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 and Christian Kübel, 2016
Fusion TEM holder tip
Image courtesy of Microsc. Res. Tech.

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/La0.9Ba0.1F2.9 half-cell are presented.

Impact Statement

Sample preparation of all-solid-state fluoride ion batteries using FIB has been discussed extensively, where redeposition, resistivity, porosity of the electrodes/electrolyte and leakage current are addressed. Through HRTEM imaging and diffraction patterns both anode and cathode sides were studied.