Degradation Studies on Lithium Iron Phosphate - Graphite Cells. The Effect of Dissimilar Charging – Discharging Temperatures

This work presents a systematic evaluation of the effect of dissimilar charging / discharging temperatures on the long-term performance of lithium iron phosphate / graphite based cells by using multi-factor analysis of variance. Specifically, the degradation of prototype pouch cells is presented in a range of charging and discharging temperatures from -20 °C to +30 °C, counting a total of 10 temperature combinations. In this manner, not only the effect of charging and discharging temperatures was analyzed, but also the correlations between them. Fitting of the data showed a quadratic relationship of degradation rate with charging temperature, a linear relationship with discharging temperature and a correlation between charging and discharging temperature. Cycling at the charge/discharge temperatures (+30 °C, -5 °C) produced the highest degradation rate, whereas cycling in the range from -20 °C to +15 °C, in various charge/discharge temperature combinations, created almost no degradation. It was also found that when Tc is approximately 15 °C the degradation rate is independent of Td. Below Tc < +15 °C, the higher degradation occurs at higher Td and at Tc > +15 °C lower degradation occurs at higher Td.

RUIZ RUIZ Vanesa;  KRISTON Akos;  ADANOUJ Ibtissam;  DESTRO M.;  FONTANA D.;  PFRANG Andreas; 

2017-05-18

PERGAMON-ELSEVIER SCIENCE LTD

JRC104979

0013-4686,   

http://www.sciencedirect.com/science/article/pii/S0013468617306060,    https://publications.jrc.ec.europa.eu/repository/handle/JRC104979,   

10.1016/j.electacta.2017.03.126,