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CATEGORIES:Darwin College Science Seminars
SUMMARY:Molecular Origin of Capacity Fade in Sodium Ion Ba
 tteries - Dr. Lauren Marbella (Department of Chemi
 stry\, University of Cambridge)
DTSTART;TZID=Europe/London:20171109T131000
DTEND;TZID=Europe/London:20171109T140000
UID:TALK81001AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/81001
DESCRIPTION:Lauren E. Marbella\,1 Kent J. Griffith\,1 Matthias
  F. Groh\,1 Joseph Nelson\,2 Matthew Evans\,2 Andr
 ew J. Morris\,2 and Clare P. Grey1\,*\n\n1Universi
 ty of Cambridge\, Department of Chemistry\, Lensfi
 eld Road\, Cambridge CB2 1EW\, United Kingdom\n2Un
 iversity of Cambridge\, Theory of Condensed Matter
  Group\, Cavendish Laboratory\, J. J. Thomson Aven
 ue\, CB3 0HE\, United Kingdom\n\nAs the demand for
  batteries for portable electronics\, electric veh
 icles\, and large-scale energy storage continues t
 o increase\, improvements in capacity\, safety\, l
 ifetime\, and particularly cost\, to the current L
 i-ion standard are crucial. To address these needs
 \, Na-ion batteries are a promising alternative fo
 r long-term energy storage sustainability in terms
  of both cost and natural abundance. For example\,
  highly competitive layered Na-transition metal ph
 osphate and oxide intercalation cathode materials 
 offer a cost-effective alternative to their Li-ion
  counterparts. Further\, Na-ion systems allow the 
 replacement of expensive Cu current collectors wit
 h Al. However\, robust candidates for anode materi
 als in Na systems that offer equivalent capacities
  are lacking. As a result\, progress in the develo
 pment of suitable Na-ion batteries has been substa
 ntially stalled. Typical anode materials that are 
 high performing for Li-ion systems\, such as Si an
 d graphite\, do not reversibly store Na ions or su
 ffer from low capacities\, respectively. Otherwise
 \, the high theoretical capacity for the formation
  of Na3P (2596 mAh/g) makes phosphorus-based mater
 ials promising candidates for anodes in Na-ion sys
 tems. \nIndeed\, by combining elemental phosphorus
  with conductive carbon\, we can produce high capa
 city (2510 mAh/g) in Na-ion batteries. However\, w
 hile we find that performance near that of theoret
 ical capacity is reached in the first cycle\, the 
 capacity retention in phosphorus anodes is poor. H
 ere\, we use advanced nuclear magnetic resonance (
 NMR) techniques (ultrafast magic-angle spinning\, 
 variable temperature quadrupolar NMR\, and two dim
 ensional phase adjusted spinning sidebands experim
 ents) to probe the phase chemistry and structural 
 transformations that occur during electrochemical 
 cycling to begin to understand the processes that 
 are responsible for capacity fade in phosphorus an
 odes in Na-ion batteries. The insights gained from
  this work should help to guide the design and for
 mulation of electrode materials used in next gener
 ation electrochemical energy storage devices.\n
LOCATION:The Richard King Room\, Darwin College
CONTACT:Lorena Escudero
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