Thermal Behavior of Charged Graphite and Li[sub x]CoO[sub 2] in Electrolytes Containing Alkyl Phosphate for Lithium-Ion Cells
- 1 January 2009
- journal article
- Published by The Electrochemical Society in Journal of the Electrochemical Society
- Vol. 156 (3), A176-A180
- https://doi.org/10.1149/1.3056035
Abstract
The thermal behavior of charged graphite anode and LixCoO2LixCoO2 cathode was investigated focusing on nonflammable electrolytes containing alkyl phosphates as a flame retardant by differential scanning calorimetry. Trimethyl phosphate improved the thermal stability on the cathode side, while a violent exothermic reaction occurred on the anode side. It was demonstrated that the additive technique provides important improvements electrochemically and thermally even in a unique LiBF4∕γLiBF4∕γ -butyrolactone-based electrolyte containing a reductive phosphate solvent. The flame retardant concept of liquid electrolytes is intrinsically ineffective inside a cell, because the excellent flame retardant, tris(2,2,2-trifluoroethyl) phosphate did not make the anode and cathode more thermally stable.Keywords
This publication has 29 references indexed in Scilit:
- High-Concentration Trimethyl Phosphate-Based Nonflammable Electrolytes with Improved Charge–Discharge Performance of a Graphite Anode for Lithium-Ion CellsJournal of the Electrochemical Society, 2006
- Thermal Behavior of a C∕LiCoO[sub 2] Cell, Its Components, and Their Combinations and the Effects of Electrolyte AdditivesJournal of the Electrochemical Society, 2006
- Comparative study of trimethyl phosphite and trimethyl phosphate as electrolyte additives in lithium ion batteriesJournal of Power Sources, 2005
- 4-Isopropyl Phenyl Diphenyl Phosphate as Flame-Retardant Additive for Lithium-Ion Battery ElectrolyteElectrochemical and Solid-State Letters, 2005
- Evaluation of Fluorinated Alkyl Phosphates as Flame Retardants in Electrolytes for Li-Ion Batteries: II. Performance in CellJournal of the Electrochemical Society, 2003
- Evaluation of Fluorinated Alkyl Phosphates as Flame Retardants in Electrolytes for Li-Ion Batteries: I. Physical and Electrochemical PropertiesJournal of the Electrochemical Society, 2003
- An Attempt to Formulate Nonflammable Lithium Ion Electrolytes with Alkyl Phosphates and PhosphazenesJournal of the Electrochemical Society, 2002
- Nonflammable Electrolytes for Li-Ion Batteries Based on a Fluorinated PhosphateJournal of the Electrochemical Society, 2002
- Nonflammable Trimethyl Phosphate Solvent-Containing Electrolytes for Lithium-Ion Batteries: II. The Use of an Amorphous Carbon AnodeJournal of the Electrochemical Society, 2001
- Nonflammable Trimethyl Phosphate Solvent-Containing Electrolytes for Lithium-Ion Batteries: I. Fundamental PropertiesJournal of the Electrochemical Society, 2001