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Composite cathode sheet for lithium-sulfur battery and preparation method thereof, and application thereof

A lithium-sulfur battery and composite cathode technology, applied in the field of electrochemical energy, can solve the problems of numerous preparation steps and harsh conditions for microporous sulfur carriers, and achieve the effects of avoiding the loss of active sulfur, improving the utilization rate, and high conductivity.

Active Publication Date: 2019-04-23
XIAN JIAOTONG LIVERPOOL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation steps of microporous sulfur supports are many and the conditions are harsh.

Method used

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Examples

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preparation example Construction

[0029] The present invention relates to a method for preparing the above composite positive electrode sheet for lithium-sulfur batteries, which includes the following steps:

[0030] S 1 , Preparation of nano-microporous carbon;

[0031] The carbon nanomaterial and polyvinylidene fluoride are mixed uniformly in a weight ratio of 1:1 to 1:3, and N-methyl-2-pyrrolidone is added to completely dissolve the polyvinylidene fluoride. After fully stirring, the mixture is placed in a nitrogen stream Under protection, heat to 700~900℃, keep for 0.5~4h, cool to room temperature, take out and rinse thoroughly with deionized water, vacuum dry at 50~80℃ for 8~36h to obtain nanoporous carbon with nanoscale micropores on the surface material;

[0032] S 2 , Preparation of nano-microporous carbon-sulfur composite materials;

[0033] The obtained nano-microporous carbon and sulfur powder are uniformly mixed in a weight ratio of 1:0.5~1:2, sealed in a vacuum container, heated to 120~200℃, kept for 8~12...

Embodiment 1

[0040] This embodiment relates to a method for preparing a lithium-sulfur battery, including the following steps:

[0041] S 1 , Preparation of one-dimensional nanoporous carbon;

[0042] The single-walled carbon nanotubes and polyvinylidene fluoride were mixed uniformly in a weight ratio of 1:1.5, and NMP was added to completely dissolve the polyvinylidene fluoride. After fully stirring, the mixture was heated to 700°C under the protection of nitrogen gas flow, and kept warm. 2h, after cooling to room temperature, take it out and rinse thoroughly with deionized water. After vacuum drying at 70°C for 24h, a one-dimensional nanoporous carbon material with nano-scale micropores (pore size <0.8nm) on the surface is obtained;

[0043] S 2 , Preparation of one-dimensional nanoporous carbon-sulfur composite materials;

[0044] The obtained one-dimensional nanoporous carbon and sulfur powder are uniformly mixed in a weight ratio of 1:1, sealed in a vacuum container, heated to 155°C, kept for...

Embodiment 2

[0052] This embodiment relates to a method for preparing a lithium-sulfur battery, including the following steps:

[0053] S 1 , Preparation of two-dimensional nanoporous carbon;

[0054] The thin-layer graphene and polyvinylidene fluoride are mixed uniformly in a weight ratio of 1:2, and NMP is added to completely dissolve the polyvinylidene fluoride. After fully stirring, the mixture is heated to 800°C under the protection of nitrogen gas, and kept for 2h After cooling down to room temperature, take it out and rinse thoroughly with deionized water, and dry it in vacuum at 70°C for 24 hours to obtain a two-dimensional nanoporous carbon material with nano-scale micropores (pore size <0.8nm) on the surface;

[0055] S 2 , Preparation of two-dimensional nanoporous carbon-sulfur composite materials;

[0056] The obtained two-dimensional nanoporous carbon and sulfur powder are mixed uniformly in a weight ratio of 1:2, sealed in a vacuum container, heated to 155°C, kept for 12h, cooled to ...

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Abstract

The present invention provides a composite cathode sheet for a lithium-sulfur battery and a preparation method thereof, and application thereof. The composite cathode sheet comprises a nano microporous carbon-sulfur composite material, conductive agent and polyvinylidene fluoride. The aperture of the nanoporous carbon in the composite material is smaller than 0.8nm. The common existence form S8 ofsublimed sulfur is converted to short-chain sulfur molecules S2-4 to prevent the lithium-sulfur battery from generating diffluent high-order polysulfide in the discharge process, avoid generation ofa shuttle effect and improve the cycle stability of the lithium-sulfur battery.

Description

Technical field [0001] The invention relates to a technology in the field of electrochemical energy, in particular to a composite positive electrode sheet for lithium-sulfur batteries, a preparation method and application thereof. Background technique [0002] The current rapid development of the electric vehicle industry is subject to the biggest constraint from the lack of battery capacity. In order to increase the mileage after a single charge, people urgently need a power source with a larger unit weight to capacity to replace the traditional lithium-ion battery. The lithium-sulfur battery is a secondary chemical power source with sulfur as the battery's positive electrode. Its specific capacity is as high as 1675mAh / g, which is much higher than the capacity (<300mAh / g) of lithium cobalt oxide batteries that are widely used commercially. The electric vehicle industry has huge appeal. At the same time, the elemental sulfur used in the positive electrode active material is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/36H01M4/38H01M4/62H01M10/0525H01M4/139B82Y30/00B82Y40/00
CPCH01M4/13H01M4/139H01M4/364H01M4/38H01M4/625H01M4/628H01M10/0525B82Y30/00B82Y40/00H01M2004/028Y02E60/10
Inventor 易若玮杨莉赵策洲袁宇丹刘晨光赵胤超林向飞
Owner XIAN JIAOTONG LIVERPOOL UNIV
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