Recently scientists at SAIT released a paper on a new silicon anode with graphene, which when paired with a commercial cathode (LiCoO2), gave them volumetric energy density of 972 and 700 Wh L−1 at first and still at the 200th cycle. On the gravimetric densities they achieved 242.0 and 169.6 Wh kg−1.

The volumetric energy density, which corresponds to the size of the pack, is very high. According to the article, 1.8 and 1.5 times higher than those of current commercial lithium-ion cells (graphite//LiCoO2).

"Silicon is receiving discernable attention as an active material for next generation lithium-ion battery anodes because of its unparalleled gravimetric capacity. However, the large volume change of silicon over charge–discharge cycles weakens its competitiveness in the volumetric energy density and cycle life. Here we report direct graphene growth over silicon nanoparticles without silicon carbide formation.