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Titanium doping modification method of vanadium battery graphite felt electrode material

A technology of electrode material and graphite felt, which is applied in battery electrodes, fuel cells, regenerative fuel cells, etc., can solve the problems of easy precipitation and blockage of vanadium pentoxide, low catalytic activity, and few active sites, so as to achieve good economy and environmental protection benefit, improved energy efficiency, water absorption and specific surface improvement

Inactive Publication Date: 2020-09-18
朱义奎
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the traditional vanadium battery electrode materials have poor wettability with the electrolyte, and the overpotential is high, resulting in fewer active sites and lower catalytic activity in the vanadium battery during charge and discharge, and vanadium pentoxide in the electrolyte is easy to precipitate and block. Runner and other issues

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The titanium-doped modification method of a vanadium battery graphite felt electrode material described in this embodiment comprises the following steps:

[0029] (1) Cut the polyacrylonitrile-based graphite felt to a size of 5cm×10cm, rinse it once with deionized water, and then soak it in deionized water for ultrasonic cleaning for 15 minutes;

[0030] (2) Take out the polyacrylonitrile-based graphite felt and dry it in an oven at 45°C;

[0031] (3) Prepare butyl titanate solution A with a molar concentration of 0.2 mol / L with deionized water and butyl titanate reagent, and stir evenly;

[0032] (4) Prepare 0.01mol / L NaOH solution B with deionized water and flake NaOH reagent;

[0033] (5) Add NaOH solution B dropwise to butyl titanate solution A, and ultrasonically oscillate while adding, and adjust the pH value to 7.1 to obtain slightly alkaline butyl titanate solution C;

[0034] (6) Immerse the dried polyacrylonitrile-based graphite felt in the solution C, conti...

Embodiment 2

[0037] The titanium-doped modification method of a vanadium battery graphite felt electrode material described in this embodiment comprises the following steps:

[0038] (1) Cut the polyacrylonitrile-based graphite felt to a size of 5cm×10cm, rinse it once with deionized water, and then soak it in deionized water for ultrasonic cleaning for 30 minutes;

[0039] (2) Take out the polyacrylonitrile-based graphite felt and dry it in an oven at 45°C;

[0040] (3) Prepare butyl titanate solution A with a molar concentration of 0.5 mol / L with deionized water and butyl titanate reagent, and stir evenly;

[0041] (4) Prepare 0.01mol / L NaOH solution B with deionized water and flake NaOH reagent;

[0042] (5) Add NaOH solution B dropwise to butyl titanate solution A, and ultrasonically oscillate while adding, and adjust the pH value to 7.5 to obtain slightly alkaline butyl titanate solution C;

[0043] (6) Immerse the dried polyacrylonitrile-based graphite felt in solution C, continue ...

Embodiment 3

[0046] The titanium-doped modification method of a vanadium battery graphite felt electrode material described in this embodiment comprises the following steps:

[0047] (1) Cut the polyacrylonitrile-based graphite felt to a size of 5cm×10cm, rinse it once with deionized water, and then soak it in deionized water for ultrasonic cleaning for 20 minutes;

[0048] (2) Take out the polyacrylonitrile-based graphite felt and dry it in an oven at 45°C;

[0049] (3) Prepare butyl titanate solution A with a molar concentration of 0.3 mol / L with deionized water and butyl titanate reagent, and stir evenly;

[0050] (4) Prepare 0.01mol / L NaOH solution B with deionized water and flake NaOH reagent;

[0051] (5) Add NaOH solution B dropwise to butyl titanate solution A, and ultrasonically oscillate while adding, and adjust the pH value to 7.3 to obtain slightly alkaline butyl titanate solution C;

[0052] (6) Immerse the dried polyacrylonitrile-based graphite felt in solution C, continue ...

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Abstract

The invention provides a titanium doping modification method of a vanadium battery graphite felt electrode material, which belongs to the field of green energy materials. The preparation method comprises the steps of ultrasonically cleaning polyacrylonitrile-based graphite felt with deionized water; and drying in a drying oven, soaking the graphite felt in an alkalescent aqueous solution of butyltitanate, performing ultrasonic oscillation, standing, taking out the graphite felt after gel is formed, calcining in a vacuum furnace, performing air cooling, cleaning with deionized water, and drying to obtain the vanadium battery titanium-doped graphite felt modified electrode material with high hydrophilicity, large specific surface area and high electrochemical activity. After the vanadium battery graphite felt electrode material is subjected to titanium doping modification, the titanium doping amount is 1.3 to 2.8%, the water absorption rate is improved by 325 to 413%, the specific surface area is improved by 43 to 65%, and the energy efficiency is improved to 68 to 81% under the current density of 230 mA / cm <2>.

Description

technical field [0001] The invention relates to a method for titanium doping modification of a graphite felt electrode material for a vanadium battery, and belongs to the field of green energy materials. Background technique [0002] Vanadium battery is a high-efficiency, clean and large-capacity energy source, which meets the goal of "studying high-efficiency energy-saving and solving energy storage problems" proposed by the National Development and Reform Commission. Therefore, the development of vanadium batteries has attracted the attention of various countries and will be Play a more important role in a future where natural resources are increasingly depleted. [0003] However, the traditional vanadium battery electrode materials have poor wettability with the electrolyte, and the overpotential is high, resulting in fewer active sites and lower catalytic activity in the vanadium battery during charge and discharge, and vanadium pentoxide in the electrolyte is easy to pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/88H01M4/96H01M8/18
CPCH01M4/88H01M4/96H01M8/188Y02E60/50
Inventor 朱义奎
Owner 朱义奎
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