The Assembly of a High-Efficiency Tris-benzotriazolate-Based Metal-Organic Framework Solid-State Electrolyte

Area of Science:

• Materials Science
• Electrochemistry
• Chemistry

Background:

• Metal-organic frameworks (MOFs) are promising for solid-state electrolytes (SSEs) in batteries.
• Existing MOFs suffer from low ionic conductivity and poor stability with metal anodes.

Purpose of the Study:

• To synthesize a high-stability MOF with ordered channels for SSE applications.
• To address limitations in current MOF-based SSEs for lithium and sodium batteries.

Main Methods:

• A network-directed approach was used to synthesize the tris-benzotriazolate-based MOF, Cu-TTBT.
• Characterization of ionic conductivity and electrochemical stability of Cu-TTBT.

Main Results:

• Cu-TTBT exhibits high ionic conductivity: 1.83 × 10^-4 S cm^-1 (Li) and 1.1 × 10^-4 S cm^-1 (Na) at 298 K.
• Demonstrated stable cycling over 200 cycles in Li|SSE|LiFePO₄ and Na|SSE|Na₃V₂(PO₄)₃ coin cells.
• Overcame synthetic challenges of tritopic benzotriazolate linkers, advancing azolate-based MOF chemistry.

Conclusions:

• Cu-TTBT represents a significant advancement in azolate-based MOFs for SSE applications.
• The material shows potential for developing robust, high-efficiency solid-state electrolytes for advanced batteries.