Electrochemical analysis of li-ion cells containing triphenyl phosphate
Document Type
Article
Date of Original Version
12-1-2012
Abstract
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.
Publication Title, e.g., Journal
Journal of the Electrochemical Society
Volume
159
Issue
12
Citation/Publisher Attribution
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.