An all-vanadium redox flow battery
An all-vanadium redox flow battery and battery technology, applied in fuel cells, battery electrodes, regenerative fuel cells, etc., can solve the problems of affecting the battery Coulombic efficiency and life, large electrochemical polarization of the battery, and insufficient oxidation resistance, etc. Improve antioxidant capacity, reduce electrochemical polarization, and achieve the effect of commercial production
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Embodiment 1
[0022] The graphite felt produced by German SGL company is used as the positive electrode, the carbon content is 98.4%, the layer spacing of the (002) plane is 0.342nm, and the degree of graphitization is 23.3%; the carbon felt produced by Liaoyang Jingu Carbon Fiber Technology Co., Ltd. is used as the negative electrode. Its carbon content is 94.5%, and the interlayer spacing of (002) plane is 0.348nm.
[0023] Graphite felt and carbon felt with a size of 8cm×6cm×0.5cm were cut out and used as positive and negative electrodes respectively to assemble a single battery for charging and discharging performance tests. The positive electrolyte is 1.5M VO 2+ 3M H 2 SO 4 Solution 60ml, negative electrode electrolyte is 1.5M V 3+ 3M H 2 SO 4 Solution 60ml. Its at 80mA / cm 2 The battery efficiency and the electrolyte utilization rate when charged to 1.65V are shown in Table 1, from which it can be seen that compared with the battery using carbon felt as the positive and negative...
Embodiment 2
[0029] The carbon felt produced by Liaoyang Jingu Carbon Fiber Technology Co., Ltd. was graphitized in a vacuum environment at 2400°C for 1 hour, and used as the positive electrode. The carbon content was 97.6%, the interlayer spacing of the (002) plane was 0.342nm, and the degree of graphitization was 23%. ; The carbon felt produced by Liaoyang Jingu Carbon Fiber Technology Co., Ltd. was used as the negative electrode, the carbon content was 94.5%, and the interlayer spacing of the (002) plane was 0.348nm.
[0030] It can be seen from Table 1 that, compared with the battery using carbon felt as the positive and negative electrodes in Comparative Example 1, the voltage efficiency of the battery of this embodiment is not significantly reduced, and the utilization rate of the electrolyte is increased by 21.9%. Compared with the battery using graphite felt as the positive and negative electrodes in Comparative Example 2, the voltage efficiency, energy efficiency and electrolyte ut...
Embodiment 3
[0032] The carbon felt produced by Liaoyang Jingu Carbon Fiber Technology Co., Ltd. was graphitized at 2800°C for 1 hour in a vacuum environment, and used as the positive electrode. The carbon content was 98.7%, the interlayer spacing of the (002) plane was 0.34nm, and the degree of graphitization was 46.5%. ; The carbon felt produced by Liaoyang Jingu Carbon Fiber Technology Co., Ltd. was used as the negative electrode, the carbon content was 94.5%, and the interlayer spacing of the (002) plane was 0.348nm.
[0033] Table 1 The single cell in each embodiment and the single cell in the comparative example at 80mA / cm 2 battery efficiency and electrolyte utilization
[0034]
[0035] It can be seen from Table 1 that, compared with the battery using carbon felt as the positive and negative electrodes in Comparative Example 1, the voltage efficiency of the battery of this embodiment does not decrease significantly, and the electrolyte utilization rate increases by 20.1%. Compa...
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