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Hybrid super capacitor

A supercapacitor and hybrid technology, which is applied in the direction of hybrid capacitor electrolyte, etc., can solve the problems of affecting cycle stability and reducing the energy density of hybrid energy storage devices, and achieve good cycle stability, high energy density, and low price.

Active Publication Date: 2018-04-13
刘小林
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, on the basis of zinc-ion batteries, an energy storage device combining zinc-ion batteries and supercapacitors has been developed. The energy storage device uses metal zinc and activated carbon as negative electrodes, composite metal oxides and activated carbon as positive electrodes, Zinc aqueous solution is used as the electrolyte. This energy storage device not only makes up for the shortcomings of insufficient energy density and high price of traditional supercapacitors, but also has obvious advantages in rate performance and cycle stability compared with zinc-ion batteries. However, However, the disadvantage is that the deposition and stripping potential of zinc ions in aqueous solution is significantly lower than that of hydrogen gas, so even if metal zinc has a large hydrogen evolution overpotential, the side reaction between metal zinc and water cannot be avoided, which seriously affects the process. cycle stability of this kind of hybrid energy storage device; on the other hand, the use of water as the electrolyte solvent is also limited by the water decomposition voltage, and the decomposition voltage of water in the standard state is 1.23V. The highest voltage generally does not exceed 1.6V, which further reduces the energy density of the hybrid energy storage device

Method used

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Examples

Experimental program
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Embodiment 1

[0067] Preparation of the positive electrode: first make the binder sodium carboxymethyl cellulose into a water dispersion with a mass percentage of 3%, and activate carbon (with a specific surface area of ​​about 2400m 2 / g), acetylene black and sodium carboxymethyl cellulose are mixed in the ratio of 70:10:20 by mass ratio, stir evenly in the high-speed mixer, the gained mixture is evenly coated on the graphite conductive paper surface, moves in the vacuum oven to Take it out after drying, and cut it to get the positive electrode sheet;

[0068] Preparation of electrolyte: Dissolve 10.58g of zinc perchlorate in 100mL of a mixed solution of propylene carbonate, acetonitrile and diethyl carbonate (the volume ratio of the three is 4.5:4.5:1), and prepare a 0.4mol / L solution. get the electrolyte.

[0069] The prepared positive electrode sheet is used as the positive electrode, the zinc foil is used as the negative electrode, the propylene carbonate / acetonitrile / diethyl carbonat...

Embodiment 2

[0072] Preparation of the positive electrode: First, the binder polyvinylidene fluoride is made into a polyvinylpyrrolidone dispersion liquid with a mass percentage of 5%, and graphene oxide (sheet diameter is 0.3-1 micron), acetylene black and polyvinylidene fluoride are mixed by mass After mixing at a ratio of 70:20:10, stir evenly in a high-speed mixer, and apply the obtained mixture evenly on the surface of the conductive polyethylene film, move it into a vacuum oven until it is dried, take it out, and cut it to obtain the positive electrode sheet;

[0073] Preparation of negative electrode: After mixing zinc powder (about 400 mesh), zinc oxide powder and polyvinylidene fluoride in a mass ratio of 60:30:10, stir evenly in a high-speed mixer, and coat the obtained mixture evenly on brass foil surface, move it into a vacuum oven until it is dried, take it out, and cut it to get the negative electrode sheet;

[0074] Preparation of electrolyte: 5.29g of zinc perchlorate and 5...

Embodiment 3

[0078] Preparation of the positive electrode: first make the binder sodium carboxymethyl cellulose into a water dispersion with a mass percentage of 3%, and activate carbon (with a specific surface area of ​​about 2400m 2 / g), graphene (approximately 0.3-1 micron in sheet diameter), acetylene black and sodium carboxymethyl cellulose are mixed in a ratio of 78:2:15:5 by mass, and stirred evenly in a high-speed mixer, and the resulting mixture Evenly spread on the surface of titanium foil, move it into a vacuum oven until it is dried, take it out, and cut it to get the positive electrode sheet;

[0079] Preparation of electrolyte solution: Dissolve 18.18g of zinc trifluoromethanesulfonate in 100mL of a mixture of propylene carbonate and N,N-dimethylformamide (the volume ratio of the two is 1:1), and prepare 0.5mol / The solution of L, obtains electrolyte;

[0080] The prepared positive electrode sheet was used as the positive electrode, the zinc foil was used as the negative ele...

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Abstract

The invention discloses a hybrid super capacitor. The capacitor comprises an electrolyte, a positive electrode, a negative electrode and an isolation film, wherein the positive electrode and the negative electrode are disposed in the electrolyte; a mixture of a positive electrode active substance, a positive electrode conductive agent and a positive electrode binder coats a positive electrode current collector, so that the positive electrode can be prepared; the positive electrode active substance contains a carbon material; the negative electrode active substance of the negative electrode contains a zinc element; and the electrolyte includes zinc salt and a non-proton high-polarity organic solvent. The prices of the materials of the hybrid super capacitor of the invention are relatively low; and the capacitor has high energy density and cycle stability and can be widely applied to fields such as new energy storage, smart grid, electric bus and automobiles start-stop fields.

Description

technical field [0001] The invention belongs to the field of electrochemical energy storage devices, in particular to a zinc ion hybrid supercapacitor. Background technique [0002] Energy is an important pillar for human survival and development. At present, the supporting energy storage devices include lithium-ion batteries, lead-acid batteries, nickel-metal hydride batteries, and flow batteries. [0003] Because lithium-ion batteries have the advantages of high energy density and low self-discharge rate, lead-acid batteries also have the advantage of low price, so lithium-ion batteries and lead-acid batteries have become the most widely used secondary batteries at present. Secondary batteries also have obvious disadvantages. For example, lithium-ion batteries have high cost and poor rate performance; lead-acid batteries have short service life and serious lead pollution. [0004] Zinc-ion battery is a type of battery that uses metal zinc as the negative electrode, mangan...

Claims

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Application Information

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IPC IPC(8): H01G11/60H01G11/62
CPCH01G11/60H01G11/62Y02E60/13
Inventor 刘小林
Owner 刘小林
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