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A polymer electrolyte based on surface initiation, its preparation and application

A polymer and electrolyte technology, applied in circuits, electrical components, secondary batteries, etc., can solve the problems of low electrolyte conductivity, poor mechanical properties, poor cycle performance, etc., to achieve poor mechanical properties, good mechanical properties, large The effect of adhesion

Active Publication Date: 2021-08-10
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This solves the technical problems of low conductivity, poor cycle performance, poor mechanical properties, and lithium dendrite growth of the polymer electrolyte in the prior art lithium-ion battery

Method used

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  • A polymer electrolyte based on surface initiation, its preparation and application
  • A polymer electrolyte based on surface initiation, its preparation and application
  • A polymer electrolyte based on surface initiation, its preparation and application

Examples

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preparation example Construction

[0044] A kind of preparation method of polymer electrolyte provided by the invention, such as figure 1 shown, including the following steps:

[0045] (1) The first monomer is mixed with an acid bromide reagent containing a bromine initiation site, and an esterification reaction occurs under conditions in the presence of a solvent and an acid-binding agent, and separation and purification after the reaction obtains a re-initiator containing a bromine active site;

[0046] (2) Mix the re-initiator described in step (1) with comonomer, cross-linking agent, initiator, chain transfer agent and organic solvent, and reversible addition-fragmentation chain transfer polymerization (RAFT reaction) occurs under oxygen-free conditions ), to obtain the first polymer; the surface of the first polymer contains active bromine initiation sites;

[0047] (3) Mix the first polymer obtained in step (2), the solvent and the second monomer, and use the active bromine sites on the surface of the fi...

Embodiment 1

[0095] This example provides a method for preparing a polymer electrolyte prepared by surface reinitiation polymerization, and the preparation method is as follows:

[0096] S1: Add magneton, 1.21mL hydroxyethoxy methacrylate, 6.95mL triethylamine, and 80mL dichloromethane into a 250mL single-necked flask, keep it in an ice bath for 15 minutes, add 1.3mL bromoisobutyryl bromide, and stir 1h, the temperature was raised to 30°C and stirring was continued for 10h. The reaction solution was evaporated to remove the solvent, 80 mL of ethyl acetate was added, the filtrate was collected by suction filtration, 100 mL of saturated sodium bicarbonate solution was added to the filtrate, stirred for 2 hours, extracted, anhydrous magnesium sulfate was added to dry, and the solvent was removed by distillation under reduced pressure. Chromatography gave a tan liquid, which was the reinitiator 2-((2-bromo-2-methylpropionyl)oxy)ethyl methacrylate.

[0097]S2: Under anhydrous and oxygen-free c...

Embodiment 2

[0103] This example provides a method for preparing a polymer electrolyte prepared by surface reinitiation polymerization, and the preparation method is as follows:

[0104] S1: Add magnetite, 1.21mL hydroxyethoxy acrylate, 6.95mL diethylamine, and 80mL tetrahydrofuran into a 250mL single-necked flask, keep warm in an ice bath for 15 minutes, add 1.3mL bromopropionyl bromide, stir for 1 hour, and heat up to 15 ° C to continue stirring for 16h. The reaction solution was evaporated under pressure to remove the solvent, 80 mL of ethyl acetate was added, the filtrate was collected by suction filtration, 100 mL of saturated sodium bicarbonate solution was added to the filtrate, stirred for 2 h, extracted, anhydrous magnesium sulfate was added to dry, the solvent was removed by distillation under reduced pressure, and the column Chromatography gave a tan liquid, which was the reinitiator 2-((2-bromopropionyl)oxy)ethyl acrylate.

[0105] S2: Under anhydrous and oxygen-free condition...

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Abstract

The invention belongs to the technical field of polymer electrolytes, and specifically discloses a polymer electrolyte prepared based on surface initiation, its preparation and application. By mixing a re-initiator containing bromine active sites with a comonomer, a crosslinking agent, an initiator, a chain transfer agent and an organic solvent, a RAFT reaction occurs under oxygen-free conditions to obtain a first polymer; and then using the The active bromine sites on the surface of the first polymer trigger the ATRP polymerization reaction of the second monomer to obtain the second polymer; the second polymer is mixed with the lithium salt to obtain the polymer electrolyte prepared based on the surface initiation. When the polymer electrolyte is applied to lithium batteries, its polymer network provides better mechanical support and has better mechanical properties. At the same time, the polymer network increases the amorphous content of the polymer electrolyte, thereby increasing the ion density of the electrolyte membrane. Conductivity and cycle performance of Li-ion batteries.

Description

technical field [0001] The invention belongs to the field of polymer electrolytes, and more specifically relates to a polymer electrolyte prepared based on surface initiation, its preparation and application. Background technique [0002] As an energy supply device with stable voltage, stable current, long-term stable power supply, and little external influence, battery has been extensively studied by people. Since the first commercialization of lithium batteries in 1991, due to its advantages of high energy density, high power density, high working voltage, no pollution, no memory effect, etc., it has been used in mobile phones, notebooks, digital cameras, gasoline-electric hybrid vehicles, It has been widely used in pure electric vehicles and energy storage equipment and other fields. [0003] In the past three decades, lithium-ion batteries using organic liquid electrolytes have achieved great success in portable electronics, but current lithium-ion batteries have bottle...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J7/16C08F220/18C08F220/28H01M10/0525H01M10/0565C08L33/08
CPCC08J7/16C08J2333/08C08F220/1804H01M10/0525H01M10/0565C08F220/282C08F220/286Y02E60/10
Inventor 薛志刚张永于丽平王计嵘解孝林周兴平
Owner HUAZHONG UNIV OF SCI & TECH
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