BN-O3A O3 Type Sodium Ion Battery Positive Electrode Material
Na:20.6 ± 0.3%
Ni: 17.6 ± 0.3%
Fe:16.7 ± 0.3%
Mn:16.5 ± 0.3%
D10: 7.0 ± 0.5um
D50: 9.2 ± 0.5um
D90: 11.5 ± 0.5um
Tap density: ≥1.9g/cm³
MOQ: 10g
Leading time: 5-7days
Sodium Nickel Iron Manganese Oxide BN-O3A O3 Type Sodium Ion Battery Positive Electrode Material
Overview
O3-type NaNiFeMnO₂ (BN-O3A) is a layered transition metal oxide cathode material for sodium-ion batteries, with the general formula NaNiₓFeᵧMn₁₋ₓ₋ᵧO₂. It is characterized by its high theoretical capacity (~140 mAh/g at 0.1C), cost-effectiveness (abundant Fe/Mn resources), and structural stability. The “O3” denotes a trigonal prismatic coordination of Na⁺ ions, enabling high Na⁺ content but suffering from irreversible phase transitions during cycling.
Key Features
- Composition & Structure:
- Typical stoichiometry includes NaNi₁/₃Fe₁/₃Mn₁/₃O₂ (111-type) or variants like NaNi₀.₄Fe₀.₂Mn₀.₄O₂.
- Transition metals (Ni, Fe, Mn) synergize: Ni boosts capacity, Mn stabilizes structure, and Fe balances cost/performance.
- Challenges:
- Irreversible phase transitions (>4.0V) lead to structural degradation.
- Air sensitivity: Reacts with moisture, forming electrochemically inactive NaOH/Na₂CO₃.
- Jahn-Teller distortion from Mn³⁺ and Ni⁴⁺-electrolyte side reactions.
- Performance Optimization:
- Doping (e.g., Ti, Mg, Cu): Stabilizes structure, suppresses phase transitions, and enhances Na⁺ diffusion.
- Surface coating (e.g., Al₂O₃, NaTi₂(PO₄)₃): Mitigates electrolyte corrosion and improves cyclability.
- Morphology control: Spherical secondary particles (4–10 μm) with nano-sized primary grains enhance kinetics.
Applications & Prospects
BN-O3A is a promising candidate for large-scale energy storage (e.g., grid storage, EVs) due to its low cost and compatibility with existing Li-ion battery manufacturing. Recent advances in high-entropy doping and P/O hybrid phases aim to further improve energy density (>420 Wh/kg) and cycle life (>500 cycles at 1C)
Specifications
| Item | Unit | Specification | Value | Reference Standard | Test Equipment Model |
|---|---|---|---|---|---|
| Na | wt% | 20.6 ± 0.3 | 20.7 | GB/T 27598-2011 | Agilent 5800 |
| Ni | wt% | 17.6 ± 0.3 | 17.6 | GB/T 27598-2011 | – |
| Fe | wt% | 16.7 ± 0.3 | 16.7 | – | – |
| Mn | wt% | 16.5 ± 0.3 | 16.5 | – | – |
| D10 | μm | 7.0 ± 0.5 | 7.9 | GB/T 19077-2016 | – |
| D50 | μm | 9.2 ± 0.5 | 9.7 | GB/T 19077-2016 | Beckman Coulter LS 13320 |
| D90 | μm | 11.5 ± 0.5 | 11.8 | GB/T 5162-202X | – |
| Tap density | g/cm³ | ≥1.9 | 2.0 | – | Tap Density Testing Instrument |
| SSA (BET) | m²/g | ≤2.0 | 0.5 | GB/T 19587-2004 | – |
| 2TFPD | g/cm³ | – | – | GB/T 24533-2019 | MYCRO Carver 4350 |
| 0.1C Capacity | mAh/g | 135 ± 2 | 136 | Evaluate method in half cell | – |
| 1C Capacity | mAh/g | 130 ± 2 | 132 | Electrolyte: 1M NaPF6 in esters solvent | – |
| Efficiency | – | – | – | Voltage window: 2.0-4.0V | – |
| 50th Retention (1C) | % | – | 90 | – | – |
| NaOH | wt% | 0.3 | 0.3 | – | METTLER TOLEDO G20 |