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Cyanoethyl cellulose glyceryl ether membrane, cyanoethyl cellulose glyceryl ether gel polymer electrolyte and preparation method thereof

A technology of cyanoethyl cellulose and gel polymer is applied in the field of battery materials to achieve the effects of good heat resistance and corrosion resistance, simple and practical preparation process, and wide source of raw materials

Active Publication Date: 2021-05-04
BEIJING INSTITUTE OF TECHNOLOGYGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cyanoethyl cellulose glyceryl ether is expected to become a new type of environmentally friendly polymer electrolyte, and cyanoethyl cellulose glyceryl ether gel polymer electrolyte materials have not been reported

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Dissolve 1 g of CEGEC with a degree of substitution of glycerol ether group of 0.33 and a degree of substitution of cyanoethyl group of 2.89 in 40 g of N,N-dimethylformamide (DMF) to form a transparent solution, and pour 20 g of the solution into a petri dish with a diameter of 9 cm , placed in an oven at 80°C for 12 hours to dry, and a CEGEC film with a thickness of about 80 μm was obtained. After cutting to a suitable size, the dried CEGEC membrane was immersed in lithium hexafluorophosphate (LiPF 6 ): Ethylene carbonate (EC): Diethyl carbonate (DEC): Ethyl methyl carbonate (EMC) = 1:1:1:1 Electrolyte activated for 6h to gel state, gently wipe with filter paper Dry the excess electrolyte on the surface to obtain CEGEC gel polymer electrolyte.

Embodiment 2

[0027] Dissolve 1 g of CEGEC with a degree of substitution of glycerol ether group of 0.69 and a degree of substitution of cyanoethyl group of 3.05 in 30 g of N,N-dimethylacetamide (DMAc) to form a transparent solution, and pour 15 g of the solution into a petri dish with a diameter of 9 cm , placed in an oven at 80°C for 12 hours to dry, and a CEGEC film with a thickness of about 75 μm was obtained. After cutting to a suitable size, the dried CEGEC membrane was immersed in lithium hexafluorophosphate (LiPF 6 ): ethylene carbonate (EC): dimethyl carbonate (DMC) = 1: 1: 1, activated in the electrolyte solution for 6h to the gel state, gently wiped the excess electrolyte solution on the surface with filter paper, and obtained CEGEC gel polymerization matter electrolyte.

Embodiment 3

[0029] Dissolve 1 g of CEGEC with a glyceryl ether substitution degree of 0.98 and a cyanoethyl substitution degree of 3.55 in 50 g of N, N-dimethylformamide (DMF) to form a transparent solution, and pour 25 g of the solution into a 9 cm diameter Petri dish. Put it into an oven at 80° C. for 12 hours and dry it to obtain a CEGEC film with a thickness of about 85 μm. After cutting to a suitable size, the dried CEGEC membrane was immersed in lithium tetrafluoroborate (LiBF 4 ): ethylene carbonate (EC): dimethyl carbonate (DMC) = 1: 1: 1 electrolyte solution activated for 6h to gel state, use filter paper to gently dry excess electrolyte on the surface to obtain CEGEC gel polymer electrolyte.

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Abstract

The invention discloses a cyanoethyl cellulose glyceryl ether membrane, a cyanoethyl cellulose glyceryl ether gel polymer electrolyte and a preparation method thereof. Dissolve cyanoethyl cellulose glyceryl ether in a solvent to form a solution, and then dry it to form a film; immerse the cyanoethyl cellulose glyceryl ether film in the electrolyte to activate it into a gel; remove excess electrolyte on the surface of the gel to obtain cyanoethyl cellulose Cellulose-based glycerol ether gel polymer electrolyte. The cyanoethyl cellulose glyceryl ether gel polymer electrolyte prepared by the invention has good heat resistance and corrosion resistance, wide source of raw materials and has renewability and biodegradability; the prepared cyanoethyl cellulose glyceryl ether membrane The tensile strength is greater than 25MPa, with a liquid absorption rate of 700%-1300%, and the ionic conductivity of the cyanoethyl cellulose glycerol ether gel polymer electrolyte at room temperature reaches 10 ‑3 S / cm level, the lithium ion migration number is greater than 0.7, and the electrochemical stability window is greater than 4.8V; the method of the invention is simple, practical and easy to operate.

Description

technical field [0001] The invention relates to a battery material, in particular to a cyanoethyl cellulose glyceryl ether film for a lithium ion secondary battery, a cyanoethyl cellulose glyceryl ether gel polymer electrolyte and a preparation method thereof. Background technique [0002] Secondary lithium-ion batteries have the advantages of environmental friendliness, high working voltage, large specific capacity and long cycle life, and have been widely used in portable electronic products such as digital cameras, notebook computers, and smart phones. With the development of new energy electric vehicles and large-scale energy storage technologies, the demand for lithium-ion batteries with high specific energy and high safety is becoming more and more urgent. Traditional lithium-ion batteries use flammable organic liquid electrolytes, and polyolefins with poor electrolyte affinity are used as separators, which are prone to liquid leakage. In the case of overcharging or sh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058H01M10/0565
CPCH01M10/0565H01M10/058H01M2300/0082Y02E60/10Y02P70/50
Inventor 王飞俊于淼邵自强谢莹熊勇张成菊
Owner BEIJING INSTITUTE OF TECHNOLOGYGY