Constructing High-Performance Lithium-Rich Manganese-Based Cathode Materials for Lithium-Ion Batteries by Surface...

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Layered lithium-rich manganese oxide (LMRO) materials offer high theoretical specific capacity for lithium-ion batteries.
• Practical application of LMRO is hindered by low initial Coulombic efficiency, poor cycling stability, and inadequate rate capability.

Purpose of the Study:

• To enhance the rate performance and cycling stability of LMRO cathode materials.
• To develop a surface modification strategy coupling ion doping for improved electrochemical performance.

Main Methods:

• Surface modification of LMRO with an oxidized MXene layer (TiO2).
• Induction of an in situ spinel phase on the LMRO surface.
• Aluminum doping to form stable Al-O bonds within the material.

Main Results:

• The modified MXT@LNCMAO cathode exhibited a high discharge specific capacity of 270.0 mAh/g with an initial Coulombic efficiency of 91.2% at 0.2 C.
• The in situ spinel phase facilitated lithium-ion diffusion, improving rate performance.
• Aluminum doping enhanced cycling stability, achieving 86.1% capacity retention after 400 cycles at 5 C.

Conclusions:

• The combined MXene surface modification and aluminum doping strategy effectively improves LMRO electrochemical performance.
• This approach offers a promising general strategy for enhancing lithium-ion battery cathode materials.