In situ TEM studies of micron-sized all-solid-state fluoride ion batteries: Preparation, prospects, and challenges

Mohammed Hammad Fawey; Venkata Sai Kiran Chakravadhanula; Munnangi Anji Reddy; Carine Rongeat; Torsten Scherer; Horst Hahn; Maximilian Fichtner; Christian Kübel

doi:10.1002/jemt.22675

In situ TEM studies of micron-sized all-solid-state fluoride ion batteries: Preparation, prospects, and challenges

Microsc Res Tech. 2016 Jul;79(7):615-24. doi: 10.1002/jemt.22675. Epub 2016 May 4.

Authors

Mohammed Hammad Fawey^{1

2}, Venkata Sai Kiran Chakravadhanula^{1

2

3

4}, Munnangi Anji Reddy^{1

3}, Carine Rongeat¹, Torsten Scherer^{1

4}, Horst Hahn^{1

2

3}, Maximilian Fichtner^{1

3}, Christian Kübel^{1

3

4}

Affiliations

¹ Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
² Joint Research Laboratory Nanomaterials (KIT and TUD) at Technische Universität Darmstadt (TUD), Jovanka-Bontschits-Str. 2, Darmstadt, 64287, Germany.
³ Helmholtz Institute Ulm for Electrochemical Energy Storage (HIU), Karlsruhe Institute of Technology (KIT), Helmholtzstr. 11, Ulm, 89081, Germany.
⁴ Karlsruhe Nano Micro Facility (KNMF), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.

PMID: 27145192
DOI: 10.1002/jemt.22675

Abstract

Trustworthy preparation and contacting of micron-sized batteries is an essential task to enable reliable in situ TEM studies during electrochemical biasing. Some of the challenges and solutions for the preparation of all-solid-state batteries for in situ TEM electrochemical studies are discussed using an optimized focused ion beam (FIB) approach. In particular redeposition, resistivity, porosity of the electrodes/electrolyte and leakage current are addressed. Overcoming these challenges, an all-solid-state fluoride ion battery has been prepared as a model system for in situ TEM electrochemical biasing studies and first results on a Bi/La0.9 Ba0.1 F2.9 half-cell are presented. Microsc. Res. Tech. 79:615-624, 2016. © 2016 Wiley Periodicals, Inc.

Keywords: all-solid-state-battery; fluoride ion battery; focused ion beam (FIB); in situ transmission electron microscopy (TEM); solid-state electrochemistry.