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SUMMARY:Generation and evolution of materials in the  anode Solid Electrol
 yte Interphase (SEI) of lithium ion batteries
DTSTART:20190213T150000
DTEND:20190213T160000
DTSTAMP:20260510T235217Z
UID:58aa71ad9cb19a42f144378c1ce35e437a05ba19f7323003f8b26abc
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Brett Lucht\nUniversity of Rhode Island\nA solid electro
 lyte interphase (SEI) is generated on the anode of lithium ion batteries d
 uring the first few charging cycles.  The presence and stability of the S
 EI is critical to the performance of the battery. However\, despite thorou
 gh investigation of the SEI for 40 years\, the SEI remains poorly understo
 od.  Over the last decade additional investigations of the structure of t
 he initial SEI formed on graphite\, silicon and lithium metal electrodes a
 long with changes which occur to the SEI upon additional cycling have been
  conducted.  The investigations provide significant new insight into the 
 structure and evolution of the anode SEI. The SEI formation reactions have
  been complemented by investigations utilizing the one electron reducing a
 gent\, lithium napthalenide\, to independently prepare and investigated th
 e reduction products which constitute the SEI. The initial reduction produ
 cts of ethylene carbonate (EC) are lithium ethylene dicarbonate (LEDC) and
  ethylene.  However\, the instability of LEDC and related lithium alkyl c
 arbonates generates an intricate mixture of compounds which greatly compli
 cates the composition of the SEI.  The reduction products and their subse
 quent decomposition products have been thoroughly investigated via a combi
 nation of NMR\, XPS\, IR-ATR\, TGA\, and GC-MS.  Mechanisms for the gener
 ation of the complicated mixture of products will be discussed along with 
 the differences in the SEI structure and function for different anodes inc
 luding graphite\, silicon and lithium metal. \n \n \n 
LOCATION:BCH 2201 https://plan.epfl.ch/?room==BCH%202201
STATUS:CONFIRMED
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