battery gravimetric energy density

Technical Paper:

Table 1: Comparative Energy Densities for Battery Chemistries

	Volumetric Energy Density (Wh/l)	Gravimmetric Energy Density (Wh/kg)
LMP Li-Ion	250	120
NiMH	170	70
VRLA	64	27
NiCd	75	50

Discharge profiles for LMP show a flat voltage plateau regardless of rate or temperature. Unlike PbA, LMP will deliver nearly all of its capacity at relatively high discharge rates. Discharge profiles for an energy optimized LMP cell (IFR18650) are shown in Figure 1. The flat operating voltage profile is clearly evident, as is the excellent capacity retention at rate. For example, greater than 90% of the cell's capacity can be delivered at a 2C (1/2 hour) rate.