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CN-122000369-A - Electrode continuous modification method and modification device

CN122000369ACN 122000369 ACN122000369 ACN 122000369ACN-122000369-A

Abstract

The invention relates to a continuous electrode modification method and a modification device, wherein the method comprises the steps of arranging a carbon felt electrode on a roller, and sequentially arranging the carbon felt electrode in a first modification groove and a first cleaning groove through the roller to respectively carry out first modification and first cleaning; the method comprises the steps of carrying out first spraying and first purging through a spraying device and a purging device in sequence after first cleaning, carrying out second modification and second cleaning through the first purging and placing the carbon felt electrode in a second modification tank and a second cleaning tank in sequence after first purging, carrying out second spraying and second purging through the spraying device and the purging device in sequence after second cleaning, and carrying out heat treatment on the carbon felt electrode after second purging to obtain the modified carbon felt electrode. The electrode is cleaned after being modified, so that the pollution of the previous-stage modification solution to the next-stage modification solution can be avoided, and the modification effect is improved.

Inventors

  • WU TIANHAO
  • YANG ZHIYAO
  • YAO ZHEN
  • CHEN GUODONG

Assignees

  • 国家能源投资集团有限责任公司
  • 北京低碳清洁能源研究院

Dates

Publication Date
20260508
Application Date
20241106

Claims (10)

  1. 1. A method for continuously modifying an electrode, the method comprising: Arranging a carbon felt electrode (1) on a roller (2), and sequentially arranging the roller (2) in a first modification tank (5) and a first cleaning tank (6) to respectively carry out first modification and first cleaning; After the first cleaning, the first spraying and the first blowing are respectively carried out through a spraying device (10) and a blowing device (12) in sequence; after the first purging, the wastewater is sequentially placed in a second modification tank (7) and a second cleaning tank (8) to be subjected to second modification and second cleaning respectively; after the second cleaning, respectively performing second spraying and second blowing through a spraying device (10) and a blowing device (12) in sequence; and carrying out heat treatment on the carbon felt electrode after the second blowing to obtain a modified carbon felt electrode.
  2. 2. The method according to claim 1, wherein the first modification tank (5) is filled with a first modification solution and the second modification tank (7) is filled with a second modification solution; The first modification solution and the second modification solution are respectively and independently one of hydrogen peroxide solution, boric acid solution, potassium permanganate solution, sulfuric acid solution, nitric acid solution and Fenton reagent; the first cleaning tank (6) and the second cleaning tank (8) are respectively and independently filled with pure water.
  3. 3. The method according to claim 2, wherein the first modifying solution is preferably a hydrogen peroxide solution having a concentration of 15-30%, and the second modifying solution is preferably a boric acid solution having a concentration of 1-5mol/L.
  4. 4. The method according to claim 2, wherein the liquid level heights h of the first modification solution, the second modification solution, and the pure water are calculated according to the following formulas, respectively: Wherein v is the moving speed of the carbon felt electrode on the roller, t is the modifying time or cleaning time, r is the radius of the roller, and h 1 is the distance from the center of the roller to the bottom of the modifying tank or cleaning tank.
  5. 5. The method according to claim 4, wherein the distance from the center of the roller to the bottom of the modifying tank or cleaning tank is 0.5-0.8m, and the radius of the roller is 0.3-0.5m.
  6. 6. The method according to claim 4, wherein the modification time is 2 to 5 hours and the washing time is 3 to 6 hours.
  7. 7. The method of claim 4, wherein the carbon felt electrode is moved over the roller at a speed of 0.02-0.05m/min.
  8. 8. The method of claim 1, wherein the heat treatment temperature is 300-600 ℃ for 2-6 hours.
  9. 9. The electrode continuous modification device is characterized by comprising a carbon felt electrode (1), a roller (2), a tank body (3), a partition board (4), a spraying device (10) and a blowing device (12), wherein the tank body (3) comprises a first modification tank (5), a first cleaning tank (6), a second modification tank (7) and a second cleaning tank (8) which are horizontally arranged in sequence; The carbon felt electrode (1) is arranged on the roller (2), and the roller (2) drives the carbon felt electrode (1) to move vertically; The first modification tank (5) and the first cleaning tank (6), and the second modification tank (7) and the second cleaning tank (8) are respectively separated by the partition board (4); The first cleaning tank (6) and the second cleaning tank (8) are respectively provided with the spraying device (10), and the purging device (12) is arranged above the spraying device (10).
  10. 10. The device according to claim 9, wherein the spraying device (10) comprises a magnetic pump (9), a flushing pipe (11) and a spray head, wherein the flushing pipe (11) is arranged on the partition board (4), the spray head is arranged on the flushing pipe (11), and a plurality of spray nozzles are arranged on the spray head; the purge device (12) includes a gas line, a pressure relief valve, and a gas outlet.

