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Mixed ion capacitor and preparation method thereof

A capacitor and mixed ion technology, applied in the field of energy storage, can solve the problems of increased capacity and low energy density of supercapacitors, and achieve the effects of increasing energy density, improving the same ion effect, and reducing the cage effect.

Inactive Publication Date: 2019-04-16
UNIV OF ELECTRONICS SCI & TECH OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the technical bottleneck of low energy density and the problem of increasing capacity in supercapacitors, the present invention finds a new way on the basis of existing research, shifts the research focus from the electrode to the electrolyte system, and develops a mixed ion electrolyte based Superjunction Capacitors to Efficiently Increase Energy Density of Devices

Method used

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  • Mixed ion capacitor and preparation method thereof
  • Mixed ion capacitor and preparation method thereof
  • Mixed ion capacitor and preparation method thereof

Examples

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Embodiment 1

[0039] This embodiment provides a preparation method of a mixed ion capacitor, using the following raw materials: lithium hexafluorophosphate, sodium perchlorate, dimethyl carbonate (DMC), vinyl ester (EC), capacitor carbon, conductive carbon black, PVDF; specific steps as follows:

[0040] First, lithium hexafluorophosphate and sodium perchlorate are dissolved in a solvent at a molar ratio of 1:1, and the solvent is configured from dimethyl carbonate (DMC) and vinyl ester (EC) at a volume ratio of 1:1. The concentration of the whole salt in the solvent is 1.2mol / L. The capacitor carbon material, conductive agent, and binder are mixed according to the mass ratio of 8:1:1 to prepare a slurry. The conductive agent is selected from conductive carbon black, and the binder is selected from PVDF. The slurry is coated on the aluminum film to prepare an electrode sheet. The prepared electrode sheet is dried in a vacuum oven to remove moisture from the electrode sheet. The drying ti...

Embodiment 2

[0043] This embodiment provides a preparation method of a mixed ion capacitor, using the following raw materials: lithium perchlorate, sodium hexafluorophosphate, potassium hexafluorophosphate, diethyl carbonate (DEC), ethylene carbonate (EC), methyl carbonate Ethyl ester (EMC), capacitor carbon, conductive agent, binder; the specific steps are as follows:

[0044] First, dissolve lithium perchlorate, sodium hexafluorophosphate, and potassium hexafluorophosphate in a solvent at a molar ratio of 1:1:1. The solvent consists of diethyl carbonate (DEC), ethylene carbonate (EC), methyl carbonate Ethyl ester (EMC) is configured according to the volume ratio of 1:1:1. The concentration of the whole salt in the solvent is 1.3 moles per liter. The capacitor carbon material, conductive agent, and binder are mixed according to the mass ratio of 8:1:1 to prepare a slurry. The conductive agent is selected from conductive carbon black, and the binder is selected from PVDF. The slurry is c...

Embodiment 3

[0052] This embodiment provides a preparation method of a mixed ion capacitor, using the following raw materials: sodium perchlorate, potassium hexafluorophosphate, propylene carbonate (PC), ethylene carbonate (EC), ethyl methyl carbonate (EMC), Capacitor carbon, conductive agent, binder; the specific steps are as follows:

[0053] First, sodium perchlorate and potassium hexafluorophosphate are dissolved in a solvent at a molar ratio of 1:1, and the solvent is composed of propylene carbonate (PC), ethylene carbonate (EC), and ethyl methyl carbonate (EMC) according to the volume ratio 1:1:1 ratio for configuration. The concentration of the whole salt in the solvent is 1.1 moles per liter. The capacitor carbon material, conductive agent, and binder are mixed according to the mass ratio of 8:1:1 to prepare a slurry. The conductive agent is selected from conductive carbon black, and the binder is selected from PVDF. The slurry is coated on the aluminum film to prepare an electro...

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Abstract

The invention relates to a mixed ion capacitor and a preparation method thereof, belonging to the technical field of capacitors. There are no fewer than two types of anions or cations or there are nofewer than two types of anions and cations in the electrolyte of the capacitor of the invention. The anions or cations are different in ion volume or different in charge quantity, or the anions or cations are different in ion volume and charge quantity. The ion cage effect can be reduced, and the energy density of the capacitor can be improved. The common ion effect can be overcome, and the salting-out phenomenon can be avoided based on the diverse ion effect. The freedom of ions is improved, and the rate performance is improved while the cycling performance and stability of the capacitor areimproved. Moreover, the stack density of anions and cations on the surface of the electrode material can be improved, and the capacity loss in space can be reduced as much as possible so as to improvethe capacity of the capacitor. The cost can be reduced, the cost advantage of the capacitor can be developed while the performance is improved, and the competitive advantage of the capacitor in market can be improved.

Description

technical field [0001] The invention belongs to the technical field of energy storage, and in particular relates to a mixed ion capacitor and a preparation method thereof. Background technique [0002] The current mainstream capacitors include traditional capacitors and supercapacitors. Supercapacitors are a new type of electronic energy storage system between traditional capacitors and batteries. Compared with traditional capacitors, the energy density is significantly improved, and its cycle performance and power density have no obvious loss, so it is more widely used than traditional capacitors; compared with traditional batteries, the biggest advantage of supercapacitors lies in their high Power density and long cycle life, but the biggest weakness lies in the low energy density, which is only a few tenths of that of batteries. Therefore, the biggest challenge at this stage and also the future development trend is to increase the energy density of supercapacitors. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/04H01G11/62H01G11/84
CPCH01G11/04H01G11/62H01G11/84Y02E60/13
Inventor 吴孟强徐自强陈治马云飞李湜
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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