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
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
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DOI：
10.1002/advs.201800763
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发表时间：
2018-10
期刊：
影响因子：
15.1
通讯作者：
Jun Yang;Hongcheng Gao;Shuang Men;Zhenqing Shi;Zhang Lin;Xiongwu Kang;Shaowei Chen
中科院分区：
文献类型：
--
作者：
Jun Yang;Hongcheng Gao;Shuang Men;Zhenqing Shi;Zhang Lin;Xiongwu Kang;Shaowei Chen
开发高性能的锂离子电池(LIBS)和钠离子电池(SIB)双功能负极材料具有重要的基础和技术意义。本文以钴基沸石咪唑骨架(ZIF-67)为原料，成功地制备了以碳纳米管缠绕的N掺杂碳骨架包裹CoSe2纳米颗粒的复合材料(CoSe2@N-CF/CNTs)。作为锂离子电池负极材料，CoSe2@N-Cf/碳纳米管复合材料在1A g−1的电流密度下循环500次后的可逆容量为428mAhg−1，库仑效率几乎为100%。用X射线衍射仪和拉曼光谱对CoSe_2的充放电机理进行了表征，发现CoSe_2的锂化产物为LixCoSe_2和Li2Se，而LixCoSe_2和Li2Se在脱锂时转化为CoSe_2。CoSe_2@N-Cf/碳纳米管复合材料也表现出优异的电化学性能，在碳酸盐基电解液中，其比容量分别为606mAhg−1和501mAhg−1，在第100次循环中的比容量分别为1 A g CNTs 1和1 A g CNTs 1。通过伪电容和恒电流间歇滴定技术(GITT)进一步研究了负极材料的电化学性能。这项工作可为锂离子电池和钠离子电池双功能负极材料的合理设计和开发提供参考。
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.