Abstract
AbstractDeveloping an efficient cathode is essential to obtain high rate capability and rechargeable lithium oxygen (Li‐O2) batteries. Herein, ruthenium (Ru)‐functionalized hierarchical carbon nanocages (hCNCs) are synthesized and employed as a cathode catalyst for Li‐O2 batteries. The as‐prepared cathode exhibits high discharge capacity, low charge potential (8135 mA h g−1 with 3.85 V charge potential at a current density of 0.08 mA cm−2), outstanding rate capability (3416 mA h g−1 at a current density of 0.48 mA cm−2) and good stability up to 78 cycles at a limited capacity of 500 mA h g−1. Such excellent battery performance is ascribed to the synergistic effect of the interconnected hierarchically porous structure of hCNCs, which can facilitate effective electrolyte immersion and efficient Li+/O2 mass transport, and the high catalytic activity of Ru nanoparticles.
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