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SUMMARY:Working Mechanisms of Conversion-Type Metaphosphate Electrodes for
  Lithium/Sodium-Ion Batteries
DTSTART;VALUE=DATE-TIME:20211125T074200Z
DTEND;VALUE=DATE-TIME:20211125T074300Z
DTSTAMP;VALUE=DATE-TIME:20260306T090200Z
UID:indico-contribution-4349@events01.synchrotron.org.au
DESCRIPTION:Speakers: Qingbo Xia (The University of Sydney)\nThe developme
 nt of novel high-performance electrodes is crucial for the next generation
  of lithium/sodium-ion batteries (LIBs/SIBs) that can charge rapidly while
  maintaining high lithium/sodium storage capacity. One of the major resear
 ch directions to achieve improved energy/power densities of LIBs/SIBs has\
 , thus far\, focused on electrode materials that can store Li+/Na+ through
  conversion reactions. Our group has discovered and systematically studied
  a new family of conversion-type electrode materials\, the transition meta
 l metaphosphates [M(PO3)n (M = Mn\, Fe\, Co\, Ni and Cu\; n = 1\, 2\, 3)].
  Unlike traditional conversion-type monoanionic compounds such as oxides\,
  nitrides and fluorides which rely on nanomaterials engineering\, these me
 taphosphates can achieve full capacities and fast Li+/Na+ diffusion kineti
 cs from micro-sized samples synthesised by conventional solid-state method
 s. We studied their conversion reactions using a combination of in situ x-
 ray powder diffraction (XRPD)\, in/ex situ X-ray absorption near-edge spec
 troscopy (XANES)\, and ex situ high resolution transmission electron micro
 scopy (HRTEM). During the initial discharging\, these compounds convert in
 to amorphous ceramic composites with high electrochemical activities in wh
 ich fine transition metal nanograins are embedded in a glassy LiPO3 matrix
 . Glassy LiPO3 is an excellent Li+ conductor due to the low iconicity of P
 O3-\, and it can buffer the volume change of the electrode to maintain its
  integrity\, thus leading to much better electrochemical reversibility and
  cycling stability than monoanionic compounds. In the following first char
 ge\, the electrode converts back to a metaphosphate in terms of its compos
 ition but does not recrystallise. In subsequent cycles\, the metaphosphate
  electrodes in an amorphous form continue to react with Li+/Na+ reversibly
 .\n\nhttps://events01.synchrotron.org.au/event/146/contributions/4349/
LOCATION:Online
URL:https://events01.synchrotron.org.au/event/146/contributions/4349/
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