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A composite solid electrolyte membrane and preparation method and application thereof

A technology of solid electrolyte membrane and electrolyte, which can be applied to circuits, electrical components, secondary batteries, etc., and can solve problems such as poor mechanical strength

Active Publication Date: 2018-12-14
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the fast ion conductor ceramic powder dispersed in the skeleton of the electrolyte membrane in this composite form, the mechanical strength is poor.

Method used

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  • A composite solid electrolyte membrane and preparation method and application thereof
  • A composite solid electrolyte membrane and preparation method and application thereof
  • A composite solid electrolyte membrane and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0057] A composite solid electrolyte membrane, such as figure 1 As shown, it has a sandwich structure, including the base membrane of the middle layer, that is, the cellulose separator 1, with a porosity of 45%, a pore size distribution of 2-3 μm, and a thickness of 30 μm, and solid-state membranes coated on both sides of the membrane with a thickness of 2 μm respectively. Polymer electrolyte 2, and solid polymer electrolyte 3, both of which are composed of PEO; ceramic ion conductor powder 4 with a particle size of 2 μm (composed of Li 5 La 3 Nb 2 o 12 ) is anchored in the pores of the cellulose membrane 1 through the binder PEO, and the mass ratio of the ceramic ion conductor powder to the binder is 10:1.

[0058] Its preparation method steps are as follows:

[0059] (1) Ceramic ion conductor powder and binder are dispersed in solvent ethanol to make slurry, ceramic ion conductor powder: binder: mass ratio=10:1:30 of solvent, stir 1200min to obtain slurry, slurry is coat...

Embodiment 2

[0062] A composite solid electrolyte membrane, such as figure 2 As shown, there is a sandwich structure, including a PET separator 11 of an intermediate layer, a porosity of 70%, a pore size distribution of 120nm to 200nm, a thickness of 12 μm, and a solid polymer electrolyte 12 with a thickness of 0.5 μm coated on one side of the membrane ( The composition is PEO) and the solid polymer electrolyte 13 (the composition is PVDF) with a thickness of 0.8 μm on the other side; the ceramic ion conductor powder 14 with a particle size of 80 nm (the composition is Li 5 La 3 Ta 2 o 12 ) is anchored in the pores of the PET separator 11 through the binder PVDF, and the mass ratio of the ceramic ion conductor powder to the binder is 10:30.

[0063] 20nm inorganic particles 15 (composition of Li 7 La 3 Zr 2 o 12 ) Li 7 La 3 Zr 2 o 12 , the mass ratio of inorganic particles to solid polymer electrolyte is 97:30.

[0064] Its preparation method steps are as follows:

[0065] (1...

Embodiment 3

[0068] A composite solid electrolyte membrane with a sandwich structure, including a PI separator in the middle layer, with a porosity of 50%, a pore size distribution of 800nm ​​to 1μm, a thickness of 20μm, and a solid polymer coated on both sides of the membrane with a thickness of 1μm respectively Electrolyte PPC; ceramic ionic conductor powder Li with a particle size of 200nm x La 2 / 3-x TiO 3 The binder PEO is anchored in the pores of the base film, and the mass ratio of the ceramic ion conductor powder to the binder is 100:30.

[0069] Its preparation method steps are as follows:

[0070] (1) Ceramic ion conductor powder and binder are dispersed in solvent acetonitrile to make slurry, ceramic ion conductor powder: binder: the mass ratio=100:30:80 of solvent, stir 100min to obtain slurry, slurry is coated with Cover both sides of the base film, then roll it, scrape off the excess slurry on both sides, and dry it in vacuum at 80°C for 13 hours to obtain the intermediate ...

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Abstract

The invention relates to a composite solid electrolyte membrane and a preparation method and application thereof. The composite solid electrolyte membrane has a sandwich structure including a base membrane in an intermediate layer and solid polymer electrolytes coated on both sides of the base membrane. Ceramic ionic conductor powder is anchored in the pores of the base membrane by a binder. The invention utilizes the structural characteristic that the base film has certain pore distribution, the ceramic ionic conductor powder is embedded into the pores and anchored by the binder to form a stable integrated structure, which not only retains the original barrier effect, but also effectively improves the room temperature ionic conductivity and mechanical strength without destroying the flexibility of the diaphragm itself, and synthesizes the advantages of the diaphragm and the ceramic ionic conductor powder. The solid polymer electrolytes with ionic conductivity are coated on both sidesof the diaphragm to reduce the contact interface impedance between the diaphragm and positive and negative electrodes.

Description

technical field [0001] The invention relates to the technical field of energy storage materials, in particular to a composite solid electrolyte membrane and its preparation method and application. Background technique [0002] Due to its high energy density, high output power, high voltage, and low self-discharge, lithium batteries are currently widely used in electric vehicles, rail transit, large-scale energy storage, and aerospace fields. However, traditional lithium batteries use organic liquids as electrolytes, which are prone to side reactions with the electrodes during the charging and discharging process of the batteries, resulting in irreversible attenuation of battery capacity. In addition, traditional lithium-ion batteries cannot use metal lithium as the negative electrode. The advantages of using solid electrolytes instead of traditional organic liquids are: first, it can improve the energy density, safety and cycle performance of lithium-ion batteries; second, ...

Claims

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Application Information

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IPC IPC(8): H01M10/0565
CPCH01M10/0565Y02E60/10
Inventor 李彦灼王鑫王辉刘金成袁中直
Owner EVE ENERGY CO LTD
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