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DTSTAMP:20260405T182553Z
UID:1730385000@ist.ac.at
DTSTART:20241031T153000
DTEND:20241031T163000
DESCRIPTION:Speaker: Robert House\nhosted by Stefan Freunberger	\nAbstract:
  One of the biggest challenges facing lithium-ion batteries is how to incr
 ease their energy density. The cathode\, typically a layered lithium trans
 ition metal oxide\, represents a major limitation. One route to increase t
 he energy density is to store charge at high voltage on the oxide ions in 
 the cathode material. However\, removing electrons from lattice oxide ions
  typically results in structural instability leading to voltage hysteresis
  and voltage fade over cycling. Understanding the mechanism behind oxygen 
 redox is critical to overcoming these issues.Our recent investigations int
 o Li-rich cathodes have revealed that oxidized oxygen takes the form of O2
  molecules which are trapped in nanovoids in the structure. We have also s
 hown that these trapped O2 molecules can be reduced back to O2- on dischar
 ge providing a viable charge storage mechanism to explain oxygen redox. In
  this talk\, I will discuss the evidence1-3 for the formation and reductio
 n of trapped O2 and explore the impacts this has on the performance of oxy
 gen redox cathodes\, such as voltage hysteresis and fade.4\,5 I will show 
 how the formation of O2 extends to 4d and 5d transition metal oxides5\, di
 sordered rocksalt cathodes6 and even to non-Li-rich cathodes7. Finally\, I
  will show that it is possible to suppress this structural change and unde
 rgo reversible\, high voltage O-redox without voltage hysteresis8. Altoget
 her\, this understanding helps to explain the unusual properties of oxygen
  redox cathodes and informs how they might be harnessed to boost the energ
 y density of batteries.
LOCATION:Moonstone Seminar Room F\, ISTA
ORGANIZER:Rita.Pacarada@ist.ac.at
SUMMARY:Robert House: Oxygen-redox Chemistry in High Energy Density Battery
  Cathodes
URL:https://talks-calendar.ista.ac.at/events/5032
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