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Cellulose polymer electrolyte membrane, and preparation method and application thereof

A technology of cellulose polymers and electrolyte membranes, which is applied in hybrid capacitor electrolytes, hybrid/electric double layer capacitor manufacturing, etc. It can solve the problems of reducing the electrochemical performance of all-solid-state SCs, insufficient flexibility of supercapacitors, and non-renewable electrolytes. , to achieve excellent electrochemical performance, outstanding cycle stability, and superior flexibility

Active Publication Date: 2017-09-05
NORTHEAST FORESTRY UNIVERSITY
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  • Claims
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Problems solved by technology

[0004] However, traditional polymer electrolytes are non-renewable, have poor biodegradability, insufficient mechanical properties, and low ionic conductivity. The preparation methods usually use non-green solvents, and the steps are cumbersome and time-consuming, which reduces the potential of all-solid-state SCs to a certain extent. Electrochemical performance and its application in other energy storage devices are limited, and the flexibility of the assembled supercapacitor is insufficient, and its electrochemical performance will be seriously affected in a large bending state

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  • Cellulose polymer electrolyte membrane, and preparation method and application thereof
  • Cellulose polymer electrolyte membrane, and preparation method and application thereof
  • Cellulose polymer electrolyte membrane, and preparation method and application thereof

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preparation example Construction

[0040] The invention provides a method for preparing a cellulose polymer electrolyte membrane, comprising the following steps:

[0041] mixing the solvent and the cellulose to obtain a raw material liquid phase mixture;

[0042] Degassing the raw material liquid phase mixture to obtain a degassed system;

[0043] After the degassing system is coated on the surface of the carrier, the humidity control treatment is performed and then replaced in the replacement solution to obtain a hydrogel system;

[0044] The hydrogel system is placed between two polytetrafluoroethylene microporous membrane microplates, and dried to obtain a cellulose membrane;

[0045] The cellulose membrane is adsorbed in the electrolyte to obtain a cellulose polymer electrolyte membrane.

[0046] The invention mixes the solvent and the cellulose to obtain the raw material liquid phase mixture. In the present invention, the solvent is preferably an ionic liquid, a mixed solution of NaOH and urea, or a mix...

Embodiment 1

[0072] Add 50 g (0.286 mol) of [Bmim]Cl ionic liquid into a 250 mL three-necked flask equipped with a condenser, and mechanically stir for 10 min in an oil bath at 85° C. Add 2.08g of bamboo cellulose into the three-necked flask above, and stir mechanically at 85°C until the cellulose is completely dissolved, and the system turns into a transparent viscous liquid for 30 minutes. Pour it into a 100mL beaker and place it in a vacuum drying phase with a temperature of 85°C and a vacuum of 0.01MPa for degassing treatment for 6h to obtain a final uniform and transparent [Bmim]Cl / cellulose system.

[0073] [Bmim]Cl / cellulose is evenly placed on a polished silicon wafer carrier by spin coating, and the coating thickness is 2mm, and then the cellulose is conditioned in the air with a humidity of 55% for 6h, so that The cellulose has a moisture content of 25%. Then it was placed in distilled water at 30°C, and after the water molecules completely replaced the [Bmim]Cl ionic liquid (60...

Embodiment 2

[0091] A mixed solution of 50 g of NaOH and urea (the mass concentration of NaOH is 8%, and the mass concentration of urea is 13%) was added into a 250 mL three-neck flask, and mechanically stirred for 20 min in an ice bath (-12°C). Add 2.08g of cotton cellulose into the above three-necked flask, and stir mechanically at -12°C until the cellulose is completely dissolved, and the system turns into a transparent viscous liquid for 5 minutes. A uniform and transparent NaOH / urea / cellulose system can be obtained.

[0092] NaOH / urea / cellulose is evenly placed on the polished silicon wafer carrier by spin coating, and the coating thickness is 2mm, and then the cellulose is left to stand in the air with a humidity of 60% for 5h to adjust the humidity, so that the The humidity of the cellulose reaches 25%. Then put it in distilled water at 30°C, and after about 60 minutes, a uniform transparent hydrogel is formed. The hydrogel was sandwiched between two 0.1 μm PTFE microporous membra...

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Abstract

The invention provides a cellulose polymer electrolyte membrane, and a preparation method and application thereof. According to the invention, cellulose is used as a raw material, so the membrane has high porosity, electrolyte absorption performance and electrolyte retention performance due to reassembling of molecular structures of cellulose and a great amount of mesoporous structures among the molecular structures and is thus improved in ionic conductivity; and the membrane has good mechanical properties due to action of a great number of hydrogen bonds among the molecular chains of cellulose and formation of a three-dimensional homogeneous system. The cellulose polymer electrolyte membrane provided by the invention can be repeatedly folded, has good surface flexibility and transparency, abundant mesoporous structures and adjustable pore diameters; the pore diameters become larger and more uniform with prolongation of humidification time; the cellulose polymer electrolyte membrane porosity of 71.78%, ionic conductivity of 0.325 s / cm and good mechanical properties. As the cellulose polymer electrolyte membrane provided by the invention is applied to a flexible all-solid-state supercapacitor and a minisized supercapacitor, the membrane has good electrochemical performance and the prepared supercapacitors have scalability.

Description

technical field [0001] The invention relates to the technical field of electrolyte membranes, in particular to a cellulose polymer electrolyte membrane and its preparation method and application. Background technique [0002] Polymer electrolytes are a novel application in flexible, portable and high-performance energy storage devices, such as supercapacitors, lithium-ion batteries (Li-ion), lithium-sulfur batteries (Li-S) and zinc-air batteries (Zn-O 2 ) and other non-liquid electrolyte materials in secondary batteries have dual functions of electrolyte and separator. [0003] Polymer electrolyte membranes have attracted increasing attention due to their high ionic conductivity, wide electrochemical window, and safety in use. Polymer electrolyte membranes have dual functions of electrolyte and separator, facilitating the development of energy storage systems for portable and wearable electronic devices. So far, many efforts have been made by technicians to prepare high-pe...

Claims

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Application Information

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IPC IPC(8): C08J9/40C08J9/28C08J3/075C08J5/18H01G11/84H01G11/56
CPCY02E60/13C08J9/40C08J3/075C08J5/18C08J9/28C08J2301/02H01G11/56H01G11/84
Inventor 于海鹏赵大伟张奇陈文帅
Owner NORTHEAST FORESTRY UNIVERSITY
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