Symmetric cell approach towards simplified study of cathode and anode behavior in lithium ion batteries

Citation
Ch. Chen et al., Symmetric cell approach towards simplified study of cathode and anode behavior in lithium ion batteries, ELECTROCH C, 3(1), 2001, pp. 44-47
Citations number
4
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
ELECTROCHEMISTRY COMMUNICATIONS
ISSN journal
1388-2481 → ACNP
Volume
3
Issue
1
Year of publication
2001
Pages
44 - 47
Database
ISI
SICI code
1388-2481(200101)3:1<44:SCATSS>2.0.ZU;2-8
Abstract
It was observed that the impedance of 18 650 high-power cells using LiNi0.8 Co0.2O2 chemistry increased with time during the beginning period of storag e. A symmetric cell approach was adopted to isolate the effects of the posi tive and negative electrodes on the impedance of a laboratory-scale lithium ion cell using the same chemistry. The AC impedance spectra of a normal ce ll and symmetric cells were measured and compared. The cathode processes we re found to be most responsible for the cell impedance and the impedance ri se. In addition, the impedance spectra provide indirect evidence that surfa ce layers might be formed on both the positive and negative electrodes. (C) 2001 Published by Elsevier Science B.V.