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Microstrain and electrochemical performance of garnet solid electrolyte integrated in a hybrid battery cell

Botros, Miriam and Scherer, Torsten and Popescu, Radian and Kilmametov, Askar and Clemens, Oliver and Hahn, Horst (2019):
Microstrain and electrochemical performance of garnet solid electrolyte integrated in a hybrid battery cell.
In: RSC Advances, 9 (53), pp. 31102-31114. Royal Society of Chemistry, ISSN 2046-2069,
DOI: 10.1039/c9ra07091e,
[Article]

Abstract

Garnet type solid electrolytes are promising candidates for replacing the flammable liquid electrolytes conventionally used in Li-ion batteries. Al-doped Li7La3Zr2O12 (LLZO) is synthesized using nebulized spray pyrolysis and field assisted sintering technology (FAST), a novel synthesis route ensuring the preparation of samples with a homogeneous elemental distribution and dense ceramic electrolytes. Ceramic preparation utilizing field assisted sintering, in particular the applied pressure, has significant influence on the material structure, i.e. microstrain, and thereby its electrochemical performance. The phenomenon of microstrain enhancement of electrochemical performance might open a new route towards improved garnet solid electrolytes. A detailed mechanism is proposed for the lattice distortion and resulting microstrain during sintering. The charge transfer resistance of Li-ions at the interface between LLZO and Li is characterized using AC impedance spectroscopy and is amongst the best reported values to date. Additionally, the solid electrolyte is integrated in a full hybrid cell, a practical approach combining all the advantages of the solid electrolyte, while maintaining good contact with the cathode material.

Item Type: Article
Erschienen: 2019
Creators: Botros, Miriam and Scherer, Torsten and Popescu, Radian and Kilmametov, Askar and Clemens, Oliver and Hahn, Horst
Title: Microstrain and electrochemical performance of garnet solid electrolyte integrated in a hybrid battery cell
Language: English
Abstract:

Garnet type solid electrolytes are promising candidates for replacing the flammable liquid electrolytes conventionally used in Li-ion batteries. Al-doped Li7La3Zr2O12 (LLZO) is synthesized using nebulized spray pyrolysis and field assisted sintering technology (FAST), a novel synthesis route ensuring the preparation of samples with a homogeneous elemental distribution and dense ceramic electrolytes. Ceramic preparation utilizing field assisted sintering, in particular the applied pressure, has significant influence on the material structure, i.e. microstrain, and thereby its electrochemical performance. The phenomenon of microstrain enhancement of electrochemical performance might open a new route towards improved garnet solid electrolytes. A detailed mechanism is proposed for the lattice distortion and resulting microstrain during sintering. The charge transfer resistance of Li-ions at the interface between LLZO and Li is characterized using AC impedance spectroscopy and is amongst the best reported values to date. Additionally, the solid electrolyte is integrated in a full hybrid cell, a practical approach combining all the advantages of the solid electrolyte, while maintaining good contact with the cathode material.

Journal or Publication Title: RSC Advances
Journal volume: 9
Number: 53
Publisher: Royal Society of Chemistry
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 > Fachgebiet Materialdesign durch Synthese
11 Department of Materials and Earth Sciences > Material Science > Joint Research Laboratory Nanomaterials
Date Deposited: 19 Feb 2020 07:35
DOI: 10.1039/c9ra07091e
Official URL: https://doi.org/10.1039/c9ra07091e
Projects: The authors would like to thank the Helmholtz Association (Germany) for financial support through the Helmholtz Portfolio Project "Electrochemical Storage in Systems - Reliability and Integration"., O. Clemens acknowledges funding within CL551/3-1 by the German Research Foundation (DFG)., Karlsruhe Nano Micro Facility (KNMF, Germany) and Christian Kubel are acknowledged for providing access to FIB crosssection preparation and SEM., KNMF provided access to HAADF-STEM at the Laboratory for Electron Microscopy (LEM) for which the authors are grateful., M. Botros would like to thank Ralf Riedel and his group for providing access to the lab for slurry-based cathode preparation., We acknowledge support by the KIT-Publication Fund of the Karlsruhe Institute of Technology.
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