A self-healing ionic gel with high ionic conductivity and its preparation and application

A technology of ion gel and ionic liquid, which is applied in the field of self-healing ion gel and its preparation, can solve the problems of difficult degradation of fluorine-containing materials, environmental pollution, poor mechanical properties and thermal stability, etc.

Active Publication Date: 2022-07-15
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, homopolymers such as PEO and other doped electrolytes have high ionic conductivity, but their mechanical properties and thermal stability are poor; copolymers such as P(VDF-HFP), etc., the crystalline segment of PVDF maintains the mechanical strength of the material , the amorphous segment PHFP wraps the liquid electrolyte to obtain a higher performance ion gel
However, fluorine-containing materials are difficult to degrade, cause serious environmental pollution, and have the danger of organic electrolytes

Method used

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  • A self-healing ionic gel with high ionic conductivity and its preparation and application
  • A self-healing ionic gel with high ionic conductivity and its preparation and application
  • A self-healing ionic gel with high ionic conductivity and its preparation and application

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Embodiment 1

[0026] A method for preparing a self-healing ionic gel with high ionic conductivity, excellent thermal stability and excellent mechanical strength by using PLA-b-PMMA diblock copolymer and ionic liquid blending, the specific steps are as follows:

[0027] 1. Synthesis of diblock copolymers PLLA-b-PMMA and PDLA-b-PMMA

[0028] 1) Add 0.149g of 2,2,2-trichloroethanol, 10g of L-lactide (D-lactide) and 8 μL of stannous isooctanoate to a self-made glass tube in an argon-protected glove box, vacuum After 1 minute of pumping, the nozzle was melted and polymerized at 130°C for 5h, and then three cycles of chloroform dissolution-ethanol precipitation-suction filtration were performed, and the prepolymer PLLA (PDLA) was obtained after vacuum drying at 60°C for 3 days. They are denoted as PLLA-1 and PDLA-1 respectively, and the number 1 refers to the sample number;

[0029] 2) Take 2g prepolymer PLA-1, 10g methyl methacrylate, 5mg cuprous chloride, 63μL N,N,N',N",N"-pentamethyldiethylen...

Embodiment 2

[0055] A method for preparing high-performance ionic gel by blending PLA-b-PMMA diblock copolymer and ionic liquid, the specific steps are as follows:

[0056] 1. Synthesis of high molecular weight diblock copolymers PLLA-b-PMMA and PDLA-b-PMMA

[0057] 1) Add 0.025g of 2,2,2-trichloroethanol, 10g of L-lactide (D-lactide) and 8 μL of stannous isooctanoate into a self-made glass tube in an argon-protected glove box, vacuum After 1 minute of pumping, the nozzle was melted and polymerized at 130°C for 5h, and then three cycles of chloroform dissolution-ethanol precipitation-suction filtration were performed, and the prepolymer PLLA (PDLA) was obtained after vacuum drying at 60°C for 3 days. Denoted as PLLA-2 and PDLA-2, respectively;

[0058] 2) Take 1 g of prepolymer PLA-2 in step 1, 10 g of methyl methacrylate, 1.7 mg of cuprous chloride, 22 μL of N,N,N',N",N"-pentamethyldiethylenetriamine and 10 mL of dimethyl sulfoxide was added to a 50 mL Schlenk reaction flask, and after ...

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Abstract

The invention relates to a self-healing ion gel with high ionic conductivity, excellent thermal stability and mechanical strength and a preparation method thereof, belonging to the field of gel polymer electrolytes. The present invention provides an ionic gel prepared by solution blending PLA-b-PMMA and ionic liquid; wherein, the PLA segment incompatible with the ionic liquid self-assembles to form a crystal nucleus, The ionic liquid-compatible PMMA segment acts as a bridge between the crystal nuclei, forming a network structure interspersed with crystal nuclei. The present invention provides a novel ion gel whose comprehensive properties such as ionic conductivity, mechanical strength and thermal stability are improved and self-healing function is provided.

Description

technical field [0001] The invention relates to a self-healing ion gel with high ionic conductivity, excellent thermal stability and mechanical strength and a preparation method thereof, belonging to the field of gel polymer electrolytes. Background technique [0002] Gel polymer electrolytes belong to the second category of polymer electrolytes, which can be understood as ionic gel electrolytes wrapped by polymers. Compared with traditional liquid electrolytes, there are no defects such as internal short circuits and electrolyte leakage. In recent years, it has received extensive attention from researchers. However, due to the low ionic conductivity of polymers and the poor mechanical and thermal stability of ionic gels, we need to modify gel polymer electrolytes for practical applications. In addition, the electrolytes traditionally used in ion gel systems are usually composed of polar organic solvents and electrolyte salts. In all-solid-state energy storage devices, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J3/09C08L53/00H01L51/42H01M10/0525H01M10/0565
CPCC08J3/096H01M10/0565H01M10/0525C08J2353/00H10K30/10Y02E10/549
Inventor 牛艳华李文泽
Owner SICHUAN UNIV
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