Structural Optimization of Rod-like Mn₂SnO₄@C Derived from MOFs as an Anode Material for High-Performance Li-Ion...

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Metal-organic frameworks (MOFs) possess unique structures suitable for energy storage applications.
• Optimizing electrode materials often involves integrating MOF-like structures into other materials.
• Rod-shaped nanostructures can improve electrochemical performance by increasing surface area and reducing ion diffusion paths.

Purpose of the Study:

• To synthesize rod-shaped Mn₂SnO₄@C using a rod-shaped MOF precursor (Mn-BTC) for enhanced energy storage.
• To investigate the structural inheritance from MOFs for improved electrochemical properties.
• To evaluate the performance of Mn₂SnO₄@C as an anode material in lithium-ion capacitors.

Main Methods:

• Synthesis of rod-shaped Mn₂SnO₄@C from Mn-BTC MOF precursor with tin source regulation.
• Electrochemical characterization including specific capacity, cycling stability, energy density, and power density measurements.
• Assembly and testing of Mn₂SnO₄@C//AC lithium-ion capacitors.

Main Results:

• The synthesized Mn₂SnO₄@C exhibited excellent specific capacity (608.3 mAh g⁻¹ after 150 cycles at 0.1 A g⁻¹) and long-term stability (179.2 mAh g⁻¹ after 2000 cycles at 1 A g⁻¹).
• The Mn₂SnO₄@C//AC lithium-ion capacitor achieved a maximum energy density of 124.7 Wh kg⁻¹ and a high power density of 20,000 W kg⁻¹.
• A specific capacity of 44.5 mAh g⁻¹ at 2 A g⁻¹ was recorded for the capacitor.

Conclusions:

• Inheriting MOF structures effectively enhances the electrochemical performance of derived materials.
• The rod-shaped Mn₂SnO₄@C demonstrates significant potential as an anode material for high-performance lithium-ion capacitors.
• This study offers novel strategies for the structural optimization of energy storage materials through MOF templating.