(Digital Presentation) A Zero-Dimensional Physics-Based Model for Lithium Carbon Monofluoride (Li/CFx) Batteries

• DOI: 10.1149/ma2022-011155mtgabs
• Publication Date: 2022-07-14T16:21:33Z
• Authors: Caitlin D. Parke; Kailot Harris; Paul Albertus
• Keywords: Overpotential; Specific energy

Lithium carbon monofluoride primary batteries have a high energy density (2180 Wh/kg of active materials based on the typical discharge potential) and low self-discharge. They traditionally been used in medical devices like pacemakers with rates several years [1]. The Li/CFx also make them attractive for higher rate uses aerospace or military applications; however, capability heat generation can pose significant challenge at rates. theoretical potential CFx battery is around 4.5 V, but practical cells operate 3 V lower. ~1.5 overpotential attributed to strength C-F bonds, which results slow kinetics generation, especially when considering (e.g., >C/10) dense cell designs. Other challenges include deposition insulating lithium fluoride large volume changes each electrode [2]. Our work focuses high-energy cathode anode, designed intermittent pulse power requirements. Physics-based modeling an important tool that clarify underlying mechanisms help guide design satisfy multiple constraints. To understand posed by this chemistry rates, we developed zero-dimensional (0D) physics-based model captures some complex phenomena within cathode. Included are described concentration-dependent expression, changing porosity electrochemical area, Nernstian thermodynamics. may treatment methods increase capabilities beyond limits chemistry. implications various conditions will be explored, such as effect loading. compared experimental data from coin cells. Acknowledgments authors would thank Intelligence Advanced Research Projects Agency funding work. References Zhang, K. J. Takeuchi, E. S. A. C. Marschilok, Phys. Chem. , 17 22504 (2015). D. Foster, Wolfenstine, Read, Power Sources 187 233 (2009).