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Preparation method of cellulose-polyvinyl alcohol composite film based on phase inversion and preparation method of supercapacitor

A technology of polyvinyl alcohol and polyvinyl alcohol solution, which is applied in the field of electrochemical materials, can solve the problems of low liquid absorption rate and liquid retention rate, low surface energy, lyophilicity, and poor wettability, and achieve high liquid absorption rate , Good lyophilicity, high liquid retention effect

Active Publication Date: 2020-08-07
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Another object of the present invention is to provide a novel method for preparing an environment-friendly cellulose-polyvinyl alcohol composite membrane. The low surface energy and lyophilicity of the capacitor diaphragm, poor wettability, high impedance, low liquid absorption rate and liquid retention rate, etc.

Method used

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  • Preparation method of cellulose-polyvinyl alcohol composite film based on phase inversion and preparation method of supercapacitor
  • Preparation method of cellulose-polyvinyl alcohol composite film based on phase inversion and preparation method of supercapacitor
  • Preparation method of cellulose-polyvinyl alcohol composite film based on phase inversion and preparation method of supercapacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 1) Take an appropriate amount of dry straw, cut it into small pieces of 3 to 4 cm, and then use a universal grinder for crushing (about 30 seconds for each crushing), and then screen with a 40-mesh sieve to separate the cellulose required for subsequent experiments. raw material.

[0042] 2) Place the screened powder in a solution with a bath ratio of 50g / L for heating in a water bath, add an appropriate amount of 40g / L NaOH and 2g / L NaHSO to the solution 3 , control the temperature of the water bath at 90 degrees Celsius, and heat for 4 hours, during which sufficient stirring is carried out so that the reaction can be carried out well.

[0043] 3) Filter out the solids, add 10g / L sodium chlorite, 5-6ml acetic acid (36-38% commercially available acetic acid), stir and heat in a water bath at 70°C for 4 hours, during which time every 1 hour Add acetic acid once, and add 5-6ml each time. After the water bath heating is completed, the solid matter is fully washed with wa...

Embodiment 2

[0051] The difference between this example and Example 1 is the difference in the amount of cellulose and polyvinyl alcohol added in step (6) (see Table 1 for details), and the prepared composite film is CP-15.

Embodiment 3

[0053] The difference between this example and Example 1 is the difference in the amount of cellulose and polyvinyl alcohol added in step (6) (see Table 1 for details), and the prepared composite film is CP-20.

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Abstract

The invention discloses a preparation method of a cellulose-polyvinyl alcohol composite film based on phase inversion and a preparation method of a supercapacitor. The preparation method comprises thefollowing steps: preparing a cellulose solution from sodium hydroxide, urea and cellulose raw materials; mixing the cellulose solution and a polyvinyl alcohol solution in proportion to form a film toobtain a thin film, wherein cellulose in the thin film accounts for 10-25% of the solid content of the thin film; soaking and regenerating the film by using a mixed solution of calcium chloride and hydrochloric acid, then soaking and plasticizing the film by using glycerol, and finally drying to obtain the cellulose-polyvinyl alcohol composite film. The cellulose and -polyvinyl alcohol compositefilm is prepared by taking cellulose as a raw material and sodium hydroxide, urea and water as solvents and adopting a dissolution-regeneration and phase inversion method. Compared with a traditionalpolyolefin material, the composite film has the advantages of good tensile strength, elongation at break and lyophilicity and high porosity, liquid absorption rate and liquid retention rate. The supercapacitor assembled by the composite film can show good electrochemical performance.

Description

technical field [0001] The invention relates to the technical field of electrochemical materials, more specifically, the invention relates to a method for preparing a phase inversion-based cellulose polyvinyl alcohol composite film and a method for preparing a supercapacitor. Background technique [0002] With the increase in the amount of petrochemical resources and the decrease in reserves, the development of green and renewable new energy has gradually become a global consensus, and the development and utilization of biomass resources has received extensive attention. Cellulose is a large amount, renewable, and environmentally friendly biomass resource. Its film has good wettability, low cost, light weight, low heat shrinkage, and strong mechanical properties. It is expected to be used in the field of supercapacitor diaphragms. At present, most of the diaphragms used in domestic supercapacitors are imported from Europe, the United States (Celgard Company), Japan (NKK Comp...

Claims

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Application Information

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IPC IPC(8): C08L29/04C08L1/02C08J7/12C08J7/14C08J5/22H01G11/52H01G11/84
CPCC08J7/12C08J7/14C08J5/2287C08J5/2231H01G11/52H01G11/84C08J2329/04C08J2401/02Y02E60/13
Inventor 胡冬英徐大满衡映琪滕根辉冯念蓉
Owner GUANGXI UNIV
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