Nitrogen‐doped graphene (NG) is a promising metal‐free catalyst for the oxygen‐reduction reaction (ORR). A facile and low‐cost synthesis of NG via the pyrolysis of graphene oxide and urea is reported. The N content in NG can be up to 7.86%, with a high percentage of graphitic N (≈24%), which gives rise to an excellent catalytic activity toward the ORR.

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Suppressing the Sn coarsening in the Li2O matrix enabled highly reversible conversion between Li2O and SnO2 and an initial Coulombic efficiency of ∼95.5% was achieved.