A Free-Standing α-MoO₃/MXene Composite Anode for High-Performance Lithium Storage

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Graphite anodes in lithium-ion batteries limit performance.
• Pseudocapacitor materials like α-MoO3 offer higher theoretical capacity but suffer from low conductivity.
• MXene's excellent conductivity and flexibility make it suitable for advanced electrode development.

Purpose of the Study:

• To develop a high-performance, free-standing anode for lithium-ion batteries by combining α-MoO3 with MXene.
• To overcome the conductivity limitations of α-MoO3 using MXene as a conductive substrate.
• To investigate the electrochemical properties and potential of the α-MoO3/MXene composite as a pseudocapacitor electrode.

Main Methods:

• A green and simple method was employed to synthesize a free-standing α-MoO3/MXene composite anode.
• Electrochemical performance was evaluated, including specific capacity, rate capability, and cycling stability.
• A full cell was assembled using LiFePO4 as the cathode to assess practical performance.

Main Results:

• The α-MoO3/MXene composite electrode demonstrated a high specific capacity of 1008 mAh g-1 at 0.1 A g-1.
• An outstanding rate capability was achieved, retaining 172 mAh g-1 at 10 A g-1.
• The electrode exhibited excellent cycling stability over 500 cycles at 0.5 A g-1.
• The full cell delivered a capacity of 160 mAh g-1 at 0.1 A g-1 and 48 mAh g-1 at 1 A g-1.

Conclusions:

• The α-MoO3/MXene composite free-standing electrode significantly enhances Li+ storage capacity and rate performance.
• This composite material overcomes the intrinsic conductivity limitations of α-MoO3, paving the way for advanced pseudocapacitive electrodes.
• The developed electrode offers a promising alternative for high-performance lithium-ion energy storage devices.