16th International Conference on X-ray Absorption Fine Structure | |
Local structure modification in lithium rich layered Li-Mn-O cathode material | |
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 |
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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.
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