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

Chen, CH Liu, J Amine, K

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

4

INGLESE

Article

Physical Chemistry/Chemical Physics

ELECTROCHEMISTRY COMMUNICATIONS

1388-2481 → ACNP

3

1

2001

44 - 47

ISI

1388-2481(200101)3:1<44:SCATSS>2.0.ZU;2-8

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.