Electrode for flow energy storage battery

A flow energy storage battery and electrode technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of unsuitable electrode materials for all-vanadium flow batteries, poor mechanical strength, poor electrical conductivity, etc., and achieve high practical value and cost. Inexpensive, improved hydrophilicity

Inactive Publication Date: 2012-06-06
DALIAN RONGKE POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because this carbon material exists in the form of powder, it is poor in mechanical strength and electrical conductivity compared to carbon materials with three-dimensional structures such as carbon felt and graphite felt, and is not suitable for use in all-vanadium liquids. Electrode materials for flow batteries

Method used

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  • Electrode for flow energy storage battery
  • Electrode for flow energy storage battery
  • Electrode for flow energy storage battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Put a certain size of carbon felt into the middle of the quartz tube, and then insert it into the tube furnace so that the carbon felt is located in the middle of the tube furnace. Under the protection of a nitrogen atmosphere, the temperature of the tube furnace was raised to 700°C at a heating rate of 10°C / min, and then ammonia gas was introduced to replace the nitrogen gas. Cool to room temperature.

[0037] The morphology of the prepared nitrogen-doped carbon felt is as follows: figure 1 shown. By comparing with the untreated carbon felt, it can be found that there are some small amorphous carbon particles on the surface of the carbon fiber of the untreated carbon felt, and several grooves are distributed; while the surface of the nitrogen-doped carbon felt is cleaner than the untreated carbon felt, and there is no amorphous carbon. Small particles exist, which is caused by the etching effect of ammonia gas, and the grooves are obviously increased, which increases...

Embodiment 2

[0043] Put a certain size of carbon felt into the middle of the quartz tube, and then insert it into the tube furnace so that the carbon felt is located in the middle of the tube furnace. Under the protection of a nitrogen atmosphere, the temperature of the tube furnace was raised to 900°C at a heating rate of 10°C / min, and then ammonia gas was introduced to replace the nitrogen gas. Cool to room temperature.

[0044] The cyclic voltammetry curve of the nitrogen-doped carbon felt prepared in this embodiment is as follows Figure 5 As shown, from the electrochemical oxidation and reduction peak positions and peak currents of V(Ⅱ) / V(Ⅲ) and V(Ⅳ) / V(Ⅴ) in the figure, it can be known that V(Ⅱ) / V(Ⅲ) and V(Ⅲ) The electrochemical activity and electrochemical reversibility of (Ⅳ) / V(Ⅴ) couple on nitrogen-doped carbon felt were significantly improved.

Embodiment 3

[0046] Weigh 200mg of melamine and place it in the reactor, and place the carbon felt in the middle of the tube furnace. First raise the temperature of the tube furnace to 800°C at a rate of 10°C / min under a nitrogen atmosphere, and then rapidly heat the reactor to 300°C. At this time, the sublimated melamine will flow through the carbon felt together with nitrogen, and the constant temperature reaction is 0.5 After h, it was lowered to room temperature under a nitrogen atmosphere.

[0047] The cyclic voltammetry curve of the nitrogen-doped carbon felt prepared in this embodiment is as follows Figure 6 As shown, from the electrochemical oxidation and reduction peak positions and peak currents of V(Ⅱ) / V(Ⅲ) and V(Ⅳ) / V(Ⅴ) in the figure, it can be known that V(Ⅱ) / V(Ⅲ) and V(Ⅲ) The electrochemical activity and electrochemical reversibility of (Ⅳ) / V(Ⅴ) couple on nitrogen-doped carbon felt were significantly improved.

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Abstract

The invention relates to an electrode for a flow energy storage battery. The electrode is prepared by carrying out surface nitrogen mixing and modification on a carbon material, the number of nitrogen atoms of the electrode surface accounts for 2-10 % of the total number of surface atoms, the existing forms of the surface nitrogen contain pyridinic nitrogen, wherein the number of the pyridinic nitrogen atoms accounts for 30-80 % of the total number of surface atoms. According to the invention, lone pair electrons of the pyridinic nitrogen increase the electron density of a graphite layer, thus the electrocatalytic activity of the carbon material is increased; in addition, the introduction of surface nitrogen-containing function groups improves the hydrophilicity of carbon electrode materials; and by doping nitrogen atoms, the conductivity of the electrode material is increased, thus the voltage efficiency and energy efficiency of the flow energy storage battery containing the electrode material are increased. Simultaneously the preparation method is simple and practicable, has no special requirements of devices, has the advantages of convenient operation, low cost, and high practical value, and is easy for batch production.

Description

technical field [0001] The invention relates to an electrode material, in particular to an electrode material for a liquid flow energy storage battery. Background technique [0002] Due to its advantages of independent output power and capacity, flexible system design, high energy efficiency, long life, and high reliability, liquid flow energy storage batteries have broad development prospects in large-scale energy storage, and are considered to be the solution to solar energy, wind energy, etc. Efficient methods for the stochastic and intermittent unsteady characteristics of renewable energy generation systems have great demand in renewable energy generation and smart grid construction. [0003] As one of the key components of all-vanadium redox flow energy storage battery, the electrode is the place for the charge and discharge reactions of the chemical energy storage system. It is required to have excellent oxidation resistance, electrical conductivity, electrocatalytic p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/86H01M4/88
CPCY02E60/50
Inventor 张华民刘涛刘宗浩井然张立群姚川
Owner DALIAN RONGKE POWER
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