Influence of Vinylene Carbonate and Fluoroethylene Carbonate on Open Circuit and Floating SoC Calendar Aging of Lithium-Ion Batteries
Karsten Geuder,
Sebastian Klick,
Philipp Finster,
Karl Martin Graff,
Martin Winter,
Sascha Nowak,
Hans Jürgen Seifert,
Carlos Ziebert
Affiliations
Karsten Geuder
Institute for Applied Materials-Applied Materials Physics, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein, Germany
Sebastian Klick
Chair for Electrochemical Energy Conversion and Storage Systems, Institute for Power Electronics and Electrical Drives (ISEA), RWTH Aachen University, Campus Boulevard, 52074 Aachen, Germany
Philipp Finster
Institute for Applied Materials-Applied Materials Physics, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein, Germany
Karl Martin Graff
Chair for Electrochemical Energy Conversion and Storage Systems, Institute for Power Electronics and Electrical Drives (ISEA), RWTH Aachen University, Campus Boulevard, 52074 Aachen, Germany
Martin Winter
MEET Battery Research Center, University of Münster, Corrensstr. 46, 48149 Münster, Germany
Sascha Nowak
MEET Battery Research Center, University of Münster, Corrensstr. 46, 48149 Münster, Germany
Hans Jürgen Seifert
Institute for Applied Materials-Applied Materials Physics, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein, Germany
Carlos Ziebert
Institute for Applied Materials-Applied Materials Physics, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein, Germany
The purpose of this study was to investigate the calendar aging of lithium-ion batteries by using both open circuit and floating current measurements. Existing degradation studies usually focus on commercial cells. The initial electrolyte composition and formation protocol for these cells is often unknown. This study investigates the role of electrolyte additives, specifically, vinylene carbonate (VC) and fluoroethylene carbonate (FEC), in the aging process of lithium-ion batteries. The results showed that self-discharge plays a significant role in determining the severity of aging for cells without additives. Interestingly, the aging was less severe for the cells without additives as they deviated more from their original storage state of charge. It was also observed that the addition of VC and FEC had an effect on the formation and stability of the solid electrolyte interphase (SEI) layer on the surface of the carbonaceous anode. By gaining a better understanding of the aging processes and the effects of different electrolyte additives, we can improve the safety and durability of lithium-ion batteries, which is critical for their widespread adoption in various applications.
