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Crosslinked cellulose-based gel polymer electrolyte and preparation method thereof

A cellulose and base gel technology, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, circuits, etc., can solve the problems of difficult gelation of cellulose, limited application, large interface impedance, etc., and achieve good application prospects, Effects of high natural abundance and mild manufacturing conditions

Pending Publication Date: 2022-07-08
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in practical applications, cellulose is still difficult to be gelled by commercial ester electrolytes, which limits the further application of natural materials such as cellulose in lithium-ion batteries.
In order to gel the pure cellulose cross-linked membrane, Zhi Du et al. can only use dimethyl sulfoxide (DMSO) containing lithium salt as the electrolyte, which is still far from the commonly used commercial carbonate electrolyte, and it is different from The interface impedance of lithium metal electrodes is relatively large, which limits its further application (A mechanically robust, biodegradable and high performance cellulose gel membrane as gel polymerelectrolyte of lithium-ion battery, Electrochimica Acta, 299(2019), 19–26.)

Method used

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  • Crosslinked cellulose-based gel polymer electrolyte and preparation method thereof
  • Crosslinked cellulose-based gel polymer electrolyte and preparation method thereof
  • Crosslinked cellulose-based gel polymer electrolyte and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] S1, the preparation of water-soluble allyl cellulose:

[0037] (1) According to the mass ratio of 7:12:81, 20.37g of sodium hydroxide, 34.92g of urea, and 235.71g of deionized water were prepared into an alkali / urea solution. The rotating speed of / min was stirred for 2min to obtain a 3% cellulose solution;

[0038](2) In a nitrogen atmosphere at 25°C, add allyl glycidyl ether dropwise to the cellulose solution, and the ratio of the amount of allyl glycidyl ether to the cellulose anhydrous glucose unit is 3:1; shading Under the condition of mechanical stirring or magnetic stirring for 20h, the reacted product was put into acetone with 5 times the mass of the reaction solution, then put into a dialysis bag for 3 days, and then freeze-dried at -45°C for 48h to obtain a white cellulose solid , namely allyl cellulose;

[0039] S2. Preparation of cross-linked cellulose-based gel polymer electrolyte:

[0040] (3) 0.4 g of the above allyl cellulose was dissolved in dimethyl...

Embodiment 2

[0043] S1, the preparation of water-soluble allyl cellulose:

[0044] (1) According to the mass ratio of 5:10:85, 14.55g of sodium hydroxide, 29.10g of urea, and 247.35g of deionized water were prepared into an alkali / urea solution, and at -16 °C, 9g of cellulose powder was added, and 1500r The rotating speed of / min was stirred for 2min to obtain a 3% cellulose solution;

[0045] (2) In a nitrogen atmosphere at 25°C, add allyl glycidyl ether dropwise to the cellulose solution, and the ratio of the amount of allyl glycidyl ether to the cellulose anhydrous glucose unit is 6:1; shading Under the condition of mechanical stirring or magnetic stirring, the reaction was carried out for 30h. The reacted product was put into acetone with 5 times the mass of the reaction solution, then put into a dialysis bag for dialysis for 3 days, and then freeze-dried at -50°C for 48 hours to obtain a white cellulose solid, namely allyl cellulose;

[0046] S2. Preparation of cross-linked cellulos...

Embodiment 3

[0050] S1, the preparation of water-soluble allyl cellulose:

[0051] (1) According to the mass ratio of 7:12:81, 19.95g of sodium hydroxide, 34.20g of urea, and 230.85g of deionized water were prepared into an alkali / urea solution, and at -12°C, 15g of cellulose powder was added, and 1900r The rotating speed of / min was stirred for 5min to obtain a 5% cellulose solution;

[0052] (2) In a nitrogen atmosphere at 30° C., add allyl glycidyl ether dropwise to the cellulose solution, and the ratio of the amount of allyl glycidyl ether to the cellulose anhydrous glucose unit is 12:1; shading Under the condition of mechanical stirring or magnetic stirring for 24 hours, the reacted product was put into acetone with 10 times the mass of the reaction solution, then put into a dialysis bag for dialysis for 7 days, and then freeze-dried at -55 °C for 72 hours to obtain a white cellulose solid , namely allyl cellulose;

[0053] S2. Preparation of cross-linked cellulose-based gel polymer...

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Abstract

The invention discloses a cross-linked cellulose-based gel polymer electrolyte and a preparation method thereof. The method comprises the following steps: a preparation method of water-soluble allyl cellulose with different substitution degrees and a preparation method of the cross-linked cellulose-based gel polymer electrolyte. Wherein allyl cellulose polyethylene glycol dimethacrylate / polyethylene glycol diacrylate with double bonds and 1, 4-butanediol bis (mercaptoacetate) are crosslinked under the irradiation of ultraviolet light through a thiol-ene click reaction to obtain a polymer film; and immersing the cross-linked cellulose-based gel polymer into a carbonic ester electrolyte to obtain the cross-linked cellulose-based gel polymer electrolyte. The ionic conductivity and the interface impedance of the gel polymer electrolyte can be adjusted by changing the substitution degree of the allyl cellulose and the content of the polyethylene glycol dimethacrylate / polyethylene glycol diacrylate. The cross-linked cellulose-based gel polymer electrolyte has high ionic conductivity, high interfacial compatibility, high thermal stability and cycle performance.

Description

technical field [0001] The invention belongs to the field of modified cellulose composite membranes and electrolytes for lithium ion batteries, in particular to a cross-linked cellulose-based gel polymer electrolyte and a preparation method thereof. Background technique [0002] Since the 1990s, the widespread application of lithium-ion batteries has led to in-depth research on separators, gel electrolytes, and solid-state electrolytes. Commercial separators mainly use polyolefin separators and liquid electrolytes. Such polyolefin separators are prone to leakage of liquid electrolytes and poor thermal stability, which may further cause safety problems. Researchers have turned their attention to new electrolytes such as gel electrolytes and solid electrolytes. Gel polymer electrolytes combine some of the advantages of solid electrolytes and liquid electrolytes. They not only have higher ionic conductivity than solid electrolytes at room temperature, but also have better abil...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/0525H01M10/058
CPCH01M10/0565H01M10/0525H01M10/058H01M2300/0085Y02P70/50
Inventor 薛锋吴晗鑫李爽杰柯尊业
Owner SOUTH CHINA UNIV OF TECH