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The electrochemical performance and electrode reactions using ordered mesoporous β-MnO 2 modified with Pd as a cathode catalyst for rechargeable Li-air batteries was reported. Well-ordered mesoporous β-MnO 2 was prepared using mesoporous silica KIT-6 as a template under hydrothermal synthesis of Mn (NO 3) 2· H 2 O. The obtained mesoporous β-MnO 2 shows narrow pore size distribution of 1 nm. With the dispersion of small amounts of Pd to β-MnO 2, mesoporous β-MnO 2 exhibited a high initial discharge capacity of 817 mAh/g-cat. with high reversible capacity. Charging potential is suppressed at 3.6 V vs. Li/Li+, which is highly effective for preventing the decomposition of organic electrolyte. The mesoporous β-MnO 2/Pd electrode shows good rate capability and cycle stability. Ex-situ and in-situ XRD results suggested that the observed capacity comes primarily from the oxidation of Li+ to Li 2 O 2 …