Modeling Lithium-ion Capacity Fade by Lithium Plating and Set Formation
Author | : |
Publisher | : |
Total Pages | : 0 |
Release | : 2020 |
ISBN-10 | : OCLC:1335765680 |
ISBN-13 | : |
Rating | : 4/5 (80 Downloads) |
Book excerpt: Capacity fade models effectively study the aging behavior of a battery cell after long term cycling, and allow for better understanding of the theory of degradation, thereby slowing down the capacity fade rate and improving battery safety issues. Solid electrolyte interface (SEI) growth and lithium plating are two key reasons why capacity fade occurs. In this study, a physics-based lithium-ion cell model including capacity fade and thermal effects is developed and used to predict the cell cycle life under different operating conditions. The model is validated using the experimental data. Under low temperatures or high C-rates, lithium plating seems to be the dominating factor of cell capacity fade; under high temperatures or low C-rates, the SEI film is the dominating factor of cell capacity fade. As evidenced by this study, the cell capacity fade is more sensitive to the operating temperature than the charging rate under the normal operating and charging conditions. 1 C and 25 °C is found to be the optimal operating condition. The thermal analysis results show that the cell temperature increases with cycle number, which is attributed to the high ohmic losses from the resistance of anode. The model presented in this research will be useful for charging strategy design in order to minimize the lithium plating and provide insight for the cell thermal management.