Flower-like amorphous metal-organic-frameworks-based hybrid-solid-state electrolyte for high-performance...

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Traditional crystalline metal-organic frameworks (MOFs) face limitations in ionic conductivity and stability for advanced battery applications.
• Developing novel electrolyte materials is crucial for enhancing the safety and performance of lithium-metal batteries.

Purpose of the Study:

• To investigate the potential of amorphous copper-based metal-organic frameworks (aMOFs) as solid-state electrolytes (SSEs).
• To evaluate the electrochemical performance of flower-like porous amorphous Cu-aMOF-based SSEs in lithium-metal batteries.

Main Methods:

• Synthesis of flower-like porous amorphous Cu-aMOF.
• Characterization of the amorphous Cu-aMOF structure and properties.
• Electrochemical testing of the SSE, including ionic conductivity, lithium ion transference number, and cycling performance in lithium-metal cells.

Main Results:

• The amorphous Cu-aMOF-based SSE achieved an ionic conductivity of 1.61 × 10^-3 S cm^-1 at 30 °C.
• A high lithium ion transference number of 0.71 was recorded.
• Uniform lithium deposition was maintained for 4000 hours at 0.1 mA cm^-2, with excellent cycling and rate performance.

Conclusions:

• Amorphous MOFs, with their continuous structures, defects, and active sites, offer significant advantages over crystalline counterparts for SSE applications.
• The flower-like porous amorphous Cu-aMOF-based SSE shows great promise as a high-performance electrolyte material for next-generation lithium-metal batteries.