A kind of lithium-sulfur battery cathode carrier material and preparation method thereof

A lithium-sulfur battery and carrier material technology, applied in battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve problems such as large size, poor battery cycle performance, and low active material utilization.

Active Publication Date: 2020-12-01
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although lithium-sulfur batteries have so many advantages, the commercialization process of lithium-sulfur batteries is still hindered by some factors: first, the electronic conductivity of elemental sulfur and its discharge products is low, resulting in the performance of lithium-sulfur batteries during charge and discharge. Poor electrochemical activity and low active material utilization
Second, the intermediate polysulfides produced during the discharge process are easily dissolved in the organic electrolyte, resulting in a "shuttle effect", resulting in poor cycle performance of the battery
Third, the slow redox kinetics in the conversion process between different active materials leads to poor rate performance of the battery
However, most metal sulfides will agglomerate to varying degrees during the preparation process, resulting in larger and irregular particles
Large-sized metal sulfide particles greatly reduce the effective contact area for adsorption and catalysis of polysulfides

Method used

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  • A kind of lithium-sulfur battery cathode carrier material and preparation method thereof
  • A kind of lithium-sulfur battery cathode carrier material and preparation method thereof
  • A kind of lithium-sulfur battery cathode carrier material and preparation method thereof

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preparation example Construction

[0033] (4) Preparation of positive electrode materials for lithium-sulfur batteries: mix the materials prepared in Examples and Comparative Examples with sulfur elemental substance at a mass ratio of 1:4, and ball mill for 30 minutes to obtain the mixture, and then transfer the mixture to polystyrene in an argon atmosphere. Seal the reactor in vinyl fluoride, and heat the reactor at 155°C for 24 hours in a muffle furnace. Finally, it was naturally cooled to room temperature to obtain the cathode material for lithium-sulfur batteries.

[0034] (5) Assembly of the battery: the positive electrode material of the lithium-sulfur battery is used as the positive electrode; the lithium sheet is used as the negative electrode; the electrolyte solvent is 1,3-dioxolane (DOL) and ethylene glycol dimethyl ether (DME), and the volume The ratio is 1:1, the solute is 1mol / L lithium bistrifluoromethanesulfonate imide (LiTFSI), 0.2mol / L lithium nitrate (LiNO 3 ); the diaphragm adopts the polyp...

Embodiment 1

[0038] At room temperature, 200 mg of polyvinylpyrrolidone was dissolved in 40 mL of methanol solution, 2 mL of graphene oxide aqueous solution (10 mg / ml) was added to the above solution, and ultrasonically dispersed for 2 hours to obtain mixed solution 1. 1.19g Zn(NO 3 ) 2 ·6H 2 O and 0.58g Co(NO 3 ) 2 ·6H 2 O was dissolved in mixed solution 1 and stirred at room temperature for 3 h to obtain mixed solution 2. Then the methanol solution of 40mL 2-methylimidazole (1.97g) was quickly added to the mixed solution 2, stirred at room temperature for 30min until the purple-black precipitate was produced and then centrifuged, and the gained purple-black precipitate was washed 3 times with anhydrous methanol to remove impurities. Then it was washed twice with deionized water, and the obtained purple-black precipitate was freeze-dried in a freeze dryer for 48 hours to obtain intermediate product 1. The intermediate product 1 was calcined in an argon atmosphere tube furnace at 900...

Embodiment 2

[0048] At room temperature, 200 mg of polyvinylpyrrolidone was dissolved in 40 mL of methanol solution, 2 mL of graphene oxide aqueous solution (10 mg / ml) was added to the above solution, and ultrasonically dispersed for 2 hours to obtain mixed solution 1. 0.89g Zn(NO 3 ) 2 ·6H 2 O and 0.87g Co(NO 3 ) 2 ·6H 2 O was dissolved in mixed solution 1 and stirred at room temperature for 3 h to obtain mixed solution 2. Then the methanol solution of 40mL 2-methylimidazole (1.97g) was quickly added to the mixed solution 2, stirred at room temperature for 30min until the purple-black precipitate was produced and then centrifuged, and the gained purple-black precipitate was washed 3 times with anhydrous methanol to remove impurities. Then it was washed twice with deionized water, and the obtained purple-black precipitate was freeze-dried in a freeze dryer for 48 hours to obtain intermediate product 1. The intermediate product 1 was calcined in an argon atmosphere tube furnace at 900...

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Abstract

The invention relates to a sulfur lithium battery positive carrier material and a preparation method thereof, and belongs to the technical field of battery materials. The material consists of multilayer porous carbon plates and CoS2 nanoparticles; the multilayer porous carbon plates are assembled and formed by carbon nanoplate units layer by layer, and porous carbon derived by a metal organic frame material in the carbon nanoplate units is compactly grown on two surfaces of reduction-oxidation graphene; the CoS2 nanoparticles are embedded in the porous carbon plates, and the grain diameters ofthe CoS2 nanoparticles are 5 to 35 nm. The sulfur lithium battery positive carrier material has larger specific surface area and abundant porous structures, polysulfides can be adsorbed physically, the volume expansion of polysulfides is retarded effectively, and rapid transport of ions and electrons can be promoted; and the method is simple and practicable.

Description

technical field [0001] The invention relates to a lithium-sulfur battery cathode carrier material and a preparation method thereof, belonging to the technical field of battery materials. Background technique [0002] The gradual depletion of fossil fuels and increasingly severe environmental problems are urgent problems to be solved. Lithium-ion batteries have the advantages of environmental friendliness, high energy density, and good cycle stability. Since their commercialization in the 1990s, they have been used in portable mobile power supplies, electric vehicles, and energy storage power stations. However, with the rapid development of current mobile products, the existing lithium-ion batteries are limited by their theoretical capacity, making it difficult to meet the needs of the current society. Therefore, it is particularly important to develop new lithium secondary batteries with high energy density. In recent years, lithium-sulfur batteries have received extensive...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M10/052
CPCY02E60/10
Inventor 陈人杰李万隆钱骥李丽吴锋
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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