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Castable polyurethane elastomer electrolyte and preparation method thereof

A polyurethane elastomer, electrolyte technology, applied in the direction of electrolyte immobilization/gelation, circuits, electrical components, etc., can solve the problems of low ionic conductivity at room temperature, poor mechanical properties and thermal stability, etc., to achieve good physical properties, good Comprehensive performance, high-strength effect

Inactive Publication Date: 2020-04-03
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a preparation method of cast polyurethane elastomer electrolyte to solve the problems of low room temperature ionic conductivity, poor mechanical properties and thermal stability of the currently prepared polymer solid electrolytes

Method used

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  • Castable polyurethane elastomer electrolyte and preparation method thereof
  • Castable polyurethane elastomer electrolyte and preparation method thereof
  • Castable polyurethane elastomer electrolyte and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Weigh 35g PPG ( mn =2000), put into a three-necked flask equipped with a stirrer, a thermometer, a vacuum system and an electric heating mantle, and dehydrate under vacuum at 105°C for 1h. Cool down to 35°C, add 10g of TDI, after the natural temperature rise of the system stops, slowly raise the temperature to 70°C, and keep the reaction for 1.5h.

[0036] The reactant was lowered to room temperature, 11g LITFSI dissolved in 1g DMC was added, and the prepolymer was obtained after stirring for 90min to be fully uniform.

[0037] At room temperature, add pre-dehydrated 1g BDO, 2g DOP and 1g DBTL to the prepolymer prepared above, stir rapidly for 3min, and quickly put it into a vacuum device for degassing for 30s.

[0038]The mixture was quickly poured into molds coated with release agent and cured at room temperature for 7 days.

Embodiment 2

[0040] Weigh 40g PPG ( mn =1500), put it into a three-necked flask equipped with a stirrer, a thermometer, a vacuum system and an electric heating mantle, and dehydrate under vacuum at 100°C for 1h. Cool down to 30°C, add 10g of MDI, after the natural temperature rise of the system stops, slowly raise the temperature to 70°C, and keep the reaction for 1h.

[0041] The reactant was lowered to room temperature, 16g LITFSI dissolved in 2g DMC was added, and the prepolymer was obtained after stirring for 100min to be fully uniform.

[0042] At room temperature, add pre-dehydrated 2g BDO, 3g DOP and 2g DBTL to the prepolymer prepared above, stir rapidly for 3min, and quickly put it into a vacuum device for degassing for 50s.

[0043] The mixture was quickly poured into molds coated with release agent and cured at room temperature for 7 days.

Embodiment 3

[0045] Weigh 45g PPG ( mn =3000), put into a three-necked flask equipped with a stirrer, a thermometer, a vacuum system and an electric heating mantle, and vacuum dehydrate at 110°C for 1.5h. Cool down to 40°C, add 9g of TDI, after the natural temperature rise of the system stops, slowly raise the temperature to 80°C, and keep the reaction for 2h.

[0046] The reactant was lowered to room temperature, 20g LITFSI dissolved in 2.5g DMC was added, and the prepolymer was obtained after stirring for 200min to be fully uniform.

[0047] At room temperature, add pre-dehydrated 2.5g BDO, 4g DOP and 2.5g DBTL to the prepolymer prepared above, stir rapidly for 3min, and quickly put it into a vacuum device for degassing for 60s.

[0048] The mixture was quickly poured into molds coated with release agent and cured at room temperature for 8 days.

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Abstract

The invention discloses a preparation method of a castable polyurethane elastomer electrolyte, which comprises the following steps: preparing a prepolymer by using a polyether glycol and a diisocyanate as raw materials by adopting a prepolymer method, mixing the prepolymer with a lithium salt to carry out complexation reaction, reacting with a chain extender to prepare the castable polyurethane elastomer electrolyte, and curing and molding at room temperature. The castable polyurethane elastomer electrolyte prepared by the method has good mechanical properties and physical properties, has highelasticity, high strength and high elongation, is suitable for flexible device materials, and has room-temperature ionic conductivity greater than or equal to 10 <-7 > S / cm and ionic conductivity greater than or equal to 10 <-4 > S / cm at 60 DEG C.

Description

technical field [0001] The invention belongs to the field of preparation of flexible lithium-ion batteries, and relates to a polymer solid-state electrolyte material for lithium-ion batteries, in particular to a method for preparing a cast polyurethane elastomer electrolyte. Background technique [0002] At present, large-scale commercialized lithium secondary batteries contain a large amount of organic carbonate liquid electrolyte. Due to its low boiling point and flammability, it is easy to cause deformation or even electrolyte leakage when it is squeezed and collided during use, thereby It may cause the battery to burn or explode, posing a major safety hazard. Frequent battery explosions while charging mobile phones, spontaneous combustion of electric vehicles and other accidents have sharply revealed a series of performance and safety problems in the current lithium-ion battery liquid electrolyte. [0003] Solid electrolytes overcome the problems of liquid electrolytes ...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/10C08G18/48C08G18/32H01M10/0525H01M10/0565
CPCC08G18/10C08G18/4825C08G18/4854C08G18/6674H01M10/0525H01M10/0565H01M2300/0085C08G18/3206Y02E60/10
Inventor 张伟玄武钰铃赵浩成李雪锋王米穴王华
Owner TAIYUAN UNIV OF TECH
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