Date: December 13, 2019 ǀ 14:00-15:00
Location: Auditorium, TUM Institute for Advanced Study, Lichtenbergstrasse 2 a, 85748 Garching, Tel +49.89.289.10550
Organization: TUM-IAS and Rudolf Diesel Industry Fellow Dr. Filippo Maglia (BMW Group)
Admission is free. No registration required.
Title: From atomistic models to high-precision charge counting: reading tales told at tabs and how to convert them into pounds.
Speaker: Prof. Harry Hoster, Lancaster University.
Harry Hoster is the Director of Energy Lancaster, a research centre that brings together all energy-related research at Lancaster University. He is a Professor of Physical Chemistry with strong engagement in electrochemical energy storage and related research projects. He is also Technical Director of the data company Altelium Ltd.. He started his career studying Physics in Bonn, obtained a PhD in Electrochemistry in Munich, and received a Habilitation in Physical Chemistry in Ulm. From 2003 until 2010, he led the group “Nanostructured Metal Surfaces” at the Institute of Surface Chemistry and Catalysis in Ulm. In 2010, he became Associate Professor at Technical University of Munich and led the research programme TUM CREATE in Singapore as Scientific Director and Principal Investigator. Having once started at the atomic scale fundamentals in electrochemical energy conversion, his interests and funded activities have since then scaled up to include clean transport, hydrogen-based energy storage, and the role of battery data at the London insurance market.
Abstract:
Voltage profiles and entropy profiles are measured at the tabs of Lithium Ion Batteries over varying states of charge. Those profiles carry thermodynamic information about the electrodes and changes in those profiles over time allow deeper insights into the mechanisms behind battery degradation.
I will demonstrate how voltage and entropy profiles are modelled on an atomistic scale and how those findings relate to experimental observations. In particular, I will highlight some of our recent insights into the temperature-dependent charge/discharge behaviour of the supposedly well-understood graphite electrode.
Technically / commercially relevant degradation processes in batteries manifest themselves in lower coulombic efficiencies. Hence, high-precision charge counting has been proposed as a promising tool for battery quality control and lifetime predictions. Since it enables tracking state-of-charge on an absolute scale, it also provides insights into anode and cathode dominated capacity fading.
Insufficient battery cycle and calendar life prohibit market entry of yet-to-be-seen electric vehicles. Whilst waiting for better batteries, an unexpected saviour may appear: Lloyd’s of London.