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Pretreatment device and pretreatment method for electrode active material for supercapacitor

A technology of electrode active materials and supercapacitors, applied in the manufacture of hybrid/electric double layer capacitors, etc., can solve the problem of insufficient cycle life of monomers, and achieve the effect of high capacity and low surface functional group content

Active Publication Date: 2016-12-21
DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the electrification and aging process of this technical solution, more active functional groups on the electrodes will irreversibly react with the electrolyte, and various mixed gases generated will be discharged from the electrolyte. However, due to the deterioration of the electrode during the aging process, the cycle life of the monomer will still be insufficient
Kiyoshi Horita et al. proposed in [J].Carbon,1996,34(2),217–222 that by modifying the surface state of carbon black, the functional groups on the surface of carbon black are changed from hydrophobicity to hydrophilicity, containing hydrophilic functional groups High-quality carbon black is easy to stir into a slurry in water, but whether it is a hydrophobic functional group or a hydrophilic functional group, it will irreversibly react with the electrolyte during the aging process of the supercapacitor, resulting in multiple failure modes such as monomer swelling

Method used

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  • Pretreatment device and pretreatment method for electrode active material for supercapacitor
  • Pretreatment device and pretreatment method for electrode active material for supercapacitor

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Take by weighing 1000 grams of activated carbon for supercapacitors and add them to the positive electrode area and the negative electrode area of ​​the reactor stack respectively, seal the reactor stack, and vacuumize the reactor stack to -0.098MPa with a vacuum pump; inject 2000 MPa into the reactor stack with a liquid injection pump The solution of gram 1M tetraethylammonium tetrafluoroboric acid in acetonitrile, stir the positive electrode region and the negative electrode region of the reactor pile with a stirrer respectively, make the supercapacitor use activated carbon and the solution of 1M tetraethylammonium tetrafluoroboric acid in acetonitrile to form a solid A slurry with a content of 33.3wt%; adjust the temperature of the constant temperature water bath to 60°C, and after the temperature of the reactor pile is stable, connect the positive electrode current collector and the negative electrode collector of the reactor pile with a charge and discharge tester, a...

Embodiment 2

[0028]Weigh 1,000 grams of graphene and add them to the positive and negative regions of the reactor stack, seal the reactor stack, and use a vacuum pump to evacuate the reactor stack to -0.098MPa; inject 1,500 grams of 1M into the reactor stack with a liquid injection pump. For the solution of tetraethylammonium tetrafluoroboric acid in propylene carbonate, stir the positive electrode area and the negative electrode area of ​​the reactor pile with a stirrer respectively, so that the solution of graphene and 1M tetraethylammonium tetrafluoroboric acid in propylene carbonate forms a solid Content is the slurry of 40wt%; Regulate the temperature of constant temperature water bath to 70 ℃, after the reactor stack temperature reaches stable, connect the positive electrode collector and the negative electrode collector of the reactor stack with the charge and discharge tester, the reactor stack is constant Flow charge to 2.5V, then charge the reactor pile at a constant voltage of 2....

Embodiment 3

[0031] Weigh 1,000 grams of activated carbon fibers and add them to the positive and negative regions of the reactor stack, seal the reactor stack, and vacuum the reactor stack to -0.098MPa with a vacuum pump; inject 3,000 grams of 1M into the reactor stack with a liquid injection pump. The solution of triethylmethylammonium tetrafluoroboric acid in propylene carbonate, stir the positive electrode area and the negative electrode area of ​​the reactor stack with a stirrer respectively, so that activated carbon fiber and 1M triethylmethylammonium tetrafluoroboric acid are mixed in propylene carbonate The solution in the solution forms a slurry with a solid content of 25wt%; adjust the temperature of the constant temperature water bath to 70 ° C, and after the temperature of the reactor stack is stable, connect the positive electrode current collector and the negative electrode current collector of the reactor stack with a charge and discharge tester. Charge the reactor pile with ...

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Abstract

The invention relates to a pretreatment device and a pretreatment method for an electrode active material for a supercapacitor, and belongs to the technical field of new energy storage. The pretreatment device comprises a reaction electric pile, a vacuum pump, a charge and discharge tester, a constant temperature water bath, a liquid charge pump and stirrers. The pretreatment method can effectively solve the problems of low single body capacity, large internal resistance and poor cycle life and the like due to high content of surface functional groups of the electrode active material for the supercapacitor, and severe core gas generation caused after aging test, thereby obtaining the supercapacitor electrode active material, which is low in content of the surface functional groups, does not bulge after aging or high-temperature load test, and is high in capacity, low in internal resistance and long in cycle life.

Description

technical field [0001] The invention relates to a pretreatment device for electrode active materials used in supercapacitors and a method for pretreatment of electrode active materials using the device. Background technique [0002] The surface of electrode active materials for commercial supercapacitors is usually enriched with more active functional groups, especially the electrode active materials prepared by chemical activation. If the electrode active material containing more active functional groups is prepared into an electrode and further assembled into a supercapacitor monomer, as long as the assembled monomer is subjected to aging or high temperature load test, the active functional group on the surface of the electrode active material will have an irreversible interaction with the electrolyte. The reaction generates a variety of mixed gases that cause rapid deterioration of the active material layer on the electrode, so that the supercapacitor monomer exhibits mul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G11/86
CPCY02E60/13H01G11/86
Inventor 郭义敏何凤荣张显袁媛郭德超张啟文
Owner DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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