Time: October 3rd, 2017, 9:00-10:00 am
Venue: Conference Room on First Floor in No.1 Energy Building
Lecturer: Prof. Dr. habil. Jürgen Garche，CEO of FCBAT Ulm
Abstract:
The total energy of a Li-ion cell amounted to ca. 3,250 kJ/kg. About 1/4 of this energy is related to electrochemical energy (chemical energy convertible into electrical energy via discharge) and 3/4 to thermal energy (chemical energy convertible only into thermal energy at abuse conditions).
The main safety related events are overcharge, external heating, external and internal short circuits, and mechanical deformations of the cell/battery case.
These unpredictable events may leads to a temperature increase and at T>120°C by internal chemical processes (SEI layer breakup, anode-electrolyte reaction) with gas development (internal pressure increase) to cell container rupture at predetermined breaking points. Gas and electrolyte will escape through the rupture holes into the environment and, eventually, inflame by an external ignition source.
A further temperature increase till about 200°C triggers high rate chemical reactions (cathode decomposition with O2 development, O2 reaction with the electrolyte) leading to a very rapid temperature rise (thermal runaway) followed by flames caused by reaching the self-ignition temperature of the electrolyte (~ 450°C) and possibly explosions.
The specific occurrence of most of the above described safety related events, will be discussed in this presentation.
Introduction:
Education
- PhD in Theoretical Electrochemistry, 1970, TU Dresden
- Habilitation in Applied Electrochemistry, 1980, TU Dresden
Academia
- Professsor Electrochemistry, Ulm University, Germany
- Visiting professor at Shandong Univerity,
- Dalian Institute of Chemical Physics,
- Sapienza University Roma (Italy)
Business
1970 - 1990
Senior researcher, university lecturer at TU Dresden
1991 - 2004
Head of the Electrochemical Energy Storage and Energy Conversion Division of the Center for Solar Energy and Hydrogen Research (ZSW – http://www.zsw-bw.de) in Ulm, 2004.
2004 - now
CEO of FCBAT Ulm (Fuel Cell and Battery Consulting – http://www.fcbat.eu)
Publications
- 308 papers, 10 patents, 3 books
- Editor-in-Chief, Encyclopedia Electrochemical Power Sources, ELSEVIER, 5 volumes, 2009
Editorial board member
- Journal of Power Sources
- Fuel Cells - From Fundamentals to Systems
- International Journal of Hydrogen Energy
- Electrochemical Power Sources
Awards
- α-β PbO2 Society Price (1998)
- Award of the German Gas Industry (2000)
- European Fuel Cell-Award “Schoenbein Medal” (2003)
- Fuel Cell Excellence Award (2006)
R&D interests
- Lead-Acid, Li-Ion, Redox-Flow Batteries
- PEMFC and DMFCs
- Supercaps
- Photoelectrochemistry
Contact: DONG Yan
Phone: 84379797