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SUMMARY:Chemical Engineering Seminar - Generation and evolution of materia
 ls in the anode Solid Electrolyte Interphase (SEI) of lithium ion batterie
 s
DTSTART:20190213T150000
DTEND:20190213T160000
DTSTAMP:20260511T031026Z
UID:9121f498ddc5ef9fb4121f5e96af53646d0c98e93eb0ee2009bf7144
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Brett Lucht\, Department of Chemistry\, University of Rh
 ode Island\, USA \nA solid electrolyte interphase (SEI) is generated on t
 he anode of lithium ion batteries during the first few charging cycles.  
 The presence and stability of the SEI is critical to the performance of th
 e battery. However\, despite thorough investigation of the SEI for 40 year
 s\, the SEI remains poorly understood.  Over the last decade additional i
 nvestigations of the structure of the initial SEI formed on graphite\, sil
 icon and lithium metal electrodes along with changes which occur to the SE
 I upon additional cycling have been conducted.  The investigations provid
 e significant new insight into the structure and evolution of the anode SE
 I. The SEI formation reactions have been complemented by investigations ut
 ilizing the one electron reducing agent\, lithium napthalenide\, to indepe
 ndently prepare and investigated the reduction products which constitute t
 he SEI. The initial reduction products of ethylene carbonate (EC) are lith
 ium ethylene dicarbonate (LEDC) and ethylene.  However\, the instability 
 of LEDC and related lithium alkyl carbonates generates an intricate mixtur
 e of compounds which greatly complicates the composition of the SEI.  The
  reduction products and their subsequent decomposition products have been 
 thoroughly investigated via a combination of NMR\, XPS\, IR-ATR\, TGA\, an
 d GC-MS.  Mechanisms for the generation of the complicated mixture of pro
 ducts will be discussed along with the differences in the SEI structure an
 d function for different anodes including graphite\, silicon and lithium m
 etal. \n 
LOCATION:BCH 2201 https://plan.epfl.ch/?room==BCH%202201
STATUS:CONFIRMED
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