All-solid-state polyelectrolyte film, its preparation and application method

A polyelectrolyte, all-solid-state technology, applied in circuits, electrical components, secondary batteries, etc., can solve problems such as the preparation method of all-solid-state polyelectrolyte films, and achieve excellent film-forming properties, improve safety performance, and thermal stability good sex effect

Inactive Publication Date: 2013-10-23
浙江爱科新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] In the published articles and patents, there is no report on the all-solid polyelectrolyte film based on polyvinyl acetal and its preparation method

Method used

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  • All-solid-state polyelectrolyte film, its preparation and application method
  • All-solid-state polyelectrolyte film, its preparation and application method
  • All-solid-state polyelectrolyte film, its preparation and application method

Examples

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Effect test

Embodiment 1

[0045] Take 0.8631g polyvinyl formal (molecular weight 60000-80000, degree of alcoholysis 79%) and dissolve it in 5.7344g dimethyl sulfoxide, fully stir to dissolve completely, and prepare a homogeneous and clear transparent solution. The organic solvent used here can be, but not limited to, dimethyl sulfoxide, and the organic solvent is preferably at least one of N-methylpyrrolidone, N,N-dimethylformamide, chloroform, dimethyl sulfoxide, tetrahydrofuran A sort of. Add 0.0284g of boric acid to the above solution, (equivalent to a molar ratio of hydroxyl and boron atoms of 2:1), stir magnetically at 70°C for 5 hours, then add 0.0187g of lithium carbonate and 0.0114g of oxalic acid (boron atom: lithium atom: The molar ratio of oxalic acid is 2:1:2), stirred in a water bath at 90°C for 24 hours, coated on a clean glass plate with a coating machine, and dried to obtain a polyelectrolyte membrane. The lithium salt used here can be but not limited to lithium carbonate. The method ...

Embodiment 2

[0047] Take 0.8594g polyvinyl formal (molecular weight 60000-80000, degree of alcoholysis 79%) and dissolve it in 5.7344g N,N-dimethylformamide, stir well to dissolve completely, and prepare homogeneous transparent solution. The organic solvent used here can be, but not limited to N,N-dimethylformamide, the organic solvent is preferably N-methylpyrrolidone, N,N-dimethylformamide, chloroform, dimethyl sulfoxide, At least one of tetrahydrofuran and the like. Add 0.1237g of boric acid to the above solution (equivalent to a molar ratio of hydroxyl and boron atoms of 1:2), stir magnetically at 80°C for 5 hours, then add 0.048g of lithium hydroxide and 0.1801g of oxalic acid (boron atom: lithium atom: The molar ratio of oxalic acid is 2:1:2), and after stirring in an oil bath at 120°C for 24 hours, it was coated on a clean glass plate with a coating machine, and the polyelectrolyte membrane was obtained after air drying. The lithium salt used here may be but not limited to lithium...

Embodiment 3

[0049] Take 0.8597g of polyvinyl butyral (molecular weight is about 70000) and dissolve it in 5.7344g of N,N-dimethylformamide, stir well to dissolve completely, and prepare a homogeneous transparent solution. The organic solvent used here can be, but not limited to N,N-dimethylformamide, the organic solvent is preferably N-methylpyrrolidone, N,N-dimethylformamide, chloroform, dimethyl sulfoxide, At least one of tetrahydrofuran and the like. In the above solution, 0.0124g of boric acid (equivalent to a molar ratio of hydroxyl to boron atom of 5:1), magnetically stirred at 60°C for 5 hours, then added 0.0044g of methyllithium and 0.0180g of oxalic acid (boron atom: lithium atom: oxalic acid The molar ratio is 2:1:2), and after stirring in an oil bath at 110°C for 24 hours, it was coated on a clean glass plate with a coating machine, and the polyelectrolyte membrane was obtained after air drying. The lithium salt used here may be but not limited to methyllithium. The method of...

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Abstract

The invention provides an all-solid-state polyelectrolyte film based on polyvinyl formal or its homolog and a preparation method thereof. Through stepwise reaction of polyvinyl formal or its homolog and boric acid, oxalic acid, and a lithium salt in an organic solvent system, the solid-state polyelectrolyte film with polyvinyl acetal as a main chain and a lithium mono(oxalato)borate structure grafted on a polymer molecular chain can be formed. With low cost and simple operation, the all-solid-state polyelectrolyte film prepared by the invention can realize large-scale production, and has ideal ionic conductivity, electrochemical stability window and mechanical properties. Therefore, the all-solid-state polyelectrolyte film can be used as all-solid-state electrolyte in polymer lithium ion batteries to improve the safety performance of the lithium ion batteries.

Description

technical field [0001] The invention belongs to the technical field of polymer film preparation and application, and in particular relates to an all-solid polyelectrolyte film based on polyvinyl formal or its homologues, a preparation method thereof, and an application in all-solid polymer lithium-ion batteries. Background technique [0002] Lithium-ion batteries are widely used in portable electronic products such as mobile phones and notebook computers due to their high energy density, high output voltage, no memory effect, and light weight. In recent years, the trend of using them in new energy vehicles and aviation aircraft is also increasingly obvious. However, since the main component of the organic liquid electrolyte used in lithium-ion batteries is a carbonate-based organic solvent with a low flash point and a low boiling point, the properties of volatile, flammable, and easy to leak can cause problems such as fire and explosion, so the application The safety on new...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0525C08F216/38C08F8/44C08J5/18
CPCY02E60/122Y02E60/10
Inventor 连芳关红艳潘笑容文焱
Owner 浙江爱科新材料有限公司
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