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
CN111499998AActive Publication Date: 2020-08-07GUANGXI UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
GUANGXI UNIV
Publication Date
2020-08-07

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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.
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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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