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Method for removing metal ions in electrode material and supercapacitor

A technology of supercapacitors and metal ions, applied in the direction of hybrid capacitor electrodes, non-metallic elements, chemical instruments and methods, etc., can solve problems such as uneven particle size distribution, short device life, and environmental protection treatment pressure, and achieve low process efficiency. low effect

Active Publication Date: 2020-05-08
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are also many new laboratory-scale carbon materials that have been attempted as electrode materials, but in terms of industrial applications, cost and performance are the basic factors for the success of a carbon material
Activated carbon materials currently available on the market include: wood-based activated carbon, coconut shell activated carbon, coal-based activated carbon, etc. These raw materials have a wide range of sources and are cheap, but these carbons are not produced for energy storage, and there are many problems: low purity , high surface group content, uneven particle size distribution, these defects will lead to a very short life of the device
At present, the industrial process adopts the method of oxidation and pickling, and this process uses a large amount of oxidant hydrogen peroxide, nitric acid, and inorganic acid sulfuric acid, hydrochloric acid (EP1176617 (2002) for Honda Motor and Kuraray Co., WO2004011371 (2004) ) for Kuraray Chemical and Honda, US20080201925 (2008) for Maxwell Technologies, WO2008106533 (2008) for Maxwell Technologies), in order to achieve lower metal ion content, the material must be treated repeatedly, which will produce a large amount of acid-containing wastewater, resulting in Great pressure on environmental protection

Method used

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  • Method for removing metal ions in electrode material and supercapacitor
  • Method for removing metal ions in electrode material and supercapacitor
  • Method for removing metal ions in electrode material and supercapacitor

Examples

Experimental program
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Effect test

Embodiment 1

[0068] Wood activated carbon activated by potassium hydroxide or sodium hydroxide was neutralized with dilute nitric acid (concentration) to a surface pH value of 7.0, and then prepared with deionized water to form a water carbon slurry with a solid content of 20 wt%. The ratio of the amount of ozone used in the ozonation process to the volume of the water-charcoal slurry was 1.2 mg / L, and the contact time between the ozone / air flow and the water-charcoal slurry was 20 minutes. The temperature range of the heat treatment of the oxidized water-carbon slurry is 85°C, and the treatment time is 45 minutes. Press filtration removes most of the water without further drying, and the wet sample is directly reconstituted with deionized water to make a water-charcoal slurry. Repeat the ozonation and heat treatment once. The treated carbon material was press-filtered, dried, and then heat-treated at 650° C. for 120 minutes under a nitrogen atmosphere. The content of various metal ions ...

Embodiment 2

[0073] Coconut shell activated carbon activated by potassium hydroxide or sodium hydroxide is neutralized with dilute nitric acid (concentration) to a surface pH value of 7.0, and then prepared with deionized water to form a water-charcoal slurry with a solid content of 20 wt%. The ratio of the amount of ozone used in the ozonation process to the volume of the water-charcoal slurry was 1.2 mg / L, and the contact time between the ozone / air flow and the water-charcoal slurry was 20 minutes. The temperature range of the heat treatment of the oxidized water-carbon slurry is 85°C, and the treatment time is 45 minutes. Press filtration removes most of the water without further drying, and the wet sample is directly reconstituted with deionized water to make a water-charcoal slurry. Repeat the ozonation and heat treatment once. The treated carbon material was press-filtered, dried, and then heat-treated at 750° C. for 60 minutes under a nitrogen atmosphere. The content of various me...

Embodiment 3

[0078] The coal-based activated carbon activated by potassium hydroxide or sodium hydroxide is neutralized with dilute nitric acid (concentration) to a surface pH value of 7.0, and then prepared with deionized water to form a water-carbon slurry with a solid content of 20 wt%. The ratio of the amount of ozone used in the ozonation process to the volume of the water-charcoal slurry was 1.2 mg / L, and the contact time between the ozone / air flow and the water-charcoal slurry was 20 minutes. The temperature range of the heat treatment of the oxidized water-carbon slurry is 85°C, and the treatment time is 45 minutes. Press filtration removes most of the water without further drying, and the wet sample is directly reconstituted with deionized water to make a water-charcoal slurry. Repeat the ozonation and heat treatment once. The treated carbon material was press-filtered, dried, and then heat-treated at 850° C. for 30 minutes under a nitrogen atmosphere. The content of various met...

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Abstract

The invention relates to a method for removing metal ions in an electrode material and a supercapacitor. The invention belongs to the technical field of new energy materials, and solves the problem that the existing process of removing metal ions requires repeated treatment of the material, which generates a large amount of acid-containing wastewater and which causes great environmental protectiontreatment pressure, and the problem of the technical requirement that the concentration sum of the metal ions in a super-capacitor electrode carbon material is smaller than 200 ppm cannot be met dueto the fact that the concentration sum of the metal ions in the electrode material treated through the existing technology is too high. The method for removing the metal ions in the electrode materialcomprises the following steps: 1, preparing water carbon slurry; 2, carrying out surface oxidation treatment on the raw material carbon in the water carbon slurry by adopting an ozone contact oxidation method; and 3, carrying out heating treatment on the water-carbon slurry subjected to ozone contact treatment. By means of ozone contact oxidation and heating treatment, the sum of the content of various metal ions is removed to the level smaller than 60 ppm.

Description

technical field [0001] The invention relates to the technical field of new energy materials, in particular to a method for removing metal ions in electrode materials and a supercapacitor. Background technique [0002] At present, with the rapid growth of energy consumption, various environmental and sustainable development issues have become increasingly prominent. If these problems are to be solved, energy storage and energy management are key technologies. A supercapacitor, or double-layer capacitor (EDLC), is an electrochemical energy storage device that can store far more energy than conventional electrolytic capacitors. Supercapacitors can be regarded as symmetrical carbon-carbon electrochemical capacitors, and their unique properties are based on nanoscale capacitors based on polarized electrode materials and ion layers adsorbed on their surfaces. Supercapacitors are capable of harvesting energy for extremely short periods of time and then releasing it as needed. In...

Claims

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Application Information

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IPC IPC(8): H01G11/32H01G11/34C01B32/378
CPCC01B32/378H01G11/32H01G11/34Y02E60/13
Inventor 李峰波袁国卿
Owner INST OF CHEM CHINESE ACAD OF SCI
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