A kind of preparation method of all-solid environment-friendly biopolymer electrolyte membrane

Abstract

The invention discloses a preparation method of an all-solid-state environment-friendly biopolymer electrolyte film, and relates to a preparation method for a lithium ion battery electrolyte thin film. The problems of low electric conductivity, high cost and poor environmental protection of a lithium ion battery electrolyte thin film prepared by conventional methods are solved. The method comprises the following steps: firstly, preparation of modified starch: taking a proper amount of starch, phthalic anhydride, pyridine and a solvent, under water bath conditions, blending and stirring until the solution becomes a uniform paste substance, then modifying starch with an isopropanol precipitate, next drying in a vacuum drying box, and finally grinding the obtained substance into a powder; andsecondly, preparation of the all-solid-state environment-friendly biopolymer electrolyte film: weighing cellulose, modified starch, a lithium salt and a solvent, blending and stirring, and then drying in the vacuum drying box to form the film. The prepared all-solid-state environment-friendly biopolymer electrolyte film has the advantages of good biodegradability, simple experimental process, wide sources of experimental raw materials, low cost and wide application range.

Description

technical field [0001] The invention relates to a technology in the field of lithium-ion batteries, in particular to a method for preparing an all-solid-state environment-friendly biopolymer electrolyte membrane. Background technique [0002] The biggest problem currently encountered by high specific energy lithium-ion batteries is poor cycle stability and potential safety hazards caused by the use of liquid flammable organic electrolytes. Solid electrolyte has the advantages of low reactivity with electrode materials, light weight, easy film formation, good viscoelasticity, etc., and the battery can be made into various shapes, so that the battery has pressure resistance, impact resistance, low production cost and easy Processing and other advantages. Therefore, solid electrolyte thin films have become an important direction for the development of lithium-ion batteries. [0003] In recent years, both international and domestic people have paid more and more attention to e...

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Problems solved by technology

[0003] In recent years, both international and domestic people have paid more and more attention to environmental protection. For lithium-ion electrolyte membranes, the main materials for researching electrolyte membranes are polymethyl methacrylate (PMMA), polyvinylidene fluoride ( PVDF), polyacrylonitrile (PAN), polyethylene oxide (PEO), etc., these polymers have one thing in common, they are all non-degradable polymers, so this kind of polymer electrolyte membrane has a great impact on the environment Pollution, and the cyano group (-CN) in polyacrylonitrile is more harmful to the environment

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