Forging Inspired Processing of Sodium‐Fluorinated Graphene Composite as Dendrite‐Free Anode for Long‐Life Na–CO₂ Cells

Na–CO2 batteries recently are emerging as promising energy-storage devices due to the abundance of Na in earth's crust and clean utilization greenhouse gas CO2. However, similar metallic Li, also suffers from a serious issue dendrite growth upon repeated cycling, while facile method solve this is still lacking. In work, we report an effective, environmentally friendly inhibit by situ constructing stable, NaF-rich solid electrolyte interface (SEI) layer on via adding small amount (~3 wt%) fluorinated graphene (FG) bulk Na. Inspired forging processing, uniform Na/FG composite was obtained melting repetitive FG-adsorbing/hammering processes. The Na/FG–Na/FG half cell exhibits low voltage hysteresis 110–140 mV over 700 h at current density up 5 mA cm−2 with areal capacity high mAh cm−2. full anode able sustain stable cycling 391 cycles limited 1000 g−1. Long cycle life can be attributed protecting effect fabricated SEI Both experiments functional theory (DFT) calculations confirm formation layer. inhibition for dendrites verified optical microscopy observations.