: 2017-09-29
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The positive electrode material has the characteristics of flexibility, no binder and no current collector, the preparation method is simple and can effectively solve the problem of uneven sulfur loading on the positive electrode

Method used

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  • Positive electrode material for flexible lithium-sulfur battery
  • Positive electrode material for flexible lithium-sulfur battery
  • Positive electrode material for flexible lithium-sulfur battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] (1) Preparation of film

[0047] At room temperature, add 0.2 g of carbon nanotubes to 100 ml of Tris-HCl buffer solution with a pH value of 8.5 dissolved in 0.2 g of dopamine hydrochloride, stir magnetically for 8 h to mix evenly, and filter with a microporous membrane with an average pore size of 0.22 μm , to obtain a powder; grind the powder, PEDOT:PSS and DMSO in a mortar for 30 minutes and mix them evenly to obtain a slurry, which is coated on a silicon plate with a coating thickness of 150 μm, dried at room temperature for 24 hours, and used Rinse with deionized water to remove impurities and fall off from the substrate to obtain a negative film.

[0048] Wherein, the mass ratio of powder to PEDOT:PSS is 4:1, and the volume ratio of PEDOT:PSS to DMSO is 25:3.

[0049] (2) Sulfur loading

[0050]In a glove box filled with an argon atmosphere with a purity of 99%, dissolve 0.182g of sulfur elemental substance in 11.5ml of toluene, stir for 30min to fully dissolve ...

Embodiment 2

[0060] (1) Preparation of film

[0061] At room temperature, add 0.1 g of carbon nanotubes and 0.1 g of graphene into 100 ml of Tris-HCl buffer solution with a pH value of 8.5 dissolved in 0.2 g of dopamine hydrochloride, stir magnetically for 24 h and mix evenly. The pore filter membrane is suction-filtered to obtain the powder; the powder, PEDOT:PSS and DMSO are ground and mixed in a mortar for 30 minutes to obtain a slurry, and the slurry is coated on a silicon plate with a coating thickness of 150 μm. Dry for 24 hours, rinse with deionized water to remove impurities, and fall off from the substrate to obtain a negative film.

[0062] Wherein, the mass ratio of powder to PEDOT:PSS is 1:9, and the volume ratio of PEDOT:PSS to DMSO is 5:1.

[0063] (2) Sulfur loading

[0064] In a glove box filled with an argon atmosphere with a purity of 99%, dissolve 0.182g of sulfur elemental substance in 11.5ml of toluene, stir for 30min to dissolve and obtain a solution, absorb it with...

Embodiment 3

[0074] (1) Preparation of film

[0075] At room temperature, add 0.2 g of carbon nanotubes to 100 ml of Tris-HCl buffer solution with a pH of 7.5 dissolved in 0.2 g of dopamine hydrochloride, stir for 4 h to mix evenly, and filter with a microporous membrane with an average pore size of 0.22 μm , to obtain a powder; grind the powder, PEDOT:PSS and DMSO in a mortar for 30 minutes and mix them evenly to obtain a slurry, which is coated on a silicon plate with a coating thickness of 500 μm, dried at room temperature for 24 hours, and used Rinse with deionized water to remove impurities and fall off from the substrate to obtain a negative film.

[0076] Wherein, the mass ratio of powder to PEDOT:PSS is 1:9, and the volume ratio of PEDOT:PSS to DMSO is 25:1.

[0077] (2) Sulfur loading

[0078] In a glove box filled with an argon atmosphere with a purity of 99%, dissolve 0.182g of sulfur elemental substance in 11.5ml of toluene, stir for 30min to fully dissolve to obtain a soluti...

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Abstract

The invention relates to a positive electrode material for a flexible lithium-sulfur battery and belongs to the technical field of electrochemistry application. The positive electrode material is obtained through a method comprising the following steps: adding a carbon material to a dispersion liquid into which a polymer monomer is dissolved; adding an oxidant according to the condition, stirring and mixing evenly, and filtering to obtain powder; mixing the powder, a binder and a film-forming agent evenly, coating a substrate with the mixture, drying, washing off impurities by using a solvent 1, and stripping the mixture from the substrate to obtain a film; and dissolving elemental sulfur into a solvent 2 in an inert atmosphere, dropwise adding the solvent 2 to the film, and evaporating the solvent to obtain the positive electrode material. The positive electrode material can be self-supported, has flexibility and does not have a current collector; the positive electrode material can be used as a positive electrode of the lithium-sulfur battery in a monolithic or multi-layer stacking manner; the positive electrode material is capable of improving the utilization rate of active substance sulfur, effectively inhibiting dissolution of polysulfide, prolonging the cycle life of the lithium-sulfur battery and reducing the impedance of the lithium-sulfur battery; and the positive electrode material is simple in preparation method, low in cost, green and environment-friendly, and massive production is easy to achieve.

Description

technical field [0001] The invention relates to a flexible lithium-sulfur battery cathode material, which belongs to the technical field of electrochemical applications. Background technique [0002] Lithium-sulfur (Li-S) batteries have a high theoretical energy density (2600Wh kg -1 , 2800Wh L -1 ), and sulfur element is cheap and has little impact on the environment, so it has been favored by researchers. However, the actual energy density and cycle stability of Li-S batteries are limited by the low electronic and ionic conductivity of elemental sulfur; in addition, the large volume change of the positive electrode before and after the reaction of Li-S batteries easily leads to structural damage and failure, and eventually Causes intermediate sulfides to dissolve in the electrolyte. There are two deficiencies in the above problems, one is the low utilization rate of the active material, and the other is the poor stability of the interface. During the cycling of Li-S ba...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/58H01M4/62H01M10/052B82Y30/00
CPCB82Y30/00H01M4/362H01M4/38H01M4/5815H01M4/625H01M10/052Y02E60/10
Inventor 陈人杰刘玉婷叶玉胜吴锋曲薇杨天宇李丽
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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