Supercapacitor electrolyte with high charge-discharge cycle stability and supercapacitor

A supercapacitor and cycle stability technology, applied in the field of electrochemical materials, can solve the problems such as the need to improve the charge and discharge cycle stability, achieve the effect of improving ion conductivity, improving dissolution and dissociation ability, and reducing internal resistance

Inactive Publication Date: 2018-01-09
WUJIANG JIA BILLION ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is obvious that the stability of the charge-discharge cycle of the existing electrolytes for supercapacitors needs to be improved under the premise of good overall performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: a kind of supercapacitor electrolyte of high charge-discharge cycle stability, it is made up of electrolyte salt and aprotic organic solvent, and described electrolyte salt is tetramethylammonium dioxalate borate and lithium tetrafluoroborate, The aprotic organic solvent is a mixture of propylene carbonate, γ-butyrolactone, acetonitrile and N,N dimethylformamide.

[0015] Further, the mass ratio of tetramethylammonium dioxalate borate and lithium tetrafluoroborate is 1:3, further, the molar concentration of the electrolyte salt in the electrolyte is 1.5mol / L, Further, the mass part ratio of the propylene carbonate, γ-butyrolactone, acetonitrile and N,N dimethylformamide is 5:2:2:1.

[0016] The preparation method of the supercapacitor electrolyte with high charge-discharge cycle stability, its specific steps are: first fully mix the aprotic organic solvent, remove water from the mixed aprotic organic solvent to a water content below 10ppm, Then add the el...

Embodiment 2

[0017] Embodiment 2: a kind of supercapacitor electrolyte of high charge-discharge cycle stability, it is made up of electrolyte salt and aprotic organic solvent, and described electrolyte salt is tetramethylammonium dioxalate borate and lithium tetrafluoroborate, The aprotic organic solvent is a mixture of propylene carbonate, γ-butyrolactone, acetonitrile and N,N dimethylformamide.

[0018] Further, the mass ratio of tetramethylammonium dioxalate borate and lithium tetrafluoroborate is 1:4, further, the molar concentration of the electrolyte salt in the electrolyte is 0.6mol / L, Further, the mass part ratio of propylene carbonate, γ-butyrolactone, acetonitrile and N,N dimethylformamide is 3:1:1:1.

[0019] The specific steps of the preparation method of the supercapacitor electrolyte with high charge-discharge cycle stability are the same as in Example 1.

Embodiment 3

[0020] Embodiment 3: a kind of supercapacitor electrolyte of high charge-discharge cycle stability, it is made up of electrolyte salt and aprotic organic solvent, and described electrolyte salt is tetramethylammonium dioxalate borate and lithium tetrafluoroborate, The aprotic organic solvent is a mixture of propylene carbonate, γ-butyrolactone, acetonitrile and N,N dimethylformamide.

[0021] Further, the mass part ratio of tetramethylammonium dioxalate borate and lithium tetrafluoroborate is 1:2, further, the molar concentration of the electrolyte salt in the electrolyte is 2mol / L, further Preferably, the mass part ratio of the propylene carbonate, γ-butyrolactone, acetonitrile and N,N dimethylformamide is 6:3:3:1.

[0022] The specific steps of the preparation method of the supercapacitor electrolyte with high charge-discharge cycle stability are the same as in Example 1.

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Abstract

A supercapacitor electrolyte with high charge-discharge cycle stability comprises an electrolyte salt and a proton inertia organic solvent, wherein the electrolyte salt is tetramethylammonium bis(oxalate)borate and lithium tetrafluoroborate, and the proton inertia organic solvent is a mixture of propylene carbonate, gamma-butyrolactone, acetonitrile and N, N-dimethylformamide. With the adoption ofappropriate proton inertia organic solvent, the dissolving capacity and the dissociation capacity of the electrolyte salt in the supercapacitor electrolyte are improved, the ion conductivity of the electrolyte is improved, the internal resistance of an organic electrolyte is reduced, an electrochemical stable window of the electrolyte is expanded, so that the obtained electrolyte has favorable electrochemical stability, chemical stability and charge-discharge cycle stability.

Description

technical field [0001] The invention relates to the field of electrochemical materials, in particular to a supercapacitor electrolyte and a supercapacitor with high charge-discharge cycle stability. Background technique [0002] Supercapacitor is a highly competitive energy storage product that can realize fast charging and high current discharge, and has a charging life of more than 100,000 times. It plays an extremely important role in some applications that require short-term high-rate discharge. . [0003] Supercapacitors are mainly composed of electrode materials, current collectors, diaphragms and electrolytes. As an important part of supercapacitors, electrolytes composed of solvents and electrolyte salts are extremely important research areas. Different types of electrolytes often have a significant impact on the performance of supercapacitors. Finding a suitable electrolyte is one of the focuses of current research on supercapacitors. Electrolyte stability, decomp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/60H01G11/62H01G11/84
CPCY02E60/13
Inventor 陆全明项彬彬
Owner WUJIANG JIA BILLION ELECTRONICS TECH
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