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

A technology of cyanoethyl cellulose and gel polymer, which is applied in the field of battery materials to achieve the effects of improving efficiency, simple components, and wide sources of raw materials

Inactive Publication Date: 2017-10-24
BEIJING INSTITUTE OF TECHNOLOGYGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cyanoethyl cellulose gel polymer electrolyte materials are rarely reported

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Dissolve 1 g of CEC with a degree of substitution of 2.25 in 50 g of N,N-dimethylformamide (DMF) to form a transparent solution, take 25 g of the solution and pour it into a petri dish with a diameter of 9 cm, put it in an oven at 80°C for 12 hours and dry it to obtain CEC film with a thickness of approximately 85 μm. After cutting to a suitable size, the dried CEC membrane was immersed in lithium perchlorate (LiClO 4 ): Ethylene carbonate (EC): Propylene carbonate (PC) = 1:1:1 Electrolyte solution activated for 2h to gel state, use filter paper to gently dry excess electrolyte on the surface to obtain CEC gel polymer electrolyte .

Embodiment 2

[0027] Dissolve 1 g of CEC with a degree of substitution of 2.35 in 50 g of N, N-dimethylacetamide (DMAc) to form a transparent solution, take 25 g of the solution and pour it into a petri dish with a diameter of 9 cm, put it in an oven at 80 ° C for 12 hours and dry it to obtain CEC film with a thickness of approximately 85 μm. After cutting to a suitable size, the dried CEC membrane was immersed in lithium hexafluorophosphate (LiPF 6 ): Ethylene Carbonate (EC): Dimethyl Carbonate (DMC): Ethyl Methyl Carbonate (EMC) = 1:1:1:1 Electrolyte solution activated for 6h to gel state, wipe gently with filter paper Dry the excess electrolyte on the surface to obtain a CEC gel polymer electrolyte.

Embodiment 3

[0029] Dissolve 1 g of CEC with a degree of substitution of 2.5 in 50 g of N,N-dimethylformamide (DMF) to form a transparent solution, take 25 g of the solution and pour it into a petri dish with a diameter of 9 cm, put it in an oven at 80 ° C for 12 hours and dry it to obtain CEC film with a thickness of approximately 85 μm. After cutting to a suitable size, the dried CEC membrane was immersed in lithium tetrafluoroborate (LiBF 4 ): 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 on the surface with filter paper, and obtained the CEC gel polymer electrolyte.

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Abstract

The invention discloses a cyanoethyl cellulose membrane, a cyanoethyl cellulose gel polymer electrolyte and a preparation method thereof. The preparation method comprises the steps of dissolving cyanoethyl cellulose in a solvent so as to form a solution, and then drying to form a membrane; immersing the cyanoethyl cellulose membrane in an electrolyte and activating the membrane to gel; and removing extra electrolyte on the surface of gel so as to obtain the cyanoethyl cellulose gel polymer electrolyte. The cyanoethyl cellulose gel polymer electrolyte prepared through the method has high thermal resistance and corrosion resistance, has wide raw material source, and is renewable and biodegradable; for the cyanoethyl cellulose membrane, the tensile strength is greater than 25MPa, and liquid absorption rate reaches 700%-1300%; and for the cyanoethyl cellulose gel polymer electrolyte, the ion conductivity reaches 10<-3>S / cm at room temperature, the lithium ion transfer rate is greater than 0.7, and the electrochemical stability window is greater than 4.8V. The preparation method of the cyanoethyl cellulose gel polymer electrolyte is simple and practical, and is easy to operate.

Description

technical field [0001] The invention relates to a battery material, in particular to a cyanoethyl cellulose film for a lithium ion secondary battery, a cyanoethyl cellulose gel polymer electrolyte film and a preparation method thereof. Background technique [0002] As a new generation of green high-energy rechargeable batteries, compared with traditional lead-acid batteries, nickel-hydrogen batteries and other secondary batteries, lithium-ion batteries have high single-cell voltage, large specific energy, no memory effect, no pollution, small self-discharge, and cycle Due to its advantages such as long life, it has been widely used in portable electronic products such as notebook computers, smart phones, and digital cameras, and it also has broad development space in the field of power batteries. Traditional commercial lithium-ion batteries generally use flammable organic liquid electrolytes, which pose safety risks such as liquid leakage, combustion and explosion during use...

Claims

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Application Information

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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
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