This study reports the synthesis of hierarchical NiCoO2 nanosheets growing on hollow carbon spheres (denoted as NiCoO2 NSs@HCS) via a facile and low-cost process. When evaluated as anode materials for lithium-ion batteries, the as-prepared NiCoO2 NSs@HCS exhibits high specific capacity, enhanced cycling stability, and good rate capability. A high discharge capacity of 631.7 mA h g-1 is delivered even after 200 cycles at a current density of 400 mA g-1 , corresponding to approximately 92 % of the second reversible discharge capacity. The hierarchical and hollow structure of NiCoO2 NSs@HCS plays a role in its excellent performance.

中文翻译：

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用于高性能锂离子电池阳极的空心碳球上固定的分层NiCoO2纳米片。

这项研究报告了通过一种简便且低成本的方法合成在空心碳球上生长的分层NiCoO2纳米片的方法（表示为NiCoO2 NSs @ HCS）。当评估为锂离子电池的负极材料时，所制备的NiCoO2 NSs @ HCS具有高比容量，增强的循环稳定性和良好的倍率性能。甚至在200次循环后，在400 mA g-1的电流密度下仍可提供631.7 mA h g-1的高放电容量，大约相当于第二可逆放电容量的92％。NiCoO2 NSs @ HCS的分层和空心结构在其出色的性能中发挥了作用。