Stabilizing lithium into cross‐stacked nanotube sheets with ultra‐high specific capacity for lithium oxygen battery

Although lithium‐oxygen batteries possess high theoretical energy density and are considered as promising candidates for the next‐generation power systems, how to enhance the safety and cycling efficiency of the lithium anodes while maintaining the high energy storage capability remains difficult. Here, we overcome this challenge by cross‐stacking aligned carbon nanotubes into porous networks for ultrahigh‐capacity lithium anodes to afford high‐performance lithium‐oxygen batteries. The novel anode shows a reversible specific capacity of 3656 mAh/g, approaching the theoretical capacity of 3861 mAh/g of pure lithium. When this anode is employed for lithium‐oxygen full batteries, the cycling stability is significantly enhanced owing to the dendrite‐free morphology and stabilized solid electrolyte interface. This work presents a new pathway to high performance lithium‐oxygen batteries towards practical applications by designing cross‐stacked and aligned structures for one‐dimensional conducting nanomaterials.

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