  In this work, we demonstrate that an impugn of energy density for sodium
chemistries can be prevail through an anode-free architecture enabled by the
use of a (nanocarbon/Cobaltoxide) nucleation layer formed on Aluminium current
collectors. Electrochemical studies show this configuration to provide highly
stable and efficient plating and stripping of sodium metal over a range of
currents up to 5 mA/cm2, sodium loading up to 14 mAh/cm2, and with long-term
endurance exceeding 1000 cycles at a current of 0.7 mA/cm2. Building upon this
anode-free architecture, we demonstrate a full cell using a presodiated pyrite
cathode to achieve energy densities of 400 Wh/kg, far surpassing recent reports
on SIBs and even the theoretical maximum for LIB technology while still relying
on naturally abundant raw materials and cost-effective aqueous processing.
