Multifunctional lithium-sulfur battery diaphragm as well as preparation method and application thereof

A lithium-sulfur battery, multi-functional technology, applied in battery pack parts, circuits, electrical components and other directions, can solve the problems of affecting the performance of battery separators, adverse coating uniformity, not very ideal, etc., to improve cycle safety, Achieve mass production and reduce wastage

Active Publication Date: 2020-03-24
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the existing coating modification technology, the composition of the coating layer and the selection of composite materials are often very complicated and the effect is not very ideal, and the current means of achieving orderly compliance of materials is through vacuum filtration, which is not conducive to the uniformity of coating , thereby affecting the performance of the battery separator, while the vacuum filtration method is not suitable for commercialization

Method used

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  • Multifunctional lithium-sulfur battery diaphragm as well as preparation method and application thereof
  • Multifunctional lithium-sulfur battery diaphragm as well as preparation method and application thereof
  • Multifunctional lithium-sulfur battery diaphragm as well as preparation method and application thereof

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preparation example Construction

[0035] The invention also discloses a preparation method of a multifunctional lithium-sulfur battery diaphragm, which includes the following steps:

[0036] S1: Prepare the main material aqueous solution with a concentration of 2.0mg / ml~6.0mg / ml and the graphene oxide aqueous solution with a concentration of 2.0mg / ml~11.5mg / ml respectively, filter the main material aqueous solution into a slurry, and mix with the graphene oxide aqueous solution Mixing, using auxiliary methods such as manual grinding, magnetic stirring or homogenizer to mix the two evenly to obtain a stable and dispersed functional slurry; the content of graphene oxide is 20wt.% ~ 60wt.%; the content of the main material is 40wt. .%~80wt.%, the sum of the content of graphene oxide and the content of the host material is 100%.

[0037] S2: Use a 30-90-micron thick doctor blade to evenly coat the functional slurry in step S1 on the surface of the basic diaphragm, and dry it for 6-10 hours at a temperature of 60°C-8...

Embodiment 1

[0050] A multifunctional lithium-sulfur battery separator, specifically, graphene oxide is used as an inductive material, and the concentration is controlled in the range where it has strong liquid crystallinity; another 2D nanomaterial, boron nitride nanosheet, is used as the main material, after many times After screening, it is stored in aqueous solution. As an inductive material, graphene oxide mainly plays the role of inducing orientation of liquid crystals, and its content is 60wt.%. Another nano-sheet material, boron nitride, is used as the main material, and its content is controlled at 40wt.%. The thickness of the functional coating is 5 microns. The base diaphragm was a commercial diaphragm polyethylene diaphragm (JSM-16).

[0051] The specific preparation method is:

[0052] (1) Weigh 9.7935g of boron nitride nanosheet aqueous solution (the solute mass is 0.0391g), and vacuum filter until the filter membrane only contains a small amount of solvent and the boron ni...

Embodiment 2

[0056] A multifunctional lithium-sulfur battery separator, specifically, graphene oxide is used as an inductive material, and the concentration is controlled in the range where it has strong liquid crystallinity; another 2D nanomaterial, boron nitride nanosheet, is used as the main material, after many times After screening, it is stored in aqueous solution. Graphene oxide, as an inductive material, mainly plays the role of inducing orientation of liquid crystals, and its content is 40wt.%. Another nanosheet material, boron nitride, is used as the main material, and its content is controlled at 60wt.%. The thickness of the functional coating is 5 microns. The base diaphragm was a commercial diaphragm polyethylene diaphragm (JSM-16).

[0057] The specific preparation method is:

[0058] (1) Weigh 35.4283g of an aqueous solution of boron nitride nanosheets (the solute mass is 0.2183g), and vacuum filter until the filter membrane only contains a small amount of solvent and the ...

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Abstract

The invention discloses a multifunctional lithium-sulfur battery diaphragm which is characterized by comprising a basic diaphragm and a coating layer, wherein the coating layer comprises graphene oxide and a main body material, and the main body material is one of boron nitride, aluminum carbonitride or molybdenum disulfide. The invention further discloses a preparation method and application of the multifunctional lithium-sulfur battery diaphragm. According to the multifunctional lithium-sulfur battery diaphragm disclosed by the invention, the graphene oxide is adopted to induce the main bodymaterial, so that the dispersity problem of the nano materials is solved, the two nano materials are compounded in order, shuttling of polysulfide is more effectively inhibited, and the mechanical strength and heat resistance of the diaphragm are synergistically enhanced. According to the preparation method of the diaphragm, a solvent evaporation induced self-assembly means is adopted, so that ordered compounding of two 2D nano materials is realized, the coating thickness can be flexibly controlled, and large-scale production is realized.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, and more specifically relates to a multifunctional lithium-sulfur battery diaphragm, a preparation method and an application. Background technique [0002] Lithium-sulfur batteries are widely used in portable electronic products such as notebook computers, smart phones, digital cameras, and new energy vehicles due to their high energy density, long cycle life, safety, reliability, and environmental protection. [0003] In the internal structure of a lithium-sulfur battery, the positive electrode, negative electrode, separator and electrolyte are its core components. Among them, the diaphragm is the key inner component with the most technical barriers in the lithium-ion battery industry chain. Its main functions are: (1) to isolate the positive and negative poles of the battery, to prevent the two poles from contacting and short circuit; (2) as a migration channel for lithium ion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14B82Y40/00B82Y30/00H01M50/403H01M50/431H01M50/449H01M50/489
CPCB82Y40/00B82Y30/00H01M50/431H01M50/403Y02E60/10
Inventor 解孝林陈芳妍叶昀昇石清璇周兴平
Owner HUAZHONG UNIV OF SCI & TECH
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