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One of the formidable challenges facing aprotic lithium‐oxygen (Li‐O2) batteries is the high charge overpotential, which induces the formation of byproducts, loss in efficiency, and poor cycling performance. Herein, the synthesis of the ultrasmall Pt‐coated hollow graphene nanocages as cathode in Li‐O2 batteries is reported. The charge voltage plateau can reduce to 3.2 V at the current density of...
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