1. Modeling Battery Performance Due to Intercalation Driven Volume Change in Porous Electrodes
- Author
-
Garrick, Taylor R, Higa, Kenneth, Wu, Shao-Ling, Dai, Yiling, Huang, Xinyu, Srinivasan, Venkat, and Weidner, John W
- Subjects
Engineering ,Materials Engineering ,Chemical Sciences ,Physical Chemistry ,Macromolecular and Materials Chemistry ,Physical Chemistry (incl. Structural) ,Energy ,Physical chemistry ,Materials engineering - Abstract
Simulations are presented that result from incorporating dimensional and porosity changes in porous electrodes caused by volume changes in the active material during intercalation into a detailed lithium-ion battery model. Porosity and dimensional changes in an electrode can significantly affect the resistance of the battery during cycling, which in turn alters the reaction distributions in the porous electrodes. In addition, volume changes generate stresses in the electrode which can lead to premature failure of the battery. Here, material conservation equations are coupled with the mechanical properties of porous electrodes to link dimensional and porosity changes to stresses and the resulting resistances that occur during the intercalation processes. Through the use of porous rock mechanics, porosity and strain gradients can be predicted based on state of discharge and discharge rate. Several different battery casings and discharge rates are examined and operating curves are predicted.
- Published
- 2017