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Materials with core-shell structure, its preparation method and application

A core-shell structure and composite material technology, applied in the field of electrochemistry, can solve the problems of electrolyte entry and polysulfide ion dissolution contradiction, complex process, poor repeatability, etc. Effect

Active Publication Date: 2019-12-06
SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, the cases that have been successfully implemented include: Yang Yuan et al. prepared PEDOT:PSS-wrapped carbon-sulfur cathode materials by ultrasonic coating. Solvent, to obtain carbon-sulfur materials with about 10nm polymer coating on the surface, the method is simple and effective, and the finished product is of high purity, but the cost is high and the repeatability is poor; Carbon coating to further limit the dissolution of polysulfide ions
However, the conditions of this method are harsh and the process is complicated; other coating methods are also similar
However, although a variety of coating strategies have been successfully applied to the preparation of lithium-sulfur battery cathode materials, there is a logical contradiction in these pre-coating strategies, that is, the contradiction between electrolyte entry and polysulfide ion dissolution.

Method used

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  • Materials with core-shell structure, its preparation method and application
  • Materials with core-shell structure, its preparation method and application
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preparation example Construction

[0037] Further, the preparation method includes: after uniformly mixing the mesoporous carbon material and elemental sulfur powder, heating at 100-200°C for 12-24 hours to form a carbon-sulfur composite material, and then mixing with polymer monomers and The initiator and / or polymer are thoroughly mixed in a solvent to produce the polymer-coated core.

[0038] Among them, typical polymers can be selected from polyacrylonitrile, polyvinyl chloride, polystyrene and other substances that can undergo dehydrogenation reaction with elemental sulfur. Correspondingly, typical initiators can be selected from radical initiators such as azobisisobutyronitrile (AIBN), potassium persulfate, and the like.

[0039] Another aspect of the embodiments of the present invention also provides the use of the aforementioned core-shell structure materials in the preparation of lithium-sulfur batteries.

[0040] Another aspect of the embodiments of the present invention also provides a lithium-sulfur...

Embodiment 1

[0050] Mix 3 g of commercially available sulfur powder and 7 g of mesoporous carbon material (commercial mesoporous carbon material, its pore size distribution is 2-5 nm, and the pore volume is about 1.0 cm 3 / g) mix evenly, and heat at 100-200° C. for 12-24 hours to obtain a carbon-sulfur composite material. Then add 0.5g of carbon-sulfur composite material into 50ml of ethanol, and stir to disperse to obtain a mixed solution. Under strong stirring, 10ml of acrylonitrile monomer and 75mg of azobisisobutyronitrile (AIBN) were sequentially added to the aforementioned mixed solution, sealed, and polymerized at 65° C. for 3 hours under a nitrogen atmosphere. The obtained product is successively centrifuged, washed and dried to prepare polyacrylonitrile-coated carbon-sulfur material. Mix 100 mg of the prepared polyacrylonitrile-coated carbon-sulfur material with 300 mg of elemental sulfur, and calcinate at 300 ° C for 6 h under the protection of argon to form an organic sulfur-co...

Embodiment 2

[0056] Mix 3 g of commercially available sulfur powder and 7 g of mesoporous carbon material (commercial mesoporous carbon material, its pore size distribution is 2-5 nm, and the pore volume is about 1.0 cm 3 / g) mix evenly, and heat at 100-200° C. for 12-24 hours to obtain a carbon-sulfur composite material. Then, the above-mentioned carbon-sulfur composite material was added to the dimethyl sulfoxide solution containing polyacrylonitrile under the action of strong stirring, ultrasonicated for 1 hour, and then heated to volatilize the solvent dimethyl sulfoxide to obtain a polyacrylonitrile-coated carbon-sulfur materials. Mix 100 mg of the prepared polyacrylonitrile-coated carbon-sulfur material with 100 mg of elemental sulfur, and calcinate at 300 ° C for 6 h under the protection of argon to form an organic sulfur-coated carbon-sulfur composite material (that is, a material with a core-shell structure) ).

[0057] The organic sulfur-coated carbon-sulfur composite material ...

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Abstract

The invention discloses a material with a core-shell structure, a preparation method and an application thereof. The material of the core-shell structure includes a core comprising elemental sulfur and a shell covering the core, the shell comprising sulfur-containing organics capable of reacting with selected species to form on the shell To form an in-situ coating layer, the selected substance is selected from substances capable of nucleophilic or electrophilic reaction with the sulfur-containing organic compound. The core-shell structure material of the present invention can be used as a lithium-sulfur battery cathode material, and the preparation process is simple, the efficiency is high, the conditions are mild, the equipment is simple, and it is suitable for large-scale industrial application. The sulfur-containing organic matter in the core-shell structure material of the present invention can chemically react with the lithium-sulfur electrolyte additive to form an in-situ coating layer, thereby inhibiting the stripping and shuttling of polysulfide ions. The lithium-sulfur battery based on the core-shell structure material of the present invention has high discharge capacity and excellent cycle stability.

Description

technical field [0001] The invention specifically relates to a core-shell structure organic sulfur-coated elemental sulfur composite material, a preparation method thereof and an application in a lithium-sulfur battery, belonging to the technical field of electrochemistry. Background technique [0002] With the increasing shortage of traditional resources and energy and the increasingly serious environmental problems, the development of new energy storage and conversion technologies has become the focus of energy strategies of various countries. Among them, lithium-sulfur batteries are high-energy-density secondary batteries with great development potential and application prospects. It uses sulfur as the main positive electrode active material, with high specific capacity (1675mAh / g) and high energy density (2600Wh / kg), the actual energy density has reached 400Wh / kg, and sulfur is cheap and non-toxic. Therefore, lithium-sulfur batteries are attracting increasing attention....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/62H01M10/0525
CPCH01M4/38H01M4/628H01M10/0525Y02E60/10
Inventor 胡晨吉陈宏伟卢威吴晓东陈立桅
Owner SUZHOU INST OF NANO TECH & NANO BIONICS CHINESE ACEDEMY OF SCI
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