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IEEE Magnetics Talk: The Innate Magnetic Fields of Lithium-Ion Batteries
IEEE Magnetics Talk: The Innate Magnetic Fields of Lithium-Ion Batteries
The Innate Magnetic Fields of Lithium-Ion Batteries Joshua R. Biller April 9th, 2025 Abstract: Lithium-ion batteries (LiB) are ubiquitous and drive a wide variety of devices from personal electronics to electric vehicles. Development of LiB has traditionally been driven by electrochemists and has focused heavily on optimizing charge density per cell. An unintentional end result is a handful of predominant cathode chemistries – LiFePO4 (LFP), LiCoO2 (LCO), LiNiAlCoO2 (NCA), or LiMn2O4 (LMO) – many of which can also be considered as dilute magnetic semiconductors. The magnetic nature of separate LiB components (i.e. anode, cathode, electrolyte, etc.) has been most studied using SQUID magnetometry. Nuclear magnetic resonance (NMR) and electron paramagnetic resonance (EPR) are increasingly used as well. Within the last six years, in vitro magnetometry has shown an innate magnetic field persists for LiB. Initial work centered on special non-magnetic pouch cell geometries. Recently we’ve shown that this magnetic field persists even for larger cylindrical formats like the 18650 and 21700. In addition, changes in the innate magnetic field of LiB can be correlated with changes in the state of health of the battery. A question immediately arises – “How is this signal here to measure?”. In this talk, two different answers to that question will be discussed. The first answer is technical in nature and revolves around a wide variety of magnetometer types (OPM, AMR, TMR) which have been used to capture the magnetic field signal, and the nature of the anisotropic magnetic field emanating from a LiB cell. The second answer is less well developed, and revolves around how ferromagnetic, ferrimagnetic, and super-exchange interactions may possibly combine from the atomic to device scale to present the measured innate magnetic field. Much is unknown - but the importance of LiB in everyday life drives the need for increased understanding of magnetics to augment the existing knowledge of electrochemistry in the rational application, re-use and recycling of LiB. Co-sponsored by: NIST Magnetic Imaging Group Speaker(s): , Josh Agenda: Talk: 11:00AM to 12:pm IEEE Lunch Taj 12:15pm to 1:15pm Room: 1A116, Bldg: 81, 325 Broadway, Boulder, Colorado, United States, 80305, Virtual: https://events.vtools.ieee.org/m/477103