Dataset Information

Growth of SnO₂ Nanoflowers on N-doped Carbon Nanofibers as Anode for Li- and Na-ion Batteries.

ABSTRACT: It is urgent to solve the problems of the dramatic volume expansion and pulverization of SnO₂ anodes during cycling process in battery systems. To address this issue, we design a hybrid structure of N-doped carbon fibers@SnO₂ nanoflowers (NC@SnO₂) to overcome it in this work. The hybrid NC@SnO₂ is synthesized through the hydrothermal growth of SnO₂ nanoflowers on the surface of N-doped carbon fibers obtained by electrospinning. The NC is introduced not only to provide a support framework in guiding the growth of the SnO₂ nanoflowers and prevent the flower-like structures from agglomeration, but also serve as a conductive network to accelerate electronic transmission along one-dimensional structure effectively. When the hybrid NC@SnO₂ was served as anode, it exhibits a high discharge capacity of 750 mAh g^-1 at 1 A g^-1 after 100 cycles in Li-ion battery and 270 mAh g^-1 at 100 mA g^-1 for 100 cycles in Na-ion battery, respectively.

SUBMITTER: Liang J

PROVIDER: S-EPMC6199068 | biostudies-literature | 2018

REPOSITORIES: biostudies-literature

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Publications

Growth of SnO2 Nanoflowers on N-doped Carbon Nanofibers as Anode for Li- and Na-ion Batteries.

Liang Jiaojiao J Yuan Chaochun C Li Huanhuan H Fan Kai K Wei Zengxi Z Sun Hanqi H Ma Jianmin J

Nano-micro letters 20171208 2

It is urgent to solve the problems of the dramatic volume expansion and pulverization of SnO2 anodes during cycling process in battery systems. To address this issue, we design a hybrid structure of N-doped carbon fibers@SnO2 nanoflowers (NC@SnO2) to overcome it in this work. The hybrid NC@SnO2 is synthesized through the hydrothermal growth of SnO2 nanoflowers on the surface of N-doped carbon fibers obtained by electrospinning. The NC is int ...[more]

PMID: 30393670

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Project description:A SnO2/Ni/CNT nanocomposite was synthesized using a simple one-step hydrothermal method followed by calcination. A structural study via XRD shows that the tetragonal rutile structure of SnO2 is maintained. Further, X-ray photoelectron spectroscopy (XPS) and Raman studies confirm the existence of SnO2 along with CNTs and Ni nanoparticles. The electrochemical performance was investigated via cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and galvanostatic charge-discharge measurements. The nanocomposite has been used as an anode material for lithium-ion batteries. The SnO2/Ni/CNT nanocomposite exhibited an initial discharge capacity of 5312 mA h g-1 and a corresponding charge capacity of 2267 mA h g-1 during the first cycle at 50 mA g-1. Pristine SnO2 showed a discharge/charge capacity of 1445/636 mA h g-1 during the first cycle at 50 mA g-1. This clearly shows the effects of the optimum concentrations of CNTs and Ni. Further, the nanocomposite (SnNiCn) shows a discharge capacity as high as 919 mA h g-1 after 210 cycles at a current density of 400 mA g-1 in a Li-ion battery set-up. Thus, the obtained capacity from the nanocomposite is much higher compared to pristine SnO2. The higher capacity in the nanoheterostructure is due to the well-dispersed nanosized Ni-decorated stabilized SnO2 along with the CNTs, avoiding pulverization as a result of the volumetric change of the nanoparticles being minimized. The material accommodates huge volume expansion and avoids the agglomeration of nanoparticles during the lithiation and delithiation processes. The Ni nanoparticles can successfully inhibit Sn coarsening during cycling, resulting in the enhancement of stability during reversible conversion reactions. They ultimately enhance the capacity, giving stability to the nanocomposite and improving performance. Additionally, the material exhibits a lower Warburg coefficient and higher Li ion diffusion coefficient, which in turn accelerate the interfacial charge transfer process; this is also responsible for the enhanced stable electrochemical performance. A detailed mechanism is expressed and elaborated on to provide a better understanding of the enhanced electrochemical performance.

Dataset Information

Growth of SnO₂ Nanoflowers on N-doped Carbon Nanofibers as Anode for Li- and Na-ion Batteries.

Publications

Growth of SnO<sub>2</sub> Nanoflowers on N-doped Carbon Nanofibers as Anode for Li- and Na-ion Batteries.

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