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UID:69dbee96a55d3
DTSTAMP:20260412T151222
DTSTART:20170202T093000
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TRANSP:OPAQUE
DTEND:20170202T093000
URL:https://murmitoyen.com/events/vanille/udem/detail/745720-seminaire-cand
 idat-professeur-eric-mc-calla
LOCATION:Pavillon Roger-Gaudry \, 2900\, boul. Édouard-Montpetit\, Local M
 -415\, Montréal\, QC\, Canada
SUMMARY:Séminaire  - Candidat professeur - Éric Mc Calla
DESCRIPTION:Titre : “ Next-Generation Li-ion Positive Electrodes: Underst
 anding the Challenges ''Endroit : Pavillon Roger-Gaudry\, salle G-715 à
  9 h 30.
\nCette conférence sera prononcée par le Professeur Éric Mc
  Calla du Département de chimie de l'Université du Minnesota.
\nRésum
 é : Advanced Li-ion batteries utilizing Li-rich layered oxides as the pos
 itive electrode have the potential to substantially increase the energy de
 nsity of batteries as required for both personal electronics and electric 
 vehicles. Despite this\, there remain important challenges with respect to
  these materials which stem from a poor understanding of the synthesis con
 ditions and compositions required to make optimum materials and also an in
 complete description of the mechanisms taking place in the electrode mater
 ial during operation of the battery.  In this talk\, the former issue is 
 addressed by discussing detailed phase diagrams produced by way of combina
 torial XRD studies performed on thousands of samples with varying Li-Ni-Mn
 -O compositions.  These studies provide a great deal of insight into chan
 ges taking place during synthesis which are of high significance in indust
 rial settings\, but they also reveal new materials worthy of further study
 .  The second issue\, related to a poor understanding of the changes taki
 ng place during electrochemical cycling\, is also addressed here with deta
 iled studies of model systems with varied cationic chemistries (including 
 the use of Fe\, Te\, Sb\, Ir\, Sn and Ru).  This survey study revealed a 
 number of mechanisms taking place on the nanoscale during electrochemical 
 cycling and has suggested a number of future directions for improving posi
 tive electrode performance such as increasing the rigidity of the cationic
  network and increasing the covalency of the metal-oxygen bonds.
\n 
\nIn
 formation supplémentaireAffiche de la conférence
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