A kind of mofs ionic liquid supercapacitor and preparation method thereof

A supercapacitor, ionic liquid technology, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc., can solve the problems of reducing energy density, inability to improve, limiting supercapacitor power density, etc., to achieve energy density and power density improvement , easy to study, increase the effect of capacitance

Active Publication Date: 2022-08-05
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using ionic liquids as electrolytes can usually achieve large energy densities, but the large viscosity of ionic liquids limits the power density of supercapacitors
For carbon materials, adding organic solvents can improve their power density, but cannot increase or even reduce their energy density.

Method used

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  • A kind of mofs ionic liquid supercapacitor and preparation method thereof
  • A kind of mofs ionic liquid supercapacitor and preparation method thereof
  • A kind of mofs ionic liquid supercapacitor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] (1) Using the same Ni as in Comparative Example 1 3 (HITP) 2 Powders are made into electrodes.

[0049] (2) Use a conductivity meter to test the conductivity of the mixed solvent when adding different concentrations of organic solvents, such as Image 6 As shown, the ionic liquid used in this example is 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIM][PF 6 ]), and the organic solvent used was acetonitrile (AN).

[0050] (3) Use [BMIM][PF 6 A mixed solvent with a molar ratio of ] / AN of 0.107 was used as the electrolyte to assemble a supercapacitor with a conductive MOF electrode. The energy density, power density, capacitance, equivalent series resistance / internal resistance and other parameters were measured by electrochemical means. The measurement results are shown in Table 1 and Figure 8 to Figure 10 As shown, after adding an organic solvent with a ratio of 0.107, the energy density and power density of the supercapacitor are 276% and 1263% of those of p...

Embodiment 2

[0052] (1) Using the same Ni as in Comparative Example 1 3 (HITP) 2 Powders are made into electrodes.

[0053] (2) Use a conductivity meter to test the conductivity of the mixed solvent when adding different concentrations of organic solvents, such as Image 6 As shown, the ionic liquid used in this example is 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIM][PF 6 ]), and the organic solvent used was acetonitrile (AN).

[0054] (3) Use [BMIM][PF 6 A mixed solvent with a molar ratio of ] / AN of 0.2 was used as the electrolyte to assemble a supercapacitor with a conductive MOF electrode. The energy density, power density, capacitance, equivalent series resistance / internal resistance and other parameters were measured by electrochemical means. The measurement results are shown in Table 1 and Figure 8 to Figure 10 As shown, after adding an organic solvent with a ratio of 0.2, the energy density and power density of the supercapacitor are 344.7% and 1096% of those of pur...

Embodiment 3

[0058] (1) Using the same Ni as in Comparative Example 2 3 (HITP) 2 Powders are made into electrodes.

[0059] (2) Use a conductivity meter to test the conductivity of the mixed solvent when adding different concentrations of organic solvents, such as Figure 7 As shown, the ionic liquid used in this example is 1-ethyl-3-methylimidazolium tetrafluoroborate ([EMIM][BF 4 ]), and the organic solvent used was acetonitrile (AN).

[0060] (3) Use [EMIM][BF 4 A mixed solvent with a molar ratio of ] / AN of 0.107 was used as the electrolyte to assemble a supercapacitor with a conductive MOF electrode. Using electrochemical means to measure its energy density, power density, capacitance, equivalent series resistance / internal resistance and other parameters, the measurement results are as follows Figure 8 to Figure 10 shown.

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Abstract

The invention belongs to the field of supercapacitors, and specifically discloses a MOFs ionic liquid supercapacitor and a preparation method thereof, comprising the following steps: using conductive MOFs materials to make electrodes, mixing an organic solvent and ionic liquid to obtain a mixed solvent, and using the mixed solvent As an electrolytic solution, the electrolytic solution and the electrode were assembled to obtain a supercapacitor. In the present invention, the organic solvent will change the coordination structure of anions and cations in the ionic liquid system, so that there is almost no coordination between anions and cations, weakening the interaction between anions and cations, and the binding energy between anions and cations will also increase with the voltage. It increases and decreases, so that the charging can be carried out smoothly and the power density can be improved; at the same time, the addition of organic solvent will change the ionophobicity of the conductive MOF pores, the capacitance performance of the ionophobic pore system is higher, and the charging speed is faster, realizing super The energy density and power density of capacitors are simultaneously improved.

Description

technical field [0001] The invention belongs to the field of supercapacitors, and more particularly, relates to a MOFs ionic liquid supercapacitor and a preparation method thereof. Background technique [0002] At present, the electrode material commonly used in supercapacitors is carbon material, and conductive MOFs are a new type of supercapacitor material due to their regular pore structure, precise control of pore size, and potential large specific surface area. [0003] Ionic liquids are low-melting liquids composed entirely of anions and cations. They have the advantages of stable electrochemical properties, low volatility, non-flammability, and high voltage window (usually greater than 3.5V), making them very suitable for supercapacitor electrolytes. Large energy densities can usually be obtained using ionic liquids as electrolytes, but the large viscosity of ionic liquids limits the power density of supercapacitors. For carbon materials, adding organic solvents can ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/86H01G11/24H01G11/30
CPCH01G11/86H01G11/30H01G11/24Y02E60/13
Inventor 冯光牛良叶挺
Owner HUAZHONG UNIV OF SCI & TECH
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