NFPP Anode-Free Dry Pouch Cell(Multiple Specs)

Name: NFPP Anode-Free Sodium-Ion Pouch Dry Cell (Multiple Specs)

Cell Type: NFPP-Anode-Free Pouch Dry Cell

Product Code: XN-NFPP-AF

Description:

NFPP Anode-Free Sodium-Ion Pouch Dry Cell pairs sodium ferric pyrophosphate (Na₄Fe₃(PO₄)₂P₂O₇) cathode with a carbon-coated aluminum foil current collector — no anode active material — in a fully assembled but unfilled (dry) pouch format. As a result, this configuration represents the most aggressive energy-density architecture in sodium-ion chemistry, combined with the inherent safety and long cycle life of the NFPP polyanionic framework. During the first charge, sodium ions plate directly from the NFPP cathode onto the carbon-coated aluminum surface, eliminating the volume and weight overhead of conventional hard carbon anodes. Note that, unlike lithium-ion anode-free cells which use bare copper, sodium-ion anode-free systems require aluminum foil with a thin carbon coating — copper is incompatible with sodium (Cu–Na alloy formation), and the carbon coating is essential to improve sodium nucleation and reduce first-cycle losses. Furthermore, the dry (unfilled) pouch format allows customers to inject their own electrolyte formulations, making this cell ideal for advanced anode-free sodium-ion electrolyte and plating interface research.

Application:

This dry pouch cell serves as a research platform for anode-free sodium-ion battery development, including sodium-ion electrolyte formulation studies for low-voltage sodium plating, plating/stripping interface research on carbon-coated aluminum, advanced electrolyte additive screening for dendrite suppression and high coulombic efficiency, full-cell prototyping for stationary energy storage, grid-scale storage, and low-cost mobility applications, and academic studies of anode-free sodium-ion degradation mechanisms (sodium dendrite morphology, dead sodium accumulation) under NFPP’s safer, lower-voltage chemistry.

Cell Specifications (1 Ah Standard Grade):

Cathode Specifications (NFPP):

Current Collector Specifications (Anode-Free):

Values measured by Xnergy. Typical values for reference; not guaranteed unless otherwise specified.

Available Capacity Grades:

Characteristics:

NFPP + anode-free: maximum safety meets maximum energy density in sodium-ion

The combination of NFPP (one of the safest sodium-ion cathodes due to strong P–O bonds in the polyanionic framework) with anode-free architecture (the highest theoretical energy density configuration) creates a uniquely valuable research platform. As a result, this cell is well-suited for next-generation stationary storage applications where both safety and energy density are critical design drivers — and where sodium-ion’s low-cost, lithium-free supply chain provides a strategic advantage over lithium-ion equivalents.

Carbon-coated aluminum: the sodium-compatible current collector

Unlike lithium-ion anode-free systems that use bare copper, sodium-ion anode-free cells must use aluminum foil — copper alloys with sodium and cannot serve as a current collector. Furthermore, a thin conductive carbon coating on the aluminum surface improves sodium nucleation, lowers nucleation overpotential, reduces first-cycle losses, and stabilizes the plating/stripping interface. Therefore, this cell uses carbon-coated aluminum foil as the standard anode-free current collector — a critical materials choice unique to sodium-ion anode-free chemistry.

In-situ sodium plating from NFPP cathode

During the first charge, sodium ions migrate from the NFPP cathode and plate directly onto the carbon-coated aluminum surface, forming the sodium metal anode in-situ. Therefore, customers can study sodium plating morphology under NFPP’s lower-voltage operating window (3.4 V cutoff) — a regime where dendrite suppression and SEI stability differ fundamentally from layered oxide sodium-ion anode-free chemistry.

Dry (unfilled) pouch design for sodium-ion electrolyte studies

The cell ships fully assembled but without electrolyte. Therefore, customers can inject their own sodium-ion electrolyte formulations to study electrolyte effects on sodium plating efficiency at low voltage, SEI stability, and dendrite suppression — the core challenges of anode-free sodium-ion chemistry that are most strongly influenced by electrolyte design and additive selection.

Aging under stack pressure for sodium plating uniformity

The recommended aging protocol applies 8 kgf/cm² stack pressure at 45 °C for 24 h. Consequently, this controlled pressure environment promotes uniform sodium plating during formation, suppresses dendrite formation, and improves cycling stability — a critical practice for anode-free sodium-ion systems.

Standardized stacked pouch architecture

Stacked-electrode (laminated) construction with PE 9+3 composite separator. Therefore, results are reproducible across labs and comparable with industry benchmarks for anode-free sodium-ion cells.

Multiple capacity grades + single-layer option

Standard 1 Ah and 2 Ah multi-layer grades support full-cell research. Furthermore, the Single-Layer option provides a simplified platform for fundamental anode-free studies — ideal for SEI characterization on carbon-coated aluminum, sodium plating morphology imaging, and one-electrode interface research.

Recommended Activation Protocol:

1. Inject sodium-ion electrolyte at 4–5 g/Ah ratio. 2. Vacuum-seal the pouch under inert atmosphere. 3. Aging: hold at 45 °C for 24 h under 8 kgf/cm² stack pressure (sodium begins plating uniformly across the carbon-coated aluminum surface during formation). 4. Pre-formation rest: 12 h. 5. Formation: charge at 0.1C constant current to 3.4 V (1 cycle, full sodium loading). 6. Final aging: hold at room temperature for 24 h before subsequent cycling tests.

Packaging & Storage:

Cells ship vacuum-sealed under inert atmosphere in moisture-barrier packaging. Therefore, customers should store sealed in a cool, dry environment (15–25 °C, RH < 30 %), protected from moisture and direct sunlight. Open packaging in a dry-room or glovebox environment immediately before electrolyte filling. Note that no sodium metal is present in the cell as shipped — anode-free cells in their pre-formation state are significantly less hazardous than pre-deposited sodium-metal cells, but standard sodium-ion cell handling applies once electrolyte is added and formation begins.

Safety:

For research and industrial use only. Once electrolyte is added and formation initiated, sodium metal is plated onto the carbon-coated aluminum surface — at this point the cell becomes a sodium-metal battery and must be handled accordingly. Activated cells contain flammable electrolyte and reactive sodium metal; handle in glovebox or dry-room conditions during electrolyte filling and formation. Wear full PPE. Never short-circuit, overcharge, overdischarge, puncture, or expose cells to high temperatures (> 60 °C). Compared to layered oxide sodium-ion anode-free systems, NFPP anode-free cells benefit from inherently safer cathode chemistry due to the strong P–O bonds in the polyanionic framework — but post-formation handling requires the same sodium-metal protocols. Refer to SDS for complete safety information.

Note: Values listed above are typical and for reference only. Performance may vary depending on electrolyte choice, formation protocol, applied stack pressure, cycling conditions, and test environment. Anode-free sodium-ion chemistry is highly sensitive to electrolyte design and current collector surface treatment — consult published literature for guidance on electrolyte formulations targeting high coulombic efficiency on carbon-coated aluminum. See also other dry pouch cells in our catalog: NFPP Polyanionic / Hard Carbon, NVP / Hard Carbon, NVP Anode-Free, P2 Layered Oxide, Sodium Metal Single-Layer Pouch, LFP Anode-Free, LFP / Artificial Graphite, LFP / Lithium Metal, NCM811 Anode-Free, NCM811 / Artificial Graphite, and LMFP / Artificial Graphite. Browse the full Dry Pouch Cell category for all configurations.