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High-performance all-solid-state supercapacitor based on gel polymer electrolyte and preparation method thereof

A gel polymer, supercapacitor technology, applied in the field of energy storage, can solve the problems of volatile, flammable, easy to leak liquid electrolytes, achieve good electrochemical performance, good low temperature tolerance, and expand the scope of application.

Active Publication Date: 2021-06-25
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem that the liquid electrolyte in the traditional supercapacitor is volatile, flammable and easy to leak, so that the supercapacitor will not burn and explode under the condition of overcharge and short circuit, the present invention provides a gel-based polymerization A high-performance all-solid-state supercapacitor with a material electrolyte and a preparation method thereof, using a flame-retardant gel polymer electrolyte; utilizing the active P-H bond of a flame retardant (DOPO) to graft to a polymer chain to obtain a flame-retardant gel polymer electrolyte, used to prepare supercapacitors

Method used

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  • High-performance all-solid-state supercapacitor based on gel polymer electrolyte and preparation method thereof
  • High-performance all-solid-state supercapacitor based on gel polymer electrolyte and preparation method thereof
  • High-performance all-solid-state supercapacitor based on gel polymer electrolyte and preparation method thereof

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preparation example Construction

[0061] The preparation method of the flame retardant gel polymer electrolyte of the present invention comprises the following steps:

[0062] 1) Add hexafluorobutyl acrylate (HFBA) and hydroxyethyl methacrylate (HEMA) to the solvent. The solvent is an organic solvent such as DMF, acetonitrile, DMSO, etc., and the solvent consumption is preferably 50%-75%. Based on the total weight of the monomer and the solvent, the solvent accounts for between 50%-75% of the total weight. The amount of solvent has a great influence on the conductivity. In step 1), the molar ratio of HFBA and HEMA is greater than 2:1; its ratio can be very high or even close to infinity, such as the situation that the molar ratio of HFBA and HEMA is 1:0; more preferably, the molar ratio of HFBA and HEMA is ( 2-10): 1; more preferably, the molar ratio of HFBA to HEMA is 4-10:1 (including 4:1, 6:1, 8:1, 10:1). More preferably, the molar ratio of HFBA to HEMA is 8:1.

[0063] 2) Add flame retardant, polyethyle...

Embodiment 1

[0065] The preparation of embodiment 1 gel polymer electrolyte

[0066] HFBA (hexafluorobutyl acrylate) and HEMA (hydroxyethyl methacrylate) were added to the DMF solvent at a molar ratio of 6:1 (the mass ratio of monomer to solvent was 4:6). Then, 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) at 1% by weight relative to the total mass of the monomers was added under stirring, relative to the total mass of the monomers 1.5% by weight polyethylene glycol diacrylate (PEGDA) and 2.5mol L -1 LiTFSI (4.306g) was added to the above solution. Finally, after addition of the initiator (2% AIBN relative to the total mass of monomers), the solution was transferred to a mold. After polymerization at 60 °C for 12 hours, the resulting gel polymer electrolyte (abbreviated as poly(HFBAx-co-HEMAy) was obtained.

Embodiment 2-8

[0067] Preparation of Example 2-8 Gel Polymer Electrolyte

[0068] HFBA and HEMA with different molar ratios (1:0, 10:1, 8:1, 6:1, 4:1, 2:1) were added to a 20 mL glass vial. The solvent consumption is between 50%-75%. Then, DOPO (1% by weight relative to the total mass of the monomer), PEGDA (1.5% by weight relative to the total mass of the monomer) and 0-3mol L -1 LiTFSI was added to the above solution. LiTFSI concentrations were controlled at 0.5, 1, 1.5, 2, 2.5, 3mol L -1 . Finally, after addition of the initiator (2% AIBN relative to the total mass of monomers), the solution was transferred to a mold. After polymerization at 50–80°C for 10–14 hours, the resulting gel polymer electrolyte (abbreviated as poly(HFBAx-co-HEMAy), where x and y represent the molar ratios of HFBA and HEMA, respectively, was obtained. For the reaction conditions, see Table 1.

[0069]Table 1 Preparation parameters of gel polymer electrolyte

[0070]

[0071] In a specific embodiment of t...

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Abstract

The invention belongs to the field of energy storage, and relates to a high-performance all-solid-state supercapacitor based on a gel polymer electrolyte and a preparation method thereof. The supercapacitor comprises electrodes and a gel polymer electrolyte between the electrodes, wherein the flame-retardant gel polymer electrolyte comprises a gel polymer and lithium bis(trifluoromethanesulfonyl) imide (LiTFSI), the lithium bis (trifluoromethanesulfonyl) imide (LiTFSI) exists in the gel polymer in the form of ions, the mass specific capacitance of the electrode of the poly(HFBA8-co-HEMA1) electrolyte-based SC can still be kept at 76% after 8000 times of circulation, the gel-based SC remains substantially unchanged over multiple bending cycles, and the gel-based SC has good resistance to low temperatures and can operate normally in a temperature range of -20 DEG C to 60 DEG C. According to the invention, the multiple advantages of the gel electrolyte expand the application of the gel electrolyte in ion conductors and energy storage equipment, and overcome the defects that the traditional liquid electrolyte is easy to volatilize, inflammable, easy to leak and the like.

Description

technical field [0001] The invention belongs to the field of energy storage, and relates to a high-performance all-solid supercapacitor based on a gel polymer electrolyte and a preparation method thereof. In particular, it relates to a high-performance all-solid-state supercapacitor based on a flame-retardant, high-conductivity and low-temperature-resistant gel polymer electrolyte and its preparation method Background technique [0002] The development of electric vehicles and portable wearable electronic devices has led to a skyrocketing demand for energy storage devices such as lithium-ion batteries and supercapacitors. [0003] The properties of supercapacitor electrode materials and electrolytes are the decisive factors affecting the performance of supercapacitors. Currently, most electrolytes used in energy storage devices are combinations of organic liquids (organic esters or ethers) and lithium salts. One of the most common choices for organic liquids is a mixture o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/56H01G11/86H01G11/84
CPCH01G11/56H01G11/86H01G11/84Y02E60/13
Inventor 刘利彬王济君班青盖利刚李学林姜海辉
Owner QILU UNIV OF TECH
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