As a typical metal selenide, CoSe is a kind of foreground anode material for lithium-ion batteries (LIBs) because of its two-dimensional layer structure, good electrical conductivity, and high theoretical capacity. In this work, the original CoSe/N-doped carbon (CoSe/NC) composites were synthesized using ZIF-67 as a precursor, in which the CoSe nanoparticles are encapsulated in NC nanolayers and they are connected through C-Se bonds. The coating structure and strong chemical coupling make the NC nanolayers could better effectively enhance the lithium storage properties of CoSe/NC composites. As a consequence, the CoSe/NC composites deliver a reversible capacity of 310.11 mAh g-1 after 500 cycles at 1.0 A g-1. Besides, the CoSe/NC composites show a distinct incremental behavior of capacity.

中文翻译：

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ZIF-67衍生的CoSe / NC复合材料作为锂离子电池的负极材料。

作为典型的金属硒化物，CoSe具有二维层结构，良好的导电性和较高的理论容量，是锂离子电池（LIB）的一种前景阳极材料。在这项工作中，使用ZIF-67作为前体合成了原始的CoSe / N掺杂碳（CoSe / NC）复合材料，其中CoSe纳米颗粒被封装在NC纳米层中，并通过C-Se键连接。涂层结构和强大的化学偶联作用使得NC纳米层可以更好地有效增强CoSe / NC复合材料的储锂性能。结果，CoSe / NC复合材料在1.0 A g-1下经过500次循环后可提供310.11 mAh g-1的可逆容量。此外，CoSe / NC复合材料显示出明显的容量增加行为。