Binder-Free Cnt Cathodes for Li-O₂ Batteries with More Than One Life

Area of Science:

• Electrochemistry
• Materials Science
• Energy Storage

Background:

• Lithium-oxygen batteries (LOBs) degrade due to discharge product buildup and electrode clogging.
• Electrode binder degradation further contributes to capacity fading in LOBs.

Purpose of the Study:

• To develop a binder-free electrode for LOBs using multi-wall carbon nanotubes (MWCNTs).
• To demonstrate a reconditioning method for used LOB electrodes to enable second-life usage.
• To reduce manufacturing and recycling costs for high energy density batteries.

Main Methods:

• Fabrication of free-standing, binder-free electrodes using cross-linked MWCNT networks.
• Cycling performance evaluation of the fabricated electrodes in LOBs.
• Development and validation of a washing-based reconditioning method for spent electrodes.

Main Results:

• The MWCNT electrodes exhibited high porosity, conductivity, and flexibility.
• Electrodes demonstrated reproducible cycling performance in LOBs.
• Reconditioning successfully removed discharge products, enabling a second life with no significant performance loss.

Conclusions:

• Binder-free MWCNT electrodes offer a promising solution for durable and recyclable LOBs.
• The developed reconditioning method significantly extends electrode lifespan and reduces battery waste.
• This approach contributes to the development of greener, cost-effective high energy density batteries.