Speaker: Prof Rachid Yazami
Affiliation: Nanyang Technological University / KVI PTE LTD
Host: Prof Antonio Castro Neto
Location: Click HERE for directions
Abstract Details: 2D materials are widely used as anode and cathode materials in lithium ion batteries. Graphite and lithiated metal oxides (LMO) of lamellar structure are the choice material for anode and cathode application, respectively.
Thermodynamics data, such as entropy and enthalpy can be measured owing to temperature dependence of open-circuit voltages (OCV) in lithium half-cells using the Equations:
, where n=number of electrons per mole of Li, n=1; F=Faraday constant and E^0=OCV.
We found entropy and enthalpy profiles strongly depend on the crystal structure of graphitizing 2D carbonaceous materials heat treated at different temperatures and of the amounts of cation defects present in LMO materials, such as cation mixing. According, thermodynamics measurements can be used as materials characterization tools complementarily to other methods such as XRD and physical spectrometry (EELS, XAS, ….).
In this presentation we will discuss on the origin of entropy and enthalpy in 2D materials according to the crystal structure disorder, which affect their electrode performances.
About the Speaker: Prof. Rachid Yazami, is a native of Fez, Morocco and a graduate of the Grenoble Institute of Technology (INPG) electrochemistry and materials science where he also received a Ph.D. on graphite intercalation compounds for lithium battery application, and began his career and rose to research director at CNRS (Centre National de la Recherche Scientifique) in Grenoble, France.
Yazami is the inventor involved in more than 140 patents related to battery technology, including on state of charge, state of health and state of safety of batteries together with ultra-fast charge technologies. He also invented the graphite anode in 1979 currently used in most commercial lithium-ion batteries, an over $30B/year business. Dr. Yazami co-authored over 250 articles including peers reviewed papers, and book chapters on batteries and battery materials and systems.
A founder in 2007 of CFX battery, Inc., (Contour Energy Systems) a primary and rechargeable lithium and fluoride battery start-up company in Azusa, California, Yazami has also been a visiting associate in Materials Science and in Chemistry at Caltech (Pasadena, California) in collaboration with JPL/NASA for 10 years. He served the President position of the International Battery Association (IBA) and as International Scientific Board member of several lithium battery conferences and events.
In 2010, Dr. Yazami joined the Nanyang Technological University in Singapore (NTU) where he held the Nanyang Visiting Professor in Materials Science position. Until 2018, he served as the Director of the Energy Storage programs with the Energy Research Institute (ERI@N). Current research areas cover lithium batteries and “Beyond Lithium” future battery technologies, including liquid anode alkali metal-air and fluoride ion batteries. He is also was a PI of battery research at the TUM Create Center of e-mobility, jointly managed by NTU and the Technological University of Munich.
In 2011, Yazami founded KVI PTE LTD a start-up company in Singapore dedicated to battery life and safety enhancement for mobile electronics, large energy storage and electric vehicles applications. KVI is a licensee of Caltech, CNRS and NTU patents invented by Yazami and his team on battery thermodynamics. The technology is currently endorsed by major mobile electronics, EV and battery manufacturers and R&D Centers. Applications include accurate assessments of state of charge, state of health and state of safety and ultrafast battery charging systems.
In recognition of his pioneer work on the graphite anode in lithium ion batteries, Yazami received several scientific awards, including from NASA, NATO, IBA, Japan Society for the Promotion of Science Fellowship, the Hawaii Battery, the IEEE, the Draper Prize of the US National Academy of Engineering. He was a finalist of the Global Energy Award (Russia) and of the Marius Lavet Prize (France).
In 2014 Yazami was decorated by HM the King of Morocco and is the recipient of the French Legion of Honor in 2016. Recently he received the “2018’ Takreem Award” in Science and Technology Innovation, considered the Arab Scientist of the Year Award.