TY - JOUR
T1 - Effect of tab design on large-format Li-ion cell performance
AU - Zhao, Wei
AU - Luo, Gang
AU - Wang, Chao Yang
N1 - Funding Information:
Partial support of this work by DOE CAEBAT Program is greatly acknowledged. We are grateful to EC Power for offering numerical algorithms and materials database through its AutoLion software and to Dr. Christian E. Shaffer for useful discussions.
PY - 2014/7/1
Y1 - 2014/7/1
N2 - Large-format Li-ion batteries are essential for vehicle and grid energy storage. Today, scale-up of Li-ion cells has not maximized the potential of available battery materials, leading to much lower energy density than their coin cell benchmarks. In this work, a 3D computational methodology based on physical and electrochemical principles underlying Li-ion cells is developed for the design of large cells. We show a significant increase in the cell's usable energy density by minimizing voltage losses and maximizing the utilization of active materials in a large cell. Specifically, a class of designs using multiple current-collecting tabs are presented to minimize in-plane electron transport losses through long electrodes, thereby achieving nearly the same energy density in large-capacity cells as would be expected from battery materials used. We also develop a quantitative relation between the current density non-uniformity in a large-format cell and the cell's usable energy density, for the first time, in the literature.
AB - Large-format Li-ion batteries are essential for vehicle and grid energy storage. Today, scale-up of Li-ion cells has not maximized the potential of available battery materials, leading to much lower energy density than their coin cell benchmarks. In this work, a 3D computational methodology based on physical and electrochemical principles underlying Li-ion cells is developed for the design of large cells. We show a significant increase in the cell's usable energy density by minimizing voltage losses and maximizing the utilization of active materials in a large cell. Specifically, a class of designs using multiple current-collecting tabs are presented to minimize in-plane electron transport losses through long electrodes, thereby achieving nearly the same energy density in large-capacity cells as would be expected from battery materials used. We also develop a quantitative relation between the current density non-uniformity in a large-format cell and the cell's usable energy density, for the first time, in the literature.
UR - http://www.scopus.com/inward/record.url?scp=84894340677&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84894340677&partnerID=8YFLogxK
U2 - 10.1016/j.jpowsour.2013.12.146
DO - 10.1016/j.jpowsour.2013.12.146
M3 - Article
AN - SCOPUS:84894340677
SN - 0378-7753
VL - 257
SP - 70
EP - 79
JO - Journal of Power Sources
JF - Journal of Power Sources
ER -