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Lithium cell positive material thiofuran polymer and lithium battery preparation method

A positive electrode material, lithium battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of low specific capacity and low energy density, and achieve high energy density, high specific capacity and energy density, and good cycle stability Effect

Active Publication Date: 2007-08-01
SUZHOU YOULION BATTERY INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of polythiophene as a positive electrode material is that the specific capacity is too low. Traditional lithium-polythiophene rechargeable batteries were once commercialized, but because of their low energy density, they withdrew from the market after lithium-ion batteries were launched.
[0007] In lithium-sulfur batteries, polythiophene is used as a conductive binder. US Patent US 20020039680 coats polythiophene on the surface of active particles to improve its conductivity. US Patent US2002034583 uses polythiophene as a binder. Among these technologies , neither polythiophene is used as the active material in the positive electrode

Method used

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  • Lithium cell positive material thiofuran polymer and lithium battery preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Put 0.84g of thiophene and 3.25g of ferric chloride in a mortar and grind at room temperature for about 30 minutes until no HCl gas is released, then stop grinding. Add 50 milliliters of dehydrated ethanol in the beaker, transfer the solid in the mortar to the beaker, stir it electromagnetically for 10 minutes, filter and dry; repeat washing the solid 3 times until the effluent when filtering is colorless. After drying, the product was transferred to a filter paper tube and placed in a Soxhlet extractor. 100 milliliters of dehydrated ethanol is loaded into a 250 milliliter single-necked flask, a Soxhlet extractor is installed, and the above-mentioned crude product is put into the extractor and extracted for two days until the effluent liquid is a colorless and transparent liquid. The product was taken out and dried, weighed 0.75 g, and the yield was 89%.

[0039] Add 50 milliliters of chloroform in a 100 milliliter flask equipped with a reflux condenser, and dissolve 0...

Embodiment 2

[0042] Weigh 0.84g of thiophene, 3.2g of anhydrous ferric chloride, 2.7g of ferric chloride hexahydrate, add them to the mortar, and grind for about 30 minutes under the condition of ice-salt bath (-10°C) until there is no HCl gas Release, stop grinding.

[0043] Add 50 milliliters of absolute ethanol into a beaker, pour the solid in the mortar into the beaker, and stir with electromagnetic for 10 minutes. Filter and dry. The solid was washed repeatedly with 50 ml of absolute ethanol until the effluent was colorless upon filtration. After the crude product is dried, it is transferred to a filter paper tube and placed in a Soxhlet extractor. 100 milliliters of dehydrated ethanol is loaded into a 250 milliliter single-necked flask, a Soxhlet extractor is installed, and the above-mentioned crude product is put into the extractor and extracted for two days until the effluent liquid is a colorless and transparent liquid. The product was dried and weighed 0.73 g, yield 86%.

[0...

Embodiment 3

[0047] Put 0.84g of thiophene and 6.5g of ferric chloride in a mortar, grind for about 30 minutes at a temperature of 4-10°C, stop grinding until no HCl gas is released. Wash the solid with 50 ml of absolute ethanol, add 50 ml of absolute ethanol to a beaker, pour the solid in the mortar into the beaker, and stir for 10 minutes. Filter and dry. The solid was washed with 50 ml of absolute ethanol until the effluent was colorless when filtered. After the crude product is dried, it is transferred to a filter paper tube and placed in a Soxhlet extractor. Put 100 milliliters of absolute ethanol into a 250 milliliter single-necked flask, install a Soxhlet extractor, extract iron in the polymer with ethanol, and extract for two days until the liquid that flows out is a colorless and transparent liquid.

[0048] Dried, weighed 0.76 g, yield 90%.

[0049] Add 50 milliliters of chloroform in a 100 milliliter flask equipped with a reflux condenser, and dissolve 0.76 g of polymer in ch...

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Abstract

The invention discloses an anode material trihalide polymer for lithium battery and the preparation method for lithium battery. Carrying out oxidative polymerization with thiofuran derivatives such as thiofuran, alkoxy thiofuran, alkyl thiofuran, hydro sulfo-thiofuran, 3, 4- sulfo thiofuran to produce poly thiofuran, poly alkoxy thiofuran, poly alkyl thiofuran, poly hydro sulfo-thiofuran, poly 3, 4- sulfo thiofuran; preparing anode with thiofuran polymer, carbon black and politef, and assembling lithium secondary battery by taking (CxF2x+1SO2)2NLi, CxF2x+1SO3Li, (CxF2x+1SO2)(CyF2y+1)NLi as electrolyte, employing dioxohexacyclic ring, dioxolane and glycol dimethyl ether as solvent, and taking metal lithium slice as negative pole. The discharge specific capacity of assembled lithium secondary battery is 400 Ah / kg to 1200 Ah / kg, and the cycling stability is sound.

Description

technical field [0001] The invention relates to the technical field of positive electrode active materials for lithium batteries, and more specifically relates to a polythiophene polymer as a positive electrode material for lithium batteries, and also relates to a preparation method for a rechargeable lithium battery. Rechargeable lithium batteries can be used as energy sources in mobile phones, laptop computers, digital cameras, cars, etc. Background technique [0002] The development of modern science and technology, the shortage of energy sources and the increasing emphasis on environmental protection require rechargeable batteries with high energy density and environmental friendliness. Lithium battery is one of the batteries with the highest energy density, and has no pollution to the environment. The raw material resources used are abundant, which is in line with the direction of battery development. Lithium metal has the highest specific capacity (3680Ah / Kg) and the ...

Claims

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Application Information

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IPC IPC(8): C08G61/12H01M4/60
CPCY02E60/10
Inventor 詹才茂唐静孔令波詹立志张静宇周运鸿詹晖
Owner SUZHOU YOULION BATTERY INC
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