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

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: 2022-06-03
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

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 pulverizer for pulverization (each pulverization takes about 30s), and then screen with a 40-mesh sieve to separate out the cellulose that is required for subsequent experiments. raw material.

[0042] 2) Put the screened powder into a solution with a bath ratio of 50g / L for heating in a water bath, and add an appropriate amount of 40g / L NaOH and 2g / L NaHSO to the solution. 3 , the temperature of the water bath is controlled at 90 degrees Celsius, and the mixture is heated for 4 hours, and during this period, sufficient stirring is performed to facilitate the reaction.

[0043] 3) filter out the solid, add 10g / L sodium chlorite, 5~6ml acetic acid (commercially available concentration 36~38% acetic acid), stir and heat under 70 ℃ of water bath conditions for 4 hours, every 1 hour during the period Add acetic acid once, and add 5-6ml each time. After the water bat...

Embodiment 2

[0051] The difference between this example and Example 1 is that the amount of cellulose and polyvinyl alcohol added in step (6) is different (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 that the amount of cellulose and polyvinyl alcohol added in step (6) is different (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, comprising: using sodium hydroxide, urea, and cellulose raw materials to prepare a cellulose solution; combining the cellulose solution and The polyvinyl alcohol solution is mixed in proportion to form a film to obtain a film. The cellulose in the film accounts for 10-25% of the solid content of the film; the film is soaked and regenerated in a mixed solution of calcium chloride and hydrochloric acid, and then soaked in glycerin for plasticization treatment. Dry to obtain a cellulose polyvinyl alcohol composite film. The present invention takes cellulose as raw material, sodium hydroxide, urea and water as solvent, adopts dissolution-regeneration, the method for phase inversion to prepare cellulose polyvinyl alcohol composite film, this composite film has good performance compared with traditional polyolefin materials Tensile strength, elongation at break and lyophilicity, high porosity, liquid absorption and liquid retention. Supercapacitors assembled from this composite film can exhibit good electrochemical performance.

Description

technical field [0001] The present invention relates to the technical field of electrochemical materials, and more particularly, the present invention relates to a method for preparing a cellulose-polyvinyl alcohol composite film based on phase inversion and a method for preparing a super capacitor. Background technique [0002] With the increase in the amount of petrochemical resources and the decrease in reserves, the development of green and renewable energy has gradually become a global consensus, and the development and utilization of biomass resources has received extensive attention. Cellulose is a large-scale, renewable, and environmentally friendly biomass resource. Its membrane 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 separators. At present, most of the diaphragms used in domestic supercapacitors are imported from Europe, the United States (Celgard Co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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