THE EFFECT OF MILD OXIDATION OF NATURAL GRAPHITE (NG7) ON THE SAFETY OF THE LITHIUM-ION BATTERY

摘要

The effect of mild oxidation of natural graphite (NG7) and some other parameters on the safety of the Li-Ion battery was studied by differential scanning calorimetry. It was found that mild oxidation stabilized the exothermic reaction of the lithiated graphite with the electrolyte, most likely as a result of the formation of a stable chemically bonded SEI (CB-SEI). Modification of the graphite suppressed this reaction further. It was also found that the Copper current collector, the amount of electrolyte and some other parameters have a significant influence on the DSC traces which are relevant to the safety of the Li-Ion battery.