P2-Type Na0.67Ni0.33Mn0.55Ti0.12O2 (NNMTO) Coated Aluminum Foil as Cathode Electrode (Disc, Sheet) for Na-Ion Battery, CSIBCENNMTO
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Sodium Nickel Manganese Titanium Oxide (NNMTO), typically crystallized in the P2-type layered structure, is one of the most promising cathode materials for high-voltage sodium-ion batteries (SIBs). It evolved directly from the classic Na0.67Ni0.33Mn0.67O2 baseline to solve the severe structural degradation that occurs at high operating voltages.
In the pristine Na0.67Ni0.33Mn0.67O2 matrix, charging the battery above 4.0 V (vs. Na/Na+) extracts a large amount of Na+ ions. This triggers a highly destructive P2 to "O2" (or OP4) phase transition, causing the layers to glide, the crystal lattice to abruptly contract, and the cycle life to plummet. Replacing a portion of the Mn^{4+} with Ti^{4+} alters the chemistry in three profound ways: (1) Suppression of Phase Transitions: Ti^{4+} (0.605 Å) has a larger ionic radius than Mn^{4+} (0.53 Å). The strong Ti-O covalent bonds act as "atomic pillars" that lock the transition metal layers in place, completely suppressing or smoothing out the detrimental P2-O2 phase glide at high voltages. (2) Expanded Diffusion Channels: The larger size of the Ti^{4+} ion physically widens the interlayer spacing (d-spacing), facilitating smoother and faster Na+ insertion and extraction. (3) Mitigation of Jahn-Teller Distortion: Titanium helps ensure that manganese remains strictly in its stable Mn^{4+} valence state, avoiding the formation of Mn^{3+}, which induces severe asymmetric lattice distortion and subsequent manganese dissolution into the electrolyte.
P2-type Na0.67Ni0.33Mn0.55Ti0.12O2 (NNMTO) 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 | CSIBCENNMTO (C-SIB-CE-NNMTO) |
| Current collector | 15 um aluminum foil |
| Coating Material | Na0.67Ni0.33Mn0.55Ti0.12O2 (NNMTO) 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 |
~115.2 mAh/g (0.1 C, testing voltage range of 2.5-4.25 V) Electrolyte:1.0M NaPF6 in EC:DMC:EMC=1:1:1 Vol% with 1.0%FEC) |
| First Columbic Efficiency | 95.36 % |
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:
- S. An, et al. Titanium Substitution to Advance the Prospect of NaMnO2 Cathodes for Practical Application in Sodium-Ion Batteries, ACS Appl. Energy Mater. 2025, 8, 14, 10508–10518
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K. Tang, et al. Electrochemical performance and structural stability of air-stable Na0.67Ni0.33Mn0.67-xTixO2 cathode materials for high-performance sodium-ion batteries, Chemical Engineering Journal, 2020, 399, 125725
