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A kind of flame retardant polyethylene oxide solid electrolyte membrane

A solid electrolyte membrane, polyethylene oxide technology, used in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, circuits, etc., can solve problems such as easy combustion, hidden dangers, fire and even explosion, reduce crystallinity, solve easy problems, etc. Combustion problem, the effect of improving ionic conductivity

Active Publication Date: 2022-05-27
JIANGHAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Traditional lithium-ion battery electrolytes generally use flammable carbonate solvents. Once thermal runaway occurs due to overcharge, overdischarge, extrusion, impact or short circuit, safety accidents such as fire or explosion will occur
Lithium-ion batteries using all-solid-state polymer electrolytes have significantly improved safety due to the absence of electrolyte volatilization and leakage. Polyethylene oxide is the most common solid-state polymer electrolyte, but its limiting oxygen index Only about 16%, it is very easy to burn in the air, once the battery thermal runaway, there is also a safety hazard

Method used

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  • A kind of flame retardant polyethylene oxide solid electrolyte membrane
  • A kind of flame retardant polyethylene oxide solid electrolyte membrane
  • A kind of flame retardant polyethylene oxide solid electrolyte membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] 1. Weigh 1.0g polyethylene oxide (molecular weight 4*10 5 ), 0.2g of ethylene glycol methylpropionate phosphonate and 0.25g of lithium bistrifluoromethanesulfonimide were added to a 100ml pear-shaped flask containing 15g of anhydrous dichloromethane, and a rubber stopper was used. The pear-shaped flask was sealed, and the pear-shaped flask was placed under normal temperature with magnetic stirring for 3 hours to obtain a coating liquid with a solid content of 8.81%. The above operations were all carried out in a glove box filled with argon;

[0045] 2. Use a 400um film applicator to flatly push the coating liquid on a clean glass plate to form a film, place the glass plate in an oven, vacuum dry at 50°C for 2 hours, and peel it off carefully to obtain a solid state of flame-retardant polyethylene oxide. For the electrolyte membrane (referred to as FR1-PEO-LiTFSI), the obtained electrolyte membrane was cut into a disc shape with a diameter of 16 mm by a laminator, and wa...

Embodiment 2

[0049] 1. Weigh 1.0g polyethylene oxide (molecular weight 4*10 5 ), 0.4g of ethylene glycol methylpropionate phosphonate and 0.25g of lithium bistrifluoromethanesulfonimide were added to a 100ml pear-shaped flask containing 15g of anhydrous dichloromethane, and a rubber stopper was used. The pear-shaped flask was sealed, and the pear-shaped flask was placed under normal temperature with magnetic stirring for 3 hours to obtain a coating liquid with a solid content of 9.91%. The above operations were all carried out in a glove box filled with argon;

[0050] 2. Use a 400um film applicator to flatly push the coating liquid on a clean glass plate to form a film, place the glass plate in an oven, vacuum dry at 50°C for 2 hours, and peel it off carefully to obtain a solid state of flame-retardant polyethylene oxide. For the electrolyte membrane (FR2-PEO-LiTFSI), the obtained electrolyte membrane was cut into a disc shape with a diameter of 16 mm with a laminator, and was placed in a...

Embodiment 3

[0064] 1. Weigh 1.0g polyethylene oxide (molecular weight 4*10 5 ), 0.4g of ethylene glycol methylpropionate phosphonate and 0.3g of lithium bistrifluoromethanesulfonimide were added to a 100ml pear-shaped flask containing 15g of anhydrous dichloromethane, and a rubber stopper was used. The pear-shaped flask was sealed, and the pear-shaped flask was placed under normal temperature with magnetic stirring for 3 hours to obtain a coating liquid with a solid content of 10.18%. The above operations were all carried out in a glove box filled with argon;

[0065] 2. Use a 400um film applicator to flatly push the coating liquid on a clean glass plate to form a film, place the glass plate in an oven, vacuum dry at 50°C for 2 hours, and peel it off carefully to obtain a solid state of flame-retardant polyethylene oxide. For the electrolyte membrane, the obtained electrolyte membrane was cut into a disc shape with a diameter of 16 mm with a film laminator, and was placed in a glove box f...

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Abstract

The invention discloses a flame-retardant polyethylene oxide solid electrolyte membrane, which is prepared by the following method: 1. In an inert gas environment, polyethylene oxide, flame retardant and lithium salt are added to a solvent Among them, the flame retardant is a phosphonate with a dihydric hydroxyl structure, which is stirred and dissolved to obtain a coating solution; 2. Coating the coating solution on a clean carrier to form a film layer, drying the film layer to evaporate the solvent, After drying, it is peeled off to obtain the flame-retardant polyethylene oxide solid electrolyte membrane. The flame-retardant solid-state electrolyte membrane has good self-extinguishing property when away from fire, and improves the ion conductivity of the polymer electrolyte membrane while improving the safety performance.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a flame-retardant polyethylene oxide solid electrolyte membrane. Background technique [0002] Lithium-ion batteries are widely used in portable electronic devices, new energy vehicles, aerospace and other fields due to their high energy density, high output voltage, long cycle life and low environmental pollution. However, reports of safety accidents caused by lithium-ion batteries are common in recent years, which has aroused great concern about the safety performance of lithium-ion batteries. [0003] Traditional lithium-ion battery electrolytes generally use flammable carbonate solvents. Once thermal runaway occurs due to overcharge, overdischarge, extrusion, impact or short circuit, safety accidents such as fire or even explosion will occur. Lithium-ion batteries using all-solid-state polymer electrolytes have significantly improved safety due to the absence o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/22C08L71/02C08K5/5313C08K5/435C08K3/32C08K3/24H01M10/0525H01M10/0565H01M10/058H01M10/42A62C3/16
CPCC08J5/2275H01M10/0565H01M10/058H01M10/0525H01M10/4235A62C3/16C08J2371/02C08K5/5313C08K5/435C08K3/32C08K3/24Y02E60/10Y02P70/50
Inventor 陈佳刘继延刘学清
Owner JIANGHAN UNIVERSITY