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High-conductivity semi-interpenetrating polymer electrolyte containing ionic liquid cross-linking agent

An ionic liquid, high conductivity technology, applied in the field of electrochemistry, can solve the problems of complex polymer process, difficult to have good compatibility of various substances, etc., to improve crystallinity and amorphous region, good application prospects, The effect of improving electrochemical performance

Pending Publication Date: 2022-05-13
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the use of ex-situ methods will make it difficult for the various substances of this semi-interpenetrating complex system to have good compatibility, and the multi-step synthesis of polymers also makes the process too complicated

Method used

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  • High-conductivity semi-interpenetrating polymer electrolyte containing ionic liquid cross-linking agent
  • High-conductivity semi-interpenetrating polymer electrolyte containing ionic liquid cross-linking agent
  • High-conductivity semi-interpenetrating polymer electrolyte containing ionic liquid cross-linking agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Dissolve PVDF-HFP in NMP at a solid-to-liquid ratio of 1:5, stir thoroughly for 6 hours and dissolve completely, then take 0.001 mol of functionalized polymerizable ionic liquid monomer and add 0.0005 mol of ionic liquid crosslinking agent , and add 1-ethyl-3-methylimidazole bistrifluoromethanesulfonimide salt ([Emim][TFSI]) plasticizer according to the total molar ratio of the reaction monomers at a ratio of 1:1, according to the total amount of the reaction monomers Add lithium salt LiTFSI with a molar ratio of 1:0.2, and at the same time add azobisisobutyronitrile AIBN with a mass fraction of 5% of the total amount of reaction monomers, stir at room temperature for 9 hours to fully mix into a clear solution, and use a spatula to spread the viscous solution evenly Spread it on a flat glass plate, place it in a vacuum oven at 70°C for in-situ thermal polymerization for 12 hours, continue to place it for 12 hours to dry, and finally obtain a cured cross-linked polyionic ...

Embodiment 2

[0027] Dissolve PVDF-HFP in NMP at a solid-to-liquid ratio of 1:5, stir thoroughly for 6 hours and dissolve completely, then take 0.001mol of functional polymerizable ionic liquid monomer, add 0.001mol of ionic liquid crosslinking agent , and add 1-ethyl-3-methylimidazole bistrifluoromethanesulfonimide salt ([Emim][TFSI]) plasticizer according to the total molar ratio of the reaction monomers at a ratio of 1:1, according to the total amount of the reaction monomers Add lithium salt LiTFSI with a molar ratio of 1:0.2, and at the same time add azobisisobutyronitrile AIBN with a mass fraction of 5% of the total amount of reaction monomers, stir at room temperature for 9 hours to fully mix into a clear solution, and use a spatula to spread the viscous solution evenly Spread it on a flat glass plate, place it in a vacuum oven at 70°C for in-situ thermal polymerization for 12 hours, continue to place it for 12 hours to dry, and finally obtain a cured cross-linked polyionic liquid sem...

Embodiment 3

[0029]Dissolve PVDF-HFP in NMP at a solid-to-liquid ratio of 1:5, stir thoroughly for 6 hours and dissolve completely, then take 0.001mol of functionalized polymerizable ionic liquid monomer and add 0.00025mol of ionic liquid crosslinking agent , and add 1-ethyl-3-methylimidazole bistrifluoromethanesulfonimide salt ([Emim][TFSI]) plasticizer according to the total molar ratio of the reaction monomers at a ratio of 1:1, according to the total amount of the reaction monomers Add lithium salt LiTFSI with a molar ratio of 1:0.2, and at the same time add azobisisobutyronitrile AIBN with a mass fraction of 5% of the total amount of reaction monomers, stir at room temperature for 9 hours to fully mix into a clear solution, and use a spatula to spread the viscous solution evenly Spread it on a flat glass plate, place it in a vacuum oven at 70°C for in-situ thermal polymerization for 12 hours, continue to place it for 12 hours to dry, and finally obtain a cured cross-linked polyionic li...

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Abstract

The invention provides a high-conductivity semi-interpenetrating polymer electrolyte containing an ionic liquid cross-linking agent, which is characterized in that the ionic liquid is used as the cross-linking agent, and polymerizable ionic liquid monomers form a network in a thermal initiation in-situ polymerization mode; and combining with a linear high-molecular polymer capable of providing skeleton support to finally form the polyion liquid-based electrolyte membrane with the semi-interpenetrating network structure. The electrolyte is prepared in situ through a one-step method, a polyion liquid cross-linked network is formed, an ion transmission channel is provided, the operation is simple, high ionic conductivity is shown, and the electrolyte has good cycle performance at room temperature. Compared with a traditional polymer electrolyte, the ionic liquid is used as the cross-linking agent to provide a more effective ion transmission channel, a new thought is provided for developing the polymer electrolyte, and the polymer electrolyte has a good application prospect.

Description

technical field [0001] The invention belongs to the field of electrochemistry and relates to a high-conductivity semi-interpenetrating polymer electrolyte containing an ionic liquid cross-linking agent. Background technique [0002] Lithium-ion batteries occupy a dominant position in markets such as portable devices and electric vehicles due to their high energy density, high output voltage, and fast response time. Metal lithium anode is used as the "holy grail" electrode of secondary lithium battery, with its high capacity (3860mAh g -1 ) and low electrode potential (−3.040 V vs standard hydrogen electrode) have attracted much attention in next-generation high-energy batteries. [0003] However, due to the extremely high reactivity of lithium metal, the use of organic liquid electrolyte as the main body will have potential safety hazards of flammability and explosion, and side reactions are prone to occur during charging and discharging, resulting in irreversible loss of e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0565H01M10/0525H01M2300/0082
Inventor 董陶沙一凡张锁江张海涛
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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