Modeling the impedance versus voltage characteristics of LiNi0.8Co0.15Al0.05O2

The power-delivery capability of lithium-ion cells based on LiNi0.8Co0.15Al0.05O2-based positive electrodes shows a significant dependence on the cell's state-of-charge. One reason for this behavior is the variation of the positive electrode's impedance with the oxide's lithium conten...

Full description

Saved in:
Bibliographic Details
Published in:Electrochimica acta 2008, Vol.53 (5), p.2121-2129
Main Authors: ABRAHAM, D. P, KAWAUCHI, S, DEES, D. W
Format: Article
Language:English
Subjects:
Applied sciences
Direct energy conversion and energy accumulation
Electrical engineering. Electrical power engineering
Electrical power engineering
Electrochemical conversion: primary and secondary batteries, fuel cells
Exact sciences and technology
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The power-delivery capability of lithium-ion cells based on LiNi0.8Co0.15Al0.05O2-based positive electrodes shows a significant dependence on the cell's state-of-charge. One reason for this behavior is the variation of the positive electrode's impedance with the oxide's lithium content. In this article, an electrochemical model based on concentrated solution porous electrode theory is used to model impedance data obtained on LiNi0.8Co0.15Al0.05O2-based positive electrodes charged to potentials ranging from 3.55 to 4.55V versus Li. The parameters obtained from model fits include the exchange-current density and Li-ion diffusion coefficients in the oxide. The variations in these parameters with oxide potential are correlated with structural changes in the material observed during Li-ion intercalation-deintercalation reactions.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2007.09.018