Ordered mesoporous carbon electrodes for Li-O2 batteries.
Ordered mesoporous carbon (OMC) with highly ordered pore channels was applied as an oxygen-side electrode for a Li-O2 battery. To evaluate the effect of the pore channel size on battery performance, we employed OMCs possessing two different pore sizes (6 and 17 nm). When cycled at a current density of 200 mA g(-1)carbon, the OMC electrodes reduced polarization in the oxygen evolution reaction by 0.1 V compared to those consisting of conventional super P carbon electrode. X-ray diffraction and transmission electron microscopy of the discharged oxygen electrodes provided evidence for the formation of amorphous Li2O2, a product of the oxygen reduction reaction, inside the OMC pores rather than on the electrode surface as in the case of the super P electrode. The OMC electrodes were also effective at high current densities (500 mA g(-1)carbon and 1000 mA g(-1)carbon).
Department of Energy Engineering and §Department of Materials Science and Engineering, Hanyang University , Seoul 133-791, Republic of Korea.
Jin-Bum
JB
Park
Jinwoo
J
Lee
Chong Seung
CS
Yoon
Yang-Kook
YK
Sun
D002244:Carbon / Q000737:chemistry; D011211:Electric Power Supplies; D055664:Electrochemical Techniques; D004566:Electrodes; D008094:Lithium / Q000737:chemistry*; D010100:Oxygen / Q000737:chemistry*; D016062:Porosity
D002244:Carbon; D008094:Lithium; D010100:Oxygen