Interwoven Phase Stabilization in Ni-Rich Cathode Material via Nanoparticle-Seeded Synthesis

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Nickel-rich layered oxides provide high energy density but degrade quickly due to lattice deformation during cycling.
• Embedding secondary phases can buffer strain and improve structural integrity in cathode materials.

Purpose of the Study:

• To develop a scalable method for creating heterogeneous phase structures in nickel-rich cathodes.
• To enhance the cycling stability of Li(Ni0.8Co0.1Mn0.1)O2 (NCM811) by incorporating strain-buffering phases.

Main Methods:

• Flame-assisted spray pyrolysis using nanoparticle-laden suspension precursors.
• Incorporation of interwoven rocksalt-like and spinel-like phases into layered NCM811.
• Electrochemical cycling, in situ X-ray diffraction, and atomic-resolution HAADF-STEM imaging.

Main Results:

• Enhanced structural stability and improved cycling performance of NCM811 cathodes.
• Formation of coherent, interwoven nanoscale secondary phase domains within the layered matrix.
• Demonstration of a rapid and scalable synthesis approach for phase engineering.

Conclusions:

• The flame-assisted spray pyrolysis method effectively introduces beneficial secondary phases into Ni-rich cathodes.
• Heterogeneous phase engineering using nanoparticle-seeded precursors is a viable strategy for improving cathode cycling stability.
• This approach holds promise for advancing next-generation high-energy-density battery materials.