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Molecular gel electrolyte and its prepn

A molecular gel and electrolyte technology, applied in circuits, electrical components, secondary batteries, etc., can solve problems such as performance degradation, plasticization system is not a stable system, increase battery interface impedance, etc.

Inactive Publication Date: 2004-04-07
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the current polymer electrolytes, plasticized polymer electrolytes have the best overall performance, but the plasticized system is not a stable system, and there is a problem of plasticizer migration, resulting in a sharp drop in performance
Moreover, it is more difficult to solve the contact problem between the solid electrolyte and the electrode than the liquid electrolyte, which increases the interfacial impedance of the battery, thereby affecting the performance of the lithium-ion battery

Method used

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  • Molecular gel electrolyte and its prepn
  • Molecular gel electrolyte and its prepn
  • Molecular gel electrolyte and its prepn

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Lithium perchlorate (LiClO 4 ) aqueous solution, the concentration of lithium perchlorate is 0.15mol. Take 4.06 g of the lithium perchlorate aqueous solution and add 0.126 g of gel factor D to make the content of gel factor D in the solution 0.04 mol. The mixture was kept stirring at 65-80°C until all the solids were dissolved. The product is cooled to room temperature, and the inorganic lithium salt-containing molecular gel electrolyte is obtained.

[0061] Similarly, the preparation of lithium bis(trifluoromethylsulfonimide) (LiN(CF 3 SO 2 ) aqueous solution, the concentration of two (trifluoromethylsulfonimide) lithium is 0.15mol. After adding the gel factor D, the organic lithium salt-containing molecular gel electrolyte is obtained. The room temperature conductivity of two different lithium salt salt molecular gel electrolytes is at 10 -1 ~10 -2 S cm -1 between.

Embodiment 2

[0063] Lithium perchlorate (LiClO 4 ) of propylene carbonate (PC) solution, the concentration of lithium perchlorate is 0.15mol. Take this lithium perchlorate propylene carbonate solution 4.06g, add 0.126g gel factor D, make the content of gel factor D in the solution be 0.04mol. The mixture was kept stirring at 80-100°C until all solids were dissolved. The product is cooled to room temperature to obtain a molecular gel electrolyte containing inorganic lithium salt propylene carbonate.

[0064] Similarly, the preparation of lithium bis(trifluoromethylsulfonimide) (LiN(CF 3 SO 2 ) of propylene carbonate solution, the concentration of two (trifluoromethylsulfonimide) lithium is 0.15mol. After adding the gel factor D, the molecular gel electrolyte containing organic lithium salt propylene carbonate is obtained. The room temperature conductivity of two different lithium salt organic molecular gel electrolytes is at 10 -3 S cm -1 between.

Embodiment 3

[0066] Similar to the methods of Examples 1 and 2, dimethylformamide (DMF) molecular gel electrolytes containing lithium perchlorate and lithium bis(trifluoromethylsulfonimide) were respectively prepared.

[0067] Similar to the methods of Examples 1 and 2, dimethyl sulfoxide (DMSO) molecular gel electrolytes containing lithium perchlorate and lithium bis(trifluoromethylsulfonimide) were prepared respectively.

[0068] The room temperature conductivity of DMF or DMSO organic molecular gel electrolyte is 10 -3 ~10 -4 S cm -1 between.

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Abstract

The present invention discloses one kind of molecular gel electrolyte comprising gel factor of molar concentration of 0.02-0.1 mol and lithium salt of molar concentration of 0.05-1 mol except water and organic solvent. It gel factor has the molecular structure expression of R-OCHN-X-NHCO-R, where R is C17H35, X is-C6H4-CH2-C6H4-, -C6H4, -C6H12 or -C6H4-O-C6H4-. The preparation process includes mixing the material in the said proportion inside a container, heating to dissolve the solid matter completely and cooling to room temperature. By means of hydrogen bond, pi-pi bond, van der Waals force, etc among gel molecules, the small solvent molecules are fixed to form the molecular gel electrolyte. The molecular gel electrolyte has high conductivity, like liquid electrolyte, and no leakage, like solid electrolyte, and is easy to form.

Description

technical field [0001] The invention belongs to the field of batteries, and specifically relates to a molecular gel electrolyte and a preparation method thereof, that is, a molecular gel electrolyte obtained by gelling an organic solvent and water under the action of a gel factor. Background technique [0002] The electrolyte of the battery is mainly divided into liquid electrolyte, solid polymer electrolyte and molten salt electrolyte. Research and development in recent years has focused on the former two. [0003] The liquid electrolyte consists of conductive lithium salts, solvents and additives. Liquid electrolytes generally have high ionic conductivity (≥10 -2 S cm -1 ). Although liquid electrolyte lithium-ion batteries have been commercialized for a long time, some problems, such as easy leakage and volatilization of the electrolyte during use, have not been resolved, which limit and affect the performance of the battery and shorten its service life. In particular...

Claims

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Application Information

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IPC IPC(8): C07C233/34H01B1/12H01M10/0565
CPCY02E60/122
Inventor 杨亚江孟亚斌
Owner HUAZHONG UNIV OF SCI & TECH
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