Combined XAS and XRD “in operando” insights in Li ion intercalation in cathode materials with spatial resolution.

KHALIL JORI; MARIA PIA QUIROGA ARGAÑARAZ; AUGUSTO RODRÍGUEZ; MIGUEL ÁNGEL SANSERVINO; MARIELA ORTIZ; JOAQUIN M. SILVEIRA; JOSÉ MARTÍN RAMALLO LÓPEZ; LISANDRO J. GIOVANETTI; FÉLIX G. REQUEJO; DARIO FERREIRA SANCHEZ; CHAYENE GONCALVES ANCHIETA; CARLOS ESCUDERO

Campinas

Conferencia; 41st International Conference on Vacuum Ultraviolet and X-ray Physics (VUVX 2023); 2023

The Brazilian Synchrotron Light Laboratory (LNLS) of the Brazilian Center for Research in Energy and Materials (CNPEM) and the Institute of Physics of University of Campinas (UNICAMP)

Recent Lithium-ion batteries (LIBs) studies are devoted to understanding the interfaceprocesses that are crucial in the reversible Li ion uptake. Some of the most promisingcathodes for LIBs are based on LiFePO4 (LFP), Mn and Ni spinel’s (LMNO) and Lithium richlayered materials (Li Rich) between others. Those materials arise as candidates becausethey are safer and cheaper to produce and possess higher energy densities compared withthe state-of-the art LiCoO2 (LCO). In general the mechanism of Li ion intercalation isgoverned by processes that occur in a homogeneous way and in different scales of sizes thatgo from microns to a few nanometers. For this reason, spatial resolution arises as a need inorder to understand this intricate process. For example, XRD is a widely used technique for the structural characterization of these materials, providing valuable insights into their crystal structure,phase composition, crystallite size. More recently X ray absorption (XAS) arises as beingstrongly sensitive technique for oxidation state and coordination chemistry characterizationof the absorbing atom of interest. In this work we combine XAS and XRD measurements performed in operando conditions at NOTOS beamline at ALBA to obtain an average characterization of LIB cathode materials. Those materials were also characterized by XRD with spatial resolution of 1 micron in operando during Li ion intercalation at Micro XAS beamline at SLS synchrotron.