Note that 460 Wh/kg is the density of the electrode, not the cell as a whole which given the aqueous electrolyte would be less but still higher than existing te

Note that 460 Wh/kg is the density of the electrode, not the cell as a whole which given the aqueous electrolyte would be less but still higher than existing technologies. However, the key point is not just the density, but the density combined with the materials used, and (perhaps most importantly) safety. I think it's worth comparing to LiFePO4 as a baseline. It has the lowest density of common li-ion batteries (110Wh/kg), but it is very safe as it does not have the likelihood of thermal runaway. Other battery types have higher densities, like li-poly and other li-ions, but they can have thermal runaway if damaged or overcharged requiring battery management systems to prevent fire. (With LiFePO4, you also need a BMS, but mainly to prevent permanent damage to the battery to protect your investment, rather than fire.) From my understanding, if this can be commercially viable (as it should be with the lower material cost), this will achieve high density, low cost, and thermal safety, which puts it in a league of its own.