Electrochemical analysis of li-ion cells containing triphenyl phosphate
Date of Original Version
The development and subsequent incorporation of flame retardant additives (FRAs) has become a priority for Li-Ion battery research and development. Triphenyl phosphate (TPP) was studied to ascertain the safety benefits and electrochemical performance when incorporated into a LiPF6/ethylene carbonate (EC)/ethyl methyl carbonate (EMC) electrolyte system. The flammability of electrolytes containing TPP was investigated via self-extinguishing time and flash point analysis. The electrochemical stability was studied by cyclic voltammetry (CV), battery cycling in graphite/LiNi0.8Co 0.2O2 cells, electrochemical impedance spectroscopy (EIS) and Tafel polarization. In order to better understand the role of TPP, ex-situ surface analysis of the cycled electrodes was conducted with X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). Incorporation of TPP results in a moderate decrease in the flammability of the electrolyte with relatively minor detrimental effects on the performance of the cells and thus is a promising additive for lithium ion batteries. © 2012 The Electrochemical Society.
Journal of the Electrochemical Society
Dunn, Ronald P., Janak Kafle, Frederick C. Krause, Constanza Hwang, Bugga V. Ratnakumar, Marshall C. Smart, and Brett L. Lucht. "Electrochemical analysis of li-ion cells containing triphenyl phosphate." Journal of the Electrochemical Society 159, 12 (2012). doi:10.1149/2.081212jes.