Chemical short-range disorder in lithium oxide cathodes

Area of Science:

• Materials Science
• Electrochemistry
• Solid-State Chemistry

Background:

• Layered structures are crucial for lithium (Li)-ion cathodes.
• Li-deficient frameworks degrade during charging, causing capacity loss and reduced battery lifespan.

Purpose of the Study:

• To address degradation issues in Li-ion cathodes.
• To enhance structural and electrochemical stability using chemical short-range disorder (CSRD).

Main Methods:

• Integration of CSRD into oxide cathodes via an improved ceramic synthesis process.
• Demonstration using layered lithium cobalt oxide cathodes.
• Analysis of crystal structure, transition metal environment, and electronic structure.

Main Results:

• CSRD introduction prevents detrimental sliding of crystal slabs and structural deterioration during Li removal.
• Improved electronic conductivity due to effects on the electronic structure.
• Markedly improved cycle life and rate capability of Li-ion cathodes.

Conclusions:

• CSRD is a viable strategy to enhance structural and electrochemical stability in layered oxide cathodes.
• CSRD can be introduced in other layered oxide materials through co-doping.
• Findings offer new design principles for advanced functional materials in energy storage.