Description

Electrode continuous modification method and modification device Technical Field The invention relates to the technical field of electrode materials, in particular to a continuous electrode modification method and a continuous electrode modification device. Background As a novel electrochemical energy storage device capable of being applied on a large scale, the all-vanadium redox flow battery has the advantages of flexible design, high safety, long service life and the like. In a battery assembly, an electrode is used as a place where oxidation-reduction reaction of vanadium ions in different valence states occurs in an electrolyte, and is a key component affecting the performance of the battery. Most of the electrode materials used in the current vanadium redox flow battery are porous carbon materials such as carbon felt, graphite felt, carbon cloth, carbon paper and the like. However, such materials also suffer from the disadvantage of poor electrochemical activity, affecting cell performance. In order to improve the battery performance, modification of the electrode material is unavoidable, and the prior art generally includes surface treatment of the electrode material and supporting of a catalyst. The surface treatment can increase the specific surface area of the electrode material or increase oxygen-containing hanging energy groups by chemical etching, heat treatment, electrochemical oxidation and other methods so as to increase the active sites on the surface of the electrode, thereby improving the efficiency of the battery. The supported catalyst reduces the reaction barrier by introducing metal, metal oxide and carbon nano material, thereby improving the battery efficiency. Patent CN115538148a discloses a treatment method for modifying electrode materials of an all-vanadium redox flow battery, namely, carbon felt raw materials sequentially pass through a plurality of treatment tanks, cleaning tanks and graded heat treatment systems of treatment equipment, so that continuous switching among multiple modification treatment procedures of carbon felt electrodes is realized, an original intermittent treatment mode is avoided, and complicated operation procedures are omitted. However, the existing method has no cleaning device among the modification procedures, so that the former-stage modification solution is easily brought into the latter-stage modification solution along with the movement of the electrode, the pollution to the latter-stage modification solution is caused, the uncertainty is increased to the modification treatment process due to the pollution, the modification effect is unstable, the waste after the pollution of the modification solution is caused, and the frequency and the cost for replacing the solution are increased. In addition, in the prior art, a grading modification procedure that the electrode passes through each modification tank body in the horizontal direction is adopted, and a method that flexible sealing strips and carbon felts are mutually stuck is adopted for sealing. Because the carbon felt is soft, the bonding is not tight, and the risk of seepage and leakage of the modified solution from the tank body is easily caused. Disclosure of Invention The invention aims to provide a continuous electrode modification method and a continuous electrode modification device, which avoid pollution of a previous stage modification solution to a next stage modification solution, improve the modification effect, reduce the replacement times of the modification solution, reduce the cost and simultaneously avoid leakage or leakage of the modification solution. In order to achieve the above object, an aspect of the present invention provides a method for continuously modifying an electrode, the method comprising: Arranging a carbon felt electrode on a roller, and sequentially arranging the roller in a first modification tank and a first cleaning tank to respectively carry out first modification and first cleaning; after the first cleaning, respectively performing first spraying and first purging by sequentially passing through a spraying device and a purging device; Sequentially placing the first cleaned water in a second modification tank and a second cleaning tank to respectively carry out second modification and second cleaning; after the second cleaning, respectively performing second spraying and second blowing through a spraying device and a blowing device in sequence; and carrying out heat treatment on the carbon felt electrode after the second blowing to obtain a modified carbon felt electrode. Optionally, a first modification solution is filled in the first modification tank, a second modification solution is filled in the second modification tank, the first modification solution and the second modification solution are respectively and independently one of hydrogen peroxide solution, boric acid solution, potassium permanganate solution, sulfuric acid solution, nitric acid solu