Preparation method for all-solid-state environment-friendly biopolymer electrolyte film

A technology of biopolymers and electrolyte membranes, applied in circuits, electrical components, secondary batteries, etc., can solve problems such as environmental pollution and environmental hazards, and achieve the effects of reducing pollution, simple acquisition, and wide sources

Active Publication Date: 2018-01-26
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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), polyacrylo

Method used

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  • Preparation method for all-solid-state environment-friendly biopolymer electrolyte film
  • Preparation method for all-solid-state environment-friendly biopolymer electrolyte film
  • Preparation method for all-solid-state environment-friendly biopolymer electrolyte film

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specific Embodiment approach 1

[0015] Embodiment 1: The preparation method of a kind of all-solid environment-friendly biopolymer electrolyte membrane of this embodiment is carried out according to the following steps:

[0016] 1. Preparation of modified starch

[0017] Carry out modification to potato starch, stand-by;

[0018] 2. Preparation of all-solid-state environment-friendly biopolymer electrolyte membrane

[0019] Weigh a certain amount of modified starch and cellulose acetate with a weighing bottle, add solvent, blend and stir on a magnetic stirrer at room temperature for 12 hours, then add lithium salt and stir for 6 hours, pour the solution onto a glass plate, put In a vacuum drying oven, dry at 0.08MPa and 120°C for 40min to obtain the product electrolyte membrane.

specific Embodiment approach 2

[0020] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the preparation method of an all-solid-state environment-friendly biopolymer electrolyte membrane described in step 1 is characterized in that the preparation method of modified starch is: taking starch Heating with solvent N,N-dimethylformamide in a water bath at 60°C for 30 minutes, then adding phthalic anhydride and pyridine and continuing to blend and stir in a water bath until the solution becomes a uniform paste, then Precipitate the modified starch with isopropanol, then put it into a vacuum drying oven, dry it at 0.08 MPa and 120°C, and grind the product after drying to obtain the modified starch. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0021] Specific embodiment three: the difference between this embodiment and one of the specific embodiments one to two is that the preparation method of an all-solid-state environment-friendly biopolymer electrolyte membrane described in step two is characterized in that the lithium salt used is Lithium bistrifluoromethanesulfonyl imide. Others are the same as in the first or second embodiment.

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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...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/0525C08L3/02C08L1/12C08K5/56
CPCY02E60/10
Inventor 李丽波谢明王福日刘波
Owner HARBIN UNIV OF SCI & TECH
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