Na4Fe3(PO4)2P2O7 (NFPP432) Dry Electrode (Disc, Sheet) with High Loading (31-62 mg/cm2) for Na-Ion Battery, CSIBDEHLNFPP432
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Developing high-loading Na₄Fe₃(PO₄)₂P₂O₇ (NFPP432) dry electrodes is a significant step toward making sodium-ion batteries (SIBs) commercially competitive, particularly for long-cycle life and safety-critical applications. NFPP is an ideal candidate for dry processing due to its structural stability.
NFPP is a "polyanion" material with a 3D framework that allows fast sodium-ion diffusion. However: (1) Electronic Conductivity: Like most phosphates, NFPP is an insulator. High loading increases the electron path length, necessitating a robust conductive network. (2) Particle Morphology: NFPP particles are often micron-sized clusters. For dry electrodes, the particle size distribution must be optimized to ensure even distribution within the PTFE (polytetrafluoroethylene) fibril matrix.
Na₄Fe₃(PO₄)₂P₂O₇ (NFPP) coated on aluminum foil electrode (disc, sheet) can be used as sodium-ion battery cathode. The round disc shape with single-side coating is suitable for coin cell testing, while the rectangle sheet shape with single- or double-side coating is designed for single-layer or multiple-layer pouch cell testing.
| Part Number | CSIBDEHLNFPP (C-SIB-DEHL-NFPP) |
| Current collector | 15 um aluminum foil with carbon coating (1 um on each side) |
| Dry Coating Material | Na4Fe3(PO4)2P2O7 (NFPP432) powder |
| Active Portion | 94.5% |
| Electrode Features |
(1) Round disc shape: D = 10 -15 mm (2) Rectangle sheet shape: (a) 31 mg/cm2, single-side, 1.93 g/cm3, L120 mm*W90 mm (b) 62 mg/cm2, double-side, 2.3 g/cm3, L120 mm*W90 mm |
| Package Size |
Round disk D=10-15 mm (50 pcs/pack) Rectangle sheet with SS & DS coating (5 pcs/pack) |
| First Discharging Capacity |
~105 mAh/g (0.1 C, testing voltage range of1.5-3.5 V, Electrolyte:1.0M NaPF6 in EC:DMC:EMC=1:1:1 Vol% with 1.0%FEC) |
| First Columbic Efficiency | 94.8 % |
Notes: (1) Please store the NFPP432 electrodes in a dry area (glovebox is preferred); (2) The battery electrodes are highly recommended to be dried at 80-100°C in a vacuum oven for 6-12 h before use.
References:
- H. Yang, et al. Phase Regulation Promotes High Rate-Long Term Na4Fe3(PO4)2P2O7 Cathode for Sodium-Ion Batteries, Battery & SuperCaps, 2024, 7, e202400438.
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P. Zhu, et al. Promises and Challenges of Na4Fe3(PO4)2(P2O7) Cathode for Electric Vehicles and Energy Storage From an Industrial Perspective, Small, 2026, 22, e14884.
