MOFs ionic liquid supercapacitor and production method thereof

A technology of supercapacitors and ionic liquids, applied in the manufacture of hybrid/electric double layer capacitors, hybrid capacitor electrodes, etc., can solve the problems of being unable to increase, limit the power density of supercapacitors, and reduce energy density, so as to achieve convenience in research, energy density and Increased power density and the effect of increased power density

Active Publication Date: 2021-11-02
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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  • MOFs ionic liquid supercapacitor and production method thereof
  • MOFs ionic liquid supercapacitor and production method thereof
  • MOFs ionic liquid supercapacitor and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] (1) adopt the same Ni in comparative example 1 3 (HITP) 2 The powder is made as an electrode.

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

[0050] (3) Use [BMIM][PF 6 ] / AN with a molar ratio of 0.107 was used as the electrolyte and assembled with conductive MOF electrodes to form a supercapacitor. Using electrochemical means to measure its energy density, power density, capacitance, equivalent series resistance / internal resistance and other parameters, the measurement results are shown in Table 1 and Figure 8 to Figure 10 As shown, after adding the organic solvent with a ratio of 0.107, the energy density and power density of the supercapacitor are 276% and 1263% of those of pure ionic liqu...

Embodiment 2

[0052] (1) adopt the same Ni in comparative example 1 3 (HITP) 2 The powder is made as an electrode.

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

[0054] (3) Use [BMIM][PF 6 ] / AN with a molar ratio of 0.2 was used as the electrolyte, and the supercapacitor was assembled with the 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 shown in Table 1 and Figure 8 to Figure 10 As shown, after adding the organic solvent at a ratio of 0.2, the energy density and power density of the supercapacitor are 344.7% and 1096% of those of pure ionic liquid...

Embodiment 3

[0058] (1) using the same Ni as in Comparative Example 2 3 (HITP) 2 The powder is made as an electrode.

[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 Shown, the ionic liquid used in this embodiment is 1-ethyl-3-methylimidazolium tetrafluoroborate ([EMIM][BF 4 ]), the organic solvent used is acetonitrile (AN).

[0060] (3) Use [EMIM][BF 4 ] / AN with a molar ratio of 0.107 was used as the electrolyte and assembled with conductive MOF electrodes to form a supercapacitor. 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 particularly discloses an MOFs ionic liquid supercapacitor and a production method thereof. The method comprises the following steps: employing a conductive MOFs material to make an electrode, mixing an organic solvent with an ionic liquid to obtain a mixed solvent, taking the mixed solvent as an electrolyte, and assembling the electrolyte and the electrode to obtain the supercapacitor. The organic solvent can change the coordination structure of zwitterions in an ionic liquid system so that the zwitterions are almost free of coordination, the interaction between the zwitterions and the zwitterions is weakened, the binding energy between the zwitterions and the zwitterions is also reduced along with the increase of the voltage, the charging is smoothly carried out, and the power density is improved; and meanwhile, due to the addition of the organic solvent, the hydrophobic ionic performance of conductive MOF holes can be changed, the capacitance performance of a hydrophobic ionic hole system is higher, the charging speed is higher, and the energy density and the power density of the supercapacitor are improved at the same time.

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 materials commonly used in supercapacitors are carbon materials, and conductive MOFs are a new type of supercapacitor materials 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 performance, low volatility, non-flammability, and high voltage window (usually greater than 3.5V). They are very suitable for supercapacitor electrolytes. Using ionic liquids as electrolytes can usually achieve large energy densities, but the high viscosity of ionic liquids limits the power density of supercapacitors. For carbon materials, adding organic solvents can impr...

Claims

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Application Information

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Patent Type & Authority Applications(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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