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CN-121983592-A - Flow battery electrode and application and treatment method thereof

CN121983592ACN 121983592 ACN121983592 ACN 121983592ACN-121983592-A

Abstract

The invention discloses a flow battery electrode and an application and a treatment method thereof, wherein the treatment method comprises the steps of S100, clamping and fixing a carbon felt under the condition of a compression ratio of 25-35% and drying to form a preset stress structure, S200, placing the carbon felt after stress presetting in a tube furnace, carrying out gradient heating heat treatment, simultaneously controlling the air flow velocity in the tube furnace along the flowing direction of electrolyte to enable the air flow velocity of the region at the inlet side of the corresponding electrolyte to be 1.8-2.2 times of the air flow velocity of the region at the outlet side of the corresponding electrolyte, S300, introducing saturated steam, treating for 2.0-2.5 hours under the condition of 135-145 ℃, then carrying out gradient drying to room temperature, and then cooling to the room temperature. The technical scheme of the invention aims to improve the energy efficiency and the cycling stability of the electrode of the all-vanadium redox flow battery.

Inventors

  • LI ZIDONG
  • FAN XINZHUANG
  • ZHANG CHENG

Assignees

  • 毅富能源科技(广东)有限公司

Dates

Publication Date
20260505
Application Date
20260207

Claims (10)

  1. 1. A method of treating an electrode, the method comprising the steps of: S100, clamping and fixing the carbon felt under the condition of 25-35% compression ratio, and drying to form a preset stress structure; S200, placing the carbon felt in the clamping compression state in the step S100 into a tube furnace for gradient heating heat treatment, and simultaneously controlling the air flow rate along the flowing direction of the electrolyte in the tube furnace to ensure that the air flow rate corresponding to the area at the inlet side of the electrolyte is 1.8-2.2 times of the air flow rate corresponding to the area at the outlet side of the electrolyte; and S300, introducing saturated steam under the continuous clamping compression state, treating for 2.0-2.5 hours at the temperature of 135-145 ℃, then gradient drying to room temperature, and then cooling to the room temperature.
  2. 2. The method of treating an electrode according to claim 1, wherein in the step S100, the drying temperature is 80.+ -. 5 ℃ and the drying time is 2.+ -. 0.3 hours.
  3. 3. The method for treating an electrode according to claim 1, wherein in the step S200, the gradient heat-up treatment is performed by raising the temperature to 150 ℃ at a rate of 2.5.+ -. 0.3 ℃ per minute, then raising the temperature from 150 ℃ to 250 ℃ at a rate of 1.2.+ -. 0.2 ℃ per minute, then raising the temperature from 250 ℃ to 300 ℃ at a rate of 1.0.+ -. 0.1 ℃ per minute, and maintaining the temperature at 300 ℃ for 25.+ -. 2 minutes.
  4. 4. The method according to claim 1, wherein in step S200, the air flow rate of the inlet side region is 90-110ml/min, and the air flow rate of the outlet side region is 45-55ml/min.
  5. 5. The method for treating an electrode according to claim 1, wherein in the step S300, the heat-insulating treatment is performed in a closed pressure vessel at a pressure of 0.6 to 1.0MPa, and after the heat-insulating treatment is completed, the temperature is cooled to 120 ℃ at a rate of 12 to 15 ℃ per minute, cooled to 80 ℃ at a rate of 8 to 10 ℃ per minute, cooled to 60 ℃ at a rate of 5 to 7 ℃ per minute, and naturally cooled to room temperature.
  6. 6. The method for treating an electrode according to claim 1, wherein in step S100, the clamping and fixing are performed in a gradient pressure distribution manner, wherein the pressure distribution along the length direction of the carbon felt is that the pressure of an inlet side area is 0.25-0.35MPa, the pressure of an intermediate area is 0.30-0.40MPa, and the pressure of an outlet side area is 0.35-0.45MPa, so that a preset stress gradient field which is cooperated with the subsequent thermal oxidation is formed.
  7. 7. The electrode processing method according to claim 1, wherein in step S200, gas flow rate monitoring and adjusting devices are provided at both ends of the tube furnace, gas flow rates at the inlet side and the outlet side are monitored in real time, and when a deviation of the flow rate ratio from a range of 1.8-2.2:1 is detected, the outputs of the two mass flow controllers are automatically adjusted to maintain the flow rate ratio stable.
  8. 8. The method for treating an electrode according to claim 1, wherein the carbon felt is a polyacrylonitrile-based carbon felt, has a thickness of 5.+ -. 0.5mm, and has a density of 0.12.+ -. 0.02g/cm3.
  9. 9. A flow battery electrode, characterized in that the electrode is made by the treatment method of any one of claims 1-8.
  10. 10. Use of the electrode treatment method according to any one of claims 1-5 in a flow battery.

