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A kind of three-dimensional cross-linked network gel polymer electrolyte membrane and its preparation method and application

A gel polymer, three-dimensional cross-linking technology, used in non-aqueous electrolytes, solid electrolytes, electrolyte immobilization/gelation, etc., can solve the problem of increasing the interface impedance between the polymer electrolyte and the electrode, reducing the specific energy density of the battery, reducing the ionic conductivity and other issues, to achieve the effect of promoting fast transport, improving mechanical properties, and increasing ionic conductivity

Active Publication Date: 2021-07-09
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially compared to the inorganic components with higher density of polymers, their introduction will reduce the specific energy density of the battery, and at the same time increase the interface resistance between the polymer electrolyte and the electrode; its non-porous and non-conducting lithium ion characteristics To a certain extent, it hinders the transmission of lithium ions and reduces its ionic conductivity.
Therefore, there are still significant challenges in preparing polymer electrolyte materials with both high ionic conductivity and high mechanical properties.

Method used

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  • A kind of three-dimensional cross-linked network gel polymer electrolyte membrane and its preparation method and application
  • A kind of three-dimensional cross-linked network gel polymer electrolyte membrane and its preparation method and application
  • A kind of three-dimensional cross-linked network gel polymer electrolyte membrane and its preparation method and application

Examples

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Embodiment 1

[0059] A method for preparing a three-dimensional crosslinked network gel polymer electrolyte membrane, comprising the following steps:

[0060] Step (1): Mix 12.25mL of 4-chloromethylstyrene and 0.25mL of divinylbenzene and inject it slowly into 248mL of deionized water with a micro-injection pump, heat up to 75°C after mixing, and weigh 0.21g Azobisisobutylamidine hydrochloride (V50 initiator) was dissolved in 2 mL of deionized water, injected into the reaction system with a needle, refluxed at 75°C for 4 hours under an inert atmosphere, washed with ethanol and water after centrifugation, and dried in vacuum at 40°C , to obtain an intermediate product one;

[0061] Step (2): Add 3.5 g of the intermediate product prepared in step (1) into 112 mL of 1,2-dichloroethane, stir slowly overnight to allow it to fully swell, raise the temperature to 80 ° C, and add 3.7 g of anhydrous trichloro Iron chloride was refluxed for 24 hours, then acetone / hydrochloric acid / water mixed solven...

Embodiment 2

[0079] A method for preparing a three-dimensional crosslinked network gel polymer electrolyte membrane, comprising the following steps:

[0080] Step (1): Mix 12.25mL of 4-chloromethylstyrene and 0.25mL of divinylbenzene and inject it slowly into 248mL of deionized water with a micro-injection pump, heat up to 75°C after mixing, and weigh 0.21g Azobisisobutylamidine hydrochloride (V50 initiator) was dissolved in 2 mL of deionized water, injected into the reaction system with a needle, refluxed at 75°C for 4 hours under an inert atmosphere, washed with ethanol and water after centrifugation, and dried in vacuum at 40°C , to obtain an intermediate product one;

[0081] Step (2): Add 3.5 g of the intermediate product prepared in step (1) into 112 mL of 1,2-dichloroethane, stir slowly overnight to allow it to fully swell, raise the temperature to 80 ° C, and add 3.7 g of anhydrous trichloro Iron chloride was refluxed for 24 hours, then acetone / hydrochloric acid / water mixed solven...

Embodiment 3

[0086] A method for preparing a three-dimensional crosslinked network gel polymer electrolyte membrane, comprising the following steps:

[0087] Step (1): Mix 12.25mL of 4-chloromethylstyrene and 0.25mL of divinylbenzene and inject it slowly into 248mL of deionized water with a micro-injection pump, heat up to 75°C after mixing, and weigh 0.21g Azobisisobutylamidine hydrochloride (V50 initiator) was dissolved in 2 mL of deionized water, injected into the reaction system with a needle, refluxed at 75°C for 4 hours under an inert atmosphere, washed with ethanol and water after centrifugation, and dried in vacuum at 40°C , to obtain an intermediate product one;

[0088] Step (2): Add 3.5 g of the intermediate product prepared in step (1) into 112 mL of 1,2-dichloroethane, stir slowly overnight to allow it to fully swell, raise the temperature to 80 ° C, and add 3.7 g of anhydrous trichloro Iron chloride was refluxed for 24 hours, then acetone / hydrochloric acid / water mixed solven...

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Abstract

The invention discloses a three-dimensional cross-linked network gel polymer electrolyte membrane and its preparation method and application. Firstly, polychloromethylstyrene nanospheres are synthesized by emulsion polymerization, and then super-cross-linked reaction occurs to obtain super-cross-linked microspheres. Porous polychloromethylstyrene nanospheres (xPCMS); then use the benzyl chloride of xPCMS as the active grafting site to graft polyglycidyl methacrylate on the surface of xPCMS to prepare hair-like microporous polymer nanospheres ; secondly, using nanospheres as a cross-linking agent to react with polyoxyethylene diamine and polyethylene glycol diglycidyl ether to prepare a three-dimensional cross-linked network gel polymer film; finally, soak the obtained polymer film After the liquid electrolyte is adsorbed and saturated, a three-dimensional cross-linked network gel polymer electrolyte membrane is obtained. The electrolyte membrane of the invention has excellent mechanical properties, high room temperature ionic conductivity and good thermal stability, and the assembled lithium ion battery has excellent electrochemical properties.

Description

technical field [0001] The invention relates to the field of polymer gel electrolyte materials for lithium secondary batteries, in particular to a three-dimensional cross-linked network gel polymer electrolyte membrane based on hair-like microporous polymer nanospheres and a preparation method thereof, and the application of the three-dimensional Lithium-ion batteries with cross-linked network gel polymer electrolyte membranes. Background technique [0002] With the rapid development of industries such as electric vehicles, smart grids, and portable electronic equipment, people's demand for energy storage devices with high energy density and high safety is increasing. Among various battery systems, lithium metal has the highest theoretical specific capacity (3860mAh g -1 ) and the lowest redox electrode potential (-3.040V vs. standard hydrogen electrode), so it is widely regarded as the "holy grail" in the energy field, and is expected to become the anode material for the n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0565H01M10/0525C08F257/00C08F220/32
CPCC08F257/00H01M10/0525H01M10/0565H01M2300/0082H01M2300/0085C08F220/325Y02E60/10Y02P20/584
Inventor 吴丁财李始美刘绍鸿符若文
Owner SUN YAT SEN UNIV
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