Silver embedded porous carbon composite for high-performance lithium-metal anode

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Lithium metal anodes are crucial for high-energy batteries but suffer from dendritic growth during plating/stripping.
• Porous carbon structures from metal-organic frameworks (MOFs) show promise but face challenges in uniform Li deposition and stripping.
• Zeolitic imidazolate framework-8 (ZIF-8) derived carbon is explored as a scaffold for lithium metal anodes.

Purpose of the Study:

• To engineer a stable and efficient lithium metal anode by modifying a ZIF-8 derived carbon structure.
• To improve lithium ion plating and stripping processes within the porous carbon scaffold.
• To investigate the role of silver (Ag) incorporation in enhancing lithium anode performance.

Main Methods:

• Synthesized a porous carbon structure from ZIF-8.
• Replaced residual zinc (Zn) with silver (Ag) using galvanic displacement.
• Optimized Ag incorporation by varying reaction times and temperatures.
• Evaluated electrochemical performance through plating/stripping cycling.

Main Results:

• Silver incorporation into the ZIF-8 derived carbon facilitated uniform lithium plating from the interior to the surface.
• The Ag-modified anode demonstrated improved lithium ion transfer kinetics.
• Optimized galvanic displacement conditions led to enhanced electrochemical stability and performance.

Conclusions:

• The Ag-modified ZIF-8 derived carbon structure offers a promising strategy for developing stable lithium metal anodes.
• This approach addresses key challenges in lithium dendrite formation and promotes efficient charge transfer.
• The findings contribute to the advancement of high-energy battery technologies.