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On processing-structure-property relations and high ionic conductivity in garnet-type Li 5 La 3 Ta 2 O 12 solid electrolyte thin films grown by CO 2 -laser assisted CVD

Loho, Christoph and Djenadic, Ruzica and Mundt, Paul and Clemens, Oliver and Hahn, Horst (2017):
On processing-structure-property relations and high ionic conductivity in garnet-type Li 5 La 3 Ta 2 O 12 solid electrolyte thin films grown by CO 2 -laser assisted CVD.
In: Solid State Ionics, Elsevier Science Publishing, pp. 32-44, 313, ISSN 01672738,
DOI: 10.1016/j.ssi.2017.11.005,
[Online-Edition: https://doi.org/10.1016/j.ssi.2017.11.005],
[Article]

Abstract

This study reports on the optimization of garnet-type Li-ion conducting Li5La3Ta2O12 (LLTaO) solid electrolyte thin film growth by CO2-laser assisted chemical vapor deposition (LA-CVD) and the films' detailed structural as well as electrochemical characterization. By adapting the LA-CVD process parameters, high quality LLTaO films with tailored microstructures are successfully grown, which allows to correlate the films' microstructure and phase composition with their electrochemical performance. Explicitly, the influence of grain boundaries on the ionic conductivity is studied, and possible strategies to lower the grain boundary resistance are given. As deposited LLTaO films show a total ionic conductivity of 7.8·10− 6 S·cm− 1 at 298 K (activation energy of 0.66 eV). By applying a post-annealing treatment the total ionic conductivity is improved up to 3.8·10− 5 S·cm− 1 at 298 K (activation energy of 0.52 eV). This is among the highest ionic conductivities reported for Li-ion conducting garnet-type thin films so far. A better suitability of garnet-type Li5La3Ta2O12 films for fundamental research as well as for application in all-solid-state thin film lithium ion batteries compared to commonly investigated Li7La3Zr2O12 films is proposed and discussed.

Item Type: Article
Erschienen: 2017
Creators: Loho, Christoph and Djenadic, Ruzica and Mundt, Paul and Clemens, Oliver and Hahn, Horst
Title: On processing-structure-property relations and high ionic conductivity in garnet-type Li 5 La 3 Ta 2 O 12 solid electrolyte thin films grown by CO 2 -laser assisted CVD
Language: English
Abstract:

This study reports on the optimization of garnet-type Li-ion conducting Li5La3Ta2O12 (LLTaO) solid electrolyte thin film growth by CO2-laser assisted chemical vapor deposition (LA-CVD) and the films' detailed structural as well as electrochemical characterization. By adapting the LA-CVD process parameters, high quality LLTaO films with tailored microstructures are successfully grown, which allows to correlate the films' microstructure and phase composition with their electrochemical performance. Explicitly, the influence of grain boundaries on the ionic conductivity is studied, and possible strategies to lower the grain boundary resistance are given. As deposited LLTaO films show a total ionic conductivity of 7.8·10− 6 S·cm− 1 at 298 K (activation energy of 0.66 eV). By applying a post-annealing treatment the total ionic conductivity is improved up to 3.8·10− 5 S·cm− 1 at 298 K (activation energy of 0.52 eV). This is among the highest ionic conductivities reported for Li-ion conducting garnet-type thin films so far. A better suitability of garnet-type Li5La3Ta2O12 films for fundamental research as well as for application in all-solid-state thin film lithium ion batteries compared to commonly investigated Li7La3Zr2O12 films is proposed and discussed.

Journal or Publication Title: Solid State Ionics
Volume: 313
Publisher: Elsevier Science Publishing
Uncontrolled Keywords: Garnet-type Li5La3Ta2O12, Thin film, Solid electrolyte, Ionic conductivity, All-solid-state lithium ion battery, Chemical vapor deposition
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Electronic Materials
11 Department of Materials and Earth Sciences > Material Science > Fachgebiet Materialdesign durch Synthese
11 Department of Materials and Earth Sciences > Material Science > Joint Research Laboratory Nanomaterials
Date Deposited: 12 Dec 2018 09:15
DOI: 10.1016/j.ssi.2017.11.005
Official URL: https://doi.org/10.1016/j.ssi.2017.11.005
Funders: The authors gratefully acknowledge a major equipment grant “Competence South – Electrochemistry for Electromobility” from the Federal Ministry of Education and Research (contract no. 6091/89161/03KP801)., Further support for an equipment grant by the State of Hesse is appreciated., CL, RD and HH acknowledge the financial support by the Portfolio project “Electrochemical storage in systems” provided by Helmholtz Association., OC gratefully acknowledges support from the German Research Foundation within an Emmy Noether Research Fellowship (grant no. CL551/2-1).
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