Dry Anode-Free Pouch Cells with NFPP + Al/C for Sodium-Ion Battery, 1 Ah/pcs/pack, CSIBAFDPCNFPPA

The Dry Anode-Free Pouch Cell using Na2FeP2O7 (NFPP) and a carbon-coated Al represents the pinnacle of energy density and structural simplicity for Sodium-Ion Batteries (SIBs). By eliminating the Hard Carbon anode entirely, you remove a significant portion of the cell's weight and volume, aiming for a "lithium-free" equivalent to the most advanced anode-free lithium-metal batteries. In this architecture, the NFPP acts as the sole source of sodium. During the first charge, sodium ions strip from the NFPP crystal lattice and plate directly onto the carbon-coated aluminum current collector as Sodium Metal.

While Copper (Cu) is the standard for anode-free Lithium cells, Aluminum (Al) is a game-changer for Sodium-ion research: (1) Cost & Weight: Aluminum is significantly lighter and cheaper than copper. (2) Oxidation Resistance: Unlike copper, aluminum is stable at the lower potentials required for sodium plating. (3) Role of Carbon (C): Bare aluminum has a native oxide layer (Al2O3) that is poorly conductive and "sodiophobic." The Carbon coating (often applied via your Slot-Die or Roll-to-Roll Coater) provides a conductive, high-surface-area interface that promotes a dense, "dendrite-free" sodium morphology.

Testing Processes:

(1) Electrolyte Filling with recommended amount in glovebox.
(2) First Time Aging: 45°C, aging time ≥ 15h in an oven.
(3) Formation conditions: 45°C, 5 min rest; 0.02C constant current charging (10% theoretical capacity or 5 h); 0.1C constant current charging (30% theoretical capacity, 3 h); 5 min rest; total capacity is 40% or 8 h;
(4) Second Time Aging: 45°C, aging time ≥ 24h in a oven
(5) Battery Analyzer for charging and discharging.

References:

1. Y. Jin, et al., Low-solvation electrolytes for high-voltage sodium-ion batteries, Nat. Energy, 2022, 7, 718–725. 
2. B. Liu, et al., Super-wetting interface engineering of space-confined micron-sized alloying anodes for high-performance sodium-based dual-ion batteries, Matter, 2025, 8, 102294.