A preparation method and application of a lithium sulfide battery positive electrode

A lithium-sulfur battery and cathode technology, which is applied in the field of lithium-sulfur battery electrode materials and the preparation of lithium-sulfur battery cathodes, can solve problems such as excessive battery capacity decay, achieve broad industrial application prospects, reduce dissolution, and have strong operability. Effect

Active Publication Date: 2019-01-11
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem of polysulfide shuttling in the existing lithium-sulfur battery and the rapid decay of battery capacity caused by it, the purpose of the present invention is to propose a lithium-sulfur battery positive electrode material, aiming at improving battery performance

Method used

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  • A preparation method and application of a lithium sulfide battery positive electrode
  • A preparation method and application of a lithium sulfide battery positive electrode
  • A preparation method and application of a lithium sulfide battery positive electrode

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Experimental program
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Effect test

Embodiment 1

[0053] ①Preparation of sulfur positive electrode: Preliminarily mix insoluble sulfur IS6005 (Henan Kailun Chemical Co., Ltd., sulfur content 94%; insoluble sulfur content 60%; oil content 4-6%) with Ketjen black at a mass ratio of 2:1 to obtain 5g After the mixture, add 0.05g of iodonitrobenzene and place it in a vibrating mill for 10 minutes of mixing to obtain mixture A; weigh 0.2g of binder polyvinylidene fluoride (PVDF) and add it to N-methylpyrrolidone (NMP), Stir in a homogenizer for 5 minutes to form a homogeneous solution; then add 1.8 g of mixture A, and stir in a homogenizer for 15 minutes at a speed of 15 kr / min to form a stable and uniform positive electrode slurry. The slurry was coated on a carbon-coated aluminum foil with a doctor blade, and dried in an oven at 80°C for 8 hours until the NMP was completely volatilized.

[0054] ②Lithium-sulfur button cell assembly test: punch the prepared sulfur pole piece into a Φ13mm circular pole piece, and bake it in an oven...

Embodiment 2

[0056] ①Preparation of sulfur cathode: Preliminarily mix insoluble sulfur IS8510 (Henan Kailun Chemical Co., Ltd., sulfur content 89%; insoluble sulfur content 85%; oil content 9-11%) with acetylene at a mass ratio of 2:1 to obtain 5 g of the mixture , then add 0.025g of dibenzothiazole disulfide and place it in a vibrating mill for mixing and grinding for 10min to obtain mixture A; weigh 0.2g of binder polyvinylidene fluoride (PVDF) and add it to N-methylpyrrolidone (NMP). Stir in a homogenizer for 5 minutes to form a homogeneous solution; then add 1.8 g of mixture A, and stir in a homogenizer for 15 minutes at a speed of 15 kr / min to form a stable and uniform positive electrode slurry. The slurry was coated on a carbon-coated aluminum foil with a doctor blade, and dried in an oven at 80°C for 8 hours until the NMP was completely volatilized.

[0057] ②Lithium-sulfur button cell assembly test: punch the prepared sulfur pole piece into a Φ13mm circular pole piece, and bake it ...

Embodiment 3

[0059] ①Preparation of sulfur positive electrode: Preliminarily mix insoluble sulfur IS90 (Henan Kailun Chemical Co., Ltd., sulfur content 99.5%; insoluble sulfur content 90%; oil content 0.5-1%) with acetylene black at a mass ratio of 2:1 to obtain 5g Add 0.025g of dibenzothiazole disulfide to the mixture and place it in a vibrating mill for 10 minutes of mixing to obtain mixture A; weigh 0.2g of binder polyvinylidene fluoride (PVDF) and add it to N-methylpyrrolidone (NMP), Stir in a homogenizer for 5 minutes to form a homogeneous solution; then add 1.8 g of mixture A, and stir in a homogenizer for 15 minutes at a speed of 15 kr / min to form a stable and uniform positive electrode slurry. The slurry was coated on a carbon-coated aluminum foil with a doctor blade, and dried in an oven at 80°C for 8 hours until the NMP was completely volatilized.

[0060] ②Lithium-sulfur button cell assembly test: punch the prepared sulfur pole piece into a Φ13mm circular pole piece, and bake it...

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Abstract

The invention belongs to the field of lithium sulfide battery positive electrode material and specifically relates to a preparation method and application of a lithium sulfide battery positive electrode. The lithium sulfide battery positive electrode comprise a positive electrode active material, a stabilizer, a conductive agent and a bind, wherein that positive electrode active material is insoluble sulfur. The stabilizer is a compound capable of forming a common electron pair with sulfur atoms at both ends of the positive electrode active material, preferably at least one of a halogen, an organic halide and a thiazole compound. The positive electrode active material of the invention greatly reduces the dissolution of the polysulfide, and the insoluble sulfur stabilizer used together caneffectively restrain the generation of dead sulfur and the shuttle effect in the electrode reaction process. The positive electrode assembled lithium sulfide battery provided by the invention has highfirst discharge specific capacity and good cycle performance. In addition, the preparation method of the sulfide positive electrode provided by the invention is low in cost, simple in operation and easy to realize large-scale commercial manufacture.

Description

technical field [0001] The invention relates to the field of lithium-sulfur battery electrode materials, in particular to a method for preparing a positive electrode of a lithium-sulfur battery and a lithium-sulfur battery assembled therefrom. Background technique [0002] In recent years, lithium-sulfur batteries have attracted the attention of researchers because of their high energy density (2500Wh / kg, 2800Wh / L), wide source of active material sulfur, and low price. One of the energy density energy storage devices. But due to its complex electrochemical reaction mechanism, some serious problems [0003] This restricts the practical application of lithium-sulfur batteries. One of the major problems to be solved is the "shuttle effect". During the charge-discharge cycle, the intermediate long-chain polysulfide Li 2 Sx (x=4~8) is very soluble in the ether electrolyte, which leads to the low actual utilization rate of the positive electrode active material, and the actual ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M4/13H01M4/139H01M10/052
CPCH01M4/13H01M4/139H01M4/364H01M4/38H01M4/62H01M4/628H01M10/052Y02E60/10
Inventor 赖延清洪波向前高春晖张治安张凯方静
Owner CENT SOUTH UNIV
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