A metal-organic framework with mixed electron donor and electron acceptor ligands for efficient lithium-ion storage

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Metal-organic frameworks (MOFs) are promising for energy storage due to their tunable structures.
• Developing high-performance anode materials is crucial for next-generation batteries.
• Electron donor-acceptor systems within MOFs can enhance electrochemical properties.

Purpose of the Study:

• To synthesize and characterize a novel 3D MOF based on electron donor (tetrathiafulvalene, TTF) and electron acceptor (naphthalene diimide, NDI) components.
• To evaluate the electrochemical performance of the synthesized Zn-TTF/NDI-MOF as an anode material for batteries.
• To investigate the relationship between the MOF's structure, redox activity, and electrochemical properties.

Main Methods:

• Synthesis of a 3D Zn-TTF/NDI-MOF using TTF and NDI derivatives.
• Electrochemical characterization including cyclic voltammetry and galvanostatic charge-discharge cycling.
• Analysis of the MOF's structure and redox-active sites.

Main Results:

• The synthesized Zn-TTF/NDI-MOF exhibits multiple redox-active sites and significant charge transfer.
• The MOF anode demonstrates excellent rate capability and long-term cycling stability.
• An average specific capacity of 956 mA h g^-1 was achieved at 1 A g^-1 over 600 cycles.

Conclusions:

• Elaborately designed MOFs with integrated electron donor-acceptor units can serve as efficient anode materials.
• The Zn-TTF/NDI-MOF shows great potential for high-performance energy storage applications.
• This work paves the way for the development of advanced MOF-based battery components.