Lithium nickel manganese cobalt oxide, lithium-niobate coated NMC622 cathode active material – Sigma-Aldrich

Synonyms
LiNbO3-coated NMC622, NMC622

General Description
Lithium niobate coated NMC622 is a powdered form of lithium nickel manganese cobalt oxide with a stoichiometry of 6:2:2 Ni:Mn:Co and a typical particle size of 4-10 microns. The particles are coated in 5-10 nm amorphous lithium niobate, less than 1 wt.%.

Applications
LiNbO3-coated NMC622 is a high-performance cathode active material specially designed for lithium-ion batteries (LIBs), particularly solid-state and high-voltage batteries. With a balance of 60% nickel for high capacity and 40% manganese and cobalt for structural stability, NMC622 surpasses NMC811 in terms of cycling lifetime and coulombic efficiencies and offers higher capacity than NMC532. The LiNbO3 coating plays a vital role in enhancing the stability of the cathode material by safeguarding the electrode and electrolyte from undesired reactions. Research suggests that this lithium-niobate coating mitigates reactions between the cathode material and electrolyte, reducing capacity fade over time and impeding the release of metal ions from the NMC cathode. Additionally, the LiNbO3 “insertion layer” improves rate capability by minimizing the space charge layer barrier at the electrolyte/cathode interface. This advancement translates to superior Li diffusion and reduced electrode polarization.

Features & Benefits

• NMC622: High capacity and long cycle lifetimes
• LiNbO3 coating: Enhanced protection for cathode and electrolyte, leading to improved coulombic efficiency
• LiNbO3 insertion layer: Boosts rate capability