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SUMMARY:Materials Innovation for Next-Generation Batteries
DTSTART:20181205T110000
DTEND:20181205T120000
DTSTAMP:20260407T073953Z
UID:b336b88714a9dc75a0ea1759b71996401bfafeb6ea5d8fb143b66a70
CATEGORIES:Conferences - Seminars
DESCRIPTION:Corsin Battaglia\n\nEmpa – Swiss Federal Laboratories for Ma
 terials Science and Technology\,\n\nLaboratory Materials for Energy Conver
 sion  \n\nUeberlandstrasse 129\, 8600 Duebendorf\n\n \nLithium-ion batte
 ries enabled the success of portable electronics and find increasingly app
 lication in electric vehicles and in centralized and decentralized station
 ary storage for the temporal and spatial balancing of energy supply and de
 mand.\nWe are investigating cathode materials for next-generation lithium-
 ion batteries. Our research focuses on nickel-rich layered oxides with red
 uced content of critical cobalt. Increasing the nickel content in layered 
 oxides offers significantly improved lithium storage capacity\, but at the
  price of reduced cycling stability. Employing sacrificial electrolyte add
 itives\, we were able to demonstrate a NMC811/graphite full cell with a ca
 pacity retention of >90% after 200 cycles.\nTo improve operational safety 
 and reduced cell production costs\, we are also developing concepts to rep
 lace the liquid electrolytes based on highly flammable organic solvents in
  lithium- and sodium-ion batteries by non-flammable aqueous electrolytes. 
 The major disadvantage of water as electrolyte solvent is its intrinsicall
 y narrow electrochemical stability window (thermodynamically only 1.23 V) 
 limiting maximum cell voltage and consequently the batteries energy densit
 y. We recently discovered an aqueous sodium-ion electrolyte system with a 
 much wider electrochemical stability window of 2.6 V enabling us to demons
 trate a NaTi2(PO4)3/Na3(VOPO4)2F full cell with 85% capacity retention aft
 er 500 cycles [1].\nWe are also developing solid-state electrolytes for al
 l-solid-state batteries based on closoborate salts and recently reported a
  mixed-anion Na4B12H12B10H10 closoborate phase offering high sodium ion co
 nductivity of 1 mS/cm at room temperature. This achievement further enable
 d us to assemble an all-solid-state battery with a sodium metal anode and 
 a NaCrO2 cathode delivering a capacity retention of 85% after 250 cycles b
 ringing this class of materials to a technology readiness level comparable
  to other current all-solid-state battery concepts [2].\n \nReferences:\n
 [1] Kühnel R.-S.\, Reber D.\, Battaglia C.\, ACS Energy Lett.\, 2017\, 2\
 , 2005.\n[2] Duchêne L.\, Kühnel R.-S.\,  Stilp E.\, Cuervo Reyes E.\, 
 Remhof A.\, Hagemann H.\, Battaglia C.\, Energy Environ. Science\, 2017\, 
 10\, 2609.\n \n 
LOCATION:I17 4 K2 https://plan.epfl.ch/?room==I17%204%20K2
STATUS:CONFIRMED
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