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A kind of cross-linking polymerization preparation method of polyionic liquid solid state electrolyte

A solid electrolyte, polyionic liquid technology, applied in solid electrolytes, non-aqueous electrolytes, circuits, etc., can solve problems such as complex preparation process, and achieve the effects of simple and mild synthesis conditions, stable electrochemical properties, and good cycle stability.

Active Publication Date: 2020-06-02
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation process is more complex

Method used

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  • A kind of cross-linking polymerization preparation method of polyionic liquid solid state electrolyte
  • A kind of cross-linking polymerization preparation method of polyionic liquid solid state electrolyte
  • A kind of cross-linking polymerization preparation method of polyionic liquid solid state electrolyte

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Embodiment 1

[0023] This embodiment includes the following steps:

[0024] (1), Weigh 5g of polyethylene oxide PEO and add it to a round bottom flask, then add 110mL of acetonitrile and 5g of 1-vinyl-3-methylimidazole bistrifluoromethanesulfonimide [VMIM]TFSI monomer, after stirring Add 1.1 g lithium bistrifluoromethanesulfonimide LiTFSI, stir for 5 hours to obtain a mixed solution;

[0025] (2), add the polyethylene glycol diacrylate PEGDA of 3.7g in the mixed liquor that step (1) prepares as crosslinking agent and initiator azobisisobutyronitrile AIBN0.1g, stir; It is heated, The cross-linking polymerization reaction temperature is 70°C, and the reaction time is 24 hours;

[0026] (3) After the reaction system in step (2) was cooled to room temperature, the obtained polyionic liquid solid electrolyte was vacuum-dried at 80° C. for 48 hours, and punched into discs with a diameter of 1.9 cm by a tablet machine for later use. Optical photos of the appearance of the electrolyte and flexibl...

Embodiment 2

[0032] This embodiment includes the following steps:

[0033] (1) Weigh 6.7g of PEO into a round bottom flask, add 125mL of acetonitrile and 3.3g of 1-vinyl-3-methylimidazole bistrifluoromethanesulfonimide [VMIM]TFSI monomer, stir with magnetic force After stirring, add 1.1 g of lithium bistrifluoromethanesulfonimide LiTFSI, and stir for 5 hours to obtain a mixed solution;

[0034] (2), add 2.5g of polyethylene glycol diacrylate PEGDA to the mixed solution prepared in step (1) as crosslinking agent and initiator azobisisobutyronitrile AIBN 0.07g, stir, it is heated, The cross-linking polymerization reaction temperature is 73°C, and the reaction time is 24 hours;

[0035](3) After the reaction system in step (2) was cooled to room temperature, the obtained polyionic liquid solid electrolyte was vacuum-dried at 80° C. for 48 hours, and punched into discs with a diameter of 1.9 cm by a tablet machine for later use. Optical photos of the appearance of the electrolyte and flexibl...

Embodiment 3

[0037] This embodiment includes the following steps:

[0038] (1), weigh 7.8g polyethylene oxide PEO and join in the round bottom flask, add acetonitrile 150mL and 2.2g 1-vinyl-3-methylimidazole bistrifluoromethanesulfonimide [VMIM]TFSI monomer, use Stir with a magnetic stirrer, add 1.1 g of lithium bistrifluoromethanesulfonimide LiTFSI, and stir for 5 hours to obtain a mixed solution;

[0039] (2), add 1.6g of polyethylene glycol diacrylate PEGDA to the mixed solution prepared in step (1) as crosslinking agent and initiator azobisisobutyronitrile AIBN 0.05g, stir, it is heated, The cross-linking polymerization reaction temperature is 75°C, and the reaction time is 24 hours;

[0040] (3) After the reaction system in step (2) was cooled to room temperature, the obtained polyionic liquid solid electrolyte was vacuum-dried at 80° C. for 48 hours, and punched into discs with a diameter of 1.9 cm by a tablet machine for later use. Optical photos of the appearance of the electroly...

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Abstract

The invention discloses a cross-linking polymerization method for preparing a solid electrolyte of a polyionic liquid. The method comprises the steps: selecting highly-hydrophobic and small-viscosityionic liquid 1-vinyl-3-methylimidazole bistrifluoromethanesulfimide salt as a monomer, dissolving the monomer in a polyoxyethylene and lithium salt system, adding a cross-linking agent and an initiator, performing stirring and heating at room temperature, performing initiation through free radicals, and performing in-situ polymerization so as to obtain a cross-linked polymerization product. The self-supporting effect of the polyionic liquid in the cross-linking copolymerization system is given play to, the polyionic liquid becomes a flexible electrolyte membrane, and meanwhile based on own conductivity the polyionic liquid, the overall conductivity of the system is improved, so that the obtained membrane is suitable for lithium ion batteries. The electrolyte is a solid polymer electrolyte,the polyionic liquid is a hardly-volatile substance, and has a self-supporting effect, and therefore the mechanical properties of the electrolyte are increased; and meanwhile the application temperature range of the batteries is widened, the conductivity is increased, and cycles of charging and discharging can still be performed stably at high temperatures.

Description

technical field [0001] The invention belongs to the technical field of solid electrolyte preparation, in particular to a method for preparing a polyionic liquid solid electrolyte by cross-linking polymerization. Background technique [0002] Lithium-ion batteries are energy storage systems with great potential. Organic liquid electrolytes are commonly used in lithium-ion batteries, but leakage, drying up, and flammability and explosion are still serious safety issues when working at high temperatures. For the reasons above, polymer electrolytes are ideal alternatives for working at high temperatures. Polymer electrolytes have good mechanical properties, flexibility, and good encapsulation. Among them, polyethylene oxide (referred to as: PEO) is widely used. However, a common problem with polymers is their high degree of crystallinity, which leads to their low electrical conductivity. Therefore, reducing the crystallinity of polymers while increasing electrical conductivi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F226/06H01M10/0525H01M10/0565
CPCC08F283/065H01M10/0525H01M10/0565H01M2300/0082C08F226/06Y02E60/10
Inventor 丁书江李宇寒孙宗杰张彦峰朱敏
Owner XI AN JIAOTONG UNIV
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