Carbon and Binder-Free Air Electrodes Composed of Co(3)O(4) Nanofibers for Li-Air Batteries with Enhanced Cyclic Performance

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.