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Method for realizing energy density maximization of supercapacitor

A supercapacitor and energy density technology, which is applied in the manufacture of hybrid/electric double layer capacitors, etc., can solve the problems of incomplete utilization and achieve the effects of increasing energy density, expanding application fields, increasing specific capacity and working voltage

Inactive Publication Date: 2014-09-24
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

[0007] In order to solve the problem that the high specific capacity of the electrode material in the supercapacitor and the available voltage window of the electrolyte cannot be fully utilized after being assembled into a supercapacitor, the present invention increases the initial voltage of the counter electrode material on the basis of the conventional supercapacitor production process. The step of regulating the chemical potential enables the positive and negative electrodes in the assembled supercapacitor to work in the optimal potential window, which can simultaneously increase the working voltage and specific capacity of the device, thus maximizing the energy density of the device

Method used

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  • Method for realizing energy density maximization of supercapacitor
  • Method for realizing energy density maximization of supercapacitor
  • Method for realizing energy density maximization of supercapacitor

Examples

Experimental program
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Effect test

Embodiment 1

[0033] The test uses graphene as the electrode material (oxygen content 6.5at%, specific surface area 412m 2 / g) and with LiPF 6 The process of ethylene carbonate / dimethyl carbonate solution as the optimal potential point of the electrolyte supercapacitor system is as follows:

[0034] 1) The graphene material is made into two electrode sheets as the working electrode, and the LiPF 6 Ethylene carbonate / dimethyl carbonate solution as electrolyte (where LiPF 6 The concentration is 1mol / L, the volume ratio of ethylene carbonate and dimethyl carbonate is 1:1), and two sets of three-electrode test systems are assembled by using metal lithium sheet as the counter electrode and reference electrode at the same time. One of the three-electrode systems has the upper limit of the available potential window of the electrolyte (4.5VvsLi / Li + ) and multiple selected potential points (0.9, 1.0, 1.1, 1.2, 1.3, 1.4vsLi / Li + ) between the constant current charge and discharge to obtain the ...

Embodiment 2

[0037] Graphene in Example 1 is made into positive and negative electrode sheets with the same quality respectively and used as working electrodes, with the same electrolyte as in Example 1, and a metal lithium sheet is used as a counter electrode and a reference electrode at the same time to assemble three electrodes system. Positive plate at 4.5~1.16VvsLi / Li + After 20 cycles of constant current charge and discharge at a current density of 175mA / g, discharge to 1.16VvsLi / Li + And constant voltage for 12h; the negative plate is at 0.01~1.16VvsLi / Li + After 20 cycles of constant current charge and discharge at a current density of 175mA / g, charge to 1.16V vsLi / Li + And constant pressure 12h. The potential-modulated positive and negative electrode sheets are assembled into a supercapacitor.

[0038] like Figure 4 a and Figure 4 b are the constant current charge and discharge performance of the supercapacitor composed of graphene electrodes before potential regulation (d...

Embodiment 3

[0042] Multi-walled carbon nanotubes (diameter2 / g, oxygen content 4.5at%) made into positive and negative electrodes with the same quality and used as working electrodes, 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 a three-electrode system is assembled by using metal lithium sheet as the counter electrode and reference electrode at the same time. First, the test shows that the optimum potential point in this system is 1.12VvsLi / Li + . Then, the positive plate is at 4.5~1.12VvsLi / Li + After 20 cycles of constant current charge and discharge at a current density of 175mA / g, discharge to 1.12VvsLi / Li + And constant voltage for 12h; the negative plate is at 0.01~1.12VvsLi / Li + After 20 cycles of constant current charge and discharge at a current density of 175mA / g, charge to 1.12VvsLi / Li + And constant pressure 12h. Finally, the poten...

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Abstract

The invention belongs to the field of a supercapacitor of electrochemical energy storage, and discloses a method for realizing energy density maximization of a supercapacitor, for solving the problem of energy density loss caused by high specific capacity of an electrode material and incapability of giving full play to and fully utilizing an available voltage window of an electrolyte in a conventional supercapacitor. Through an electrochemical process, charges are injected to an electrode material to realize electrochemical potential adjustment, and then the adjusted electrode material is assembled to form the supercapacitor, thus working potential windows of a positive electrode and a negative electrode in a device are optimized, the working voltages and specific capacity of the device are improved at the same time, and the energy density maximization of the supercapacitor is realized.

Description

technical field [0001] The invention relates to the field of supercapacitors used for electrochemical energy storage, in particular to a method for maximizing the energy density of supercapacitors. 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 supercapacitors exp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/86
CPCY02E60/13
Inventor 李峰翁哲闻雷成会明
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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