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Li-O$_2$ batteries (LOB) performance degradation ultimately occurs throughthe accumulation of discharge products and irreversible clogging of the porouselectrode during the cycling. Electrode binder degradation in the presence ofreduced oxygen species can result in additional coating of the conductivesurface, exacerbating capacity fading. Herein, we establish a facile method tofabricate free-standing, binder-free electrodes for LOBs in which multi-wallcarbon nanotubes (MWCNT) form cross-linked networks exhibiting high porosity,conductivity, and flexibility. These electrodes demonstrate highreproducibility upon cycling in LOBs. After cell death, efficient andinexpensive methods to wash away the accumulated discharge products aredemonstrated, as reconditioning method. The second life usage of theseelectrodes is validated, without noticeable loss of performance. These findingsaim to assist in the development of greener high energy density batteries whilereducing manufacturing and recycling costs.

Binder-free CNT cathodes for Li-O$_2$ batteries with more than one life