Reprint of "Studies of local degradation phenomena in composite cathodes for lithium-ion batteries"

Reprint of "Studies of local degradation phenomena in composite cathodes for lithium-ion batteries"

TitleReprint of "Studies of local degradation phenomena in composite cathodes for lithium-ion batteries"
Publication TypeJournal Article
Year of Publication2007
AuthorsMarie Kerlau, Marek Marcinek, Venkat Srinivasan, Robert Kostecki
JournalElectrochimica Acta
Volume53
1385
Issue3
Pagination1385-1392
Date Published12/2007
Keywordscathode, degradation, li-ion battery, raman microscopy
Abstract

LiNi0.8Co0.15Al0.05O2 and LiNi1/3Co1/3Mn1/3O2 composite cathodes were cycled in model cells to study interfacial phenomena that could lead to electrode degradation. Ex situ spectroscopic analysis of the tested cathodes, which suffered substantial power and capacity loss, showed that the state of charge (SOC) of oxide particles on the cathode surface was highly non-uniform despite the deep discharge of the Li-ion cell at the end of the test. The inconsistent kinetic behavior of individual oxide particles was attributed to the degradation of electronic pathways within the composite cathodes. A simple theoretical model based on a distributed network showed that an increase of the contact resistance between composite electrode particles may be responsible for non-uniform local kinetic behavior of individual oxide particles and the overall degradation of electrochemical performance of composite electrodes.

Notes

INNOVATIVE ELECTROCHEMISTRY ENTERPRISING SCIENCE

Selection of papers from the 57th Annual Meeting of the International Society of Electrochemistry 27 August-1 September 2006, Edinburgh, UK

DOI10.1016/j.electacta.2007.10.009