In Situ Assembly Engineering-Induced 3D MOF-Driven MXene Framework for Highly Stable Na Metal Anodes

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Sodium metal anodes offer high energy density but face challenges like dendrite growth and volume expansion.
• Developing advanced materials is crucial for stable and safe sodium metal anodes.

Purpose of the Study:

• To design and synthesize a MXene-based hybrid material for enhanced sodium metal anodes.
• To improve sodium ion deposition and mitigate volume expansion issues.

Main Methods:

• Integration of MOF-derived Zn, Co, N, and C dopants with Ti3C2Tx MXene.
• Fabrication of a hybrid material serving as a hosting substrate for sodium metal anodes.

Main Results:

• The optimized material demonstrated excellent Coulombic efficiency (99.99% over 3000 cycles).
• Achieved stable cycling for over 5000 hours in symmetrical cells.
• Maintained over 80% capacity retention at 3C after 500 cycles in full-cell tests.

Conclusions:

• The developed MXene-based hybrid material shows significant potential as a robust sodium metal anode.
• The material effectively enhances conductivity and promotes uniform sodium deposition, addressing key anode challenges.