A new electrolyte mixture improved the thermal behaviour of laboratory lithium batteries while maintaining high-voltage cycling. In one-ampere-hour pouch cells, thermal runaway began 87 degrees Celsius higher than with a baseline electrolyte. The peer-reviewed study combines flame resistance with protective chemistry at both electrodes; runaway remained possible in the full cells.
A peer-reviewed battery experiment delayed the onset of thermal runaway, the self-accelerating release of heat inside a cell. One-ampere-hour graphite pouch cells containing a sulfamoyl–carbonate hybrid electrolyte reached that point 87 degrees Celsius higher than cells with the baseline liquid. Calorimetry also showed heat release spread across a broader temperature range. Runaway remained possible in the tested full cells.[1]
The mixture dissolves lithium hexafluorophosphate in dimethylsulfamoyl fluoride and two carbonate solvents. Its proportions were chosen to balance flame resistance, ion movement and compatibility with electrodes. In the separate ignition experiment, the selected formulation’s self-extinguishing time was approximately zero. The liquid’s combustion test and the charged cell’s thermal response measure different parts of battery safety.[1]
Surface spectroscopy, mass spectrometry and electron microscopy examined protective layers at both electrodes. The authors associate the sulfamoyl component with protection of the positive electrode and fluoroethylene carbonate with early passivation of graphite. At a 4.5-volt upper cutoff, lithium-metal cells retained 90.6 per cent of capacity after one hundred cycles, against 82.1 per cent with the comparison formulation. Those cycling results apply to the specified laboratory cell designs.[1]
