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Carbon/sulfur composite positive material having long cycle life, and preparation method thereof

A composite cathode material, carbon-sulfur composite technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of unstable electrode structure, low discharge median voltage, low discharge specific capacity, etc. , Improve the effect of sulfur contact area and high discharge specific capacity

Inactive Publication Date: 2013-08-14
NO 63971 TROOPS PLA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is mainly to provide a carbon / sulfur composite positive electrode material with high specific capacity and long cycle life for the problems of low discharge specific capacity and poor cycle stability or low discharge median voltage and unstable electrode structure. Grafted nano-carbon fiber / sulfur composite cathode material and preparation method thereof

Method used

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  • Carbon/sulfur composite positive material having long cycle life, and preparation method thereof
  • Carbon/sulfur composite positive material having long cycle life, and preparation method thereof

Examples

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Effect test

example 1

[0032] Put 15g of multi-walled carbon nanofibers in a 1000ml three-neck round bottom flask filled with 600mL H 2 SO 4 / HNO 3 (volume ratio is 3: 1) in the mixed acid, ultrasonic 30min, water-bath heating and reflux 8h, vacuum suction filtration, wash repeatedly with deionized water until PH>5, put filtrate in vacuum oven and dry, obtain Oxidized carbon nanofibers. Then take 10g of oxidized nano-carbon fiber and add it to 250mL of acetone solvent, and disperse it with a high-speed disperser for 30 minutes; take another beaker, then add 20g of propylene oxide, 150mL of acetone, and disperse at a high speed for 10 minutes; mix the two together, and pour them into three round bottoms The flask was stirred and heated to 150°C, and the catalyst was added to react for 6 hours. The reactants were washed with dichloromethane, filtered, and the filtrate was dried in a vacuum oven to obtain grafted carbon nanofibers.

example 2

[0034] Prepare c(K 2 Cr 2 o 7 )=0.25mol / L, c(H + ) = 1mol / L mixed solution 500mL into a 1000mL three-neck flask, add 15g of multi-walled carbon nanofibers, ultrasonically disperse for 30min, stir mechanically at a high speed at 80°C for 4h, cool, and rinse repeatedly with a large amount of deionized water until the filtrate is neutral. Put the product in a vacuum drying oven at 80°C for 24 hours and then grind it.

[0035] Weigh a certain amount of oxidized nano-carbon fiber and N,N dihydroxyethyl-3-aminomethyl acrylate into a three-necked flask, add p-toluenesulfonic acid with a mass fraction of 1% as a catalyst, and ultrasonically disperse for 30 minutes after adding acetone. After stirring mechanically at 60°C to completely volatilize acetone, at a certain temperature and N 2 Stir mechanically under air protection for 4-12 hours. After the reaction is completed, the product is washed repeatedly with chloroform, centrifuged until no longer containing hyperbranched poly(...

example 3

[0037] Put 15g of multi-walled carbon nanofibers in a 1000ml three-neck round bottom flask filled with 600mL H 2 SO 4 / HNO 3(volume ratio is 3: 1) in the mixed acid, ultrasonic 30min, water-bath heating and reflux 8h, vacuum suction filtration, wash repeatedly with deionized water until PH>5, put filtrate in vacuum oven and dry, obtain Oxidized carbon nanofibers. Then take 10g of oxidized nano-carbon fiber and add it to 250mL of acetone solvent, and disperse it with a high-speed disperser for 30 minutes; take another beaker, then add 100g of methoxytetraethylene glycol, 150mL of acetone, and disperse it at a high speed for 30 minutes; mix the two together, pour into The three-neck round bottom flask was stirred and heated to 150°C, and the catalyst was added to react for 24 hours. The reactant was washed with acetone, filtered, extracted with reflux of acetone, dried in a vacuum oven at 60° C. for 12 hours, and ground to obtain grafted carbon nanofibers.

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Abstract

A grafted carbon nanofiber / sulfur composite material having a high specific capacity and a long cycle life and applied in a lithium sulfur battery is obtained through carrying out melt compounding of grafted carbon nanofibers having an outstanding conductive performance and a network structure and elemental sulfur at a reaction temperature of 110-380DEG C for 2-60h, and the mass content of sulfur in the composite material is 40-85%. The initial discharge specific capacity of the composite positive electrode material is 1186mAh / g, and the discharge specific capacity of the composite positive electrode material after 50-time cycle still maintains 948mAh / g, so the composite positive electrode material has a good cycle stability.

Description

technical field [0001] The invention relates to a grafted nano-carbon fiber sulfur composite material with high specific capacity and long cycle life, relates to a carbon-sulfur composite cathode material suitable for a secondary lithium-sulfur battery and a preparation method thereof, and belongs to the field of chemical power sources. Background technique [0002] For a long time, elemental sulfur and inorganic sulfides, organic disulfides, polyorganodisulfides, organic polysulfides, polysulfides, and carbon-sulfur polymers have attracted much attention as high-capacity cathode materials. A lot of research (FengX., He X., Pu W., etc. 2007, Ionics 13(5), pp.375-377: Trofimov, B.A., Myachina, GE, Rodionova, etc., TA.2008, Journal of Applied Polymer Science 107(2)pp.784-787), however, there are still many problems in the development of lithium-sulfur batteries. First, elemental sulfur and sulfides themselves are poor conductors of electricity. Elemental sulfur is a typical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58
CPCY02E60/12Y02E60/10
Inventor 苑克国王安邦苗力孝王维坤余仲宝邱景义
Owner NO 63971 TROOPS PLA
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