Observations on Arrhenius Degradation of Lithium-Ion Capacitors

• 作者: Davis George Moye Pedro L. Moss Simon Foo Wanjun Cao Xujie Chen
• 来源期刊: 材料科学与应用期刊(英文)
• 学科: 数学
• 关键词: Arrhenius Equation Cycle Life Cycle Life Degradation Lithium-Ion Capacitor Butler-Volmer Equation Activation Energy
• 年，卷（期）: clkxyyyqkyw_2020,（7）
• 页码范围: 450-461
• 页数: 12页
• 分类号: O15

摘要

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.