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VERSION:2.0
PRODID:icalendar-ruby
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METHOD:PUBLISH
BEGIN:VEVENT
DTSTAMP:20260418T190225Z
UID:https://www.mpie.de/events/44897/3755656
DTSTART:20260320T100000Z
DTEND:20260320T110000Z
CLASS:PUBLIC
CREATED:20260224T091643Z
DESCRIPTION:Lithium metal solid-state batteries have high potential for saf
 ety\, energy density\, and charging rate beyond that of Li-ion batteries. 
 A major challenge for lithium metal solid-state batteries is the formation
  of lithium dendrites across the solid electrolyte during cycling\, which 
 leads to short-circuiting and mechanical failure of the cell. The reason t
 hat dendrites form is not fully understood\, but evidence shows that dendr
 ites could initiate either at the surface or within the interior of the so
 lid electrolyte. Here\, I present our use of in-situ mechanical and electr
 ochemical testing to investigate dendrite initiation and propagation. Scan
 ning electron microscopy and optical microscopy are used to observe nano t
 o millimeter-scale structural changes in garnet-type oxide solid electroly
 tes (LLZO) and glassy sulfide electrolytes under mechanical loads and elec
 trochemical charging. We find that dendrite propagation follows Weibull st
 atistics in polycrystalline LLZO. Ag-doped LLZO shows increased resistance
  to dendrites under elevated mechanical loads due to compressive stress ef
 fects at the LLZO surface. Investigations on single crystal LLZO demonstra
 te that the role of surface flaws in the absence of grain boundaries\, and
  that Li plating can be achieved over large areas. Confocal raman spectros
 copy is used to understand chemical heterogeneities within a glassy sulfid
 e electrolyte control the mechanical failure. Lastly\, I present the effec
 t of biaxial compressive stress on dendrite initiation and propagation in 
 LLZO. The biaxial compressive stress is applied orthogonal to the electric
  field generation\, and serves to close cracks that extend from the anode\
 , through the electrolyte\, to the cathode. This allows lithium symmetric 
 cells to be cycled at current densities up to 100 mA/cm2\, for &gt\;10\,00
 0 cycles\, and provides evidence that lithium plating occurs within the in
 terior of LLZO when surface dendrite initiation is suppressed.\nSpeaker: P
 rof. Wendy Gu 
LAST-MODIFIED:20260224T092015Z
LOCATION:Max Planck Institute for Sustainable Materials\, Room: Large Confe
 rence Room No. 203
ORGANIZER;CN=on invitation of Yuwei Zhang / Prof. Gerhard Dehm:mailto:
SUMMARY:Mechanical and Microstructural Control of Dendrite Initiation and L
 i Plating on Oxide and Sulfide Solid Electrolytes
URL;VALUE=URI:https://www.mpie.de/events/44897/3755656
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