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

A composite cathode and lithium-sulfur battery 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: 2021-12-31
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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preparation example Construction

[0030] The present invention relates to a preparation method of the above-mentioned composite positive electrode sheet for lithium-sulfur batteries, comprising the following steps:

[0031] S 1 , Preparation of nano-microporous carbon materials;

[0032] Mix the carbon nanomaterials and polyvinylidene fluoride evenly according to the weight ratio of 1:1 to 1:3, add N-methyl-2-pyrrolidone to completely dissolve the polyvinylidene fluoride, and stir the mixture in nitrogen flow Under protection, heat to 700-900°C, keep it warm for 0.5-4h, take it out after cooling down to room temperature, rinse thoroughly with deionized water, vacuum dry at 50-80°C for 8-36h, and obtain nano-microporous carbon with nano-scale micropores on the surface Material;

[0033] S 2 , preparation of nano-microporous carbon-sulfur composites;

[0034] The obtained nano-microporous carbon material and sulfur powder are mixed evenly according to the weight ratio of 1:0.5-1:2, sealed in a vacuum contain...

Embodiment 1

[0041] This embodiment relates to a preparation method of a lithium-sulfur battery, comprising the following steps:

[0042] S 1 , preparation of one-dimensional nanoporous carbon materials;

[0043] Mix the single-walled carbon nanotubes and polyvinylidene fluoride evenly according to the weight ratio of 1:1.5, add NMP to completely dissolve the polyvinylidene fluoride, and after fully stirring, heat the mixture to 700°C under the protection of nitrogen flow, and keep it warm After cooling down to room temperature for 2 hours, take it out and rinse it thoroughly with deionized water, and dry it in vacuum at 70°C for 24 hours to obtain a one-dimensional nanoporous carbon material with nanoscale micropores (pore diameter <0.8nm) on the surface;

[0044] S 2 , preparation of one-dimensional nanoporous carbon-sulfur composites;

[0045] Mix the obtained one-dimensional structure nano-microporous carbon material and sulfur powder evenly according to the weight ratio of 1:1, sea...

Embodiment 2

[0053] This embodiment relates to a preparation method of a lithium-sulfur battery, comprising the following steps:

[0054] S 1 , preparation of two-dimensional structure nano-microporous carbon materials;

[0055] Mix the thin-layer graphene and polyvinylidene fluoride evenly according to the weight ratio of 1:2, add NMP to completely dissolve the polyvinylidene fluoride, and after fully stirring, heat the mixture to 800°C under the protection of nitrogen flow, and keep it warm for 2 hours , after cooling down to room temperature, take it out and rinse it thoroughly with deionized water, and dry it in vacuum at 70°C for 24 hours to obtain a two-dimensional structure nanoporous carbon material with nanoscale micropores (pore diameter <0.8nm) on the surface;

[0056] S 2 , Preparation of two-dimensional structure nano-microporous carbon-sulfur composites;

[0057] Mix the obtained two-dimensional structure nano-microporous carbon material and sulfur powder evenly according ...

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Abstract

A composite positive electrode sheet for a lithium-sulfur battery in the technical field of electrochemical energy, its preparation method and application, including a nano-microporous carbon-sulfur composite material, a conductive agent and polyvinylidene fluoride; the nano-microporous carbon in the composite material The pore size is less than 0.8nm. In the present invention, the existing form S of common sublimated sulfur 8 Conversion to short-chain sulfur molecules S 2‑4 , to avoid the generation of easily soluble high-order polysulfides in the lithium-sulfur battery during the discharge process, to prevent the occurrence of the shuttle effect, and to 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 a lithium-sulfur battery, its preparation method and application. Background technique [0002] The current rapid development of the electric vehicle industry is the biggest constraint from the lack of battery capacity. In order to improve the mileage after a single charge, people urgently need a power source with a larger unit weight ratio capacity to replace the traditional lithium-ion battery. The lithium-sulfur battery is a secondary chemical power source with sulfur as the positive electrode of the battery. Its specific capacity is as high as 1675mAh / g, which is much higher than the capacity of the widely used lithium cobalt oxide battery (<300mAh / g). The electric vehicle industry has enormous appeal. At the same time, the sulfur element used in the positive electrode active material is an environmentally fri...

Claims

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Application Information

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Patent Type & Authority Patents(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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