Dataset Information

Electrostatic Self-assembly of 0D-2D SnO₂ Quantum Dots/Ti₃C₂T_x MXene Hybrids as Anode for Lithium-Ion Batteries.

ABSTRACT: MXenes, a new family of two-dimensional (2D) materials with excellent electronic conductivity and hydrophilicity, have shown distinctive advantages as a highly conductive matrix material for lithium-ion battery anodes. Herein, a facile electrostatic self-assembly of SnO₂ quantum dots (QDs) on Ti₃C₂T_x MXene sheets is proposed. The as-prepared SnO₂/MXene hybrids have a unique 0D-2D structure, in which the 0D SnO₂ QDs (~ 4.7 nm) are uniformly distributed over 2D Ti₃C₂T_x MXene sheets with controllable loading amount. The SnO₂ QDs serve as a high capacity provider and the "spacer" to prevent the MXene sheets from restacking; the highly conductive Ti₃C₂T_x MXene can not only provide efficient pathways for fast transport of electrons and Li ions, but also buffer the volume change of SnO₂ during lithiation/delithiation by confining SnO₂ QDs between the MXene nanosheets. Therefore, the 0D-2D SnO₂ QDs/MXene hybrids deliver superior lithium storage properties with high capacity (887.4 mAh g^-1 at 50 mA g^-1), stable cycle performance (659.8 mAh g^-1 at 100 mA g^-1 after 100 cycles with a capacity retention of 91%) and excellent rate performance (364 mAh g^-1 at 3 A g^-1), making it a promising anode material for lithium-ion batteries.

SUBMITTER: Liu H

PROVIDER: S-EPMC7770891 | biostudies-literature | 2019 Aug

REPOSITORIES: biostudies-literature

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Electrostatic Self-assembly of 0D-2D SnO2 Quantum Dots/Ti3C2Tx MXene Hybrids as Anode for Lithium-Ion Batteries.

Liu Huan H Zhang Xin X Zhu Yifan Y Cao Bin B Zhu Qizhen Q Zhang Peng P Xu Bin B Wu Feng F Chen Renjie R

Nano-micro letters 20190802 1

MXenes, a new family of two-dimensional (2D) materials with excellent electronic conductivity and hydrophilicity, have shown distinctive advantages as a highly conductive matrix material for lithium-ion battery anodes. Herein, a facile electrostatic self-assembly of SnO2 quantum dots (QDs) on Ti3C2Tx MXene sheets is proposed. The as-prepared SnO2/MXene hybrids have a unique 0D-2D structure, in which the 0D SnO2 QDs (~ 4.7 nm) are ...[more]

PMID: 34138001

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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

Electrostatic Self-assembly of 0D-2D SnO₂ Quantum Dots/Ti₃C₂T_x MXene Hybrids as Anode for Lithium-Ion Batteries.

Publications

Electrostatic Self-assembly of 0D-2D SnO<sub>2</sub> Quantum Dots/Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> MXene Hybrids as Anode for Lithium-Ion Batteries.

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