SEI Growth Impacts of Lamination, Formation and Cycling in Lithium Ion Batteries

The accumulation of solid electrolyte interphases (SEI) in graphite anodes related to elevated formation rates (0.1C, 1C and 2C), cycling rates (1C and 2C), and electrode-separator lamination is investigated. As shown previously, the lamination technique is beneficial for the capacity aging in graph...

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Published inBatteries (Basel) Vol. 6; no. 2; p. 21
Main Authors Frankenberger, Martin, Trunk, Markus, Seidlmayer, Stefan, Dinter, Alexander, Dittloff, Johannes, Werner, Lukas, Gernhäuser, Roman, Revay, Zsolt, Märkisch, Bastian, Gilles, Ralph, Pettinger, Karl-Heinz
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.06.2020
Subjects
Aging
Anodes
Cycles
Decomposition
Depth profiling
Electrochemical impedance spectroscopy
Electrodes
Electrolytes
Electrolytic cells
formation
Graphite
lamination
lifetime
Lithium
Lithium-ion batteries
lithium-ion battery
Neutron depth profiling
Rechargeable batteries
Separators
Solid electrolytes
solid-electrolyte-interphase
Surface resistance
Trends
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Summary:The accumulation of solid electrolyte interphases (SEI) in graphite anodes related to elevated formation rates (0.1C, 1C and 2C), cycling rates (1C and 2C), and electrode-separator lamination is investigated. As shown previously, the lamination technique is beneficial for the capacity aging in graphite-LiNi1/3Mn1/3Co1/3O2 cells. Here, surface resistance growth phenomena are quantified using electrochemical impedance spectroscopy (EIS). The graphite anodes were extracted from the graphite NMC cells in their fully discharged state and irreversible accumulations of lithium in the SEI are revealed using neutron depth profiling (NDP). In this post-mortem study, NDP reveals uniform lithium accumulations as a function of depth with lithium situated at the surface of the graphite particles thus forming the SEI. The SEI was found to grow logarithmically with cycle number starting with the main formation in the initial cycles. Furthermore, the EIS measurements indicate that benefits from lamination arise from surface resistance growth phenomena aside from SEI growth in superior anode fractions.
ISSN:2313-0105
2313-0105
DOI:10.3390/batteries6020021