Repairable cross-linked solid polymer electrolyte as well as preparation method and application thereof

A solid polymer and electrolyte technology, applied in non-aqueous electrolyte batteries, electrolyte immobilization/gelation, circuits, etc., can solve the problems of LMBs failure, easy fracture, leakage of chemical electrolyte, etc., and achieve good electrochemical performance , good thermal stability, good self-healing effect

Active Publication Date: 2020-09-18
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under the current technical conditions, although the thin polymer electrolyte membrane in flexible lithium metal batteries has a high degree of flexibility, it is easy to break when deformed and cannot be repaired, resulting in the failure of LMBs, and may even cause safety accidents such as chemical electrolyte leakage.

Method used

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  • Repairable cross-linked solid polymer electrolyte as well as preparation method and application thereof
  • Repairable cross-linked solid polymer electrolyte as well as preparation method and application thereof
  • Repairable cross-linked solid polymer electrolyte as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0040] Weigh 0.0056g of terephthalaldehyde (TPA), 0.25g of polyethylene glycol diamine (NH 2 -PEG-NH 2 ), and 0.0284g of bisphenol A diglycidyl ether (DGEBA) was added to an appropriate amount of anhydrous acetonitrile solvent. Then the mixture was stirred on an intelligent constant temperature and timed magnetic stirrer for 4 hours to make it dissolve completely. Use a disposable plastic dropper to drop the homogeneous and transparent mixture obtained by stirring on the polytetrafluoroethylene mold. The solvent was evaporated at normal temperature (until the obtained liquid became a sol state). Finally, put it into a vacuum drying oven and heat it at 100°C for 6 hours to obtain a yellow transparent and brittle film.

Embodiment example 2

[0042] Weigh 0.0083g of terephthalaldehyde (TPA), 0.25g of polyethylene glycol diamine (NH 2 -PEG-NH 2 ) and 0.0426g of bisphenol A diglycidyl ether (DGEBA) were then added with 0.1466g of lithium bistrifluoromethanesulfonimide (LiTFSI), dissolved in acetonitrile solvent, and then the sample was stirred on an intelligent constant temperature timing magnetic stirrer 4h to dissolve completely. Use a disposable plastic dropper to drop the transparent mixture obtained by stirring onto the Teflon mold. Develop at room temperature, volatilize the solvent (until the liquid becomes a sol state), and finally heat-cure at 100°C for 8 hours, and dry in vacuum for 48 hours to obtain a yellow transparent flexible polymer film.

Embodiment example 3

[0044] Weigh 0.0042g of terephthalaldehyde (TPA), 0.25g of polyethylene glycol diamine (NH 2 -PEG-NH 2) and 0.0213g of bisphenol A diglycidyl ether (DGEBA) were then added with 0.1371g of lithium bistrifluoromethanesulfonylimide (LiTFSI), dissolved in acetonitrile solvent, and then the sample was stirred on an intelligent constant temperature timing magnetic stirrer 4h to dissolve completely. Use a disposable plastic dropper to drop the transparent mixture obtained by stirring onto the Teflon mold. Develop at room temperature, volatilize the solvent (until the liquid becomes a sol state), and finally heat-cure at 100°C for 12 hours, and dry in vacuum for 48 hours to obtain a yellow transparent flexible polymer film.

[0045] figure 1 It is the infrared spectrogram of the polymer electrolyte thin film that embodiment 3 prepares, from figure 1 It can be seen in: at 1650cm -1 A strong imine bond absorption band (-N=CH-) appeared at , indicating the formation of Schiff base b...

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Abstract

The invention provides a repairable cross-linked solid polymer electrolyte as well as a preparation method and application thereof, and the repairable cross-linked solid polymer electrolyte is prepared by the following method: dispersing and dissolving terephthalaldehyde, bisphenol A diglycidyl ether, polyethylene glycol diamine and a lithium salt in an acetonitrile solvent, and carrying out stirring for 2-6 hours to obtain a transparent and uniform mixed solution A; dropwise adding the mixed solution A onto a polytetrafluoroethylene mold, and volatilizing acetonitrile at room temperature to obtain a sol-like substance B; and putting the sol-like substance B into a vacuum drying oven, carrying out polymerization reaction to completely crosslink and solidify the sol-like substance B, and continuously heating to dry the sol-like substance B to prepare the polymer electrolyte. According to the invention, a dynamic imine covalent bond is introduced into the polymer electrolyte to form thesolid network-shaped polymer electrolyte, so that the solid network-shaped polymer electrolyte can be repaired in time when fracture occurs in the use process; the prepared network-like polymer electrolyte has high thermal stability and dendritic-crystal-free morphology, and has excellent electrochemical properties such as ionic conductivity and lithium ion migration number.

Description

technical field [0001] The invention relates to the field of lithium metal batteries, in particular to a repairable cross-linked solid polymer electrolyte and its preparation method and application. Background technique [0002] In response to the "energy crisis" and increasingly stringent environmental protection requirements, governments of various countries have introduced new energy policies to encourage the development of new and green new energy. At the same time, as people's material living standards are getting higher and higher, the demand for energy is increasing rapidly, which promotes the rapid development of energy storage, especially battery technology. In the 1990s, after Sony Corporation developed a commercial lithium metal battery using a graphite negative electrode based on the intercalation reaction mechanism, lithium metal batteries quickly occupied high-end electronic devices such as notebook computers and mobile phones. With the development of technolo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/052
CPCH01M10/052H01M10/0565H01M2300/0085Y02E60/10
Inventor 曹晓燕童永芬沈恒冰许秋华
Owner NANCHANG HANGKONG UNIVERSITY
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