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In this study, to fabricate a carbon free (C-free) air electrode, Co 3 O 4  nanofibers were grown directly on a Ni mesh to obtain Co 3 O 4  with a high surface area and good contact with the current collector (the Ni mesh). In Li-air cells, any C present in the air electrode promotes unwanted side reactions. Therefore, the air electrode composed of only Co 3 O 4  nanofibers (i.e., C-free) was expected to suppress these side reactions, such as the decomposition of the electrolyte and formation of Li 2 CO 3 , which would in turn enhance the cyclic performance of the cell. As predicted, the Co 3 O 4 -nanofiber electrode successfully reduced the accumulation of reaction products during cycling, which was achieved through the suppression of unwanted side reactions. In addition, the cyclic performance of the Li-air cell was superior to that of a standard electrode composed of carbonaceous material.

Carbon and Binder-Free Air Electrodes Composed of Co3O4 Nanofibers for Li-Air Batteries with Enhanced Cyclic Performance