Purifying process for graphene material of energy storing device

A graphene and device technology, which is applied in the field of impurity removal technology of graphene materials of energy storage devices, can solve the problems of reducing the self-discharge retention rate, shortening the service life of energy storage devices, short-circuiting of devices, etc., and achieves good self-discharge retention rate, The effect of reducing heavy metal content and simple and orderly process

Inactive Publication Date: 2012-08-08
THE SIXTH ELEMENT CHANGZHOU MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of using alkali metal hydroxides to activate and manufacture graphene, because hydroxides are highly corrosive at high temperatures, they can corrode the activation furnace body, and a large amount of heavy metals are mixed into the activated graphene materials. (such as Al, Ni, Cr, Zn and Cu, etc.) and alkali metal (Na and K) impurities. These metal compounds formed at high temperature have complex structures and stable properties. It is difficult to completely remove the above-mentioned metal compound impurities by simple water washing. Generally, after the existing impurity removal technology, the content of heavy metal ions is greater than 1000 ppm, and the content of alkali metal ions is greater than 3000 ppm
After the graphene material con

Method used

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Examples

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Embodiment 1

[0023] The impurity removal process for the graphene material of the energy storage device proposed by the present invention comprises the following steps:

[0024] (1) Wash the graphene obtained by the strong alkali activation treatment with deionized water at 30 °C;

[0025] (2) Then repeatedly remove impurities and wash with 30 ℃ hydrochloric acid washing solution, the concentration is 10 wt%;

[0026] (3) Repeated washing with deionized water at 30°C;

[0027] (4) Finally, the graphene is calcined at a high temperature of 500° C. for 10 hours to obtain a high-purity graphene powder.

Embodiment 2

[0029] The basic steps of the impurity removal process for the graphene material of the energy storage device proposed by the present invention are the same as those in Example 1, but the selected components, temperature, concentration and process time are different from those in Example 1, as follows:

[0030] The temperature of the deionized water was 60°C.

[0031] The selected acidic washing solution is hydrochloric acid containing hydrogen peroxide, the temperature is 60 °C, and the concentration is 10 wt%.

[0032] The temperature of high temperature calcination is 800°C, the time is 5 hours, and the protective gas is nitrogen.

Embodiment 3

[0034] The basic steps of the impurity removal process for the graphene material of the energy storage device proposed by the present invention are the same as those in Example 1, but the selected components, temperature, concentration and process time are different from those in Example 1, as follows:

[0035] The temperature of deionized water was 80°C.

[0036] The selected acidic washing solution is a hydrochloric acid solution containing ammonium chloride, the temperature is 80 °C, and the concentration is 15 wt%.

[0037] The temperature of high temperature calcination is 1000°C, the time is 2 hours, and the protective gas is nitrogen, argon and neon.

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Abstract

The invention discloses a purifying process for a graphene material of an energy storing device, and further relates to a purifying and washing process for a graphene material of energy storing devices such as a super capacitor, a secondary lithium ion battery and the like. The purifying process disclosed by the invention comprises the following steps of: washing graphene obtained by activating with a strong alkali with deionized water of over 30 DEG C; repeatedly purifying and cleaning with a cleaning solution of over 30 DEG C; repeatedly washing with deionized water of over 30 DEG C; and calcining the graphene at the high temperature of 500-1,200 DEG C for 0.5-10 hours to obtain high-purity graphene powder. The process flow is simple and ordered, every joint in the flow can be controlled accurately, the content of heavy metal ions can be lowered to be below 300 ppm after purification, and the content of the alkali metal ions can be lowered to be below 1,500 ppm; and the purifying process is particularly suitable for large-scale production.

Description

technical field [0001] The invention discloses an impurity removal process, and furthermore, relates to an impurity removal process for graphene materials of energy storage devices. Background technique [0002] Graphene is suitable as an active material for energy storage due to its extremely high specific surface area for secondary lithium-ion batteries and supercapacitors. However, in the process of using alkali metal hydroxides to activate and manufacture graphene, because hydroxides are highly corrosive at high temperatures, they can corrode the activation furnace body, and a large amount of heavy metals are mixed into the activated graphene materials. (such as Al, Ni, Cr, Zn and Cu, etc.) and alkali metal (Na and K) impurities. These metal compounds formed at high temperature have complex structures and stable properties. It is difficult to completely remove the above-mentioned metal compound impurities by simple water washing. Generally, after treatment by the existi...

Claims

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Application Information

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IPC IPC(8): C01B31/04C01B32/196
Inventor 刘琼馨温祝亮王振中瞿研
Owner THE SIXTH ELEMENT CHANGZHOU MATERIALS TECH
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