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

16th International Conference on X-ray Absorption Fine Structure

Giorgetti, Marco^1 ; Wang, Diandian^1 ; Aquilanti, Giuliana^2 ; Buchholz, Daniel^3 ; Passerini, Stefano^3

Department of Industrial Chemistry, University of Bologna, Bologna

40136, Italy^1

ELETTRA, Sincrotrone Trieste S.C.p.A., s.s 14 km 163.5, Basovizza

39149, Italy^2

Helmholtz Institute Ulm (HIU), Ulm

89081, Germany^3

关键词: Cath-ode materials;    First discharge;    Lithium rich;    Local atomic structures;    Local geometry;    Local structure;    New high;    XAS techniques;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/712/1/012130/pdf
DOI  :  10.1088/1742-6596/712/1/012130

来源: IOP

【 摘 要 】

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 Li2MnO3and Li(x)Mn0.4Ni0.4Co0.2O2. 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 LiMO2(M = Ni and Co) and Li2MnO3. The strength and limitations of the ExAFS approach in these materials is underlined.