Electrochemical kinetics of SEI growth on carbon black, I: Experiments
arXiv:1901.01190 · doi:10.1149/2.0231904jes
Abstract
Growth of the solid electrolyte interphase (SEI) is a primary driver of capacity fade in lithium-ion batteries. Despite its importance to this device and intense research interest, the fundamental mechanisms underpinning SEI growth remain unclear. In Part I of this work, we present an electroanalytical method to measure the dependence of SEI growth on potential, current magnitude, and current direction during galvanostatic cycling of carbon black/Li half cells. We find that SEI growth strongly depends on all three parameters; most notably, we find SEI growth rates increase with nominal C rate and are significantly higher on lithiation than on delithiation. We observe this directional effect in both galvanostatic and potentiostatic experiments and discuss hypotheses that could explain this observation. This work identifies a strong coupling between SEI growth and charge storage (e.g., intercalation and capacitance) in carbon negative electrodes.
35 pages, 8 figures
References in corpus (2)
Cited by in corpus (9)
- "Knees" in lithium-ion battery aging trajectories
- Perspective: Challenges and opportunities for high-quality battery production at scale
- Electrochemical kinetics of SEI growth on carbon black, II: Modeling
- Chemo-Mechanical Model of SEI Growth on Silicon Electrode Particles
- Systematic Feature Design for Cycle Life Prediction of Lithium-Ion Batteries During Formation
- A four parameter model for the solid-electrolyte interphase to predict battery aging during operation
- Theory of layered-oxide cathode degradation in Li-ion batteries by oxidation-induced cation disorder
- Microstructure-Resolved Degradation Simulation of Lithium-Ion Batteries in Space Applications
- Population Effects Driving Active Material Degradation in Intercalation Electrodes