A film-forming method for a polymer-based solid electrolyte

A technology of solid electrolyte and film-forming method, applied in circuits, fuel cells, electrical components, etc., can solve the problems of exposed polymer film skeleton, uneven distribution of fillers, poor structural uniformity, etc., to achieve good compositional uniformity and easy continuous. The effect of high production and production efficiency

Active Publication Date: 2021-10-15
CHANGSHA RES INST OF MINING & METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the thickness of the porous framework, the size of the pores, the difference in wettability to the slurry, etc., make the film quality of the polymer membrane based on the porous framework have certain problems, such as: exposure of the polymer membrane framework, poor structural uniformity, denseness, etc. Problems such as low height and uneven filler distribution

Method used

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  • A film-forming method for a polymer-based solid electrolyte
  • A film-forming method for a polymer-based solid electrolyte
  • A film-forming method for a polymer-based solid electrolyte

Examples

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Embodiment 1

[0031] A film-forming method of a polymer-based solid electrolyte of the present invention, comprising the following steps:

[0032] (1) 0.5g lithium perchlorate was added in 10gDMF, stirred for 2 hours to fully dissolve the lithium salt;

[0033] (2) 3g of polymethylethylene carbonate was added to the mixed solution after step (1), stirred for 6 hours, and the viscosity was adjusted to 10Pa·s by adding DMF to obtain a homogeneously mixed polymer slurry;

[0034] (3) The slurry is scraped and coated with a layer of 50um wet film on the glass substrate, and then covered with cellulose non-woven fabric on the surface of the wet film;

[0035] (4) Apply the polymer slurry obtained in step (2) uniformly on the surface of the cellulose non-woven fabric with a thickness of 30 μm and a pore size distribution of 0.5um to 1um by scraping, with a thickness of 200um, and then place it in 60 ℃ oven for 12 hours, and then transferred to 100 ℃ vacuum oven for 12 hours to obtain a polymer-b...

Embodiment 2

[0039] A film-forming method of a polymer-based solid electrolyte of the present invention, comprising the following steps:

[0040] (1) Add 0.8 g of lithium bis(trifluoromethylsulfonyl)imide to 10 g of acetonitrile, stir for 2 hours to fully dissolve the lithium salt;

[0041] (2) Add 5 g of polyethylene oxide to the mixed solution after step (1), stir vigorously for 24 hours, add a small amount of acetonitrile to adjust the viscosity to 30 Pa·s, and obtain a homogeneously mixed polymer slurry;

[0042] (3) Spray the slurry on a stainless steel substrate with a layer of 120um wet film, and then cover the surface of the wet film with PET non-woven fabric;

[0043] (4) Apply the polymer slurry obtained in step (2) evenly on the surface of PET non-woven fabric with a thickness of 10 μm and a pore size distribution of 25-40 μm by spraying, control the thickness at 150 μm, and then place it at 80 ° C Dry it in an oven for 12 hours to obtain a polyethylene oxide polymer membrane, ...

Embodiment 3

[0045] A film-forming method of a polymer-based solid electrolyte of the present invention, comprising the following steps:

[0046] (1) Add 0.25g lithium difluorooxalate borate to 10g tetrahydrofuran, stir for 2 hours to fully dissolve the lithium salt;

[0047] (2) 4g of polyethylene carbonate was added to the mixed solution after step (1), stirred for 6 hours, and tetrahydrofuran was added to adjust the viscosity to 20Pa·s to obtain a homogeneously mixed polymer slurry;

[0048] (3) The slurry is scraped and coated with a layer of 150um wet film on the polytetrafluoroethylene substrate, and then covered with glass fiber cloth on the surface of the wet film;

[0049] (4) Apply the polymer slurry obtained in step (2) evenly on the surface of glass fiber cloth with a thickness of 250 μm and a pore size distribution of 5 um to 10 um by scraping, control the thickness at 300 um, and then place it at 60 ° C Dry in an oven for 12 hours, and then move the preliminarily dried polym...

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Abstract

The invention discloses a method for forming a film of a polymer-based solid electrolyte, which comprises the following steps: (1) adding lithium salt and a polymer into a polar solvent, stirring evenly to form a film with a viscosity of 0.1Pa·s to 10Pa·s uniform slurry; (2) scrape or spray the slurry on the rigid substrate to form a layer of wet film, and then cover the porous framework material on the surface of the wet film; (3) uniformly coat the slurry on the porous framework material A layer of wet film is formed on the surface, and then dried to form a polymer-based solid electrolyte membrane. In the film-forming method of the present invention, by coating the film twice, the polymer slurry can be well adsorbed on the inside and surface of the porous skeleton material to achieve the effect of sufficient wetting, which is conducive to the discharge of air bubbles. After drying, it forms smooth, A polymer solid electrolyte membrane with a uniform structure and no internal defects ensures the ionic conductivity and tensile strength of the polymer-based solid electrolyte.

Description

technical field [0001] The invention belongs to the technical field of lithium ion battery preparation, and in particular relates to a polymer-based solid electrolyte film-forming process. Background technique [0002] Solid-state batteries are one of the hottest technical routes in current lithium battery technology, and one of the difficulties affecting the industrialization of solid-state batteries lies in the industrialization process of solid-state electrolyte membranes. At present, the preparation technology of polymer electrolyte membrane is still mainly carried out by liquid phase methods such as pouring and casting, which must have a substrate as a supporting layer for the liquid slurry. In the traditional substrate, the polymer film is prepared by a one-time film-forming method, because the pores generated by the liquid-solid tension two phases on the substrate side cannot be completely wetted, or the bubbles generated in the bottom layer during the solvent volatil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/1018H01M8/1069H01M8/1086H01M10/0525
CPCH01M8/1018H01M8/1069H01M8/1086H01M10/0525Y02E60/10Y02E60/50
Inventor 何特特涂飞跃鞠博伟王艳华覃事彪景茂祥杨华陈浩华松沈湘黔
Owner CHANGSHA RES INST OF MINING & METALLURGY
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