Title :
A Life Model for Supercapacitors
Author :
Williard, Nick ; Dongcheon Baek ; Jong Won Park ; Byung-Oh Choi ; Osterman, Michael ; Pecht, Michael
Author_Institution :
Center for Adv. Life Cycle Eng., College Park, MD, USA
Abstract :
Supercapacitors provide high-power energy storage for electrical systems. The expected useful life of a supercapacitor is related to the oxidation of functional groups on the graphite electrode surface during usage, and it is highly dependent on operational voltage and temperature. In this paper, a life model is developed for commercial supercapacitors. The model incorporates a new voltage multiplier to describe the combined effects of temperature and voltage on supercapacitor life. Accelerated testing was conducted to obtain the time to failure of supercapacitors over a range of voltage and temperature conditions, validate the life model, and compare the model with two previously established capacitor life models. Failure was defined by a 30% decrease in capacitance or a 100% increase in equivalent series resistance.
Keywords :
failure analysis; graphite; life testing; supercapacitors; voltage multipliers; accelerated testing; electrical systems; equivalent series resistance; expected useful life; graphite electrode surface; high-power energy storage; life model; supercapacitor failure; voltage multiplier; Capacitance; Capacitors; Life estimation; Resistance; Stress; Temperature measurement; Testing; Accelerated aging; Lifetime estimation; Materials reliability; Supercapacitors; lifetime estimation; materials reliability; supercapacitors;
Journal_Title :
Device and Materials Reliability, IEEE Transactions on
DOI :
10.1109/TDMR.2015.2479466
