自牺牲模板法形成高比表面积SnS@C/MoS2纳米管作为高性能锂离子电池负极,CrystEngComm

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自牺牲模板法形成高比表面积SnS@C/MoS2纳米管作为高性能锂离子电池负极
CrystEngComm ( IF 2.6 ) Pub Date : 2024-03-06 , DOI: 10.1039/d3ce01276j
Songwei Ye ₁ , Zunxian Yang _{1,

2} , Yuliang Ye ₁ , Zhiming Cheng ₁ , Hongyi Hong ₁ , Zhiwei Zeng ₁ , Zongyi Meng ₁ , Qianting Lan ₁ , Hui Zhang ₁ , Ye Chen ₁ , Jiaxiang Wang ₁ , Yuting Bai ₁ , Xudong Jiang ₁ , Benfang Liu ₁ , Jiajie Hong ₁ , Tailiang Guo _{1,

2} , Shen Xu _{1,

2} , Zhenzhen Weng ₃ , Yongyi Chen ₃

Affiliation

碳层通常覆盖传统C层包覆工艺生产的SnS/MoS ₂纳米片的外部，从而导致材料具有较低的比表面积和较少的活性位点。因此，这些所获得的SnS和MoS ₂材料难以直接用作电极材料。非常需要开发一种新的C层涂覆工艺，能够有效涂覆活性材料，同时增加比表面积。本研究采用自牺牲模板法（SSTM）设计并合成了新型SnS@C/MoS _{2纳米管。}具体来说，MoO ₃纳米带首先涂有Sn以生产Sn-MOF，并且通过优雅的SSTM硫化策略获得了保留了特定纳米片结构的SnS@C/MoS _{2纳米管。}这种SSTM制备方法不仅保留了表面的纳米片微结构，而且在表面留下了一层薄薄的无定形碳，大大提高了电导率，有效提高了循环稳定性。除上述优点外，SnS@C/MoS ₂纳米管各组分之间存在协同效应，对电化学性能产生积极影响。当用作锂离子电池（LIB）负极时，SnS@C/MoS _{2复合材料在1 A g}^-1电流密度下循环500次后仍能保持970.9 mAh g ^-1的放电比容量，即使在2 A g ^-1的电流密度下循环1000次后，比放电容量仍为778.1 mAh g ^-1。该方法为其他纳米结构材料的合成提供了参考。

"点击查看英文标题和摘要"

Forming SnS@C/MoS2 nanotubes with high specific surface area via self-sacrificing template method as superior performance anode for lithium-ion batteries

A carbon layer usually covers the outside of SnS/MoS₂ nanosheets produced by a traditional C-layer cladding process, resulting in a material with a lower specific surface area and fewer active sites. Therefore, it is difficult for these as-obtained SnS and MoS₂ materials to be directly employed as electrode materials. There is a great need to develop a new C-layer coating process that can effectively coat active materials and simultaneously increase the specific surface area. In this study, novel SnS@C/MoS₂ nanotubes were designed and synthesized by a self-sacrificing template method (SSTM). Specifically, MoO₃ nanoribbons were first coated with Sn to produce Sn-MOF, and SnS@C/MoS₂ nanotubes with a particular nanosheet architecture preserved were achieved via an elegant SSTM vulcanization strategy. This SSTM preparation method not only retains the nanosheet microstructure of the surface but also leaves a thin layer of amorphous carbon on the surface, which greatly improves the conductivity and effectively improves the cycling stability. In addition to above-mentioned advantages, there is a synergistic effect between the various components of the SnS@C/MoS₂ nanotubes, which has a positive effect on the electrochemical performance. When used as the anode of a lithium-ion battery (LIB), the SnS@C/MoS₂ composite can maintain a specific discharge capacity of 970.9 mAh g⁻¹ after 500 cycles at a current density of 1 A g⁻¹, and a specific discharge capacity of 778.1 mAh g⁻¹ even after 1000 cycles at a current density of 2 A g⁻¹. This method provides a reference for the synthesis of other nanostructured materials.

更新日期：2024-03-07

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