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Cellulose gel electrolyte material and a preparation method thereof

A technology of cellulose gel and electrolyte material, applied in the field of electrolyte material and its preparation, can solve the problems of inability to meet the development of science and technology and market, easy volatilization of solvent and long-term stability, difficult to achieve self-supporting film, etc., and achieve good liquid retention ability , good biocompatibility, the effect of improving properties

Active Publication Date: 2018-08-17
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Electrolytes are divided into three categories according to their state of existence: liquid electrolytes, solid electrolytes, and gel electrolytes. Among them, liquid electrolytes have the highest conductivity, but they have problems such as easy leakage, difficult packaging, volatile solvents used, and poor long-term stability.
Solid-state electrolytes can overcome such problems, but their low conductivity makes them difficult to commercialize
Gel electrolyte has the advantages of both liquid and solid electrolytes. It is an ideal electrolyte material, but it is mainly polymer hydrogel based on polyvinyl alcohol (PVA) and polyethylene glycol (PEG). The raw materials of the matrix are single, which cannot meet the needs of current technology and market development, and further development is needed
Especially when such hydrogels are used in flexible supercapacitors, PVA or PEG and H 2 SO 4 (or other acid, alkali, salt) mixture, the state at this time is not a gel film in the true sense, although a physical gel film can be formed by evaporation of a large amount of water, but at this time it is impossible to take into account the high content Water volume and high mechanical strength, it is difficult to achieve the state of self-supporting membrane

Method used

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  • Cellulose gel electrolyte material and a preparation method thereof
  • Cellulose gel electrolyte material and a preparation method thereof
  • Cellulose gel electrolyte material and a preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Add 1 g of natural cellulose to 3 mL of sodium hydroxide solution with a mass fraction of 16%. After dispersing evenly, first keep it warm at 25°C for 10 minutes, then add 1 mL of carbon disulfide to it, react for 30 minutes, and wait for the product to transform After becoming an orange-red solid, add 6 mL of 4% sodium hydroxide solution, and stir for 10 minutes until it completely becomes a uniform orange-red viscose.

[0027] (2) Mix the viscose solution prepared in step (1) and deionized water at a weight ratio of 1:1, stir evenly, and then stand for crosslinking for 48 hours to obtain a cellulose gel electrolyte (XWD).

[0028] Such as figure 1 As shown, the prepared cellulose gel electrolyte contains a large amount of water and has certain toughness.

[0029] Such as figure 2 As shown, after drying and grinding the gel electrolyte, apply it on the conductive tape, and test it with a scanning electron microscope. It can be seen that the diameter of the inter...

Embodiment 2

[0033] (1) Add 1g of natural cellulose into 4mL of sodium hydroxide solution with a mass fraction of 18%. After the dispersion is even, first keep it warm at 26°C for 20min, then add 1.5mL of carbon disulfide to it, and react for 40min. After turning into an orange-red solid, add 8 mL of 4% sodium hydroxide solution, and stir for 10 minutes until it completely becomes a uniform orange-red viscose.

[0034] (2) Mix the viscose solution prepared in step (1) and deionized water at a weight ratio of 1:3, stir evenly, and then stand for cross-linking for 50 hours to obtain a cellulose gel electrolyte (XWD).

Embodiment 3

[0036] (1) Add 1g of natural cellulose to 5mL of 30% sodium hydroxide solution, after the dispersion is even, first keep it warm at 28°C for 20min, then add 2mL of carbon disulfide to it, react for 50min, and wait for the product to transform After turning into an orange-red solid, add 10 mL of 4% sodium hydroxide solution, and stir for 20 minutes until a uniform orange-red viscose is completely formed.

[0037] (2) Mix the viscose solution prepared in step (1) and deionized water at a weight ratio of 1:6, stir evenly, and then stand for cross-linking for 60 hours to obtain a cellulose gel electrolyte (XWD).

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Abstract

A cellulose gel electrolyte material is prepared from natural cellulose wood pulp, paper pulp, bamboo pulp or degreased cotton, which are used as raw materials and react with sodium hydroxide and carbon disulfide to synthesize a cellulose viscose solution, and a gel-based cellulose gel electrolyte material is formed through hydration treatment. The preparation method comprises the steps of reacting paper pulp (wood pulp, bamboo pulp or degreasing cotton) with sodium hydroxide and carbon disulfide for 30-60 minute, preparing a tangerine viscose liquid, mixing the viscose liquid and deionized water according to the weight ratio of 1: 1-9, obtaining cellulose gel electrolyte material after gel curing, and preparing a composite cellulose gel electrolyte material if an acetonitrile solution ofpotassium ferrocyanide or potassium iodide and iodine is added. The method is simple, the product is easy to form, operation and control are simple and convenient, and industrial production is facilitated. The prepared cellulose gel electrolyte material is a porous gel polymer, has good liquid retention capability and ionic conductivity, and can be applied to a supercapacitor, a solar cell and a lithium battery.

Description

technical field [0001] The invention relates to an electrolyte material and a preparation method thereof. Background technique [0002] Electrolytes are divided into three categories according to their state of existence: liquid electrolytes, solid electrolytes, and gel electrolytes. Among them, liquid electrolytes have the highest conductivity, but they have problems such as easy leakage, difficult packaging, volatile solvents used, and poor long-term stability. . Solid-state electrolytes can overcome such problems, but their low conductivity makes them difficult to commercialize. Gel electrolyte has the advantages of both liquid and solid electrolytes. It is an ideal electrolyte material, but it is mainly polymer hydrogel based on polyvinyl alcohol (PVA) and polyethylene glycol (PEG). The single matrix raw material cannot meet the needs of current technology and market development, and further development is still needed. Especially when such hydrogels are used in flexi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/56H01G9/025H01G9/20H01M10/0565C08J3/075C08L1/02
CPCC08J3/075C08J2301/02H01G9/2009H01G11/56H01M10/0565H01M2300/0085Y02E10/542Y02E60/10Y02E60/13
Inventor 王丽秋张晓博刘学龙刘洋郭晨晓侯亚娟
Owner YANSHAN UNIV
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