Construction of well-defined hybrid composites consisting of transition metal sulfides and two-dimensional (2D) carbon nanosheets as high-performance anodes for lithium-ion batteries (LIBs) is of great significance but remains challenging. Herein, we have developed a novel strategy to in-situ fabricate a nanohybrid composites consisting of cobalt-doped copper sulfides nanoparticles embedded in 2D carbon nanosheets (2D Co-Cu2S@C) through a one-pot sulfurization of 2D nanosheet-like Co-doped copper-based metal-organic frameworks (MOFs) precursors. When applied as LIBs anodes, the as-prepared 2D Co-Cu2S@C composites could deliver a specific capacity of 780 mAh g-1 at 0.5 A g-1 after 300 cycles and a high-rate capability with 209 mAh g-1 at 5 A g-1, superior to most reported copper sulfide-based anodes. The exceptional performance could be attributed to the synergism of ultrathin structure (~4 nm), appropriate cobalt doping and strong carbon coupling, resulting in the shortened paths for Li+ transportation, enlarged exposing surface for Li+ adsorption, enhanced electric conductivity for charge transfer as well as robust mechanical property against volume expansion.

中文翻译：

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在超薄碳纳米片中原位嵌入钴掺杂的硫化铜，以实现出色的锂存储性能。

明确定义的由过渡金属硫化物和二维（2D）碳纳米片组成的杂化复合材料作为锂离子电池（LIB）的高性能阳极的用途非常重要，但仍具有挑战性。本文中，我们已经开发出一种新颖的策略，可以通过一锅法将2D纳米片状Co-一氧化碳原位制备纳米杂化复合物，该复合物由嵌入2D碳纳米片中的掺杂钴的硫化铜纳米粒子组成。掺杂的铜基金属有机骨架（MOF）前体。当用作LIB阳极时，制备的2D Co-Cu2S @ C复合材料在300次循环后可在0.5 A g-1下提供780 mAh g-1的比容量，并在209 mAh g-1下提供高倍率的容量5 A g-1，优于大多数报道的基于硫化铜的阳极。