In situ construction of amorphous hierarchical iron oxyhydroxide nanotubes via selective dissolution-regrowth strategy f
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Published online 21 May 2020 | https://doi.org/10.1007/s40843-020-1337-5
In situ construction of amorphous hierarchical iron oxyhydroxide nanotubes via selective dissolutionregrowth strategy for enhanced lithium storage 1†
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Fangyu Xiong , Fan Lv , Chen Tang , Pengfei Zhang , Shuangshuang Tan , Qinyou An 2,4,5* 1,3* and Liqiang Mai Shaojun Guo ABSTRACT 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 −1 −1 mA h g at 2000 mA g ) and superior long-term cycling −1 stability (463 mA h g 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. Keywords: selective dissolution-regrowth, iron oxyhydroxide, hierarchical nanotube, lithium-ion battery, anode material 1 2 3 4 5
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INTRODUCTION Lithium-ion batteries (LIBs) have been extensively utilized as power sources for portable electronics due to their high energy density and long lifespan. Recently, LIBs were further considered as a promising candidate of energy storage device for application in electric vehicles, hybrid electric vehicles and smart grid systems [1–4]. However, with limited theoretical capacity of graphite as most major anode material for current commercial LIBs −1 (372 mA h g ), their energy/power densities are still far away from the demand in these emerging applications [5– 7]. Thus, the exploitation of new anode materials with higher capacity is urgent. Transition metal oxide/oxyhydroxide materials always possess higher capacity due to their conversion-type reaction mechanism, and have been considered as the next-generation anode materials for high performance LIBs [5–8]. Unfortunately, these materials always suffer from poor rate performance and instability issue owing to the sluggish ki
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