2D molybdenum nitride nanosheets as anode materials for improved lithium storage

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Two-dimensional (2D) molybdenum nitride (MoN) nanosheets show potential as anode materials for lithium-ion batteries.
• Current synthesis methods for MoN often involve high temperatures and complex procedures, limiting cost-efficiency.

Purpose of the Study:

• To develop a facile and low-temperature synthesis method for 2D MoN nanosheets.
• To evaluate the performance of these MoN nanosheets as anode materials in lithium-ion batteries.

Main Methods:

• A one-pot solid-state reaction using molybdenum disulfide, sulfur, and sodium amide in an autoclave at 400 °C.
• Electrochemical testing of the synthesized MoN nanosheets as anode electrodes for lithium-ion batteries.

Main Results:

• The synthesis successfully produced 2D MoN nanosheets at a low temperature (400 °C).
• The MoN electrode demonstrated excellent cyclability, retaining 898 mA h g⁻¹ over 400 cycles at 200 mA g⁻¹.
• A superb rate capability was observed, with a capacity of 505 mA h g⁻¹ at 2 A g⁻¹.

Conclusions:

• The developed low-temperature synthesis offers a cost-efficient route to 2D MoN nanosheets.
• The unique 2D nanostructure and high conductivity of MoN contribute to its excellent lithium storage performance.
• These MoN nanosheets represent a promising anode material for next-generation lithium-ion batteries.