Статья

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

Martin FrankenbergerTechnology Center for Energy, University of Applied Sciences Landshut, 94099 Ruhstorf, GermanyMarkus TrunkHeinz Maier-Leibnitz Zentrum, Technical University of Munich, 85748 Garching, GermanyStefan SeidlmayerHeinz Maier-Leibnitz Zentrum, Technical University of Munich, 85748 Garching, GermanyAlexander DinterTechnology Center for Energy, University of Applied Sciences Landshut, 94099 Ruhstorf, GermanyJohannes DittloffPhysics Department, Technical University of Munich, 85748 Garching, GermanyLukas WernerPhysics Department, Technical University of Munich, 85748 Garching, GermanyR. GernhäuserPhysics Department, Technical University of Munich, 85748 Garching, GermanyZsolt RévayHeinz Maier-Leibnitz Zentrum, Technical University of Munich, 85748 Garching, GermanyBastian MärkischPhysics Department, Technical University of Munich, 85748 Garching, GermanyRalph GillesHeinz Maier-Leibnitz Zentrum, Technical University of Munich, 85748 Garching, GermanyKarl‐Heinz PettingerTechnology Center for Energy, University of Applied Sciences Landshut, 94099 Ruhstorf, Germany

2020en

ABI

Аннотация

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.

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Идентификаторы

DOI: 10.3390/batteries6020021

Цитирования и источники

Цитирований: 2Использованных источников: 0

Показатели — AkademScholar