Structural Understanding for High-Voltage Stabilization of Lithium Cobalt Oxide

Area of Science:

• Materials Science
• Electrochemistry
• Solid-State Chemistry

Background:

• Modern electronics demand higher energy density from lithium-ion batteries.
• Lithium cobalt oxide (LiCoO$_{2}$; LCO) is a key cathode material, but its high-voltage instability limits performance.
• Structural stabilization of LCO is crucial for improving battery capacity and energy density.

Purpose of the Study:

• To provide a fundamental understanding of the LCO cathode structure based on long-term studies.
• To elucidate multi-scale structural issues, their origins, and stabilization strategies for LCO.
• To advance knowledge of LCO structure and its relationship with electrochemical performance.

Main Methods:

• Comprehensive review and analysis of long-term studies on LCO cathode structure.
• Investigation of bulk and surface structural properties of LCO.
• Examination of structural degradation mechanisms and stabilization techniques.

Main Results:

• Detailed understanding of multi-scale structural features of LCO (bulk and surface).
• Identification of origins of structural instabilities at high voltages.
• Elucidation of various stabilization strategies and their specific mechanisms.

Conclusions:

• Deepened knowledge of LCO structure and its electrochemical performance relationship.
• Highlighted remaining challenges and future opportunities for LCO structural stabilization.
• Provided a foundation for developing more stable and high-performance LCO cathodes.