The Innate Magnetic Fields of Lithium-Ion BatteriesJoshua R. BillerApril 9th, 2025Abstract: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 <a href="http://LiB.Co-sponsored" target="_blank" title="LiB.Co-sponsored">LiB.Co-sponsored by: NIST Magnetic Imaging GroupSpeaker(s): , Josh Agenda: Talk: 11:00AM to 12:pmIEEE Lunch Taj 12:15pm to 1:15pmRoom: 1A116, Bldg: 81, 325 Broadway, Boulder, Colorado, United States, 80305, Virtual: https://events.vtools.ieee.org/m/477103

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

Speaker(s): Eli Cox Agenda: 6:25to 6:35 PM - Open for participants to enter and network. 6:35 to 6:40 PM - IEEE LM and CTCN Business meeting and to introduce speaker. 6:40 to 7:55PM - Formal Program and Q&A. Room: 8, Bldg: Asian American Resource Center, 8401 Cameron Rd., Austin, Texas, United States, 78754, Virtual: https://events.vtools.ieee.org/m/477911

Come join us for this Dine and Learn event hosted by the Denver Section and University of Colorado Boulder. You're invited to participate in an exciting and engaging presentation titled "From Wafers to Cutting-Edge Products: The process of Testing, Packaging, and Design" by Tim Swettlen. Whether you're a college student eager to expand your knowledge or a technical professional looking to stay informed in this evolving industry, this presentation aims to cover the key test and assembly stages that deliver functional products to market. * Food and beverage will be provided. * Parking code will be provided to event registrants. Abstract: As Moore’s Law slows down on transistor density at the die level, advanced packaging methods are bridging the gap and continue to deliver ever more powerful products. To understand these changes, a thorough understanding of the testing flow is important as more die are stacked on a single final product. This talk starts as the wafer exits the fab, is exposed to a battery of tests and routed to its highest value package and product. Each die on the wafer is processed on the same test flow but its testing results will direct it to different bins sold at different selling prices. These complex test flows allow the right parts to be assembled into the best final product whether it’s an advanced smart phone or an entry level AI accelerator card. Co-sponsored by: University of Colorado Boulder Speaker(s): Tim Swettlen, Agenda: Agenda: 6:00- 6:30PM Food and networking 6:30-7:30 PM Presentation 7:30- 8:00 PM Q&A Discussion 8:00 PM Adjourn Room: 1B70, Bldg: Discovery Learning Center (DLC), University of Colorado Boulder, 1095 Regent Drive, Boulder, Colorado, United States, 80309, Virtual: https://events.vtools.ieee.org/m/476572

Come join us for this Dine and Learn event hosted by the Denver Section and University of Colorado Boulder. You're invited to participate in an exciting and engaging presentation titled "From Wafers to Cutting-Edge Products: The process of Testing, Packaging, and Design" by Tim <a href="http://Swettlen.Whether" target="_blank" title="Swettlen.Whether">Swettlen.Whether you're a college student eager to expand your knowledge or a technical professional looking to stay informed in this evolving industry, this presentation aims to cover the key test and assembly stages that deliver functional products to <a href="http://market.*" target="_blank" title="market.*">market.* Food and beverage will be <a href="http://provided.*" target="_blank" title="provided.*">provided.* Parking code will be provided to event <a href="http://registrants.Abstract:As" target="_blank" title="registrants.Abstract:As">registrants.Abstract:As Moore’s Law slows down on transistor density at the die level, advanced packaging methods are bridging the gap and continue to deliver ever more powerful products. To understand these changes, a thorough understanding of the testing flow is important as more die are stacked on a single final <a href="http://product.This" target="_blank" title="product.This">product.This talk starts as the wafer exits the fab, is exposed to a battery of tests and routed to its highest value package and product. Each die on the wafer is processed on the same test flow but its testing results will direct it to different bins sold at different selling prices. These complex test flows allow the right parts to be assembled into the best final product whether it’s an advanced smart phone or an entry level AI accelerator <a href="http://card.Co-sponsored" target="_blank" title="card.Co-sponsored">card.Co-sponsored by: University of Colorado BoulderSpeaker(s): Tim Swettlen, Agenda: Agenda:6:00- 6:30PM Food and networking6:30-7:30 PMPresentation7:30- 8:00 PM Q&A Discussion8:00 PM AdjournRoom: 1B70, Bldg: Discovery Learning Center (DLC), University of Colorado Boulder, 1111 Engineering Drive, Boulder, Colorado, United States, 80309, Virtual: https://events.vtools.ieee.org/m/476572

Meeting for general administration and operation of the Black Hills <a href="http://Subsection.Virtual:" target="_blank" title="Subsection.Virtual:">Subsection.Virtual: https://events.vtools.ieee.org/m/477603