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In situ construction of amorphous hierarchical iron oxyhydroxide nanotubes via selective dissolution-regrowth strategy for enhanced lithium storage
Science China Materials ( IF 8.1 ) Pub Date : 2020-05-21 , DOI: 10.1007/s40843-020-1337-5
Fangyu Xiong , Fan Lv , Chen Tang , Pengfei Zhang , Shuangshuang Tan , Qinyou An , Shaojun Guo , Liqiang Mai

The low-cost and high-capacity metal oxides/oxyhydroxides possess great merits as anodes for lithium-ion batteries (LIBs) with high energy density. However, their commercialization is greatly hindered by insufficient rate capability and cyclability. Rational regulations of metal oxides/oxyhydroxides with hollow geometry and disordered atomic frameworks represent efficient ways to improve their electrochemical properties. Herein, we propose a fast alkalietching method to realize the in-situ fabrication of iron oxyhydroxide with one-dimensional (1D) hierarchical hollow nanostructure and amorphous atomic structure from the iron vanadate nanowires. Benefiting from the improved electron/ ion kinetics and efficient buffer ability for the volumetric change during the electro-cycles both in nanoscale and atomic level, the graphene-modified amorphous hierarchical FeOOH nanotubes (FeOOH-NTs) display high rate capability (~650 mA h g−1 at 2000 mA g−1) and superior long-term cycling stability (463 mA h g−1 after 1800 cycles), which represents the best cycling performance among the reported FeOOH-based materials. More importantly, the selective dissolutionregrowth mechanism is demonstrated based on the time tracking of the whole transition process, in which the dissolution of FeVO4 and the in-situ selective re-nucleation of FeOOH during the formation of FeOOH-NTs play the key roles. The present strategy is also a general method to prepare various metal (such as Fe, Mn, Co, and Cu) oxides/oxyhydroxides with 1D hierarchical nanostructures.



中文翻译:

通过选择性溶解-再生策略原位构建无定形分级羟基氧化铁纳米管,以增强锂的存储

低成本和高容量的金属氧化物/羟基氧化物作为具有高能量密度的锂离子电池(LIB)的阳极具有很大的优点。但是,它们的商业化受到速率能力和可循环性不足的极大阻碍。具有空心几何形状和无序原子骨架的金属氧​​化物/羟基氧化物的合理规定代表了改善其电化学性能的有效方法。在这里,我们提出了一种快速碱蚀刻的方法来实现原位钒酸铁纳米线制备具有一维(1D)分级空心纳米结构和非晶原子结构的羟基氧化铁。得益于改进的电子/离子动力学和对纳米级和原子级电循环中体积变化的有效缓冲能力,石墨烯改性的非晶级FeOOH-NTs纳米管显示出高倍率能力(约650 mA hg -1在2000毫安克-1)和优异的长期循环稳定性(463毫安汞柱-11800次循环后),代表了已报道的基于FeOOH的材料中最好的循环性能。更重要的是,基于整个过渡过程的时间追踪证明了选择性溶解再生机制,其中FeVO 4的溶解和FeOOH-NTs形成过程中FeOOH的原位选择性再成核起关键作用。本策略还是制备具有一维分层纳米结构的各种金属(例如Fe,Mn,Co和Cu)氧化物/羟基氧化物的通用方法。

更新日期:2020-05-21
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