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Graphite felt treatment process

A treatment process, graphite felt technology, applied in the field of material science and engineering, can solve problems such as harmful effects on battery performance, and achieve the effect of simple treatment process

Inactive Publication Date: 2018-10-02
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because ordinary graphite felt contains some impurities such as metal impurities, organic impurities, etc., the existence of these impurities will have a harmful effect on the performance of the battery. Therefore, when using graphite felt to make zinc series batteries, graphite felt must be treated before it can be used.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Remove organic matter; anneal the graphite felt at a temperature of 500-900° C. for 5-15 minutes;

[0025] (2) Remove general impurities; place the graphite felt treated in step (1) in No. 1 solution (SC-1), treat it at a temperature of 70-80°C for 5-10 minutes, and then clean it with deionized water for 5- 10 minutes; Next, use No. 2 solution (SC-2), treat at 70-80°C for 5-10 minutes, and then wash with deionized water for 5-10 minutes.

[0026] (3) Removing trace metal impurities that are difficult to remove; placing the graphite felt treated in step (2) in a microwave oven for 5-15 minutes.

[0027] Among them, the formula of No. 1 liquid is NH by volume 3 ·H 2 O: H 2 o 2 :H 2 The ratio of O is 1:2:5, and the formulation of No. 2 liquid is HCl:H by volume 2 o 2 :H 2 The ratio of O is 1:2:8.

[0028] Use the graphite felt processed by the above process, with 1M ZnI2 aqueous solution as the electrolyte, add alcohol with a volume of 1 / 10, and add a certain ...

Embodiment 2

[0030] Method is identical with embodiment 1;

[0031] The No. 1 liquid formula used is NH by volume 3 ·H 2 O: H 2 o 2 :H 2 The ratio of O is 1:1:4, and the formula of No. 2 liquid is 1:1:6 by volume.

[0032] Use the graphite felt processed by the above process, with 1M ZnI2 aqueous solution as the electrolyte, add alcohol with a volume of 1 / 10, and add a certain amount of iodine (2 times the molar number of zinc iodide at the positive electrode, with a cation exchange membrane as Diaphragm: It is protected by glass fiber cloth, and the graphite felt treated by this process is used as an electrode material to form a zinc-iodine battery.

[0033] Moreover, the cycle capacity of this battery charge and discharge can also be as long as thousands of times. This kind of battery has no over-discharge problem, because even after over-discharge, it is easy to recover according to the current-limiting and voltage-limiting mode, which is beyond the reach of most secondary batteri...

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Abstract

The invention discloses a graphite felt treatment process including steps of: 1) organic substance removal: annealing the graphite felt at 500-900 DEG C for 5-15 min; 2) removal common impurities: treating the graphite felt in a first solution (SC-1) at 70-80 DEG C for 5-10 min, and washing the graphite felt for 5-10 min in deionized water, then treating the graphite felt in a second solution (SC-2) at 70-80 DEG C for 5-10 min, and washing the graphite felt for 5-10 min in deionized water; (3) removal of stubborn trace metal impurities: treating the graphite felt in a microwave oven for 5-15 min. The treatment process is simple and can remove the organic substances and metal impurities from the graphite felt. The processed graphite felt can be used for producing zinc-bromine or zinc-iodinebatteries.

Description

technical field [0001] The invention relates to a treatment process of graphite felt, which belongs to the field of material science and engineering. Background technique [0002] In order to increase the current density, zinc-series batteries (such as zinc-bromine batteries or zinc-iodine batteries) often use graphite felt (also known as carbon felt or carbon felt) structure to make electrodes, which can increase the specific surface area of ​​the electrode on the one hand and prevent branching. Crystal plays a certain auxiliary role. [0003] In fact, graphite felt is mainly composed of carbon fiber, and the keel is mainly glass (silicon dioxide). Taking polyacrylonitrile-based stone grinding station (also known as carbon felt) as an example, the area weight is 500g / m 2 and 1000g / m 2 , longitudinal and transverse strength (N / mm 2 ) are 0.12, 0.16 and 0.10, 0.12 respectively, the elongation at break is 3%, 4% and 18%, 16%, and the resistivity (Ω·mm) is 4~6, 3.5~5.5 and 7...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M10/36H01M10/38
CPCH01M4/583H01M10/365H01M10/38Y02E60/10Y02P70/50
Inventor 施方尧申南熙许春芳王连卫付月徐少辉朱一平熊大元陈少强
Owner EAST CHINA NORMAL UNIV
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