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Utilization of heavy alkali dopants as a beacon to study the cathode electrolyte decomposition layer in lithium-ion batteries

Utilization of heavy alkali dopants as a beacon to study the cathode electrolyte decomposition... We introduce low levels of CsClO4 and RbClO4 into the electrolyte of LiCoO2 electrochemical half-cells to probe the composition of the passivation film on the surface of the cathode, the electrolyte decomposition layer (EDL). The advantages of these heavy alkali dopants lie in their large ionic radii, which limit intercalation, yet their strong light scattering cross-section creates a beacon that highlights the formation of products near the cathode surface. Detailed surface analysis and depth profiling with X-ray photoelectron spectroscopy, and bulk analysis utilizing X-ray absorption spectroscopy, show evidence for the formation of Cs/Rb compounds, such as carbonates, halides, and perchlorates, similar to those formed by lithium in previous studies, but also reveal the significantly reduced mobility of the Cs/Rb relative to Li in the non-uniform EDL. This unique approach could open several presently untapped techniques to gather new information on the EDL in Li-ion batteries. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Ionics Springer Journals

Utilization of heavy alkali dopants as a beacon to study the cathode electrolyte decomposition layer in lithium-ion batteries

Ionics , Volume 22 (1) – Aug 21, 2015

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References (55)

Publisher
Springer Journals
Copyright
Copyright © 2015 by Springer-Verlag Berlin Heidelberg (outside the USA)
Subject
Chemistry; Electrochemistry; Renewable and Green Energy; Optical and Electronic Materials; Condensed Matter Physics; Energy Storage
ISSN
0947-7047
eISSN
1862-0760
DOI
10.1007/s11581-015-1519-7
Publisher site
See Article on Publisher Site

Abstract

We introduce low levels of CsClO4 and RbClO4 into the electrolyte of LiCoO2 electrochemical half-cells to probe the composition of the passivation film on the surface of the cathode, the electrolyte decomposition layer (EDL). The advantages of these heavy alkali dopants lie in their large ionic radii, which limit intercalation, yet their strong light scattering cross-section creates a beacon that highlights the formation of products near the cathode surface. Detailed surface analysis and depth profiling with X-ray photoelectron spectroscopy, and bulk analysis utilizing X-ray absorption spectroscopy, show evidence for the formation of Cs/Rb compounds, such as carbonates, halides, and perchlorates, similar to those formed by lithium in previous studies, but also reveal the significantly reduced mobility of the Cs/Rb relative to Li in the non-uniform EDL. This unique approach could open several presently untapped techniques to gather new information on the EDL in Li-ion batteries.

Journal

IonicsSpringer Journals

Published: Aug 21, 2015

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