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Anisotropic ionic conductivity of LiMn1−xFexPO4 (0 ≤ x ≤ 1) single crystals

We report AC-impedance studies on a series of high-quality LiMn1−xFexPO4 single crystals with 0 ≤ x ≤ 1. Our results confirm quasi-one-dimensional transport in LiFePO4 with fast Li-diffusion along the b-axis. The conductivities along the crystallographic b-, c- and a-axis differ by a factor of about...

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Bibliographic Details
Main Authors: Neef, Christoph (Author) , Reiser, Andreas (Author) , Thauer, Elisa (Author) , Klingeler, Rüdiger (Author)
Format: Article (Journal)
Language:English
Published: 03 January 2020
In: Solid state ionics
Year: 2020, Volume: 346
ISSN:0167-2738
DOI:10.1016/j.ssi.2019.115197
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1016/j.ssi.2019.115197
Verlag, lizenzpflichtig, Volltext: http://www.sciencedirect.com/science/article/pii/S0167273819300062
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Author Notes:C. Neef, A. Reiser, E. Thauer, R. Klingeler
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Summary:We report AC-impedance studies on a series of high-quality LiMn1−xFexPO4 single crystals with 0 ≤ x ≤ 1. Our results confirm quasi-one-dimensional transport in LiFePO4 with fast Li-diffusion along the b-axis. The conductivities along the crystallographic b-, c- and a-axis differ by a factor of about 10, respectively. Whereas, the activation energy EA of the effective diffusion process is particularly large for the b-axis and smallest for the a-axis. Remarkably, the b-axis ionic bulk conductivity of LiMn0.5Fe0.5PO4 is of the same order of magnitude as in undoped LiFePO4, which implies similarly fast Li-transport even upon 50% Mn-doping which, owing to the higher redox potential of the Mn3+/Mn2+-couple, yields enhanced energy density in lithium-ion batteries. The overall results of our impedance studies draw a far more complex picture than it would be expected from a simple one-dimensional ionic conductor. Our results suggest a strong contribution of crystal defects in actual materials.
Item Description:Im Titel sind 1, x und 4 tiefgestellt
Im Titel ist "kleiner gleich" als mathematisches Zeichen dargestellt
Gesehen am 15.04.2020
Physical Description:Online Resource
ISSN:0167-2738
DOI:10.1016/j.ssi.2019.115197

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