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CoSe2 Nanoparticles Encapsulated by N‐Doped Carbon Framework Intertwined with Carbon Nanotubes: High‐Performance Dual‐Role Anode Materials for Both Li‐ and Na‐Ion Batteries
Advanced Science ( IF 14.3 ) Pub Date : 2018-10-17 , DOI: 10.1002/advs.201800763 Jun Yang 1 , Hongcheng Gao 1 , Shuang Men 1 , Zhenqing Shi 2 , Zhang Lin 2 , Xiongwu Kang 1 , Shaowei Chen 1, 3
Advanced Science ( IF 14.3 ) Pub Date : 2018-10-17 , DOI: 10.1002/advs.201800763 Jun Yang 1 , Hongcheng Gao 1 , Shuang Men 1 , Zhenqing Shi 2 , Zhang Lin 2 , Xiongwu Kang 1 , Shaowei Chen 1, 3
Affiliation
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It is of fundamental and technological significance to develop dual‐role anode materials for both lithium‐ion batteries (LIBs) and sodium‐ion batteries (SIBs) with high performance. Here, a composite material based on CoSe2 nanoparticles encapsulated in N‐doped carbon framework intertwined with carbon nanotubes (CoSe2@N‐CF/CNTs) is prepared successfully from cobalt‐based zeolitic imidazolate framework (ZIF‐67). As anode materials for LIBs, CoSe2@N‐CF/CNTs composites deliver a reversible capacity of 428 mAh g−1 even after 500 cycles at a current density of 1 A g−1 with almost 100% Coulombic efficiency. The charge and discharge mechanisms of CoSe2 are characterized using ex situ X‐ray diffraction and Raman analysis, from which the lithiation products of CoSe2 are found to be LixCoSe2 and Li2Se, which are further converted to CoSe2 upon delithiation. The CoSe2@N‐CF/CNTs composites also demonstrate excellent electrochemical performance as anode materials for SIBs with a carbonate‐based electrolyte, with specific capacities of 606 and 501 mAh g−1 at 0.1 and 1 A g−1 in the 100th cycle. The electrochemical performance of the anode materials is further studied by pseudocapacitance and galvanostatic intermittent titration technique (GITT) measurements. This work may be exploited for the rational design and development of dual‐role anode materials for both Li‐ and Na‐ion batteries.
中文翻译：
由与碳纳米管交织的氮掺杂碳框架封装的 CoSe2 纳米粒子：用于锂离子和钠离子电池的高性能双作用阳极材料
开发高性能锂离子电池（LIB）和钠离子电池（SIB）双作用负极材料具有基础和技术意义。在这里，由钴基沸石咪唑酯骨架（ZIF-67）成功制备了一种基于封装在与碳纳米管交织的N掺杂碳骨架中的CoSe 2纳米颗粒的复合材料（CoSe 2 @N-CF/CNTs）。作为锂离子电池负极材料，CoSe 2 @N-CF/CNTs 复合材料即使在 1 A g -1的电流密度下循环 500 次后，仍可提供 428 mAh g -1的可逆容量，库仑效率几乎为 100%。利用非原位X射线衍射和拉曼分析对CoSe 2的充放电机理进行了表征，发现CoSe 2的锂化产物为Li x CoSe 2和Li 2 Se，并进一步转化为CoSe 2脱锂。 CoSe 2 @N-CF/CNTs复合材料还表现出优异的电化学性能，作为碳酸酯基电解质的SIB负极材料，在0.1和1 A g -1下，第100次循环的比容量分别为606和501 mAh g -1 。通过赝电容和恒电流间歇滴定技术（GITT）测量进一步研究了阳极材料的电化学性能。这项工作可用于锂离子电池和钠离子电池双作用负极材料的合理设计和开发。
更新日期：2018-10-17
中文翻译：
由与碳纳米管交织的氮掺杂碳框架封装的 CoSe2 纳米粒子：用于锂离子和钠离子电池的高性能双作用阳极材料
开发高性能锂离子电池（LIB）和钠离子电池（SIB）双作用负极材料具有基础和技术意义。在这里，由钴基沸石咪唑酯骨架（ZIF-67）成功制备了一种基于封装在与碳纳米管交织的N掺杂碳骨架中的CoSe 2纳米颗粒的复合材料（CoSe 2 @N-CF/CNTs）。作为锂离子电池负极材料，CoSe 2 @N-CF/CNTs 复合材料即使在 1 A g -1的电流密度下循环 500 次后，仍可提供 428 mAh g -1的可逆容量，库仑效率几乎为 100%。利用非原位X射线衍射和拉曼分析对CoSe 2的充放电机理进行了表征，发现CoSe 2的锂化产物为Li x CoSe 2和Li 2 Se，并进一步转化为CoSe 2脱锂。 CoSe 2 @N-CF/CNTs复合材料还表现出优异的电化学性能，作为碳酸酯基电解质的SIB负极材料，在0.1和1 A g -1下，第100次循环的比容量分别为606和501 mAh g -1 。通过赝电容和恒电流间歇滴定技术（GITT）测量进一步研究了阳极材料的电化学性能。这项工作可用于锂离子电池和钠离子电池双作用负极材料的合理设计和开发。
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