基于Sn-MOF组装的C/SnS/MoS_(2)纳米管及其锂离子电池性能研究  

Lithium-Ion Batteries Properties of C/SnS/MoS_(2) Hierarchical Nanotubes Constructed from Tin-Based MOF

作　　者：叶淞玮 杨尊先[1] 郭太良[1] YE Songwei;YANG Zunxian;GUO Tailiang(College of Physics and Information Engineering,Fuzhou University,Fuzhou 350108,China)

机构地区：[1]福州大学物理与信息工程学院,福州350108

出　　处：《真空科学与技术学报》2024年第4期341-349,共9页Chinese Journal of Vacuum Science and Technology

基　　金：国家重点研发计划项目(2023YFB3611203,2016YFB0401503,2016YFB0401305,2016YFB0401103);国家自然科学基金项目(62374032,61574039);福建省自然科学基金项目(2022J01078)。

摘　　要：二硫化钼(MoS_(2))以高理论容量(662 mAhg^(-1))和较大层间距(0.62 nm)一直是锂离子电池负极材料的研究热点。然而,由于MoS_(2)的固有电子/离子导电率差且充放电循环过程中电极材料的体积变化严重,导致MoS_(2)的比容量迅速衰减,阻碍了MoS_(2)材料作为电池电极。在这项工作中,设计并合成了一种新型的C/SnS/MoS_(2)纳米管。具体来说,将Sn以Sn-MOF的形态包覆在一维的MoO3纳米带上,然后硫化得到保留了表面纳米片结构的C/SnS/MoS_(2)纳米管。这种制备方法不仅保留了表面的纳米片结构,也在表面留下来一层薄薄的非晶碳。得益于优越的结构设计,且SnS与MoS_(2)存在着协同作用,这不仅提高了导电性,并且也提升了电池循环的稳定性。做为电极材料时,复合材料能够在0.1 Ag^(-1)电流密度下80次循环后还保持着1110.2 mAhg^(-1)的放电比容量,在2 Ag^(-1)大电流密度下860次循环后保持801.7 mAhg^(-1)的放电比容量。Molybdenum disulfide(MoS_2) has been the focus of research on anode materials for lithium-ion batteries with its high theoretical capacity(662 mAhg^(-1)) and large layer spacing(0.62 nm).However,due to the poor inherent electronic/ionic conductivity of MoS_(2) and the serious change in the volume of the electrode material during the charge-discharge cycle,the specific capacity of MoS_(2) rapidly decays,hindering the MoS_(2) material as a battery electrode.In this work,a novel C/SnS/MoS_(2) nanotube was designed and synthesized.Specifically,Sn was coated with Sn-MOF on one-dimensional MoO3 nanoribbons,and then vulcanized to obtain C/SnS/MoS_(2) nanotubes that retained the surface nanosheet structure.This preparation method not only retains the nanosheet structure of the surface but also leaves a thin layer of amorphous carbon on the surface.Thanks to the superior structural design,there is a synergy between SnS and MoS_2,which not only improves the conductivity but also improves the stability of the battery cycle.When used as electrode material,the composite can maintain 1110.2 mAhg^(-1) discharge specific capacity after 80 cycles at 0.1 Ag^(-1) current density and 801.7 mAhg^(-1) discharge specific capacity after 860 cycles at2 Ag^(-1) high current density.

关 键 词：Sn-MOF 分级结构 一维纳米材料 锂离子电池 

分 类 号：TM919[电气工程—电力电子与电力传动]