Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 9, Issue 12, Pages 2778-2783Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2007.09.020
Keywords
LiFePO4; particle size; carbon coating; wiring; electrode resistance; transport kinetics
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Based on careful analysis of nine papers by different research groups, we show, for the first time, that in LiFePO4-based cathode materials the electrode resistance depends solely on the mean particle size. The effect of carbon coating is marginal, it suffices that each LiFePO4 particle is point-contacted with a reasonable number of carbon black particles usually added in the course of electrode preparation. We present a simple but general theoretical model that consistently explains this unexpected result. The main reason for the relatively small importance of carbon coatings is the fact that the ionic conductivity (ca. 10(-11)-10(-10) S cm(-1) at RT) is much smaller than the electronic (>10(-9) S cm(-1) at RT). The present finding could be of significant importance not only for further optimization of LiFePO4 cathodes, but also for preparation of other cathode materials in which the ionic conductivity is much lower than the electronic. (C) 2007 Elsevier B.V. All rights reserved.
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