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Composite mesoporous silica (IL/SiO2) for encapsulating ionic liquid and preparation and application thereof

A mesoporous silica and ionic liquid technology, which is applied in secondary batteries, electrochemical generators, and final product manufacturing, can solve the problems of unstable electrochemical properties of electrolytes, and achieve improved mechanical properties and high conductivity. Effect

Inactive Publication Date: 2015-03-25
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such a high-loaded ionic liquid is added to the electrolyte system by physical blending, and may migrate out of it, resulting in unstable electrochemical properties of the electrolyte

Method used

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  • Composite mesoporous silica (IL/SiO2) for encapsulating ionic liquid and preparation and application thereof
  • Composite mesoporous silica (IL/SiO2) for encapsulating ionic liquid and preparation and application thereof
  • Composite mesoporous silica (IL/SiO2) for encapsulating ionic liquid and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～3

[0046] (1)IL / SiO 2 Preparation

[0047] Add a certain proportion of polyoxyethylene-polyoxypropylene-polyoxyethylene block copolymer (P123), 12mol / L HCl aqueous solution, and deionized water into the flask, stir at 40℃ until P123 is completely dissolved, use 1,3 , 5-Trimethylbenzene (TMB) as a pore expander was added to the flask and stirred for 4 hours. Add ethyl orthosilicate to the flask, continue to stir for 24h, raise the temperature to 90℃, stop stirring, crystallize for 24h, separate by suction filtration, wash with deionized water and ethanol, and extract at 130℃ for 24h. The extracted powder was dried in a vacuum oven at 80℃ for 4h to obtain mesoporous SiO 2 .

[0048] Mesoporous SiO 2 Disperse in an acetone solvent for ultrasonic dispersion for 2 hours, dissolve the IL in an acetone solvent, mix the two, and stir the mixture under reflux at 80°C for 10 hours. After separation by suction filtration, wash with methanol several times, and place the extracted powder in a va...

Embodiment 4

[0075] A composite mesoporous silica for encapsulating ionic liquids. It is a compound formed by 1-carboxymethyl-3-methylimidazole bistrifluoromethanesulfonimide salt and mesoporous silica (IL / SiO 2 ),

[0076] The structural formula of 1-carboxymethyl-3-methylimidazole bistrifluoromethanesulfonimide salt is:

[0077]

[0078] Mesoporous silica is expanded by a pore expander, and the pore size is in the range of 10-15nm. The expansion of mesoporous silica uses the following steps:

[0079] (1) Stir the polyoxyethylene-polyoxypropylene-polyoxyethylene block copolymer (P123), 12mol / L HCl aqueous solution, and deionized water at 40℃ until P123 is completely dissolved, and add 1,3,5-tri Toluene is used as a pore expander, and stirring is continued for 4h;

[0080] (2) Add ethyl orthosilicate and continue stirring for 24h, increase the temperature to 90℃, stop stirring, crystallize for 24h, separate by suction and wash with deionized water and ethanol, the above-mentioned polyoxyethylene-p...

Embodiment 5

[0091] A composite mesoporous silica for encapsulating ionic liquids. It is a compound formed by 1-carboxymethyl-3-methylimidazole bistrifluoromethanesulfonimide salt and mesoporous silica (IL / SiO 2 ),

[0092] The structural formula of 1-carboxymethyl-3-methylimidazole bistrifluoromethanesulfonimide salt is:

[0093]

[0094] The mesoporous silica is expanded by a pore expander, and the pore diameter is in the range of 10-15nm. The expansion uses the following steps:

[0095] (1) Stir the polyoxyethylene-polyoxypropylene-polyoxyethylene block copolymer (P123), 12mol / L HCl aqueous solution, and deionized water at 40℃ until P123 is completely dissolved, and add 1,3,5-tri Toluene is used as a pore expander, and stirring is continued for 4h;

[0096] (2) Add ethyl orthosilicate and continue to stir for 24h, raise the temperature to 90℃, stop stirring, crystallize for 24h, separate by suction filtration, wash with deionized water and ethanol, extract at 130℃ for 24h, polyoxyethylene -The...

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Abstract

The invention relates to composite mesoporous silica (IL / SiO2) for encapsulating ionic liquid and preparation and application thereof. The IL / SiO2 is a composition formed from 1-carboxymethyl-3-methylimidazole bis(trifluoromethane)sulfonimide salt (ionic liquid, IL for short) and mesoporous silica, the mesoporous silica is expanded through a pore-expanding agent, and the aperture range is 10-15 nanometers; the IL / SiO2 is applied to all-solid-state polymer electrolyte of a lithium ion battery, and a raw material comprises the following components in parts by weight: 100 parts of carboxylic acrylonitrile butadiene rubber, 2.0-3.0 parts of vulcanizing agents, 20-60 parts of lithium salt and 0.1-30 parts of IL / SiO2. Compared with the prior art, the composite mesoporous silica (IL / SiO2) disclosed by the invention can be used for effectively solubilizing the lithium salt by being applied to a polymer dielectric, thereby providing a lithium ion migration channel. The polymer electrolyte prepared by applying the composite mesoporous silica (IL / SiO2) has the advantages of higher room-temperature conductivity and excellent mechanical properties.

Description

Technical field [0001] The invention relates to the field of all-solid polymer electrolytes for lithium ion batteries, in particular to a composite mesoporous silica encapsulating ionic liquid and its application in polymer electrolytes. Background technique [0002] In recent years, polymer electrolytes have attracted widespread attention as an important material for improving the performance of lithium-ion batteries. The polymer electrolyte overcomes the problems of easy leakage and short circuit in the liquid electrolyte, and at the same time compensates for the low conductivity and poor film formation of the inorganic solid electrolyte. Current polymer electrolytes are divided into all solid polymer electrolytes and gel polymer electrolytes. The former is a system composed of a polymer body and a salt or an inorganic filler. Due to the limited dissolution of lithium salt, the conductivity is usually not high; the latter is A type of polymer electrolyte similar to a gel after...

Claims

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Application Information

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IPC IPC(8): H01M10/056H01M10/058
CPCH01M10/0525H01M10/0565H01M10/058Y02E60/10Y02P70/50
Inventor 陆艳博林琼任文坛张勇
Owner SHANGHAI JIAO TONG UNIV
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