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Thermosensitive cellulose ether hydrogel based reversible overheat protection water system electrolyte, and preparation method and applications thereof

A cellulose ether, water-based electrolyte technology, applied in the direction of hybrid capacitor electrolytes, etc., can solve the problems of low critical dissolution temperature, electrochemical energy storage devices do not have practical application value, etc., achieve no environmental pollution, and meet reversible overheating protection. , the effect of excellent electrochemical performance

Inactive Publication Date: 2019-04-30
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, common temperature-sensitive polymers such as poly(N-isopropylacrylamide) (PNIPAM) have a low critical solution temperature (LCST, ≈32°C), and thus do not have practical application value in electrochemical energy storage devices.

Method used

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  • Thermosensitive cellulose ether hydrogel based reversible overheat protection water system electrolyte, and preparation method and applications thereof
  • Thermosensitive cellulose ether hydrogel based reversible overheat protection water system electrolyte, and preparation method and applications thereof
  • Thermosensitive cellulose ether hydrogel based reversible overheat protection water system electrolyte, and preparation method and applications thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Weigh 20g of distilled water and heat it to 50°C, add 0.02g of methylcellulose within 5min under stirring, continue to stir and heat for 2h; dissolve 2.8404g of anhydrous sodium sulfate in 20g of distilled water, and under 4°C ice bath, The sodium sulfate solution was slowly added dropwise to the methyl cellulose solution at a rate of 3 drops / s, and the stirring was continued for 2 hours and then allowed to stand at room temperature for 12 hours to obtain an electrolyte based on a temperature-sensitive methyl cellulose hydrogel, such as figure 1 As shown, it is a colorless and transparent homogeneous solution.

Embodiment 2

[0030] Weigh 20g of distilled water and heat it to 65°C, add 0.04g of methylcellulose within 20min under stirring, continue to stir and heat for 6h; measure 4.3mL of concentrated sulfuric acid and dissolve it in 20g of distilled water, and place it in an ice bath at 0°C. The sodium sulfate solution was slowly added dropwise to the methyl cellulose solution at a rate of 1 drop / s, and the stirring was continued for 0.5 h and then allowed to stand at room temperature for 8 h to obtain an electrolyte solution based on a temperature-sensitive methyl cellulose hydrogel. The electrolyte undergoes a sol-gel phase transition at 75℃, such as figure 2 As shown, the colorless and transparent homogeneous solution (a) turns into a white opaque gel (b) at high temperature.

Embodiment 3

[0032] Weigh 25g of distilled water and heat it to 80°C, add 2.5g of hydroxypropyl methylcellulose within 30 minutes with stirring, continue to stir and heat for 8 hours; measure 1.197g of lithium hydroxide dissolved in 25g of distilled water, and ice bath at 0°C Under the conditions, the sodium sulfate solution was slowly added dropwise to the methyl cellulose solution at a rate of 5 drops / s, and the stirring was continued for 0.5 hours, and then it was allowed to stand at room temperature for 12 hours to obtain the electrolysis based on the temperature-sensitive hydroxypropyl cellulose hydrogel. liquid. The electrolyte undergoes a sol-gel phase transition at 60℃, such as image 3 Shown.

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Abstract

The invention provides a thermosensitive cellulose ether hydrogel based reversible overheat protection water system electrolyte, and a preparation method and applications thereof. Cellulose ether canbe taken as an additive; hydrogen bonds can be formed by utilizing hydrophilic groups of cellulose ether molecules and the water molecules of the electrolyte under lower critical solution temperature(LCST), which is shown as a solution and basically has no influences on electrochemical properties; a gel network structure can be formed through dehydration at a high temperature (> LCST); and the transmission of ions in the electrolyte can be inhibited so that a conductive path can be closed, and therefore, fast and intelligent response of the water system electrolyte on temperature changing canbe realized, and ideal reversible overheat protection of working at normal temperature and closing with temperature rising can be achieved.

Description

Technical field [0001] The invention relates to the field of overheating protection of supercapacitors, and more specifically to a reversible overheating protection aqueous electrolyte based on a temperature-sensitive cellulose ether hydrogel, and a preparation method and application thereof. Background technique [0002] Supercapacitors have the advantages of stable cycle performance, low self-discharge rate, long service life and no pollution. They have been developed rapidly in the past two decades and are often used in occasions that require instantaneous high power such as vehicle starting engine ignition. However, supercapacitors have poor high temperature resistance and heat dissipation performance. The internal high temperature caused by the instantaneous high current may cause the diaphragm to deform and eventually cause a local short circuit, thereby causing thermal runaway. The existing safety protection measures for supercapacitors cannot meet the requirements for temp...

Claims

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Application Information

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IPC IPC(8): H01G11/64C08J3/075C08L1/28
CPCC08J3/075C08J2301/28H01G11/64Y02E60/13
Inventor 许鑫华石芸慧张茜贾丽敏张岩
Owner TIANJIN UNIV