Constructing Li-O-Vacancy Configuration Coupling with a Layered/Spinel Mixed Structure in Li-Deficient Li-Rich...

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Li-rich layered oxide cathodes offer high energy density for next-generation Li-ion batteries.
• Unstable oxygen redox processes cause performance decay due to oxygen release and structural degradation.

Purpose of the Study:

• To enhance the structural and electrochemical stability of Li-rich layered oxide cathodes.
• To mitigate performance decay by stabilizing the Li-O-Li configuration and oxygen redox.

Main Methods:

• Construction of a layered/spinel heterostructure in a Li-rich layered oxide cathode.
• Stabilization of the Li-O-vacancy configuration within the cathode structure.

Main Results:

• Achieved an initial discharge capacity of 232 mAh g^-1 with 90.5% Coulombic efficiency.
• Retained 86.5% of capacity after 100 cycles, demonstrating excellent stability.
• Successfully coupled a layered/spinel heterostructure with a stabilized Li-O-vacancy configuration.

Conclusions:

• The proposed structural design strategy offers a new pathway toward high-performance Li-rich layered oxide cathodes.
• The heterostructure and stabilized vacancy configuration significantly improve electrochemical stability and cycle life.
• This approach addresses key challenges in Li-rich cathode materials for advanced batteries.