scholarly journals Capacity Fade Analysis of Lithium-Ion Cells Utilizing Uncertainty Quantification Approach

2019 ◽  
Author(s):  
Vahid Esfahanian ◽  
Saeed Akbari ◽  
Farzin Chaychizadeh ◽  
Hojat Dehghandorost
Keyword(s):  
Voltage Drop ◽  
Low Cost ◽  
Solid Electrolyte Interphase ◽  
Lithium Ion ◽  
Stochastic Approach ◽  
Internal Resistance ◽  
Constant Current ◽  
Capacity Fade ◽  
Uncertainty Sources ◽  
Lithium Ion Cells

Lithium-ion batteries (LIBs) have drawn attention in research due to their broad range of applications. To achieve low-cost and high reliable batteries, researchers have worked on a variety of degradation phenomena. Among them, the Solid Electrolyte Interphase (SEI) layer is the most important degradation phenomenon and causes the cell to capacity fade and internal resistance raise. In this paper, a stochastic approach, based on the sparse Jacobi polynomial chaos expansion, is utilized to investigate the effect of the uncertainty sources on the lithium-ion battery aging. Furthermore, the importance of every uncertainty source is calculated by using Sobol indices. Capacity fade and resistance raise obtain at the end of the Constant Current-Constant Voltage (CC-CV) charging. The outcome of this study shows the most important parameters affecting capacity fade and voltage drop.

Experimental Evaluation of the Effect of Cycle Profile on the Durability of Commercial Lithium Ion Power Cells

2018 ◽  
Vol 16 (1) ◽  
Author(s):  
K. N. Radhakrishnan ◽  
T. Coupar ◽  
D. J. Nelson ◽  
M. W. Ellis
Keyword(s):  
Lithium Ion ◽  
Critical Factor ◽  
Internal Resistance ◽  
Wave Profile ◽  
Total Charge ◽  
Capacity Fade ◽  
Square Wave ◽  
Lithium Ion Cells ◽  
Discharge Profile ◽  
Testing Protocols

The effect of the charge/discharge profile on battery durability is a critical factor for the application of batteries and for the design of appropriate battery testing protocols. In this work, commercial high-power prismatic lithium ion cells for hybrid electric vehicles (HEVs) were cycled using a pulse-heavy profile and a simple square-wave profile to investigate the effect of cycle profile on battery durability. The pulse-heavy profile was designed to simulate on-road conditions for a typical HEV, while the simplified square-wave profile was designed to have the same total charge throughput, but with lower peak currents. The 5 Ah batteries were cycled for 100 kAh with periodic performance tests to monitor the state of the batteries. Results indicate that, for the batteries tested, the capacity fade for the two profiles was very similar and was 11±0.5% compared to beginning of life (BOL). The change in internal resistance of the batteries during testing was also monitored and found to increase 21% and 12% compared to BOL for the pulse-heavy and square-wave profiles, respectively. The results suggest that simplified testing protocols using square-wave cycling may provide adequate insight into capacity fade behavior for more complex hybrid vehicle drive cycles.

Sign in / Sign up

Export Citation Format

Share Document