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Mapping oscillating magnetic fields around rechargeable batteries
Publikationstyp
Journal Article
Date Issued
2020-10
Sprache
English
TORE-URI
Journal
Volume
319
Article Number
106811
Citation
Journal of Magnetic Resonance (319): 106811 (2020-10)
Publisher DOI
Scopus ID
PubMed ID
32920429
Power storage devices such as batteries are a crucial part of modern technology. The development and use of batteries has accelerated in the past decades, yet there are only a few techniques that allow gathering vital information from battery cells in a nonivasive fashion. A widely used technique to investigate batteries is electrical impedance spectroscopy (EIS), which provides information on how the impedance of a cell changes as a function of the frequency of applied alternating currents. Building on recent developments of inside-out MRI (ioMRI), a technique is presented here which produces spatially-resolved maps of the oscillating magnetic fields originating from the alternating electrical currents distributed within a cell. The technique works by using an MRI pulse sequence synchronized with a gated alternating current applied to the cell terminals. The approach is benchmarked with a current-carrying wire coil, and demonstrated with commercial and prototype lithium-ion cells. Marked changes in the fields are observed for different cell types.
Subjects
Alternating current
Current imaging
Oscillating field
Rechargeable batteries
Triggered acquisition