W-incorporated high-performance layered cathode materials for advanced lithium-ion batteries

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• High-nickel, cobalt-free cathode materials are promising for high-energy-density lithium-ion batteries.
• Cobalt removal and high nickel content degrade structural stability and cycle life.
• Improving the electrode-electrolyte interface is crucial for battery performance.

Purpose of the Study:

• To enhance the cyclic stability of high-nickel, cobalt-free cathode materials.
• To investigate the effect of tungsten doping on LiNi0.90Mn0.07Al0.03O2.
• To understand the mechanism behind improved battery performance.

Main Methods:

• Synthesis of W-doped LiNi0.90Mn0.07Al0.03O2 via lithiation.
• Electrochemical performance testing (capacity retention over 100 cycles at 4.3 V).
• Analysis of structural and interfacial stabilization mechanisms.

Main Results:

• W-doping significantly improved cyclic stability, with capacity retention of 90.82% after 100 cycles compared to 88.99% for the pristine material.
• High-valence W6+ passivated the cathode surface, reducing activity.
• Stabilization of the bulk structure and electrode-electrolyte interface was observed.

Conclusions:

• Tungsten doping is an effective strategy to improve the performance of high-nickel, cobalt-free cathode materials.
• The study provides insights into developing advanced cathode materials for lithium-ion batteries.
• W-doped LiNi0.90Mn0.07Al0.03O2 demonstrates potential for next-generation energy storage solutions.