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High-energy-density super capacitor and preparation method thereof

A supercapacitor, high energy density technology, used in the manufacture of hybrid/electric double layer capacitors, electrolytic capacitors, hybrid capacitor electrodes, etc. Fully utilize and other issues to achieve the effect of increasing energy density, ultra-long cycle life, and simplifying the operation process

Active Publication Date: 2015-09-16
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Great progress has been made in the research of electrode materials and electrolytes. However, the common problem is that after the electrode materials and electrolytes are assembled into devices, the available voltage window of the electrolyte and the high specific capacity of the electrode materials are not fully utilized.
Asymmetric capacitors based on different energy storage mechanisms still have the problem of matching the performance of the positive and negative electrodes. In addition, the cycle life and high-current charge and discharge performance of the assembled device are greatly affected by the material electrodes that undergo pseudocapacitive reactions, which are symmetrical with carbon-based capacitors. type capacitors compared to the gap is very obvious

Method used

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  • High-energy-density super capacitor and preparation method thereof
  • High-energy-density super capacitor and preparation method thereof
  • High-energy-density super capacitor and preparation method thereof

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Embodiment 1

[0038] Regulate graphene as electrode material (oxygen content 6.5at%, specific surface area 412m 2 / g) and with LiPF 6 The ethylene carbonate / dimethyl carbonate solution is the process of the supercapacitor system of the electrolyte as follows:

[0039] Graphene materials are used to make electrode sheets, and LiPF 6 Ethylene carbonate / dimethyl carbonate solution as electrolyte (where LiPF 6 The concentration is 1mol / L, the volume ratio of ethylene carbonate to dimethyl carbonate is 1:1), and it is used as positive and negative electrodes and lithium foil electrodes to assemble supercapacitor devices. The upper limit of the available potential window of the electrolyte is between 4.3V and 0.001V vs. Li, so that the positive and negative electrodes are charged and discharged at a constant current of 175mA / g with respect to the lithium electrode for 20 cycles respectively. Obtain the intersection point E'ov of the positive electrode discharge curve and the negative electrode...

Embodiment 2

[0044] Multi-walled carbon nanotubes (diameter2 / g, oxygen content 4.5at%) made into electrode sheet, with LiPF 6 Ethylene carbonate / dimethyl carbonate solution as electrolyte (where LiPF 6 The concentration is 1mol / L, the volume ratio of ethylene carbonate to dimethyl carbonate is 1:1), and it is used as positive and negative electrodes and lithium foil electrodes to assemble supercapacitor devices. The upper limit of the available potential window of the electrolyte is between 4.3V and 0.001V vs. Li, so that the positive and negative electrodes are charged and discharged at a constant current of 175mA / g with respect to the lithium electrode for 20 cycles respectively. Obtain the intersection point E'ov of the positive electrode discharge curve and the negative electrode charge curve. Then charge (discharge) the positive and negative electrodes to E’ov constant voltage for 12 hours at the same time. A modulated supercapacitor device is obtained.

[0045] Such as Image 6 ...

Embodiment 3

[0048] Single-walled carbon nanotubes (diameter2 / g, oxygen content 6.5at%) made into electrode sheet, with LiPF 6 Ethylene carbonate / dimethyl carbonate solution as electrolyte (where LiPF 6 The concentration is 1mol / L, the volume ratio of ethylene carbonate to dimethyl carbonate is 1:1), and it is used as positive and negative electrodes and lithium foil electrodes to assemble supercapacitor devices. The upper limit of the available potential window of the electrolyte is between 4.3V and 0.001V vs. Li, so that the positive and negative electrodes are charged and discharged at a constant current of 175mA / g with respect to the lithium electrode for 20 cycles respectively. Obtain the intersection point E'ov of the positive electrode discharge curve and the negative electrode charge curve. Then charge (discharge) the positive and negative electrodes to E’ov constant voltage for 12 hours at the same time. A modulated supercapacitor device is obtained.

[0049] Such as Figure ...

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Abstract

The invention discloses a high-energy-density super capacitor and a preparation method thereof, and belongs to the field of electrochemical energy storage. Through introducing a metal lithium electrode in the assembling process of the super capacitor, the electrochemical state of an electrode material is controlled, charges are injected into the electrode material, positive and negative materials for electrochemical potential adjustment are obtained, working potential windows of positive and negative electrodes in the super capacitor are optimized, the working voltage and the specific capacity of the device are simultaneously improved, and the energy density of the super capacitor is improved. At the same time, the obtained capacitor can carry out electrochemical activation process through the metal lithium electrode to stabilize the potential windows so as to enable the super capacitor to have super long cycle life. The super capacitor and the method provided by the invention are simple in technical process, are compatible with a conventional process, and substantially improve the device performance, thereby having quite large application prospect.

Description

technical field [0001] The invention relates to the technical field of supercapacitors for electrochemical energy storage, in particular to a high energy density supercapacitor and a preparation method thereof. Background technique [0002] Supercapacitors, also known as electrochemical capacitors, rely on the adsorption of double-layer ions on the electrode surface or redox reactions to store charges, and their performance is between that of physical capacitors and secondary batteries. Supercapacitors not only have an energy density much higher than that of physical capacitors, they can charge and discharge within seconds, can charge and discharge with high power / current, have a cycle life of tens of thousands of times, and have a charge and discharge efficiency close to 100%. It can be used in the environment (-40 ~ 70 ℃) and has high safety and long-term maintenance-free characteristics, which are incomparable to secondary batteries. These superior properties make superc...

Claims

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Application Information

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IPC IPC(8): H01G11/84H01G11/22
CPCY02E60/13H01G11/84H01G11/22
Inventor 李峰单旭意翁哲宋仁升成会明
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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