插层(化学)
法拉第效率
材料科学
离子键合
化学物理
剥脱关节
范德瓦尔斯力
电化学
离子
堆积
阳极
异质结
化学工程
纳米技术
化学
石墨烯
物理化学
电极
无机化学
光电子学
分子
有机化学
工程类
作者
Xu Han,Qing Zhang,Shuai Nan,Xinyu Wang,Jiangli Luo,Longhui Li,Hongen Gu,Lei Tan,Xin Du,Luxiang Wang,Wei Xia,Dan Li
标识
DOI:10.1016/j.jcis.2024.03.196
摘要
The unique superconductivity and charge density wave transition characteristics of NbSe2 make it worthy of exploring its electrochemical performance and potential applications in the field of batteries. Herein, the bulk NbSe2 was successfully exfoliated into few-layered NbSe2 nanostructures by wet grinding exfoliation approach, which solved the issues of its long activation period and poor cycle stability. The strong Nb-Se bond in the plane and weak van der Waals force between the adjacent layers could render the fast Na+ diffusion, provide abundant reaction sites and multi-directional migration paths, thus accelerate the ionic conductivity. The theoretical calculations verified the high Na+ adsorption tendency between the NbSe2 interlayers stemming from the continuous region of charge accumulation. Thanks to the unique electronic and two-dimensional few-layered structures, the exfoliated NbSe2 exhibited a high cyclic stability with a capacity of 502 mA h g-1 over 2800 cycles at 10 A/g. In addition, the reaction mechanism was studied by in-situ X-ray diffraction and other tests, indicating a reaction mechanism containing of simultaneous intercalation (NbSe2↔NaxNbSe2↔NaNbSe2↔Na1+xNbSe2) and conversion processes in NbSe2. This parallelly running mechanism not only alleviates the volume change but also ensures a high specific capacity. Additionally, different lattice planes of the NaNbSe2 intermediate in the intercalation process experience varying degrees of contraction and expanding in d-spacing due to the influence of Coulombic force.
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