# Local structure modification in lithium rich layered Li-Mn-O cathode material

Giorgetti, M.; Wang, D.; Aquilanti, G.; Buchholz, D.; Passerini, S.

Abstract:
X-ray absorption spectroscopy (XAS) is applied to study the local geometry of Co, Ni, and Mn sites in a new high voltage cathode for lithium batteries. The material is a solid solution between Li$_{2}$MnO$_{3}$ and Li$_{(x)}$Mn$_{0.4}$Ni$_{0.4}$Co$_{0.2}$O$_{2}$. The XAS technique has permitted to check the local atomic structure and charge associated with the metals in a series of electrodes with different lithium concentration x, obtained during the first charge operation, and compared to the first discharge and a successive charge. The ex-situ XAS investigation on the initial activation of the cathode material (first charge) can be described by two separated reaction of LiMO$_{2}$ (M = Ni and Co) and Li$_{2}$MnO$_{3}$. The strength and limitations of the EXAFS approach in these materials is underlined.

 Zugehörige Institution(en) am KIT Helmholtz-Institut Ulm (HIU) Publikationstyp Zeitschriftenaufsatz Jahr 2016 Sprache Englisch Identifikator ISSN: 1742-6588KITopen-ID: 1000058047 HGF-Programm 37.01.01 (POF III, LK 01) Erschienen in Journal of physics / Conference Series Band 712 Heft 1 Seiten 012130 Nachgewiesen in Scopus
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