TITLE:
Observations on Arrhenius Degradation of Lithium-Ion Capacitors
AUTHORS:
Davis George Moye, Pedro L. Moss, Xujie Chen, Wanjun Cao, Simon Foo
KEYWORDS:
Arrhenius Equation, Cycle Life, Cycle Life Degradation, Lithium-Ion Capacitor, Butler-Volmer Equation, Activation Energy
JOURNAL NAME:
Materials Sciences and Applications,
Vol.11 No.7,
July
17,
2020
ABSTRACT: Earlier research determined that lithium-ion capacitor (LIC) cycle life degradation can be accelerated by elevated temperature. LIC cycle life degradation can be described by an Arrhenius equation. This study performed cycle life testing at a constant temperature but varied cycle current. The results were described by an Arrhenius equation relying upon the number of cycles and a constant, which was determined by cycle current. Using mathematical derivations and experimental results, the researchers quantified the effects of activation energy and temperature upon this constant. Because cell temperature is nearly constant during cycles, it was deduced that elevated cycle current decreases activation energy. This lower activation energy then accelerates degradation. Thus this research demonstrates that cycle current ages LICs through its effects on their activation energies.