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In Situ Growth of CoSe2 Coated in Porous Carbon Layers as Anode for Efficient Sodium‐Ion Batteries
Energy Technology ( IF 3.6 ) Pub Date : 2021-01-15 , DOI: 10.1002/ente.202001074 Huaiyun Ge 1 , Siwei Fan 1 , Jianyu Liu 1 , Guangda Li 1
Energy Technology ( IF 3.6 ) Pub Date : 2021-01-15 , DOI: 10.1002/ente.202001074 Huaiyun Ge 1 , Siwei Fan 1 , Jianyu Liu 1 , Guangda Li 1
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A novel composite material of CoSe2/N‐doped carbon box (CoSe2/NC) is successfully synthesized using zeolitic imidazolate frameworks‐67 as the sacrificial templates through a simple two‐step calcine process. The CoSe2 nanoparticles are encapsulated in N‐doped carbon layers, which can seriously avoid agglomeration. When used CoSe2/NC as anode materials for sodium‐ion batteries (SIBs), it exhibits an excellent high reversible specific capacity and a superior cycling stability of 390.2 mA h g−1 at 5 A g−1 over 4000 cycles. The excellent performance of CoSe2/NC can be attributed to cooperation of CoSe2 nanoparticles and N‐doped carbon layers. Carbon layers coated on the surface of CoSe2 nanoparticles not only improve a well conductivity to facilitate the charge transfer, but also buffer the structure to expand during the Na+ insertion/extraction process. Furthermore, this novel porous structure provides more active sites and increases contact areas between the materials and the electrolyte, thus increasing the specific capacity and cycle stability. This work provides a possibility of anode materials for SIBs with excellent electrochemistry performance.
中文翻译：
多孔碳层中CoSe2的原位生长作为高效钠离子电池的阳极
通过简单的两步煅烧过程，使用沸石咪唑盐骨架67作为牺牲模板成功地合成了一种新型的CoSe 2 / N掺杂碳盒复合材料（CoSe 2 / NC）。CoSe 2纳米颗粒被封装在N掺杂的碳层中，可以严重避免团聚。当将CoSe 2 / NC用作钠离子电池（SIB）的负极材料时，它具有出色的高可逆比容量，在4000次循环中在5 A g -1下具有390.2 mA h g -1的优异循环稳定性。CoSe 2 / NC的出色性能可归因于CoSe 2的合作纳米颗粒和N掺杂碳层。涂在CoSe 2纳米颗粒表面的碳层不仅提高了电导率以促进电荷转移，而且缓冲了在Na +插入/提取过程中扩展的结构。此外，这种新颖的多孔结构提供了更多的活性位点，并增加了材料与电解质之间的接触面积，从而提高了比容量和循环稳定性。这项工作为具有优异电化学性能的SIB提供了一种阳极材料。
更新日期：2021-03-04
中文翻译：
多孔碳层中CoSe2的原位生长作为高效钠离子电池的阳极
通过简单的两步煅烧过程，使用沸石咪唑盐骨架67作为牺牲模板成功地合成了一种新型的CoSe 2 / N掺杂碳盒复合材料（CoSe 2 / NC）。CoSe 2纳米颗粒被封装在N掺杂的碳层中，可以严重避免团聚。当将CoSe 2 / NC用作钠离子电池（SIB）的负极材料时，它具有出色的高可逆比容量，在4000次循环中在5 A g -1下具有390.2 mA h g -1的优异循环稳定性。CoSe 2 / NC的出色性能可归因于CoSe 2的合作纳米颗粒和N掺杂碳层。涂在CoSe 2纳米颗粒表面的碳层不仅提高了电导率以促进电荷转移，而且缓冲了在Na +插入/提取过程中扩展的结构。此外，这种新颖的多孔结构提供了更多的活性位点，并增加了材料与电解质之间的接触面积，从而提高了比容量和循环稳定性。这项工作为具有优异电化学性能的SIB提供了一种阳极材料。
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