BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Memento EPFL//
BEGIN:VEVENT
SUMMARY:IMX Seminar Series - Modelling failure of all solid-state Li-ion b
 atteries
DTSTART:20220314T131500
DTEND:20220314T141500
DTSTAMP:20260427T210542Z
UID:c0a97b081000b1c5e46a16a2e258e874424ff3fd8292aa66918ea671
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Vikram Deshpande\, University of Cambridge\, UK\nSolid-s
 tate batteries comprising a ceramic electrolyte and Li metal anode have th
 e potential to deliver enhanced safety along with higher specific energies
  compared to liquid electrolyte Li-ion batteries. However\, stiff\, and st
 rong ceramic electrolytes can suffer short circuits resulting from the pen
 etration of Li filaments through the ceramic at charging currents above a 
 critical current density. This is remarkable since the yield strength of L
 i is on the order of a few MPa while the ceramic electrolytes have strengt
 hs of many 100s of MPa and moduli in the GPa range. The failure of these L
 i-ion cells occurs via two interconnected processes: (i) formation of void
 s at the Li electrode/electrolyte interface and (ii) growth of Li filament
 s\, that emanate from vicinity of these voids\, into the electrolyte. We s
 hall present coupled electrochemical-mechanical variational principles to 
 understand how the electrochemistry of these cells drives mechanical failu
 re. Our focus is on developing an understanding of how well-established id
 eas such as Butler-Volmer kinetics need to be modified in the context of t
 hese solid-state batteries. The numerical solution of the variational prin
 ciples provides insights into experimental observations\, but numerous unc
 ertainties remain with regards the microscale properties of the Li and sol
 id electrolytes as well the mechanisms coupling mechanical deformations an
 d electrochemistry.\n\nTwo relevant references\nI am providing one experim
 ental and one theoretical reference to help students see both sides of one
  aspect of the story I will discuss\, viz. void formation in electrodes. I
  felt it is best I give both papers on this one aspect as at-least student
 s then can see this one problem more clearly.\n\n	S.S. Shishvan\, N.A. Fle
 ck\, and V.S. Deshpande (2021)\, The initiation of void growth during str
 ipping of Li electrodes in solid electrolyte cells\, Journal of Power Sou
 rces\, 488\, 229437.\n	J. Kasemchainan\, S. Zekoll\, D.S. Jolly\, Z. Ning
 \, G.O. Hartley\, J. Marrow\, P.G. Bruce (2021)\, Critical stripping curr
 ent leads to dendrite formation on plating in lithium anode solid electrol
 yte cells\, Nature Materials\, 18 1105-1111.\n\nBio: Prof. Vikram Deshp
 ande joined the faculty of Engineering at the University of Cambridge as a
  lecturer in 2001 and was promoted to a professorship in Materials Enginee
 ring in 2010. He has written in excess of 290 journal articles in experime
 ntal and theoretical solid mechanics. He serves on the editorial boards of
  a number of journals in mechanics and biomechanics including Journal of t
 he Mechanics and Physics of Solids\, Modelling and Simulation in Materials
  Science and Engineering and the Proceedings of the Royal Society\, London
 . He has been awarded numerous medals including the William Hopkins medal
 \, the 2020 Rodney Hill Prize in Solid Mechanics\, the William Prager meda
 l and elected Fellow of the Royal Society\, London.\n\n\n \n\n	 \n\n\n 
LOCATION:https://epfl.zoom.us/j/68532296336?pwd=UXBrN1RBWHVFQjVjSko2NDF3S3
 Awdz09
STATUS:CONFIRMED
END:VEVENT
END:VCALENDAR