Dual electronic-ionic conductive 3D current collector for stable lithium metal anodes

Area of Science:

• Materials Science
• Electrochemistry
• Nanotechnology

Background:

• Lithium metal anodes (LMAs) offer high capacity but suffer from dendrite growth and volume expansion, hindering commercialization.
• Existing solutions often fail to provide sufficient stability and uniform lithium deposition.
• Developing advanced current collectors is crucial for overcoming these limitations in lithium metal batteries (LMBs).

Purpose of the Study:

• To engineer a novel 3D current collector for stable lithium metal anodes.
• To improve lithium nucleation and deposition uniformity.
• To enhance the cycling performance and rate capability of lithium metal batteries.

Main Methods:

• In situ growth of cobalt phosphide (Co2P) nanoparticles on nitrogen-doped carbon nanosheets (NC).
• Fabrication of a 3D carbon cloth (CC) framework (CC@Co2P-NC) for molten lithium (Li) pre-storage.
• Characterization of the material's structure, Li affinity, and electrochemical performance in full cells with LiFePO4 (LFP) cathodes.

Main Results:

• The CC@Co2P-NC framework demonstrated excellent lithophilicity and uniform Li nucleation.
• In situ formation of lithium phosphide (Li3P) and cobalt (Co) reinforced the conductive network.
• The CC@Co2P-NC@Li anode exhibited superior interface kinetics and durable cycling performance.
• Full cells achieved enhanced rate capability and prolonged cycling durability.

Conclusions:

• The developed CC@Co2P-NC material significantly advances stable lithium metal anode design.
• This approach offers a promising strategy for the practical application of high-energy lithium metal batteries.
• The study highlights the potential of nanostructured composite current collectors in next-generation energy storage.