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

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

Example Embodiment

[0034] Example 1.

[0035] Weigh 35g PPG ( Mn = 2000), added to a three-necked flask equipped with a stirrer, a thermometer, a vacuum system and an electric heating mantle, and dehydrated in a vacuum at 105 °C for 1 h. The temperature was lowered to 35°C, 10 g of TDI was added, and after the natural heating of the system stopped, the temperature was slowly raised to 70°C, and the reaction was maintained for 1.5 h.

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

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

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

Example Embodiment

[0039] Example 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 dehydrated in a vacuum at 100 °C for 1 h. The temperature was lowered to 30°C, 10 g of MDI was added, and after the natural heating of the system stopped, the temperature was slowly raised to 70°C, and the reaction was maintained for 1 h.

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

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

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

Example Embodiment

[0044] Example 3.

[0045] Weigh 45g PPG ( Mn = 3000), added to a three-necked flask equipped with a stirrer, a thermometer, a vacuum system and an electric heating mantle, and dehydrated in a vacuum at 110 °C for 1.5 h. The temperature was lowered to 40°C, 9 g of TDI was added, and after the natural heating of the system stopped, the temperature was slowly raised to 80°C, and the reaction was maintained for 2 hours.

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

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

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

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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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