Lithium-Air Battery (LAB) is expected to develop ultra-high energy density batteries, but the low rate performance and poor cycle life of present LAB cells hinder practical development. Here we report that a highly porous carbon nanotube (CNT) cathode dramatically enhances the rate capability of LAB. Single-walled CNTs (SWCNTs) with wavy patterns prepared from the Super-Growth (SG) method successfully provided CNT sheets with high porosity of up to 94%. The pore structure was characterized by two distinct pores in size, namely, highly extended mesoscale (approximately 5–200 nm) pores formed inside CNT bundles that provide large surface area for oxygen reduction reaction (ORR) and inter-bundle gaps in a micrometer scale that works for oxygen diffusion path. This porous CNT sheet cathode significantly increased the discharge rate of LAB cells, specifically enabling a high discharge current density of 3.0 mA/cm² securing practical cell capacity of 3.3 mAh/cm², which is comparable to the current LiB technology that provides ∼3 mAh/cm² cell capacity at ∼1C rate (∼3 mA/cm²) discharge. Furthermore, this highly porous cathode was also effective for extending the cycle life of LAB cells. Such bimodal pore architecture of the CNT sheet cathode paves the new strategy for developing high-power energy-dense LAB.

锂空气电池（LAB）有望开发出超高能量密度电池，但目前LAB电池的低倍率性能和较差的循环寿命阻碍了实际发展。在这里，我们报告了高度多孔的碳纳米管 (CNT) 阴极显着提高了 LAB 的倍率能力。通过超生长 (SG) 方法制备的具有波浪形图案的单壁 CNT (SWCNT) 成功地提供了具有高达 94% 的高孔隙率的 CNT 片材。孔结构的特征在于大小不同的两个孔，即在 CNT 束内部形成的高度扩展的中尺度（约 5-200 nm）孔，为氧还原反应 (ORR) 和微米级的束间间隙提供大表面积这适用于氧气扩散路径。这种多孔 CNT 片阴极显着提高了 LAB 电池的放电率，²确保了 3.3 mAh/cm ^{2 的}实际电池容量，这与目前的 LiB 技术可比，该技术可在～1C 速率（～3 mA/cm ²）放电下提供～3 mAh/cm ²电池容量。此外，这种高度多孔的阴极也可有效延长 LAB 电池的循环寿命。CNT 片阴极的这种双峰孔结构为开发高功率能量密集型 LAB 奠定了新的策略。