A rechargeable lithium–oxygen battery (LOB) operates via the electrochemical formation and decomposition of solid-state Li2O2 on the cathode. The rational design of the cathode nanoarchitectures is thus required to realize high-energy-density and long-cycling LOBs. Here, we propose a cathode nanoarchitecture for LOBs, which is composed of mesoporous carbon (MPC) integrated with carbon nanotubes (CNTs). The proposed design has the advantages of the two components. MPC provides sufficient active sites for the electrochemical reactions and free space for Li2O2 storage, while CNT forests serve as conductive pathways for electron and offer additional reaction sites. Results show that the synergistic architecture of MPC and CNTs leads to improvements in the capacity (~ 18,400 mAh g− 1), rate capability, and cyclability (~ 200 cycles) of the CNT-integrated MPC cathode in comparison with MPC.

中文翻译：

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用于锂氧电池的介孔碳和碳纳米管的协同纳米结构

可充电锂氧电池 (LOB) 通过阴极上固态 Li2O2 的电化学形成和分解来工作。因此需要合理设计阴极纳米结构以实现高能量密度和长循环的LOB。在这里，我们提出了一种用于 LOB 的阴极纳米结构，它由与碳纳米管 (CNT) 集成的介孔碳 (MPC) 组成。所提出的设计具有这两个组件的优点。MPC 为电化学反应提供了足够的活性位点，并为 Li2O2 存储提供了自由空间，而 CNT 森林则作为电子的传导路径并提供了额外的反应位点。结果表明，与 MPC 相比，MPC 和 CNT 的协同结构可提高 CNT 集成 MPC 正极的容量（~ 18,400 mAh g−1）、倍率性能和循环能力（~ 200 个循环）。