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Hybrid supercapacitor based on graphite cathode and zinc anode

A supercapacitor and hybrid technology, which is applied in the field of electrochemical energy storage, can solve the problems of low specific capacity and energy density of hybrid capacitors, and achieve the effects of reducing material costs, high safety, and high energy density

Inactive Publication Date: 2019-05-10
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patented positive electrode carbon material adsorbs anions on its surface through the electric double layer. Density is also lower

Method used

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  • Hybrid supercapacitor based on graphite cathode and zinc anode
  • Hybrid supercapacitor based on graphite cathode and zinc anode
  • Hybrid supercapacitor based on graphite cathode and zinc anode

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Mix natural graphite and binder styrene-butadiene rubber in a mass ratio of 9:1, use a scraper to scrape the mixed slurry on the cleaned aluminum foil positive current collector and scrape a film with a thickness of 150 μm, and cut it into diameters after drying. It is a 12mm positive pole piece. The negative pole piece is made of zinc foil with a diameter of 12mm. 1mol / L concentration of Zn(CF 3 SO 3 ) 2 / acetonitrile solution was used as electrolyte, glass fiber with a diameter of 16.5 mm was used as separator, and 150 μL of electrolyte was added dropwise on the separator. The battery packaging machine is used for packaging, and from bottom to top are the negative electrode shell, the negative electrode piece, the separator, the positive electrode piece, the gasket, the shrapnel, and the positive electrode shell. The assembled hybrid supercapacitors were left to stand at room temperature for 2 hours, and then the electrochemical performance was tested with a blue ...

Embodiment 2

[0039] Mix artificial graphite and binder polyvinylidene fluoride in a mass ratio of 95:5, use a scraper to scrape the mixed slurry on the cleaned aluminum foil positive current collector and scrape a film with a thickness of 150 μm, and cut it after drying. A positive pole piece with a diameter of 12mm. The negative pole piece is a zinc piece with a diameter of 12mm. 0.2mol / L concentration of ZnSO 4 / acetonitrile solution was used as electrolyte, glass fiber with a diameter of 16.5 mm was used as separator, and 150 μL of electrolyte was added dropwise on the separator. The battery packaging machine is used for packaging, and from bottom to top are the negative electrode shell, the negative electrode piece, the separator, the positive electrode piece, the gasket, the shrapnel, and the positive electrode shell. The assembled hybrid supercapacitor was allowed to stand at room temperature for 2 hours to obtain the hybrid supercapacitor described in this example. A cyclic volta...

Embodiment 3

[0041] Mix artificial graphite, binder polytetrafluoroethylene and conductive agent acetylene black in a mass ratio of 85:10:5, and use a scraper to scrape the mixed slurry on the cleaned aluminum foil cathode current collector with a thickness of 150μm. The membrane was dried and cut into positive pole pieces with a diameter of 12 mm. The negative pole piece is made of zinc foil with a diameter of 12mm. 2mol / L concentration of ZnCl 2 / Propylene carbonate solution was used as electrolyte, glass fiber with a diameter of 16.5 mm was used as separator, and 150 μL of electrolyte was dropped on the separator. The battery packaging machine is used for packaging, and from bottom to top are the negative electrode shell, the negative electrode piece, the separator, the positive electrode piece, the gasket, the shrapnel, and the positive electrode shell. The assembled hybrid supercapacitor was allowed to stand at room temperature for 2 hours to obtain the hybrid supercapacitor descri...

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Abstract

The invention belongs to the technical field of electrochemical energy storage and relates to a hybrid supercapacitor based on a zinc anode and a graphite cathode. The hybrid supercapacitor comprisesa cathode, an anode, electrolyte and a diaphragm, wherein a positive active material is graphite, a negative active material is metal zinc, and the electrolyte includes zinc salt electrolyte and an organic solvent. When the hybrid supercapacitor is charged or discharged, a zinc ion deposition / dissolution reaction occurs at the anode, a graphite interlamination negative ion intercalation / deintercalation reaction with pseudocapacitor characteristics occurs at the cathode, specific capacity reaches up to 52mAh / g, and energy density of the hybrid supercapacitor can reach up to 101Wh / kg. The hybridsupercapacitor provided by the invention also has the advantages of low cost, good cycling stability and high safety performance and has a broad application prospect in the energy storage field.

Description

technical field [0001] The invention belongs to the technical field of electrochemical energy storage, and in particular relates to a hybrid supercapacitor composed of a graphite positive electrode, a zinc negative electrode and an organic solvent electrolyte. Background technique [0002] With the development of smart electronic devices, electric vehicles and other fields, people have higher and higher requirements for energy density, fast charging and discharging performance and safety performance of energy storage devices. Lithium-ion batteries are widely used energy storage devices. They have the advantages of high energy density and low self-discharge rate. However, they also have obvious disadvantages. For example, lithium-ion batteries have high cost, poor safety performance, and cannot be quickly charged and discharged. Supercapacitors are a new type of energy storage device between traditional capacitors and secondary batteries. From the perspective of charge storag...

Claims

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Application Information

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IPC IPC(8): H01G11/32H01G11/30H01G11/60H01G11/62H01G11/04H01G11/84
CPCH01G11/04H01G11/30H01G11/32H01G11/60H01G11/62H01G11/84Y02E60/13
Inventor 崔光磊陈政赵井文徐红霞
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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