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Electrolyte of mixed type super capacitor

A technology of supercapacitors and electrolytes, applied in the direction of hybrid capacitor electrolytes, etc., to achieve good charge-discharge cycle stability

Inactive Publication Date: 2014-07-23
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this type of electrolyte is optimized for the lithium ion deintercalation reaction at the battery electrode, it is not an ideal choice for the formation of the double layer of the activated carbon electrode (compared to the commonly used supercapacitor electrolyte)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Electrodes were prepared and button-type lithium titanate / activated carbon hybrid supercapacitors were assembled according to the method described in "Specific Embodiments".

[0023] The composition and ratio (volume) of the electrolyte used are as follows:

[0024] Solvent: 1 part of propylene carbonate (PC), 1 part of ethylene carbonate (EC), 1 part of dimethyl carbonate (DMC);

[0025] Solute: Tetraethylammonium tetrafluoroborate (TEABF 4 ) concentration 0.3mol / L; lithium hexafluorophosphate (LiPF 6 ) concentration of 0.7mol / L.

[0026] The conductivity of the prepared electrolyte was 11.62mS / cm. The results show that the conductivity of the electrolyte prepared in Example 1 is higher than that of the electrolyte in Comparative Example 1 (only lithium hexafluorophosphate is used as the electrolyte salt) (10.96 mS / cm).

[0027] figure 1 The middle curve (1) shows the change of the specific capacity of the lithium titanate / activated carbon hybrid supercapacitor as...

Embodiment 2

[0030] Prepare electrodes and assemble button-type lithium titanate / activated carbon hybrid supercapacitors according to the method described in "Specific Embodiments".

[0031] The composition and ratio (volume) of the electrolyte used are as follows:

[0032] Solvent: 1 part of propylene carbonate (PC), 1 part of ethylene carbonate (EC), 2 parts of dimethyl carbonate (DMC),

[0033] Solute: Tetraethylammonium tetrafluoroborate (TEABF 4 ) concentration 0.5mol / L; lithium hexafluorophosphate (LiPF 6 ) concentration of 0.5mol / L.

[0034] The conductivity of the prepared electrolyte was 11.47mS / cm. It shows that the conductivity of the electrolyte prepared in Example 2 is higher than that of the electrolyte salt in Comparative Example 1 (10.96 mS / cm).

[0035] image 3 The change of the specific capacity of the hybrid supercapacitor using the electrolyte prepared in Example 2 with the number of cycles. The results in the figure show that the cycle stability of the hybrid su...

Embodiment 3

[0037] Prepare electrodes and assemble button-type lithium titanate / activated carbon hybrid supercapacitors according to the method described in "Specific Embodiments".

[0038] The composition and ratio (volume) of the electrolyte used are as follows:

[0039] Solvent: 1 part of propylene carbonate (PC), 1 part of ethylene carbonate (EC), 2 parts of dimethyl carbonate (DMC),

[0040]Solute: Tetraethylammonium tetrafluoroborate (TEABF 4 ) concentration 1.0mol / L; lithium hexafluorophosphate (LiPF 6 ) concentration of 0.5mol / L.

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Abstract

The invention relates to an electrolyte of a mixed type super capacitor. The electrolyte is prepared by two electrolyte salts and more than two organic solvents, one of the electrolyte salts that are used is lithium salt, and the other is quaternary ammonium salt. One of the solvents is propylene carbonate, and the other solvents are one or more of acetonitrile, propionitrile, ethylene carbonate, dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, and gamma-butyrolactone. The concentration range of the two electrolyte salts in the electrolyte is 0.1-2 mol / L. A mixed type super capacitor using the electrolyte shows good charge-discharge cycle stability.

Description

technical field [0001] The invention belongs to the field of hybrid supercapacitors, in particular to a hybrid supercapacitor electrolyte. Background technique [0002] With the increasing scarcity of resources and energy, human beings are more dependent on renewable new energy. Due to the advantages of fast charging, long cycle life, maintenance-free, and pollution-free, supercapacitors have become a research hotspot in the energy field. Supercapacitors have broad application prospects in transportation, aviation, military and other fields. [0003] According to different energy storage mechanisms, supercapacitors are divided into electric double layer electrochemical supercapacitors and pseudocapacitive supercapacitors. Hybrid supercapacitors use one pole of a Faraday rechargeable battery as the negative pole, and one pole of the supercapacitor (usually a high specific surface area activated carbon electrode) as the positive pole. Compared with electric double layer ele...

Claims

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Application Information

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IPC IPC(8): H01G11/58
CPCY02E60/13
Inventor 阎景旺薛荣郝立星衣宝廉
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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