Failure analysis of aluminum electrolytic capacitors based on electrical and physicochemical characterizations

Because of their temperature sensitivity, investigation of thermal effects on electrolytic aluminum capacitors is required using ageing tests. In general, a reliability assessment methodology for these components is carried out during ageing tests, which reports dimensions and weight characterizations, electrical parameter measurement (capacitance and equivalents series resistance (ESR)) and identification of electrolyte's chemical components. However, this chemical analysis typically focuses on the main solvent and salts, without considering the percentage of the other substructures. In this paper, physical characteristics and capacitance has slightly changed according to test's severity unlike ESR which remained constant. Proton Nuclear Magnetic Resonance (1H NMR) spectroscopy was performed, giving information about electrolyte's composition and percentage of identified substructures based on integral calculation of corresponding peaks in the resulting spectrum. The results show that the percentage of some electrolyte's substructures has outstandingly changed for all aged capacitors compared to unaged electrolyte, but not necessarily in the same way. The interpretation of the chemical variation and its influence on physical and electrical characteristics are presented, describing the relationship between mechanisms and modes of failures.

[1]  N. Patin,et al.  A methodology for studying aluminum electrolytic capacitors wear-out in automotive cases , 2013, 2013 15th European Conference on Power Electronics and Applications (EPE).

[2]  Bhanu Sood,et al.  Detection and Reliability Risks of Counterfeit Electrolytic Capacitors , 2014, IEEE Transactions on Reliability.

[3]  Qinglong Li,et al.  Aluminum electrolytic capacitors for tablet PC , 2017 .

[4]  D. S. Campbell,et al.  Electrolytic capacitors: their fabrication and the interpretation of their operational behaviour , 1973 .

[5]  Michael L. Gasperi,et al.  Life prediction model for aluminum electrolytic capacitors , 1996, IAS '96. Conference Record of the 1996 IEEE Industry Applications Conference Thirty-First IAS Annual Meeting.

[6]  S. Parler.  Thermal modeling of aluminum electrolytic capacitors , 1999, Conference Record of the 1999 IEEE Industry Applications Conference. Thirty-Forth IAS Annual Meeting (Cat. No.99CH36370).

[7]  Anshul Shrivastava,et al.  Reliability evaluation of liquid and polymer aluminum electrolytic capacitors , 2014 .

[8]  J. Albella,et al.  Pressure build-up in aluminium electrolytic capacitors under stressed voltage conditions , 1986 .

[9]  J. L. Stevens,et al.  The service life of large aluminum electrolytic capacitors: effects of construction and application , 2001, Conference Record of the 2001 IEEE Industry Applications Conference. 36th IAS Annual Meeting (Cat. No.01CH37248).

[10]  Jeng‐Kuei Chang,et al.  Material characteristics and capacitive properties of aluminum anodic oxides formed in various electrolytes , 2004 .

[11]  Ick-Jun Kim,et al.  Simulation study on the lifetime of electrochemical capacitors using the accelerated degradation test under temperature and voltage stresses , 2015, Microelectron. Reliab..