Description

Flow battery electrode and application and treatment method thereof Technical Field The invention relates to the technical field of flow batteries, in particular to an electrode, and an application and a treatment method thereof. Background The flow battery has wide application prospect in the field of large-scale energy storage due to long cycle life, high safety and flexible power energy configuration. As a cell core component, the performance of the electrode material directly determines the energy conversion efficiency, power density and long-term stability of the cell. At present, a commercialized flow battery generally adopts a polyacrylonitrile-based carbon felt as an electrode substrate material, but unmodified carbon felt has the inherent defects of insufficient surface catalytic activity, single pore structure, low mass transfer efficiency and the like, and is difficult to meet the high current density operation requirement. In order to improve the electrode performance, the prior art mainly relies on strategies such as chemical oxidation treatment, catalytic material loading or surface functionalization modification. These methods generally involve a variety of strong oxidants, metal salts or organic solvents, not only are complex process flows and high production costs, but also produce a large amount of harmful waste liquid and have significant environmental protection pressure. And the traditional treatment method often causes excessive oxidation or structural damage of the electrode surface, and the performance of the electrode is rapidly attenuated in the long-term charge-discharge cycle process. Meanwhile, the uniform pore structure cannot be matched with the concentration gradient change of the electrolyte in the flowing process, so that the reactivity and the mass transfer efficiency are difficult to cooperatively optimize. Disclosure of Invention The invention mainly aims to provide an electrode, an application and a treatment method thereof, and aims to improve the energy efficiency and the cycle stability of a flow battery electrode. In order to achieve the above object, the present invention provides a method for treating an electrode, the method comprising the steps of: S100, clamping and fixing the carbon felt under the condition of 25-35% compression ratio, and drying to form a preset stress structure; S200, placing the carbon felt subjected to stress presetting in a tube furnace for gradient heating heat treatment, and simultaneously controlling the air flow rate along the flowing direction of the electrolyte in the tube furnace to enable the air flow rate corresponding to the area at the inlet side of the electrolyte to be 1.8-2.2 times of the air flow rate corresponding to the area at the outlet side of the electrolyte; And S300, introducing saturated steam, treating for 2.0-2.5 hours at 135-145 ℃, then gradient drying to room temperature, and then cooling to room temperature. In some embodiments of the invention, in step S100, the drying temperature is 80±5 ℃ and the drying time is 2±0.3 hours. In some embodiments of the invention, in step S200, the gradient heat-up treatment is performed by heating up to 150℃at a rate of 2.5.+ -. 0.3℃per minute, then heating up from 150℃to 250℃at a rate of 1.2.+ -. 0.2℃per minute, then heating up from 250℃to 300℃at a rate of 1.0.+ -. 0.1℃per minute, and incubating at 300℃for 25.+ -. 2 minutes. In some embodiments of the present invention, in step S200, the air flow rate of the inlet side area is 90-110ml/min, and the air flow rate of the outlet side area is 45-55ml/min. In some embodiments of the invention, in step S300, the heat preservation treatment is performed in a closed pressure vessel with the pressure of 0.6-1.0MPa, after the heat preservation is finished, the temperature is cooled to 120 ℃ at the speed of 12-15 ℃ per minute, then cooled to 80 ℃ at the speed of 8-10 ℃ per minute, finally cooled to 60 ℃ at the speed of 5-7 ℃ per minute, and then naturally cooled to room temperature. In some embodiments of the present invention, in step S100, the clamping and fixing adopts a gradient pressure distribution manner, and the pressure distribution along the length direction of the carbon felt is that the pressure of the inlet side area is 0.25-0.35MPa, the pressure of the middle area is 0.30-0.40MPa, and the pressure of the outlet side area is 0.35-0.45MPa, so as to form a preset stress gradient field which cooperates with the subsequent thermal oxidation. In some embodiments of the present invention, in step S200, gas flow monitoring and adjusting devices are disposed at two ends of the tube furnace, and gas flows at the inlet side and the outlet side are monitored in real time, and when a deviation of the flow rate ratio from a range of 1.8-2.2:1 is detected, the output of the two mass flow controllers is automatically adjusted, so as to maintain the flow rate ratio stable. In some embodiments of the invention, the carbon felt is a polyacr