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SUMMARY:Molecular Origin of Capacity Fade in Sodium Ion Batteries - Dr. La
 uren Marbella (Department of Chemistry\, University of Cambridge)
DTSTART:20171109T131000Z
DTEND:20171109T140000Z
UID:TALK81001@talks.cam.ac.uk
CONTACT:Lorena Escudero
DESCRIPTION:Lauren E. Marbella\,1 Kent J. Griffith\,1 Matthias F. Groh\,1 
 Joseph Nelson\,2 Matthew Evans\,2 Andrew J. Morris\,2 and Clare P. Grey1\,
 *\n\n1University of Cambridge\, Department of Chemistry\, Lensfield Road\,
  Cambridge CB2 1EW\, United Kingdom\n2University of Cambridge\, Theory of 
 Condensed Matter Group\, Cavendish Laboratory\, J. J. Thomson Avenue\, CB3
  0HE\, United Kingdom\n\nAs the demand for batteries for portable electron
 ics\, electric vehicles\, and large-scale energy storage continues to incr
 ease\, improvements in capacity\, safety\, lifetime\, and particularly cos
 t\, to the current Li-ion standard are crucial. To address these needs\, N
 a-ion batteries are a promising alternative for long-term energy storage s
 ustainability in terms of both cost and natural abundance. For example\, h
 ighly competitive layered Na-transition metal phosphate and oxide intercal
 ation cathode materials offer a cost-effective alternative to their Li-ion
  counterparts. Further\, Na-ion systems allow the replacement of expensive
  Cu current collectors with Al. However\, robust candidates for anode mate
 rials in Na systems that offer equivalent capacities are lacking. As a res
 ult\, progress in the development of suitable Na-ion batteries has been su
 bstantially stalled. Typical anode materials that are high performing for 
 Li-ion systems\, such as Si and graphite\, do not reversibly store Na ions
  or suffer from low capacities\, respectively. Otherwise\, the high theore
 tical capacity for the formation of Na3P (2596 mAh/g) makes phosphorus-bas
 ed materials promising candidates for anodes in Na-ion systems. \nIndeed\
 , by combining elemental phosphorus with conductive carbon\, we can produc
 e high capacity (2510 mAh/g) in Na-ion batteries. However\, while we find
  that performance near that of theoretical capacity is reached in the firs
 t cycle\, the capacity retention in phosphorus anodes is poor. Here\, we u
 se advanced nuclear magnetic resonance (NMR) techniques (ultrafast magic-a
 ngle spinning\, variable temperature quadrupolar NMR\, and two dimensional
  phase adjusted spinning sidebands experiments) to probe the phase chemist
 ry and structural transformations that occur during electrochemical cyclin
 g to begin to understand the processes that are responsible for capacity f
 ade in phosphorus anodes in Na-ion batteries. The insights gained from thi
 s work should help to guide the design and formulation of electrode materi
 als used in next generation electrochemical energy storage devices.\n
LOCATION:The Richard King Room\, Darwin College
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