Abstract
Fundamental electrochemical studies require the implementation of a reference electrode inside the cell to record the potential profile and characterize the kinetic properties as well as the interface structure of each electrode [1]. Obtaining such data is essential for a better understanding of the electrochemical processes and the aging mechanisms generated by cycling. This is challenging for lithium-ion technologies for which no reference electrode is commercially available. LixFePO4 (LFP), a biphasic material, has been identified as a possible reference material, because its insertion/de-insertion curves show a voltage plateau over a wide lithiation range (Figure 1). Literature reports studies of instrumented pouch cells with a reference electrode in LFP [2, 3]. One important criterion to consider is the stability of the potential of LFP over time and the impact of temperature on the potential in the perspective to develop innovative smart-cell. The response will be provided according to the stability study of the Li0.5FePO4 potential. The methodology, used to evaluate the operating time of the reference electrode in LFP is based on monitoring the open circuit potential (OCV) of Li0.5FePO4 versus lithium over time and at different temperatures. The used cell configuration used is illustrated in Figure 2. We will also present the entropic behaviour of LFP which will confirm why LFP is a good candidate for reference electrode.REFERENCES:[1] Electroanalytical Methods Guide to Experiments and Applications, Springer; Edition: 2nd ed. 2010 (11 November 2014)[2] I. Jiménez Gordon, S. Grugeon, A. Débart, G. Pascaly, S. Laruelle, Solid State Ionics 237 (2013) 50–55[3] F. La Mantia, C.D. Wessells, H.D. Deshazer, Yi Cui, Electrochemistry Communications, Vol. 31,2013, 141-144ACKNOWLEDGMENTS:INSTABAT project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No 955930. Figure 1
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