Author(s)

Davis George Moye^1*, Pedro L. Moss², Xujie Chen^#, Wanjun Cao^#, Simon Foo³

¹Moye Consultants, 527 E. Park Ave, Tallahassee, FL, USA.
²Greencastle Sustainable Electrical Energy Systems, Tallahassee, FL, USA.
³Department of Electrical and Computer Engineering, Florida A&M University and Florida State University, Tallahassee, FL, USA.

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.

Arrhenius Equation, Cycle Life, Cycle Life Degradation, Lithium-Ion Capacitor, Butler-Volmer Equation, Activation Energy

Moye, D. , Moss, P. , Chen, X. , Cao, W. and Foo, S. (2020) Observations on Arrhenius Degradation of Lithium-Ion Capacitors. Materials Sciences and Applications, 11, 450-461. doi: 10.4236/msa.2020.117031.