P2-Type Na2/3Ni1/3Mn2/3O2 (NNMO) Coated Aluminum Foil as Cathode Electrode (Disc, Sheet) for Na-Ion Battery, CSIBCENNMO
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Using P2-type Na₂/3Ni₁/3Mn₂/3O2 (NNMO) coated on aluminum foil represents a move toward the high-voltage frontier of sodium-ion batteries (SIBs). While the O3-type (like NNFMO) typically offers higher initial sodium content, the P2-type NNMO is favored for its superior sodium-ion diffusion kinetics and structural stability at higher rates.
Compared to the polyanion NFPP or the layered O3-type materials, P2-NNMO offers a unique set of characteristics: (1) Faster Kinetics: The P2 structure has larger interstitial sites, allowing Na+ ions to move more freely than in the O3 structure. (2) Voltage Profile: It typically operates in a higher voltage window (up to 4.2-}4.5V), though it is often capped at 4.2V to avoid the P2-O2 phase transition which can cause structural collapse. (3) Air Stability: While still sensitive, P2-type oxides are generally more stable against moisture and CO2 than O3-type oxides, making the coating process slightly more forgiving.
P2-type Na₂/3Ni₁/3Mn₂/3O2 (NNMO) 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 | CSIBCENNMO (C-SIB-CE-NNMO) |
| Current collector | 15 um aluminum foil |
| Coating Material | Na2/3Ni1/3Mn2/3O2 (NNMO) powder |
| Active Material Portion | 93.5% |
| Electrode Features |
(1) Round disc shape: D = 10 -15 mm (other diameter discs are also available). (2) Rectangle sheet size: (a) L150mm*W110mm, Single-Side, 13.5 mg/cm2, 2.08 g/cm3 (b) L150mm*W110mm, Double-Side, 27.0 mg/cm2, 2.30 g/cm3 |
| Package Size |
Round disk D=10-15 mm (50 pcs/pack) Rectangle sheet with SS & DS coating (5 pcs/pack) |
| First Discharging Specific Capacity |
~118 mAh/g (0.1 C, testing voltage range of 2.0-4.25 V, Electrolyte:1.0M NaPF6 in EC:DMC:EMC=1:1:1 Vol% with 1.0%FEC) |
| First Columbic Efficiency | 95.0 % |
Notes: (1) Please store the NNMO 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:
- T. Jing, et al. Realizing Complete Solid-Solution Reaction in High Sodium Content P2-Type Cathode for High-Performance Sodium-Ion Batteries, Angew. Chem. Int. Ed., 2020, 59, 14511-14516.
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M. Jiang, et al. Revisiting the capacity-fading mechanism of P2-type sodium layered oxide cathode materials during high-voltage cycling, J. Energy Chem., 2022, 69, 16-25.
