cm502832b_si_001.pdf (932.01 kB)
Download fileSingle-Phase Lithiation and Delithiation of Simferite Compounds Li(Mg,Mn,Fe)PO4
journal contribution
posted on 2014-11-11, 00:00 authored by Fredrick Omenya, Joel K. Miller, Jin Fang, Bohua Wen, Ruibo Zhang, Qi Wang, Natasha A. Chernova, M. Stanley WhittinghamUnderstanding
the phase transformation behavior of electrode materials
for lithium ion batteries is critical in determining the electrode
kinetics and battery performance. Here, we demonstrate the lithiation/delithiation
mechanism and electrochemical behavior of the simferite compound,
LiMg0.5Fe0.3Mn0.2PO4.
In contrast to the equilibrium two-phase nature of LiFePO4, LiMg0.5Fe0.3Mn0.2PO4 undergoes a one-phase reaction mechanism as confirmed by ex situ
X-ray diffraction at different states of delithiation and electrochemical
measurements. The equilibrium voltage measurement by galvanostatic
intermittent titration technique shows a continuous change in voltage
at Mn3+/Mn2+ redox couple with addition of Mg2+ in LiMn0.4Fe0.6PO4 olivine
structure. There is, however, no significant change in the Fe3+/Fe2+ redox potential.
History
Usage metrics
Read the peer-reviewed publication
Categories
Keywords
Simferiteelectrochemical measurementsLiMg 0.5FeLithiationredoxmechanismDelithiationCompoundcontrastlithiationtitration techniqueLiMn 0.4Fe olivine structurenaturecoupleelectrode kineticsLiFePOdelithiationsimferite compoundelectrode materialsgalvanostaticbattery performancelithium ion batteriesequilibrium voltage measurementdiffractionelectrochemical behaviorphase transformation behavior