Journal
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 163, Issue 14, Pages A3016-A3021Publisher
ELECTROCHEMICAL SOC INC
DOI: 10.1149/2.0821614jes
Keywords
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Funding
- China Scholarship Committee (CSC)
- European Union ECSEL 3Ccar project
- Science and Technology Office, Fujian Province [2014HZ0002-1]
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C-6/LiFePO4 (LFP) batteries have been cycled at various temperatures (20 and 60 degrees C) and State-of-Charge (SoC) ranges (0-30, 35-65, 70-100% and 0-100%). Electromotive force (emf) curves have regularly been determined by regression extrapolation of the measured voltage discharge curves. A non-destructive approach to quantitatively determine the graphite electrode decay has been proposed on the basis of dV(EMF)/d(Q) curves. It is concluded that the graphite inaccessibility is more pronounced at lower SoC (0-30%) than at higher SoC. The graphite electrode decay at 35-65%, 70-100% and 0-100% is identified to be negligible at moderated temperatures but becomes significant at elevated temperatures. The graphite electrode degradation has been confirmed by XPS and Raman spectroscopy, supporting the conclusions drawn from the dV(EMF)/d(Q) results. A model is proposed to explain the various graphite degradation mechanisms. (C) 2016 The Electrochemical Society. All rights reserved.
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