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Electrolytic solution for graphene-based lithium-ion capacitor and preparation method of electrolytic solution

A technology of alkenyl lithium and capacitors, which is applied in the field of preparation of electrolytes for graphene-based lithium-ion capacitors, can solve the problems of slow adsorption and desorption process, limit the power characteristics of graphene-based lithium-ion capacitors, etc., and reduce solvation , Ratio characteristics and capacity characteristics are improved, and the effect of improving safety performance

Inactive Publication Date: 2019-05-21
CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when traditional electrolytes are used in graphene-based lithium-ion capacitors, due to the solvation of ions, the adsorption and desorption process on the surface of graphene materials is relatively slow, which limits the power characteristics of graphene-based lithium-ion capacitors.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Under an argon atmosphere, add 151.91g of lithium hexafluorophosphate and 71.88g of lithium difluorooxalate borate, 5mL of propynyl methanesulfonate, 5mL of tributyl phosphate, and 50mL of 1-ethyl-trimethylimidazole into a 1L volumetric flask (EMI) Tetrafluoroborate, then add the mixed solvent of dimethyl carbonate, diethyl carbonate and ethylene carbonate to the volumetric flask at a volume ratio of 1:1:1 until the total volume of the solution is 1L, pour the solution into Continue to stir and dissolve in the container with a lid, mix well and let it stand for 24 hours to obtain the target electrolyte.

Embodiment 2

[0017] Under an argon atmosphere, add 75.955g of lithium hexafluorophosphate, 3mL of fluoroacetone, 7mL of propynyl methanesulfonate, 10mL of triphenyl phosphate, and 50mL of 1-ethyl-trimethylimidazolium tetrafluoroboron into a 1L volumetric flask Add the mixed solvent of dimethyl carbonate, diethyl carbonate and ethylene carbonate to the volumetric flask at a volume ratio of 1:1:1 until the total volume of the solution is 1L, then pour the solution into a container with a lid and continue stirring Dissolved, must be fully mixed and allowed to stand for 24 hours to obtain the target electrolyte.

Embodiment 3

[0019] Under an argon atmosphere, add 187.48g of lithium tetrafluoroborate, 20mL of vinyl sulfite, 20mL of trimethyl phosphate, and 300mL of nitrogenmethylethylpyrrole hexafluorophosphate into a 1L volumetric flask in sequence, and then by volume ratio: Add the mixed solvent of ethyl methyl carbonate and fluoroethylene carbonate at a ratio of 1:1 to the volumetric flask until the total volume of the solution is 1L. Pour the solution into a container with a lid and continue to stir and dissolve. After mixing thoroughly, let it stand for 24 hours to obtain the target electrolytic solution. liquid.

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Abstract

The invention discloses a preparation method of an electrolytic solution for a graphene-based lithium-ion capacitor. According to the method, a lithium salt and ion liquid mixed system is used as an electrolyte of the electrolytic solution, and an organic solvent is used as a solvent system to prepare a novel lithium-ion capacitor electrolytic solution system with ion adsorption and ion embeddingcharacteristics. The ion embedding characteristic of lithium salt and the ion adsorption characteristic of ion liquid are utilized to realize a surface functionalization reaction and ion adsorption synergetic energy storage of graphene-based positive ions, and finally the characteristics of high specific capacity and high multiplying power of the graphene-based lithium-ion capacitor can be broughtinto play.

Description

technical field [0001] The invention belongs to the technical field of chemical power sources, in particular to a method for preparing an electrolyte for a graphene-based lithium ion capacitor. Background technique [0002] Lithium-ion capacitors are a new type of chemical energy storage device. The positive electrode is a large specific surface area carbon material with ion surface adsorption as the positive electrode, and the negative electrode is a lithium-intercalated lithium storage material. Its energy storage principle combines lithium-ion batteries and dual Electrochemical capacitor mechanism, so the energy density is higher than that of electric double layer capacitors, and the power density is higher than that of lithium-ion batteries. Graphene-based lithium-ion capacitors are a new type of lithium-ion capacitor with graphene-based materials as the positive electrode and lithium-intercalated materials as the negative electrode. The performance of its power charact...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/06H01G11/62H01G11/64H01G11/60H01G11/84
CPCY02E60/13
Inventor 倪旺丁飞王泽深宗军许寒刘兴江
Owner CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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