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Boosted charge transfer and Na-ion diffusion in cooling-fins-like Sb2Te3-Te nano-heterostructure for long cycle life and high rate capability anode
Nano Energy ( IF 17.6 ) Pub Date : 2020-01-08 , DOI: 10.1016/j.nanoen.2020.104468
Hong Yin , Wangqiang Shen , Hong-Qing Qu , Chong Li , Ming-Qiang Zhu

To improve the electronic conductivity and accelerate the Na-ion diffusion in active materials for sodium-ion batteries (SIBs), Sb2Te3-Te nano-heterostructure (STNH) electrodes are constructed based on the hierarchical nanostructures of two-dimensional (2D) Sb2Te3 nanoblades serialized by one-dimensional (1D) Te nanowires for high-performance anode material. The STNH electrode can deliver high sodium storage capacity of 375 mAh g-1 at 100 mA g-1 after 200 cycles and provides a capacity of 226 mAh g-1 at 15 A g-1, even can obtain a high capacity of 365 mAh g-1 at 1.5 A g-1 after 1000 cycles, respectively. The sodiation/desodiation reaction mechanism is also investigated by ex-situ selected-area electron diffraction (SAED) and in situ X-ray diffraction (XRD). The enhanced sodium storage properties of STNH are mainly attributed to the integrated merits of both 1D and 2D with enhanced charge carrier migration and good structure stability. This work gives the rational guidance to design novel hierarchical nanostructures integrating 1D and 2D nano-heterojunction materials for advanced battery materials. The as-designed STNH electrode enhances sodium storage with potential interest in SIBs.



中文翻译:

增强散热片状Sb 2 Te 3 -Te纳米异质结构中的电荷转移和Na离子扩散,从而延长了循环寿命并提高了阳极速率

为了提高电子电导率并加速钠离子电池(SIB)活性材料中Na离子的扩散,基于二维(2D)分层纳米结构构造了Sb 2 Te 3 -Te纳米异质结构(STNH)电极)通过一维(1D)Te纳米线序列化的Sb 2 Te 3纳米刀片,用于高性能阳极材料。STNH电极在200次循环后可在100 mA g -1下提供375 mAh g -1的高钠存储容量,在15 A g -1下可提供226 mAh g -1的容量,甚至可以获得365 mAh的高容量g -1在1.5 A g -1经过1000次循环。所述sodiation / desodiation反应机理也通过调查易地选择区域电子衍射(SAED)和原位X射线衍射(XRD)。STNH增强的钠储存性能主要归因于1D和2D的综合优点,具有增强的电荷载流子迁移和良好的结构稳定性。这项工作为设计用于高级电池材料的集成1D和2D纳米异质结材料的新型分层纳米结构提供了合理的指导。设计好的ST​​NH电极增强了钠的储存,对SIB具有潜在的意义。

更新日期:2020-01-09
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