An ordered mesoporous carbon (OMC) as a catalyst-free cathode was tested in a Li–O2 cell, and a detailed investigation of the relation between the size and type of pore morphology against various charge/discharge current densities was performed. The final cathode was a mixture of homemade OMC, polyvinylidene fluoride as binder and a commercial acetylene carbon black deposited over a gas diffusion layer. The cell displayed a high discharge capacity, which was related to the high pore volume, in particular to the mesopore volume of the OMC. The Li–O2 cell assembled with such a cathode was able to deliver a high discharge capacity of 9.25 mA h cm−2. The influence of current rate on the discharge process was also studied, and it was found that a higher current density resulted in a larger discharge overpotential and a lower discharge capacity. In a time-controlled testing mode, the cell exhibited good capacity retention and a prolonged cycle life with a cutoff capacity of 0.98 mA h cm−2.
|Titolo:||Cathodes Based on Noncatalyzed Ordered Mesoporous Carbon for Li–O2 Rechargeable Batteries|
|Data di pubblicazione:||2014|
|Digital Object Identifier (DOI):||10.1002/celc.201402028|
|Appare nelle tipologie:||1.1 Articolo in rivista|
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