NDLI: Aluminium-doped $LiFePO_{4}$ single crystals Part II. Ionic conductivity, diffusivity and defect model

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Amin, Ruhul Lin, Chengtian Maier, Joachim
Description	Country affiliation: Germany Author Affiliation: Amin R ( Max Planck Institute for Solid State Research, 70569, Stuttgart, Germany.)
Abstract	We report on lithium ion conductivity and diffusivity along major crystallographic directions of Al-doped $LiFePO_{4}$ single crystals. Impedance spectroscopy as well as galvanostatic polarization measurements have been carried out on the electronically blocking symmetric cell $LiAl/LiI/LiFe(Al)PO_{4}/LiI/LiAl.$ Neither ionic conductivity nor lithium diffusivity show anisotropy in the bc planes within the experimental error, but much lower values in the a-direction. Similar features were observed earlier by us for the pure single-crystal and the Si-doped single crystal. On Al-doping the ionic conductivity has increased while the electronic conductivity has decreased compared to undoped $LiFePO_{4}.$ Not only this donor doping effect but also the temperature dependence of ionic conductivity and of lithium-diffusivity are successfully interpreted in terms of lithium vacancies, holes and associates in the framework of a detailed defect chemical analysis. Ion–electron as well as ion–ion associates play a significant role in this system.
File Format	HTM / HTML
ISSN	14639076
Issue Number	24
Journal	Physical Chemistry Chemical Physics
Volume Number	10
e-ISSN	14639084
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2008-06-28
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Discipline Physics Discipline Biophysics Discipline Chemistry
Alternative Title	Aluminium-doped LiFePO4 single crystals. Part II. Ionic conductivity, diffusivity and defect model
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy Physical and Theoretical Chemistry

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