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X-WR-CALNAME:StorageX Seminar - The Lithium Anode in Solid State Batteries 
 and Oxygen Redox in High-capacity Lithium Battery Cathodes
X-WR-TIMEZONE:Pacific Time (US & Canada)
BEGIN:VEVENT
DTSTAMP:20260807T160605Z
UID:tag:localist.com\,2008:EventInstance_49118875736129
DTSTART:20250318T180000Z
DTEND:20250318T193000Z
DESCRIPTION:Speaker\n\nPeter Bruce\, Professor\, Departments of Materials a
 nd Chemistry\nUniversity of Oxford \n\nTalk Abstract:\n\nSolid State Batte
 ries\n\nThe solid-state battery is widely regarded as the next frontier in
  battery technology\, offering a stepchange in energy density and safety. 
 Of the challenges facing realisation of the all-solid-state battery\, soli
 d/solid interfaces rank high. At the lithium metal / ceramic electrolyte i
 nterface\, dendrites (fingers of lithium) can form on charging and penetra
 te the ceramic leading to short circuit and cell failure.\n\nTypically\, f
 or relatively dense ceramics\, this occurs above a critical charging curre
 nt (CCD). It has often been suggested that densification of the ceramic el
 ectrolyte should benefit charging. However\, not all changes in microstruc
 ture on densification are predicted to lead to an increase in CCD\, some c
 hanges are positive while others are negative. The relationship between th
 e ceramic microstructure\, densification and the CCD will be considered wi
 th particular reference to the highly conducting Argyrodite solid electrol
 yte\, Li6PS5Cl.\n\nLithium-rich Cathodes\n\nLi-ion battery cathodes that c
 an store more energy than those in use today are an important target for m
 aterials research. The challenge has proved formidable and demands a deepe
 r understanding of the science underpinning intercalation cathodes.\n\nFor
  over 20 years it has been known that on charging\, more Li+ can be remove
 d from layered compounds such as Li[Li0.2Ni0.2Mn0.6]O2 or Li[Li0.2Ni0.13Co
 0.13Mn0.54]O2 than is charge compensated by transition metal oxidation. Th
 e additional electrons are removed from the O2- ions. Many excellent contr
 ibutions have been made in an endeavour to understand oxygen redox\, the n
 ature of the hole states and their link to the resulting structural change
 s.\n\nWe have shown that oxidation of O2- forms O2 that is either evolved 
 from the surface of the particles or trapped in nano-voids formed in the b
 ulk by reorganisation of the Li vacancies on the transition metal sites wi
 thin the structure. Although O2 in these nano-voids can be reduced back to
  O2-\, the process is not energetically reversible\, resulting in the 1st 
 cycle voltage hysteresis (approx. 1eV is lost). This mechanism also has im
 plications which play out over extended cycling. The voids grow in size an
 d O2 cannot be fully reduced\, rationalising the well known problem of vol
 tage fade in Li rich materials. It is possible to suppress O2 formation\, 
 trapping hole states on O2- and obtaining energetic (voltage) and structur
 al reversibility. The electron holes are not localised on oxygen but itine
 rant. Such behaviour may point the way towards practical high energy densi
 ty cathodes for Li-ion batteries.\n\nBio:\nProfessor Sir Peter G Bruce\, F
 RS\, FRSE\, FRSC\, MAE\, IoM\, ML\, is Wolfson Professor of Materials at t
 he University of Oxford\, UK. He co-founded the Faraday Institution\, the 
 UK’s centre of excellence for research on electrochemical energy storage
 \, and serves as its Chief Scientist. From 2018-2023 he served as Physical
  Secretary and Vice President of the Royal Society (UK Academy of Sciences
 ).\n\nPeter’s research interests embrace materials chemistry and electro
 chemistry\, especially lithium and sodium batteries. Recent efforts have f
 ocused on the synthesis and understanding of new high capacity cathode mat
 erials for lithium-ion batteries\, the processes taking place in solid-sta
 te batteries and the challenges of the lithium-air battery.\n\nPeter’s r
 esearch has been recognised by a number of awards and fellowships. He has 
 received the Tilden Prize\, the Liversidge Award and the Longstaff Prize f
 rom the Royal Society nof Chemistry\, the Carl Wagner Award of the Electro
 chemical Society (USA) and the Hughes Medal of the Royal Society. He has b
 een named as a Highly Cited Researcher by Thomson Reuters/Clarivate every 
 year since 2015. Peter was elected as a member of the Chinese Academy of S
 ciences in 2023 and the German Academy of Sciences\, Leopoldina\, in 2024.
  In the 2022 Queen’s Birthday Honours List\, Peter received a knighthood
  for his services to science and innovation.
GEO:37.427405;-122.1697
LOCATION:Building 300\, 300
SUMMARY:StorageX Seminar - The Lithium Anode in Solid State Batteries and 
 Oxygen Redox in High-capacity Lithium Battery Cathodes
URL;VALUE=URI:https://events.stanford.edu/event/storagex-seminar-the-lithiu
 m-anode-in-solid-state-batteries-andoxygen-redox-in-high-capacity-lithium-
 battery-cathodes
CATEGORIES:Class/Seminar
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