Study of the H2O/Al2O3 Interface and the Acting Mechanism of Water in the Working Electrolyte

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Abstract

Using a working electrolyte containing mixed solvents of ethylene glycol and N,N-dimethylformamide, this paper presents a study of the reactions on the H2O/Al2O3 interface with sum frequency vibrational spectroscopy and the effects of different water content on the performance of the working electrolyte and an aluminum electrolytic capacitor and summarizes the rules of the variations in the performance parameters of the working electrolyte and aluminum electrolytic capacitor with respect to the water content. The results demonstrate that, when the water content is increased from 2.5 to 15%, the conductivity of the working electrolyte increased by 930 μS/cm, and the sparking voltage decreased by 27 V. Also, the increased water content causes lower oxidation efficiency and lower thermal stability. The leakage current of the aluminum electrolytic capacitor after high-temperature storage increases with an increase in the water content, and the attenuation rate of capacitor’s the low-temperature capacitance decreases with an increase in the water content.

Keywords

Working electrolyte Aluminum electrolytic capacitor Water content Sum-frequency vibrational spectroscopy (SFVS) 

Notes

Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant No. 51774343); the Special Foundation of Industrial Upgrading Transformatio and Strengthen the Foundation of Ministry of Industry and Information Technology, China (Grant No. 0714-EMTC02-5271/6); and the Foundation of Strategic Emerging Industrial Scientific Project Research, China (Grant No. 2015GK1045).

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Copyright information

© The Korean Institute of Metals and Materials 2018

Authors and Affiliations

  1. 1.School of Metallurgy and EnvironmentCentral South UniversityChangsha CityChina
  2. 2.The Aihua GroupYiyang CityChina
  3. 3.All-Solid-State Energy Storage Materials and DevicesYiyang CityChina

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