Lithium-ion pouch cells were cycled at five different temperatures (5, 15, 25, 35, and 45°C ), and rate capability studies were performed after every hundred cycles. The data were used with a simple physics-based model to estimate parameters that capture the capacity fade in the cell, with cycling. The weight of active material within each electrode was estimated as a function of time, using rate capability data at the C/33 rate. The C-rate for these cells is 1.656 A. The capacity fade due to the loss of active material and that due to the loss of cyclable lithium were quantified. It was found that while the loss of cyclable lithium is the limiting cause for the capacity decay of the cell during the first 200 cycles, the loss of active carbon, which is the anode material, becomes limiting for these cells. The loss of active material leads to a drastic decrease in cell capacity at higher temperatures.
Published in Journal of the Electrochemical Society, Volume 155, Issue 4, 2008, pages A345-A353.
© The Electrochemical Society, Inc. 2008. All rights reserved. Except as provided under U.S. copyright law, this work may not be reproduced, resold, distributed, or modified without the express permission of The Electrochemical Society (ECS). The archival version of this work was published in
Santhanagopalan, S., Zhang, Q., Kumaresan, K., & White, R.E. (2008). Parameter Estimation and Life Modeling of Lithium-Ion Cells. Journal of the Electrochemical Society, 155(4): A345-A353.
Publisher’s Version: http://dx.doi.org/10.1149/1.2839630