The French SIMCAL Research Network For Modelling of Calendar Aging for Energy Storage System in EVs And HEVs - EIS Analysis on LFP/C Cells

• Published in: ECS transactions Vol. 45; no. 13; pp. 73 - 81
• Main Authors: Grolleau, Sebastien, Molina-Concha, Belen, Delaille, Arnaud, Revel, Renaud, Bernard, Julien, Pélissier, Serge, Peter, Jéremy
• Format: Journal Article
• Language: English
• Published: The Electrochemical Society, Inc 22.02.2013
• ISSN: 1938-5862; 1938-6737
• DOI: 10.1149/04513.0073ecst

Durability is of the first importance in Lithium-Ion batteries dedicated to electrical transportation. In this paper, commercial Lithium-Ion cells are stored under 3 different conditions of temperature (30{degree sign}C, 45{degree sign}C, and 60{degree sign}C) and state of charge (30%, 65%, and 100%) during up to 15 months. Capacity and Electrochemical Impedance Spectroscopy (EIS) measurements are performed periodically in order to follow and to understand calendar aging phenomena. Capacity fade strongly increases with storage temperature and to a lesser extent with the state of charge. EIS analyses do not show any evidence of change in mater transport properties. Conversely, this analysis supports the existence of side reactions taking place at the electrode/electrolyte interface leading to the growth of the solid electrolyte interphase.