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Self-healing ionic gel with high ionic conductivity and preparation and application thereof

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

Active Publication Date: 2021-11-30
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Self-healing ionic gel with high ionic conductivity and preparation and application thereof
  • Self-healing ionic gel with high ionic conductivity and preparation and application thereof
  • Self-healing ionic gel with high ionic conductivity and preparation and application thereof

Examples

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Effect test

Embodiment 1

[0026] A method for preparing a self-healing ion gel with high ion conductivity, thermal stability and mechanical strength by blending PLA-b-PMMA diblock copolymers and ionic liquids, 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 into a self-made glass tube in an argon-protected glove box, vacuum After evacuating for 1 minute, seal the nozzle, polymerize at 130°C for 5 hours, then perform three cycles of chloroform dissolution-ethanol precipitation-suction filtration, and dry at 60°C for 3 days to obtain the prepolymer PLLA (PDLA). They are respectively recorded as PLLA-1 and PDLA-1, and the number 1 refers to the sample number;

[0029] 2) Take 2g of prepolymer PLA-1, 10g of methyl methacrylate, 5mg of cuprous chloride, 63μL of N,N,N',N",N"-pentamethyldiethylenetriamine and 10mL of Add dimethyl sulfoxid...

Embodiment 2

[0055] A kind of method utilizing PLA-b-PMMA diblock copolymer and ionic liquid blending to prepare high-performance ion gel, concrete 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 evacuating for 1 minute, seal the nozzle, polymerize at 130°C for 5 hours, then perform three cycles of chloroform dissolution-ethanol precipitation-suction filtration, and dry at 60°C for 3 days to obtain the prepolymer PLLA (PDLA). Denoted as PLLA-2 and PDLA-2, respectively;

[0058] 2) Take 1g of prepolymer PLA-2, 10g of methyl methacrylate, 1.7mg of cuprous chloride, 22μL of N,N,N',N",N"-pentamethyldiethylenetriamine and Add 10mL dimethyl sulfoxide into a 50mL Schlenk reaction flask, freeze-pump-thaw three times, react in a 90°C oil bath for...

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Abstract

The invention relates to a self-healing ionic gel with high ionic conductivity, thermal stability and excellent mechanical strength and a preparation method thereof, belonging to the field of gel polymer electrolytes. The ionic gel provided by invention is prepared from PLA-b-PMMA and an ionic liquid through a solution blending method, wherein a PLA section which is incompatible with the ionic liquid is self-assembled to form a crystal nucleus, and the PMMA section which is compatible with the ionic liquid plays a bridging role between the crystal nucleuses, so a network structure in which the crystal nucleuses are interspersed is formed. The novel ionic gel provided by the invention is improved in comprehensive performance such as ionic conductivity, mechanical strength and thermal stability, and has a self-repairing function.

Description

technical field [0001] The invention relates to a self-healing ion gel with high ion 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 polymer-wrapped ion gel electrolytes. 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 ion 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, solvents will ...

Claims

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Application Information

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Patent Type & Authority Applications(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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