Electronic and Ionic Wirings Versus the Insertion Reaction Contributions to the Polarization in LiFePO[sub 4] Composite Electrodes
- 1 January 2010
- journal article
- Published by The Electrochemical Society in Journal of the Electrochemical Society
- Vol. 157 (12), A1347-A1353
- https://doi.org/10.1149/1.3497353
Abstract
The different contributions to the polarization of a LiFePO4LiFePO4 electrode are experimentally discriminated in this work. The electrode total resistance is dominated at high rate by the contribution of the electronic and the ionic wires, the former being more important in the case of electrodes with low compaction, while the latter being more important in the case of electrodes with high compaction. A porosity in the 35%–40% range allows to minimize the electrode polarization. At low rate, the electrode resistance is dominated by the resistance to lithium insertion into the active mass and follows the predictions of M. Gaberscek and J. Jamnik [ Solid State Ionics , 177 , 2647 (2006)] . We show here that the resistance to lithium insertion decreases with the increase of the specific current, a feature that suggests an increase of the active particle conductivity with rate. The easy-handling methodology described in this work should enable a more rational optimization of the electrode formulation and processing conditions for better electrochemical performance.Keywords
This publication has 46 references indexed in Scilit:
- Aging of LiFePO4 upon exposure to H2OJournal of Power Sources, 2008
- Air Exposure Effect on LiFePO[sub 4]Electrochemical and Solid-State Letters, 2008
- Impurities in LiFePO[sub 4] and Their Influence on Material CharacteristicsJournal of the Electrochemical Society, 2008
- Is LiFePO[sub 4] Stable in Water?Electrochemical and Solid-State Letters, 2008
- Size Effects on Carbon-Free LiFePO[sub 4] PowdersElectrochemical and Solid-State Letters, 2006
- Reduction Fe[sup 3+] of Impurities in LiFePO[sub 4] from Pyrolysis of Organic Precursor Used for Carbon DepositionJournal of the Electrochemical Society, 2006
- Electroactivity of natural and synthetic triphyliteJournal of Power Sources, 2001
- Approaching Theoretical Capacity of LiFePO[sub 4] at Room Temperature at High RatesElectrochemical and Solid-State Letters, 2001
- Optimized LiFePO[sub 4] for Lithium Battery CathodesJournal of the Electrochemical Society, 2001
- Phospho‐olivines as Positive‐Electrode Materials for Rechargeable Lithium BatteriesJournal of the Electrochemical Society, 1997