Brushed Metals for Rechargeable Metal Batteries

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Rechargeable metal batteries offer higher energy density than metal-ion batteries.
• Controlling parasitic surface reactions on metal anodes is crucial for their practical application.
• Current methods face challenges in preventing dendrite formation and ensuring anode stability.

Purpose of the Study:

• To develop a facile and solvent-free method for fabricating protective surface films on metal anodes.
• To investigate the impact of these surface films on the electrochemical performance of lithium metal anodes.
• To enable the development of high-performance rechargeable metal batteries.

Main Methods:

• A solvent-free brushing method was employed to deposit powder films onto lithium and sodium metal foils.
• The P2S5-modified lithium anodes were studied in liquid electrolyte cells using in-operando techniques.
• Electrochemical performance was evaluated using symmetric cells and cells paired with LiFePO4 cathodes.

Main Results:

• The P2S5-modified lithium anodes exhibited smoother electrode contours and more uniform metal deposition/dissolution.
• Modified anodes showed ultralow polarization, lasting over 4000 hours in symmetric cells (8x longer than bare Li anodes).
• Capacity retention was ~70% higher when paired with a LiFePO4 cathode after 340 cycles.

Conclusions:

• The brush coating method effectively creates artificial solid-electrolyte interphases on metal anodes, preventing parasitic reactions.
• This approach significantly enhances the cycle life and stability of lithium metal anodes.
• Solvent-free brush coating presents a scalable and promising strategy for advanced rechargeable metal battery fabrication.