P2-Type Na2/3Ni1/3Mn2/3O2 (NNMO) Powder for Na-Ion Battery Cathode, 50-200 g/bottle, CSIBCNNMO

The Sodium Nickel Manganese Oxide (Na[NixMn(1-x)O2]) cathode with P2-type layered structure is one of the most promising and heavily researched candidates for sodium-ion batteries (SIBs). The trigonal prismatic sites in the P2 layered structure offer wider pathways and a lower energy barrier for Na+ diffusion, leading to better rate performance. This class of materials is attractive due to its high energy density potential, low cost (using earth-abundant Mn and Na), and the potential for a "drop-in" manufacturing process similar to that for LIBs.

NNMO crystallizes in a hexagonal lattice within the P63/mmc space group. (1) Prismatic Sites: The "P" designation signifies that the sodium (Na+) ions occupy trigonal prismatic coordination environments sandwiched between edge-sharing {TMO}6 ({TM} = {Ni, Mn}) octahedral sheets. (2) Fast Diffusion Pathways: Unlike O3-type phases where sodium must pass through restrictive tetrahedral intermediate sites during hopping, the shared rectangular faces between adjacent prismatic sites in P2-NNMO present a much lower activation energy barrier. This enables exceptionally fast Na+ diffusion coefficient kinetics and superior rate performance. (3) Valence Distinctions: To maintain structural and charge stability, manganese is held fixed in its electrochemically inactive +4 state ({Mn}^{4+}), which effectively acts as a structural pillar and suppresses Jahn-Teller lattice distortions. Capacity is delivered entirely through the two-electron extraction/insertion of nickel ({Ni}^{2+} ↔ Ni}^{3+} ↔ {Ni}^{4+}).

Part Number	CSIBCNNMO (C-SIB-C-NNMO)
Chemical Formula	Na0.67Ni0.33Mn0.67O2 (P2 type)
Chemical Composition	Na: 20.25 wt%, Ni+Mn = 50.08 wt%
Particle Size Distribution	D10 = 3.16 um;  D50 =10.47 um;   D90 = 25.97 um
Tap Density	1.59 g/cm3
Specific Area	0.84 m2/g
XRD
First Discharging Capacity	~118 mAh/g (0.1 C, 2.0-4.25 V, Na)
First Columbic Efficiency	95.0%
Cycling Stability
Package Grade	50 g, 100 g, and 200 g/bottle

Notes: (1) Please store the NNMO powder in a dry area (glovebox is preferred); (2) The battery powder is highly recommended to be dried at 80-100°C in a vacuum oven for 6-12 h before use.

References: 

1. 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.
2. 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.