Ionic liquid gel electrolyte, preparation method thereof, and application thereof

A gel electrolyte and ionic liquid technology, which is applied in the manufacture of electrolyte batteries, composite electrolytes, non-aqueous electrolyte batteries, etc., can solve problems such as poor interface stability and poor mechanical properties of ionic liquid gel electrolytes, and achieve excellent mechanical properties , good thermal stability, and high room temperature ionic conductivity

Inactive Publication Date: 2019-08-20
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides an ionic liquid gel electrolyte, its preparation method and application, which uses the cross-linked and interpenetrating organic and inorganic double network structures as the skeleton of the electrolyte , using ionic liquids as plasticizers to form an organic-inorganic double network structure ionic liquid gel electrolyte with excellent mechanical properties and electrochemical properties, thus solving the problem of poor mechanical properties of the existing ionic liquid gel electrolytes, and positive and negative Technical problem of poor interface stability between poles

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  • Ionic liquid gel electrolyte, preparation method thereof, and application thereof
  • Ionic liquid gel electrolyte, preparation method thereof, and application thereof
  • Ionic liquid gel electrolyte, preparation method thereof, and application thereof

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preparation example Construction

[0060] The present invention also provides a preparation method of the above-mentioned ionic liquid gel electrolyte, comprising the following steps:

[0061] (1) Mix and stir the ionic liquid containing lithium salt, inorganic oxide precursor and formic acid in a mass ratio of 1:(0.010-0.030):(0.035-0.104) to obtain a first mixed system; in this step, the dioxide Inorganic network structure composed of silica is obtained by preparing silicon precursor by non-aqueous sol-gel method under catalytic action;

[0062] (2) mixing the molar ratio of 1:(0.005-0.020):(0.001-0.01) polymer monomer N,N-dimethylacrylamide, crosslinking agent and initiator to obtain a second mixed system;

[0063] (3) after the second mixed system is added to the first mixed system, a reaction precursor mixed solution is obtained; wherein, the mass ratio of the ionic liquid containing lithium salt and N,N-dimethylacrylamide is 1:( 0.05-0.2); transfer the reaction precursor mixed solution into a mold, or us...

Embodiment 1

[0079] Weigh 2 g of Li(G4)TFSI, add 150 μL of ethyl orthosilicate and 198 μL of formic acid, and continue stirring at room temperature for 1.5 h at a rotational speed of 700 rpm. Subsequently, 0.4 g of N,N-dimethylacrylamide, 2.5 mg of N,N'-methylenebis(acrylamide) and 0.6 mg of α-ketoglutaric acid were added thereto, and the mixture was continuously stirred for 10 min to make it uniform. Pour the above mixed solution into a polytetrafluoroethylene mold, and use an ultraviolet light source with a wavelength of 365 nm and a power of 6 W to initiate the polymerization reaction. 2 Organic-inorganic double network structure ionic liquid gel.

[0080] figure 1 It is shown that the electrolyte solid framework is distributed in a spatial three-dimensional network structure, and the two independent networks are each cross-linked and penetrate each other, figure 2 for this polyN,N-dimethylacrylamide / SiO 2 Schematic illustration of the organic-inorganic double network structure. i...

Embodiment 2

[0082] Weigh 2 g of Li(G4)TFSI, add 150 uL of ethyl orthosilicate and 198 uL of formic acid, and continue stirring at room temperature for 1.5 h at a rotational speed of 700 rpm. Subsequently, 0.4 g of N,N-dimethylacrylamide, 2.5 mg of N,N'-methylenebis(acrylamide) and 6.6 mg of azobisisobutyronitrile were added thereto, and stirring was continued for 10 min to make the mixture uniform. Coat a layer of the above mixed solution with a thickness of 100 μm on the polyethylene terephthalate substrate by a doctor blade coating method, and use a UV light source with a wavelength of 365 nm and a power of 300 W to initiate the polymerization reaction, and turn off the UV light source after 5 minutes. Obtained polyN,N-dimethylacrylamide / SiO with a thickness of 100 μm 2 Organic-inorganic double network structure ionic liquid gel membrane.

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Abstract

The invention belongs to the field of electrolyte materials and more particularly relates to an ionic liquid gel electrolyte, a preparation method thereof and application thereof. The ionic liquid electrolyte includes an electrolyte framework and a plasticizer dispersed in the framework, wherein the electrolyte framework has double-network structures with organic network structures and inorganic network structures, the double-network structures are crosslinked and penetrate each other, and the plasticizer is a solvated ionic liquid. The ionic liquid electrolyte is an organic-inorganic double-network structure ionic liquid gel electrolyte which is rapidly prepared and has excellent mechanical properties and electrochemical properties. A LiFePO4 / Li battery assembled with the electrolyte hada capacity retention rate of 97% after 300 charge and discharge cycles, and an assembled Li4Ti5O12 / Li battery had a discharge specific capacity of 170 mAhg-1 after 160 charge and discharge cycles.

Description

technical field [0001] The invention belongs to the field of electrolyte materials, and more particularly, relates to an ionic liquid gel electrolyte, a preparation method and application thereof. Background technique [0002] In recent years, gel electrolytes composed of solid polymer frameworks and liquid plasticizers (usually electrolytes used in lithium-ion batteries) have shown great promise in the field of quasi-solid-state lithium batteries. It not only effectively eliminates the risk of liquid electrolyte leakage, but also has no significant interface problems with the positive and negative electrodes of the battery compared with solid electrolytes, and the ionic conductivity at room temperature can also meet the needs of normal battery operation. [0003] Compared with electrolytes using ordinary electrolytes as plasticizers, ionic liquid gel electrolytes have the characteristics of high thermal stability, low flammability and wide electrochemical stability window. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/058H01M10/0525
CPCH01M10/0525H01M10/0565H01M10/058H01M2300/0088Y02E60/10Y02P70/50
Inventor 胡先罗余乐
Owner HUAZHONG UNIV OF SCI & TECH
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