BN-P2C is a P/O hybrid-phase layered oxide cathode material with the general formula NaNiₓFeᵧMn₁₋ₓ₋ᵧO₂, where P2 (trigonal prismatic Na⁺ sites) and O3 (octahedral Na⁺ sites) phases coexist. This dual-phase structure synergizes the advantages of both phases: P2 offers fast Na⁺ diffusion and structural stability, while O3 provides higher Na⁺ content and capacity.

Key Features

Structure & Composition:
- P2/O3 intergrowth mitigates irreversible phase transitions during cycling, enhancing structural integrity.
- Transition metals (Ni, Fe, Mn) balance cost and performance: Ni boosts capacity, Mn stabilizes the framework, and Fe reduces costs.
Performance Advantages:
- High reversible capacity: ~130–140 mAh/g at 0.1C, with stable output at 1C (~120 mAh/g).
- Improved cyclability: Hybrid-phase interfaces suppress layer sliding and volume changes, achieving >90% capacity retention after 50 cycles.
- Enhanced kinetics: P2-phase channels accelerate Na⁺ diffusion, enabling better rate capability.
Challenges & Optimization:
- Air sensitivity: Surface residual alkali (e.g., NaOH) requires protective coatings (e.g., Al₂O₃, NaTi₂(PO₄)₃).
- High-voltage instability: Doping (e.g., Ti, Mg) stabilizes the lattice above 4.0 V vs. Na⁺/Na.

Applications

BN-P2C is tailored for large-scale energy storage (grid storage, EVs) due to its low cost, compatibility with existing manufacturing, and balanced energy/power density. Ongoing research focuses on entropy engineering and morphology control to further improve performance.

Specifications

Item	Unit	Specification	Value	Reference Standard	Test Equipment Model
Na	wt%	17.1±0.3	16.9	GB/T 27598-2011	Agilent 5800
Ni	wt%	12.6±0.3	12.7	-	-
Fe	wt%	12.0±0.3	12.1	-	-
Mn	wt%	23.6±0.3	23.5	-	-
D10	μm	5.5±0.5	5.6	GB/T 19077-2016	Mastersizer 3000 (AERO S, dry method)
D50	μm	9.5±0.5	9.9	GB/T 19077-2016	-
D90	μm	17.5±0.5	17.9	GB/T 5162-202X	-
Tap density	g/cm³	≥1.2	1.45	-	Micromeritics TriStar 3030
SSA	m²/g	-	-	GB/T 19587-2004	Micromeritics GeoPyc 1365
2TPD	g/cm³	-	-	GB/T 24533-2019	MYCRO Carver 4350
0.1C capacity	mAh/g	130±2	130.2	Half-cell evaluation method	-
First-cycle efficiency	%	≥95	96.3	Electrolyte: 1M NaPF6 in diglyme	-
1C reversible capacity	mAh/g	120±2	118.4	Voltage window: 2.0-4.1V	-
50th retention	%	≥95	97.9	-	-

Inquiry Cart 0