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Flame-retardant polyethylene oxide solid electrolyte membrane

A solid-state electrolyte membrane, polyethylene oxide technology, applied in the field of lithium-ion batteries, can solve problems such as hidden safety hazards, flammability, fire and even explosion, and can reduce crystallinity, solve flammability problems, and improve ionic conductivity. Effect

Active Publication Date: 2021-04-09
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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  • Flame-retardant polyethylene oxide solid electrolyte membrane
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  • 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 ethylene glycol methpropionate, ethylene glycol phosphonate and 0.25g lithium bistrifluoromethanesulfonimide were added to a 100ml pear-shaped flask filled with 15g anhydrous dichloromethane, and a rubber stopper was used to Seal the pear-shaped flask, and place the pear-shaped flask under normal temperature for 3 hours to magnetically stir to obtain a coating solution with a solid content of 8.81%. The above-mentioned operations are all carried out in a glove box filled with argon;

[0045] 2. Use a 400um film applicator to push the coating solution on a clean glass plate to form a film, put the glass plate in an oven, dry it in vacuum at 50°C for 2 hours, and peel it off carefully to obtain a solid flame-retardant polyethylene oxide Electrolyte membrane (denoted as FR1-PEO-LiTFSI), the obtained electrolyte membrane was cut into discs with a diameter of 16 mm by a film pressing machine, and placed in a g...

Embodiment 2

[0049] 1. Weigh 1.0g polyethylene oxide (molecular weight 4*10 5 ), 0.4g ethylene glycol methyl propionate, ethylene glycol phosphonate and 0.25g lithium bistrifluoromethanesulfonyl imide were added to a 100ml pear-shaped flask filled with 15g anhydrous dichloromethane, with a rubber stopper Seal the pear-shaped flask, and place the pear-shaped flask at room temperature for 3 hours to magnetically stir to obtain a coating solution with a solid content of 9.91%. The above-mentioned operations are all carried out in a glove box filled with argon;

[0050] 2. Use a 400um film applicator to push the coating solution on a clean glass plate to form a film, put the glass plate in an oven, dry it in vacuum at 50°C for 2 hours, and peel it off carefully to obtain a solid flame-retardant polyethylene oxide Electrolyte membrane (FR2-PEO-LiTFSI), the obtained electrolyte membrane was cut into discs with a diameter of 16 mm by a film pressing machine, and placed in a glove box for standby....

Embodiment 3

[0064] 1. Weigh 1.0g polyethylene oxide (molecular weight 4*10 5 ), 0.4g ethylene glycol methpropionate, ethylene glycol phosphonate and 0.3g lithium bistrifluoromethanesulfonylimide were added to a 100ml pear-shaped flask filled with 15g anhydrous dichloromethane, and a rubber stopper Seal the pear-shaped flask, and place the pear-shaped flask under normal temperature for 3 hours to magnetically stir to obtain a coating solution with a solid content of 10.18%. The above-mentioned operations are all carried out in a glove box filled with argon;

[0065] 2. Use a 400um film applicator to push the coating solution on a clean glass plate to form a film, put the glass plate in an oven, dry it in vacuum at 50°C for 2 hours, and peel it off carefully to obtain a solid flame-retardant polyethylene oxide For the electrolyte membrane, the obtained electrolyte membrane was cut into discs with a diameter of 16 mm by a film pressing machine, and placed in a glove box for subsequent use. ...

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Abstract

The invention discloses a flame-retardant polyethylene oxide solid electrolyte membrane. A method for preparing the solid electrolyte membrane comprises the following steps: 1, in an inert gas environment, adding polyethylene oxide, a flame retardant and a lithium salt into a solvent and conducting stirring for dissolving to obtain a coating solution, wherein the flame retardant is phosphonate with a binary hydroxyl structure; and 2, coating a clean carrier with the coating solution to form a film layer, drying the film layer to volatilize the solvent, and stripping the film layer after drying to obtain the flame-retardant polyethylene oxide solid electrolyte membrane. The flame-retardant solid electrolyte membrane has good off-fire self-extinguishing property, and the ionic conductivity of the polymer electrolyte membrane is improved while safety performance is improved.

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, in recent years, there have been frequent reports of safety accidents caused by lithium-ion batteries, which has aroused people's high attention to 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 explosion will occur. Lithium-ion batteries using all-solid-state polymer electrolytes have significantly improved safety due...

Claims

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Application Information

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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