Showing 21–24 of 100 results

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    Preventing Li Ion Battery Failures From a Manufacturing and Design Perspective

    How can you be proactive and make sure your cell supplier is the right one and you don’t end up with thermal events and field failures? Is it enough to qualify a cell manufacturer according to industry standards? The answer is that the majority of compliance based testing is related to abuse tolerance. However, the vast majority of field failures do not occur under abuse scenarios, but happen under normal operating conditions due to manufacturing flaws or design and system tolerance issues that cause internal shorts. In this webinar, you will learn about common lithium ion battery failure modes and how to be proactive in preventing these.

    This webinar will focus on the following key topics:

    • Gain an understanding of lithium ion battery failure mechanisms and the pathway to thermal events
    • Learn how cell design impacts battery safety and reliability
    • Learn the basic steps in a lithium ion cell manufacturing process, and how the process controls affect safety and reliability
    • Come away with a checklist to qualify your cell manufacturer

    Presenter
    Vidyu Challa – Technical Director at DfR Solutions

    Vidyu Challa is Technical Director at DfR Solutions where she works on battery reliability and safety issues. Dr. Challa helps customers with their battery challenges including design reviews, manufacturing audits and supplier qualification. She obtained a PhD from CALCE Electronic Products and Systems Center at the
    University of Maryland. She has broad based expertise that includes engineering technology start-up experience, product development, R&D, and business development. Dr. Challa has published her work in journals, presented at conferences and written blog articles.

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    Electrochemical Impedance Spectroscopy (EIS) Quality Indicators

    The response of a linear and time invariant system to a sinusoidal stimulus of a given frequency is a sinus wave of the same frequency. The amplitude spectra obtained by the Fourier transform will reveal only one spectral line. In the case of a nonlinear system the amplitude spectra will contain several spectral lines called harmonics. The total harmonic distortion (THD) coefficient for N chosen harmonics can be used as an indicator of the system nonlinearity. In the case of a non-stationary system spectral lines appears in the vicinity of the main harmonic. The non-stationary distortion (NSD) coefficient calculated as the RMS ratio of amplitudes of the near-side frequencies to the amplitude of the fundamental can be used as an indicator for non-stationarity.

    Examples of THD and NSD calculations are given highlighting the quality of low frequency impedance measurements on batteries.

    This webinar will focus on the following key topics:

    • General requirements for good impedance measurements
    • Effects of non-linear systems on EIS measurements
    • Effects of non-stationary systems on EIS measurements
    • THD as an indicator of system non-linearity
    • NSD as an indicator of system non-stationarity

    Presenter
    Dr. Bogdan Petrescu – Senior Scientist at Bio-Logic SAS, France

    Bogdan Petrescu is a senior scientist at Bio-Logic Science Instruments. He received his Ph.D in both fields of electrochemistry and electronics in 2002 from the Polytechnic Institute of Grenoble and the Polytechnic University of Bucharest respectively. He was involved for many years in the development of the Bio-Logic potentiostats and battery cyclers. He has a strong expertise in the field of instrumentation for electrochemistry research and more particularly in the research and development of energy storage devices such as batteries and supercapacitors.

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    Battery EIS Tutorial Course 4/4: Factors Affecting EIS Measurements – How to Check and Correct

    When performing an impedance measurement, it is necessary to ensure that the modulation is low enough such that the behavior of the system is linear. It should also be confirmed that the system does not vary in time, and that its stationary state is reached. Several strategies are given to check and correct these phenomena.

    This webinar will focus on the following key topics:

    • For reliable EIS measurements, it should be checked that the response of the system is linear, time-invariant and stationary
    • Several strategies are presented to perform reliable impedance measurements

    Presenter
    Dr. Nicolas Murer – Product Manager and Applications Engineer at Bio-Logic SAS, France

    Dr. Nicolas Murer is a Product Manager and Applications Engineer at Bio-Logic SAS, France, which designs and manufactures high performance research grade instrumentation and software : potentiostats/galvanostats with built-in Electrochemical Impedance Spectroscopy (EIS), Battery Cyclers, Frequency Response Analyzers for materials analysis, and scanning probe electrochemical workstations. Nicolas received his engineering diploma from Polytechnic Institute of Grenoble in electrochemistry and materials in 2003. He then received his Ph.D. at Université de Bourgogne in 2008. Prior to joining Bio-Logic, he was a post-doctorate at the Ohio State University, Columbus, Ohio (USA).

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    Battery EIS Tutorial Course 3/4: Lower Frequency Impedance Measurements – What Information Can we Get on a Battery?

    In batteries involving intercalation of species, by using the impedance response at lower frequencies, it is possible to extract the diffusion coefficient of the intercalated species and monitor its change during discharge and charge.

    Low frequency impedance can also be used to estimate the capacity of a battery. Several strategies are given to perform reliable measurements.

    This webinar will focus on the following key topics:

    • Impedance data at lower frequencies that can be used to extract diffusion parameters of intercalated species
    • Several possibilities that are available, depending on the type of impedance graph obtained

    Presenter
    Dr. Nicolas Murer – Product Manager and Applications Engineer at Bio-Logic SAS, France

    Dr. Nicolas Murer is a Product Manager and Applications Engineer at Bio-Logic SAS, France, which designs and manufactures high performance research grade instrumentation and software : potentiostats/galvanostats with built-in Electrochemical Impedance Spectroscopy (EIS), Battery Cyclers, Frequency Response Analyzers for materials analysis, and scanning probe electrochemical workstations. Nicolas received his engineering diploma from Polytechnic Institute of Grenoble in electrochemistry and materials in 2003. He then received his Ph.D. at Université de Bourgogne in 2008. Prior to joining Bio-Logic, he was a post-doctorate at the Ohio State University, Columbus, Ohio (USA).

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