An X-Ray Absorption Spectroscopy Study of Ball-Milled Lithium Tantalate and Lithium Titanate Nanocrystals

2016 International Conference on Defects in Insulating Materials

Chadwick, A.V.^1 ; Pickup, D.M.^1 ; Ramos, S.^1 ; Cibin, G.^2 ; Tapia-Ruiz, N.^3 ; Breuer, S.^4 ; Wohlmuth, D.^4 ; Wilkening, M.^4

School of Physical Sciences, University of Kent, Canterbury, Kent

CT2 7NH, United Kingdom^1

Diamond Light Source, Diamond House, Harwell Campus, Oxfordshire, Didcot

OX11 0DE, United Kingdom^2

Department of Materials, University of Oxford, Parks Road, Oxford

OX1 3PH, United Kingdom^3

Institute for Chemistry and Technology of Materials, Christian Doppler Laboratory for Lithium Batteries, Graz University of Technology, Stremayrgasse 9, Graz

8010, Austria^4

关键词: Amorphous content;    Ball-milled;    Lithium ions;    Lithium titanate;    Lithium-ion conductivity;    Milling time;    Nanocrystalline sample;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/169/1/012015/pdf
DOI  :  10.1088/1757-899X/169/1/012015

来源: IOP

【 摘 要 】

Previous work has shown that nanocrystalline samples of lithium tantalate and titanate prepared by high-energy milling show unusually high lithium ion conductivity. Here, we report an X-ray absorption spectroscopy (XAS) study at the Ti K-edge and the Ta L3edge of samples that have been milled for various lengths of time. For both systems the results show that milling creates amorphous material whose quantity increases with the milling time. The more extensive data for the tantalate shows that milling for only 30 minutes generates ∼25% amorphous content in the sample. The content rises to ∼60% after 16 hours. It is suggested that it is the motion of the lithium ions through the amorphous content that provides the mechanism for the high ionic conductivity.