A kind of supercapacitor and preparation method thereof

A technology of supercapacitors and capacitors, applied in the field of capacitors, can solve the problems of high energy density of lithium-ion batteries, low working potential of supercapacitors, and low energy density of capacitors at the same time, so as to reduce the probability of dissolution, reduce particle size, Effect of reducing internal resistance

Active Publication Date: 2019-06-07
重庆弗迪电池研究院有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of supercapacitor has low working potential, low capacitor energy density, and poor practicability
[0007] The patent with publication number WO2011103708 A1 discloses a supercapacitor in which the positive electrode uses a mixture of lithium ion intercalation compound and porous carbon material, the negative electrode uses hard carbon, and the electrolyte uses a non-aqueous organic solvent electrolyte containing lithium ions. This type of supercapacitor It has the same problem as the above-mentioned patent, and it cannot take into account the excellent characteristics of the high energy density of lithium-ion batteries and the high power density of traditional supercapacitors at the same time.

Method used

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  • A kind of supercapacitor and preparation method thereof
  • A kind of supercapacitor and preparation method thereof

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preparation example Construction

[0048] The second aspect of the present invention provides a method for preparing a supercapacitor, the method comprising: selecting a lithium-containing metal oxygen-containing compound as the positive electrode active material; performing delithiation pretreatment on the positive electrode active material, and then using the pretreated The positive electrode is obtained by coating the positive electrode active material on the positive electrode current collector; or the positive electrode is obtained by coating the positive electrode active material on the positive electrode current collector and then performing pre-delithiation treatment; the negative electrode active material is coated on the negative electrode current collector to obtain the negative electrode ; The supercapacitor is composed of the positive electrode, the negative electrode, the diaphragm and the electrolyte; wherein, controlling the conditions of the delithiation pretreatment makes the electrode potential...

Embodiment 1

[0068] The supercapacitor S1 was prepared by adopting the basic preparation process of the aforementioned supercapacitor, wherein the metal oxygen-containing compound containing lithium is nickel-cobalt lithium manganese oxide with a grain size of about 500 nanometers, the negative electrode active material is graphene, and the electrolyte solution is 1mol / L solution of lithium hexafluorophosphate in ethylene carbonate.

[0069] In addition, the positive electrode active material of the supercapacitor is pretreated by wet oxidation delithiation, and the reaction equation is as follows:

[0070] LiMO+x / 2Na 2 S 2 o 8 → Li 1-x MO+x / 2Na 2 SO4 +x / 2Li 2 SO 4 ;

[0071] M is at least one of Ni, Co, Mn, Fe, P, Mg, Al, Ti and other elements.

[0072] The specific process is as follows:

[0073] Li(Ni 1 / 3 co 1 / 3 mn 1 / 3 )O 2 with 1 L Na 2 S 2 o 8 The aqueous solution (0.25mol / L) was mixed evenly, and reacted at room temperature for 48 hours so that Li(Ni 1 / 3 co 1 / 3 mn...

Embodiment 2

[0076] The supercapacitor S2 was prepared by adopting the basic preparation process of the aforementioned supercapacitor, wherein the lithium-containing metal oxygen compound is lithium manganate with a grain size of about 2 microns, the negative electrode active material is activated carbon, and the electrolyte is 1.1mol / L A solution of lithium bis(fluorosulfonyl)imide in propylene carbonate. The metal oxygen-containing compound containing lithium is lithium manganate, and the positive electrode active material is doped with 5% by mass of titanium dioxide. In addition, the positive electrode active material of the supercapacitor is pretreated by electrochemical delithiation, and the specific process is as follows:

[0077] The positive electrode material is made into a positive electrode sheet, and after being assembled into a lithium-ion battery with a graphite negative electrode sheet, a diaphragm, and an electrolyte solution of 0.8mol / L bis(fluorosulfonyl)imide lithium eth...

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Abstract

The invention discloses a super capacitor and a preparation method thereof. The super capacitor comprises a positive pole, a negative pole, a separator and electrolyte. The positive pole comprises a positive pole current collector and a positive pole active material coated on the positive pole current collector, the negative pole comprises a negative pole current collector and a negative pole active material coated on the negative pole current collector, and the positive pole active material is a metal oxygen-containing compound containing lithium. The super capacitor is characterized in that the positive pole active material is subjected to lithium deintercalation pretreatment, and the electrode potential of the positive pole Vs.Li+ / Li of the super capacitor is 3.2-6.0 volts. The super capacitor is high in energy density and multiplying power, and is long in cycle life.

Description

technical field [0001] The invention relates to the field of capacitors, in particular to a supercapacitor and a preparation method thereof. Background technique [0002] Supercapacitor is a new type of energy storage device, which has the characteristics of high power density, short charging time, long service life, good temperature characteristics, energy saving and environmental protection, so it has a wide range of uses. [0003] According to different energy storage principles, supercapacitors can be divided into three categories: electric double layer capacitors (EDLC), Faraday quasi-capacitance supercapacitors and hybrid supercapacitors. According to the electrolyte, supercapacitors can be divided into three types of supercapacitors: inorganic electrolytes, organic electrolytes, and polymer electrolytes. [0004] According to E=1 / 2CV 2 It can be seen that increasing the voltage is of great help to increase the energy density of the capacitor. Supercapacitors use or...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G11/46H01G11/50
CPCY02E60/13
Inventor 江文锋曾彪颜海鹏张淑静
Owner 重庆弗迪电池研究院有限公司
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