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 elec

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0024] Example 1

[0025] Dissolve 1g of CEC with a degree of substitution of 2.25 in 50g of N,N-dimethylformamide (DMF) to form a transparent solution, pour 25g of the solution into a petri dish with a diameter of 9cm, and place it in an oven at 80°C for 12h to dry. A CEC film with a thickness of approximately 85 μm. After cutting to a suitable size, immerse the dried CEC film 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 wipe off the excess electrolyte on the surface to obtain CEC gel polymer electrolyte .

Example Embodiment

[0026] Example 2

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

Example Embodiment

[0028] Example 3

[0029] Dissolve 1g of CEC with a degree of substitution of 2.5 in 50g of N,N-dimethylformamide (DMF) to form a transparent solution, pour 25g of the solution into a petri dish with a diameter of 9cm, and put it in an oven at 80℃ for 12h to dry. A CEC film with a thickness of approximately 85 μm. After cutting to a suitable size, immerse the dried CEC film in lithium tetrafluoroborate (LiBF 4 ): Ethylene carbonate (EC): Dimethyl carbonate (DMC) = 1:1:1 in the electrolyte for 6 hours to gel state, use filter paper to gently wipe the excess electrolyte on the surface to obtain 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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