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Preparation method of composite anode material for lithium element sulphur secondary battery

A composite cathode material, sulfur secondary battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problem of unsolved conductivity of elemental sulfur electrodes, and achieve good application prospects, simple preparation methods, and uniform distribution. Effect

Inactive Publication Date: 2013-09-25
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the development of polymer and gel electrolytes, the use of pure solid-state electrolytes combined with special battery design technology can greatly inhibit the dissolution of discharge products, but the conductivity of the elemental sulfur electrode itself has not been resolved.

Method used

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  • Preparation method of composite anode material for lithium element sulphur secondary battery
  • Preparation method of composite anode material for lithium element sulphur secondary battery
  • Preparation method of composite anode material for lithium element sulphur secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh elemental sulfur (100 mesh, Aldrich) and thiophene monomer (analytical pure, Sinopharm Group) with a mass ratio of 30:70, and weigh anhydrous ferric chloride (chemically pure, Sinopharm Group) with a molar ratio of 1:4 . Put elemental sulfur and anhydrous ferric chloride into the reaction kettle, and add anhydrous chloroform until the solids are completely submerged. Control the temperature in the kettle at 0-10°C, and stir at a speed of 1000r / min for 30 minutes to mix the solids evenly. Put the quantitative monomer thiophene into the feeder and slowly and evenly add it to the reaction kettle. Keep stirring at a speed of 1000r / min and keep the temperature in the kettle at 0-10°C for 10 hours throughout the whole process, so that the thiophene monomer and the anhydrous ferric chloride adsorbed on the surface of the elemental sulfur undergo in-situ chemical polymerization. Then the excess waste liquid was filtered off, and anhydrous methanol was added to wash for ...

Embodiment 2

[0034]Weigh elemental sulfur and thiophene monomer with a mass ratio of 40:60, and weigh anhydrous ferric chloride with a molar ratio of 1:4. Put elemental sulfur and anhydrous ferric chloride into the reaction kettle, and add anhydrous chloroform until the solids are completely submerged. Control the temperature in the kettle at 0-10°C, and stir at a speed of 1000r / min for 30 minutes to mix the solids evenly. Put the quantitative monomer thiophene into the feeder and slowly and evenly add it to the reaction kettle. Keep stirring at a speed of 1000r / min and keep the temperature in the kettle at 0-10°C for 10 hours throughout the whole process, so that the thiophene monomer and the anhydrous ferric chloride adsorbed on the surface of the elemental sulfur undergo in-situ chemical polymerization. Then the excess waste liquid was filtered off, and anhydrous methanol was added to wash for several times until the filtrate was colorless. Then add deionized water to wash until the f...

Embodiment 3

[0038] Weigh elemental sulfur and thiophene monomer with a mass ratio of 55:45, and weigh anhydrous ferric chloride with a molar ratio of 1:4. Put elemental sulfur and anhydrous ferric chloride into the reaction kettle, and add anhydrous chloroform until the solids are completely submerged. Control the temperature in the kettle at 0-10°C, and stir at a speed of 1000r / min for 30 minutes to mix the solids evenly. Put the quantitative monomer thiophene into the feeder and slowly and evenly add it to the reaction kettle. Keep stirring at a speed of 1000r / min throughout the whole process and keep the temperature in the kettle at 0-10°C for 10 hours to make in-situ chemical polymerization of thiophene monomer and anhydrous ferric chloride adsorbed on the surface of elemental sulfur. Then the excess waste liquid was filtered off, and anhydrous methanol was added to wash for several times until the filtrate was colorless. Then add deionized water to wash until the filtrate is neutra...

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Abstract

The invention comprises a preparation method of composite anode material for lithium element sulphur secondary battery, belonging to the field of chemical energy storage battery. The composite material is formed by taking element sulphur as electrode active center and conductive polymer polythiophene with excellent in-situ chemical oxidation polymerization conductivity as shell. The concrete preparation method comprises adding anhydrous chloroform in element sulphur and anhydrous ferric chloride, mixing uniformly, putting into a controllable low temperature reaction kettle, and slowly adding monomer thiophene by adopting in-situ chemical oxidation polymerization process to clad polythiophene on the surface of sulphur granules to form the composite product with uniform granules. The composite anode material prepared by the inventive method has high electrochemical activity, and the battery packed by the material has large discharge specific volume and long cycle life, thus having advantage in new system of large volume energy storage battery.

Description

technical field [0001] The invention relates to a method for preparing a composite positive electrode material for lithium elemental sulfur secondary batteries, belonging to the field of chemical energy storage batteries. In the method, elemental sulfur is used as an electrode active center, and polythiophene, a conductive polymer with good electrical conductivity, is used as a shell by in-situ chemical oxidation polymerization, and an elemental sulfur composite material with high electrochemical activity and large discharge specific capacity is prepared. Background technique [0002] Lithium-sulfur secondary batteries are considered to be one of the most promising new secondary battery systems based on multi-electron reaction mechanisms. The theoretical specific capacity of the reaction between elemental sulfur and lithium is 1675mAh / g, and the mass specific energy reaches 2600Wh / kg (Li 2 S), much higher than the current traditional lithium-ion secondary battery materials ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/139H01M4/38
CPCY02E60/122Y02E60/10
Inventor 吴锋陈君政陈人杰吴生先陈实李丽王国庆
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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