Cross-linking modified polyethyleneimine solid electrolyte and application thereof

A technology of solid electrolyte and polyethyleneimine, which is applied in the direction of solid electrolyte, composite electrolyte, non-aqueous electrolyte, etc., can solve the problems of poor thermal stability, poor film-forming property, and low conductivity, so as to reduce the internal resistance of the battery and improve the cost. Membrane properties, the effect of improving the service life

Active Publication Date: 2019-07-30
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a cross-linked polymer solid electrolyte and its application, which solves the problems of low ion conductivity, poor film-forming property and poor thermal stability of existing polymer solid electrolytes

Method used

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  • Cross-linking modified polyethyleneimine solid electrolyte and application thereof
  • Cross-linking modified polyethyleneimine solid electrolyte and application thereof
  • Cross-linking modified polyethyleneimine solid electrolyte and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0044] Step (1) Synthesis of modified polyethyleneimine: 4 g of polyethyleneimine and 4.45 g of absolute ethanol were weighed with an electronic balance. Wherein, polyethyleneimine is polyethyleneimine aqueous solution, and the number average molecular weight is 20000. The polyethyleneimine and absolute ethanol were placed in a three-neck flask with a vent valve, wherein a condenser was connected to the three-necked flask and a thermometer was inserted to form a reactor. Pass argon into the flask and stir with a magnetic stirrer for more than 2 hours. After stirring evenly, add 0.45g of acrylonitrile with a syringe, raise the temperature in the reaction flask to 60°C, stir at 500rmp, and react for 12 hours to obtain acrylonitrile-modified Polyethyleneimine (CN-PEI);

[0045] Step (2) preparation of crosslinked polymer solid state electrolyte: weigh modified polyethyleneimine, lithium salt and crosslinking agent with electronic balance, wherein, the modification ratio of polye...

Embodiment 2

[0058] Step (1) is the same as step (1) of embodiment 1, the difference lies in step (2).

[0059] Step (2) preparation of crosslinked polymer solid state electrolyte: weigh modified polyethyleneimine, lithium salt and crosslinking agent with electronic balance, wherein, the modification ratio of polyethyleneimine is 1:2, lithium salt ( The quality of LiTFSI) is 10% of the total mass of modified polyethyleneimine, lithium salt and crosslinking agent, and the quality of crosslinking agent (Aa) is 8% of the total mass of modified polyethyleneimine, lithium salt and crosslinking agent %. And stir evenly with a magnetic stirrer at room temperature; pour the mixed solution into a polytetrafluoroethylene mold, and perform drying and crosslinking under a certain heating program. The heating program is: first gradually heat up to 85°C, the heating rate is 5°C / h, and finally transferred to a vacuum drying oven, the temperature is 110°C, and the holding time is 2h. After cooling, the ...

Embodiment 3

[0064] Step (1) Synthesis of modified polyethyleneimine: Weigh 4 g of polyethyleneimine and 4.45 g of deionized water with an electronic balance, wherein the polyethyleneimine is an aqueous solution of polyethyleneimine with a number average molecular weight of 5000. Put polyethyleneimine and deionized water in a three-necked bottle with a vent valve, connect a condenser tube to the three-necked bottle and insert a thermometer to form a reactor. After passing through argon and stirring for 2 hours, add 0.65 g of acrylic acid with a syringe, increase the temperature in the reaction bottle to 55 ° C, and continue stirring at a speed of 800 rpm for 10 hours to obtain acrylic acid-modified polyethyleneimine (N-CEPEI); The molar ratio of repeating units of ethyleneimine to modifying monomers is 1:3.

[0065] Step (2) preparation of cross-linked polymer solid electrolyte: weigh modified polyethyleneimine, lithium salt and crosslinking agent with electronic balance, wherein, the modi...

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Abstract

The invention discloses a cross-linking polymer solid electrolyte. Raw materials of the cross-linking polymer solid electrolyte comprise modified polyethyleneimine, a cross-linking agent and lithium salt. An interpenetrating network material is formed by heating and cross-linking reaction of the modified polyethyleneimine, the cross-linking agent and the lithium salt. The cross-linking polymer solid electrolyte has high thermal stability, high ionic conductivity and a high electrochemical window, and can be widely applied in electrochemical energy storage devices such as lithium ion batteries,supercapacitors and solar batteries.

Description

[0001] Technical field: [0002] The invention relates to a cross-linked polymer solid state electrolyte and a preparation method thereof. [0003] Background technique: [0004] At present, with the rapid development of mobile electronic devices, electric vehicles and energy storage grid systems, people have higher and higher requirements for the performance and safety of lithium-ion batteries. As an essential part of lithium-ion batteries, electrolyte plays a role in transporting lithium ions between the positive and negative electrodes of the battery, and has a profound impact on the performance and safety of lithium-ion batteries. However, most of the electrolytes in lithium-ion batteries widely used at present contain flammable, explosive, volatile, and easy-to-leak carbonate organic solvents, which make lithium-ion batteries have certain safety hazards. In order to make lithium-ion batteries meet the requirements of safety and environmental protection, solid-state electr...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01G11/56H01G9/20C08G73/04C08F283/00C08F222/20C08J3/24C08L79/02
CPCC08F283/00C08G73/0206C08J3/24H01G9/2009H01G11/56H01M10/0565H01M2300/0082H01M2300/0085H01M2300/0088C08F222/102Y02E10/542Y02E60/10Y02E60/13
Inventor 张灵志方应军
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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