cm403115t_si_001.pdf (4.16 MB)
Charging and Discharging Behavior of Solvothermal LiFePO4 Cathode Material Investigated by Combined EELS/NEXAFS Study
journal contribution
posted on 2014-01-28, 00:00 authored by Manfred E. Schuster, Detre Teschner, Jelena Popovic, Nils Ohmer, Frank Girgsdies, Julian Tornow, Marc G. Willinger, Dominik Samuelis, Maria-Magdalena Titirici, Joachim Maier, Robert SchlöglLiFePO4 cathode material obtained via solvothermal synthesis
was investigated at several charging and discharging stages by a combination
of bulk (EELS) and surface sensitive (NEXAFS) methods in order to
get insight into the distribution of Li in the surface and bulk region
of the particles. Different behavior was observed as a function of
the particles morphology. The turbostratic stacking of layers in nanosized
crystals induces higher dimensional defects responsible for sluggish
Li insertion and extraction within the structure. In contrast, microstructured
crystals without higher dimensional defects do not exhibit sluggish
Li insertion/extraction, and achieve a higher degree of reversibility
during electrochemical cycling.