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Functionalized diaphragm for lithium-sulfur battery as well as preparation and application of functionalized diaphragm

A lithium-sulfur battery and a functionalized technology, applied in the field of electrolytes, can solve problems such as unfavorable lithium ion conduction, unfavorable battery performance, and uncontrollable thickness, and achieve the effects of less dosage, inhibiting the growth of lithium dendrites, and inhibiting shuttle.

Active Publication Date: 2020-03-17
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the present invention provides a functionalized separator for lithium-sulfur batteries, its preparation and application, which utilizes the static electricity between positively charged materials and negatively charged materials Interaction force, on the surface of the porous diaphragm of the lithium-sulfur battery, a functionalized electrolyte diaphragm with an organic-inorganic structure is obtained through self-assembly of layers of positively and negatively charged materials, thereby solving the problem of the prior art lithium-sulfur battery diaphragm or Structural disorder is not conducive to the conduction of lithium ions, or the thickness is not easy to control, and the inhomogeneity is not conducive to improving the technical problems of battery performance

Method used

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  • Functionalized diaphragm for lithium-sulfur battery as well as preparation and application of functionalized diaphragm
  • Functionalized diaphragm for lithium-sulfur battery as well as preparation and application of functionalized diaphragm
  • Functionalized diaphragm for lithium-sulfur battery as well as preparation and application of functionalized diaphragm

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preparation example Construction

[0050] The present invention also provides a preparation method for the functionalized electrolyte diaphragm, comprising the following steps:

[0051] (1) Pretreating the porous diaphragm of the lithium-sulfur battery, so that the surface of the diaphragm is charged, and the porous diaphragm with charge after the pretreatment is obtained;

[0052] (2) Soak the obtained charged porous membrane in an aqueous solution of a first material, the first material is the positively charged material or the negatively charged material, and the first material has The electrical properties of some charges are opposite to the electrical properties of the charges carried by the porous diaphragm after pretreatment; after soaking, take it out and soak it in deionized water to remove the excess first material, and then take it out and treat it until the surface is dry to obtain Preliminary self-assembled porous membranes;

[0053] (3) Soak the obtained preliminary self-assembled porous membrane...

Embodiment 1

[0072] A functionalized separator for lithium-sulfur batteries made of the positively charged material SiO 2 @PDDA and the negatively charged material PEDOT:PSS are obtained by layer-by-layer self-assembly on the surface of the porous separator Celgard of the lithium-sulfur battery using electrostatic interaction forces. The functionalized separator is an electrolyte material with an ordered organic-inorganic structure.

[0073] Naphthol solution, polydiallyldimethylammonium chloride (PDDA), silicon dioxide (SiO 2 ), poly 3,4-ethylenedioxythiophene / polystyrene sulfonate (PEDOT:PSS) as materials. Follow the steps below to prepare positively charged materials (SiO 2 @PDDA) and SiO 2 Based on the layer-by-layer self-assembly modified separator [(SiO 2 / Celgard-±) n ].

[0074] Preparation of SiO 2 @PDDA:

[0075] (1) Add 0.1g of SiO 2 Nanomaterials were dispersed in 200mL deionized water to obtain the first solution, and stirred at 30°C for 30min to obtain the SiO 2 Homo...

Embodiment 2

[0084] A functionalized separator for lithium-sulfur batteries made of the positively charged material Al 2 o 3 @PDDA and the negatively charged material PEDOT:PSS are obtained by layer-by-layer self-assembly on the surface of the porous separator Celgard of the lithium-sulfur battery using electrostatic interaction forces. The functionalized separator is an electrolyte material with an ordered organic-inorganic structure.

[0085] Naphthol solution, polydiallyldimethylammonium chloride (PDDA), aluminum oxide (Al 2 o 3 ), poly 3,4-ethylenedioxythiophene / polystyrene sulfonate (PEDOT:PSS) as materials. The positively charged material (Al 2 o 3 @PDDA) and Al 2 o 3 Based on the layer-by-layer self-assembly modified separator [(Al 2 o 3 / Celgard-±) n ].

[0086] Preparation of Al 2 o 3 @PDDA:

[0087] (1) 0.1g of Al 2 o 3 Nanomaterials were dispersed in 200mL deionized water to obtain the first solution, and stirred at 30°C for 30min to obtain the Al 2 o 3 Homogene...

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Abstract

The invention belongs to the field of electrolytes, and particularly relates to a functionalized diaphragm for a lithium-sulfur battery as well as preparation and application of the functionalized diaphragm. The functionalized diaphragm is an organic-inorganic structure ordered electrolyte material obtained by layer-by-layer self-assembly of a material with positive and negative charges through electrostatic interaction force; wherein the positively charged material is composed of a hydrophilic positively charged polymer coated inorganic nano material with high mechanical strength and high stability, and the negatively charged material is a hydrophilic negatively charged polymer which can be stably dispersed in water. By simply, conveniently and accurately regulating and controlling the composition, the thickness and the structure of the layer-by-layer self-assembly material, shuttling of polysulfide and growth of lithium dendrites in the charging and discharging process of the lithium-sulfur battery can be effectively inhibited, so that the cycling stability and the safety of the lithium-sulfur battery are improved.

Description

technical field [0001] The invention belongs to the field of electrolytes, and more specifically relates to a functionalized separator for lithium-sulfur batteries, its preparation and application. Background technique [0002] The rapid development of electric vehicles and portable electronic devices has greatly increased the interest in developing advanced energy storage systems with high energy density and long cycle life. Compared with traditional lithium-ion batteries, lithium-sulfur batteries have an ultra-high specific capacity (1675mAh g -1 ), higher energy density (2600Wh kg -1 ), rich in natural sulfur and environmentally friendly are considered to be the most promising lithium battery systems. However, since the polysulfide compounds generated during the charging and discharging process of lithium-sulfur batteries will shuttle between the positive and negative electrodes, not only the utilization rate of active materials and Coulombic efficiency will be reduced,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M10/0562H01M10/0565H01M10/058B82Y30/00
CPCB82Y30/00H01M10/0562H01M10/0565H01M10/058H01M50/403H01M50/446Y02E60/10Y02P70/50
Inventor 解孝林石清璇叶昀昇周兴平陈芳妍游娜常晨
Owner HUAZHONG UNIV OF SCI & TECH
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