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Single entity electrochemistry for the elucidation of lithiation kinetics of TiO2 particles in non-aqueous batteries

Authors :
Edgar Ventosa
Tobias Löffler
Wolfgang Schuhmann
Kristina Tschulik
Patrick Wilde
Jan Clausmeyer
Source :
Nano Energy. 57:827-834
Publication Year :
2019
Publisher :
Elsevier BV, 2019.

Abstract

In battery research, the development of analytical techniques is of key importance for determining intrinsic properties of active materials ultimately dictating the battery performance. We report the application of nano-impact electrochemistry to gain insight into the intrinsic properties of commercial battery materials i.e. TiO2 particles in non-aqueous media. Potentiostatic lithiation measurements do not only provide qualitative information about the rate-limiting step in the lithiation process, but also demonstrate that nano-impact electrochemistry is a suitable technique in non-aqueous media in complete absence of oxygen and water. Our results reveal that the intrinsic lithiation rate of individual TiO2 particles is not – as generally assumed – determined by interfacial ion transfer kinetics, mobility of ion and/or electrons in the bulk of the particle, but by the solid-solid electron transfer. These findings have important implications for future studies of fundamental properties of battery materials considering that charge transfer in battery electrodes does not always obey Butler-Volmer kinetics.

Details

ISSN :
22112855
Volume :
57
Database :
OpenAIRE
Journal :
Nano Energy
Accession number :
edsair.doi...........4d95981223d3739a88546e155127c38f
Full Text :
https://doi.org/10.1016/j.nanoen.2018.12.064