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A kind of polyether sulfide based polymer electrolyte and preparation method thereof

A sulfide-based, polymer technology, applied in the field of lithium-ion battery electrolyte materials, can solve the problems of poor mechanical properties, low room temperature ion conductivity, poor mechanical properties, etc., achieve stable electrochemical window, improve ion conductivity, good mechanical properties

Active Publication Date: 2022-05-03
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polymer electrolytes mainly include polyethylene oxide (PEO), polyacrylonitrile (PAN), polymethyl methacrylate (PMMA) and polyvinylidene fluoride (PVDF) according to different substrates, among which polyethylene oxide ( PEO) is currently the most suitable matrix material for the preparation of polymer electrolytes. Its advantage is that it can form a stable complex with lithium salts, and realize the migration of Li+ by means of the movement of PEO chain segments, but it is easy to crystallize, which makes the ion conductivity at room temperature relatively low. low (at 10 -6 S / cm below), and the mechanical properties are not good
However, the modification (blending, copolymerization, grafting, crosslinking) and compounding of PEO failed to solve the problems of low room temperature ion conductivity and poor mechanical properties at the same time.

Method used

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  • A kind of polyether sulfide based polymer electrolyte and preparation method thereof
  • A kind of polyether sulfide based polymer electrolyte and preparation method thereof
  • A kind of polyether sulfide based polymer electrolyte and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] In the glove box, weigh 1,2-ethanedithiol (0.404g, mercapto group content 8.55mmol), diethylene glycol divinyl ether (0.719g, double bond content 9mmol), tetrakis(3-mercaptopropionic acid ) Pentaerythritol (0.058g, mercapto group content 0.45mmol) and other three reaction raw materials in a 10mL small glass bottle, mix well, add 0.659g lithium bis(trifluoromethyl)sulfonimide, stir after mixing, so that the lithium salt is completely Dissolve evenly, then add 0.024g benzoin dimethyl ether, stir well to obtain polyether sulfide-based polymer electrolyte prepolymer mixed solution

[0026] Pour the prepolymer mixed solution into a smooth and flat polytetrafluoro round mold, shake the mold gently so that the prepolymer mixed solution slowly covers the bottom of the mold, let it stand for 1 minute, and then irradiate with ultraviolet light for 3 minutes. Under the action of a photoinitiator, the mercapto-ene click reaction is carried out, and the film is solidified to obtain ...

Embodiment 2

[0028] In the glove box, weigh 1,2-ethanedithiol (0.383g, mercapto group content 8.1mmol), diethylene glycol divinyl ether (0.719g, double bond content 9mmol), tetrakis (3-mercaptopropionic acid ) Pentaerythritol (0.116g, mercapto group content 0.9mmol) and other three reaction raw materials in a 10mL small glass bottle, mix well, add 0.672g lithium bis(trifluoromethyl)sulfonimide, stir after mixing, so that the lithium salt is completely Dissolve evenly, then add 0.024g benzoin dimethyl ether, stir well to obtain polyether sulfide-based polymer electrolyte prepolymer mixed solution

[0029] Pour the prepolymer mixed solution into a smooth and flat polytetrafluoro round mold, shake the mold gently so that the prepolymer mixed solution slowly covers the bottom of the mold, let it stand for 1 minute, and then irradiate with ultraviolet light for 3 minutes. Under the action of a photoinitiator, the mercapto-ene click reaction is carried out, and the film is solidified to obtain a...

Embodiment 3

[0031] In the glove box, weigh 1,2-ethanedithiol (0.340g, mercapto group content 7.2mmol), diethylene glycol divinyl ether (0.719g, double bond content 9mmol), tetrakis (3-mercaptopropionic acid ) pentaerythritol (0.232g, mercapto group content 1.8mmol) and other three reaction raw materials in a 10mL small glass bottle, mix well, add 0.698g lithium bis(trifluoromethyl)sulfonimide, stir after mixing, so that the lithium salt is completely Dissolve evenly, then add 0.026g benzoin dimethyl ether, stir well to obtain polyether sulfide-based polymer electrolyte prepolymer mixed solution

[0032] Pour the prepolymer mixed solution into a smooth and flat polytetrafluoro round mold, shake the mold gently so that the prepolymer mixed solution slowly covers the bottom of the mold, let it stand for 1 minute, and then irradiate with ultraviolet light for 3 minutes. Under the action of a photoinitiator, the mercapto-ene click reaction is carried out, and the film is solidified to obtain a...

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Abstract

The invention discloses a polyether sulfide-based polymer electrolyte and a preparation method thereof, which uses 1,2-ethanedithiol containing dithiol, diethylene glycol divinyl ether containing a diene structure, and tetramercapto The three reaction raw materials of the crosslinking agent tetrakis (3-mercaptopropionic acid) pentaerythritol, add lithium salt, photoinitiator and plasticizer, and prepare the cross-linked network structure in one step by ene-mercapto click chemical reaction under ultraviolet light irradiation Polyether sulfide based polymer electrolyte. The obtained polymer electrolyte has good mechanical properties, high ion conductivity and stable electrochemical window, and the lithium ion battery assembled with the polymer electrolyte of the invention has the characteristics of good safety performance and stable cycle.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery electrolyte materials, and relates to a polyether sulfide-based polymer electrolyte and a preparation method thereof. Background technique [0002] Lithium-ion batteries are widely used in electronic products, mobile devices, electric vehicles and other fields due to their advantages such as high specific energy density, high working voltage, low self-discharge rate, long life, and no memory effect. At present, lithium-ion batteries mainly use liquid electrolyte systems, but their thermal stability is not good, and they are prone to safety hazards such as liquid leakage and short circuits caused by heat shrinkage of the diaphragm. The use of polymer electrolytes instead of liquid electrolytes not only overcomes the problem of poor safety of liquid electrolytes, but also effectively inhibits the growth of lithium dendrites in the negative electrode, and is easy to process and shape, which provide...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0565H01M10/0525C08G75/045
CPCH01M10/0565H01M10/0525C08G75/045H01M2300/0082Y02E60/10
Inventor 肖敏聂石桥孟跃中王拴紧邓魁荣钟雷韩东梅任山
Owner SUN YAT SEN UNIV
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