6 research outputs found
One-Step Urothermal Synthesis of Li<sup>+</sup>‑Intercalated SnS<sub>2</sub> Anodes with High Initial Coulombic Efficiency for Li-Ion Batteries
Tin sulfide, as a promising anode material for Li-ion
batteries,
suffers from high-capacity loss during cycling and low initial Coulombic
efficiency, which limits its further application. In order to solve
these problems, Li+-intercalated SnS2 with expanded
interlayer spacing (0.89 nm) was prepared by the one-step urothermal
method. The successful synthesis of Li+-intercalated SnS2 is confirmed by means of X-ray diffraction, scanning electron
microscopy, transmission electron microscopy, energy-dispersive X-ray
spectroscopy, inductively coupled plasma emission spectrometer test,
and exfoliation experiment. Compared with pure SnS2, the
Li+-intercalated SnS2 electrode displays a higher
initial Coulombic efficiency (79.3%) than the pure SnS2 electrode (55%). Also, Li+-intercalated SnS2 exhibits more excellent rate performance (548.4 mAh g–1 at 2 A g–1 and 216.6 mAh g–1 at 10 A g–1) and cycling performance (647.7 mAh
g–1 at 0.1 A g–1 after 100 cycles)
One-Step Urothermal Synthesis of Li<sup>+</sup>‑Intercalated SnS<sub>2</sub> Anodes with High Initial Coulombic Efficiency for Li-Ion Batteries
Tin sulfide, as a promising anode material for Li-ion
batteries,
suffers from high-capacity loss during cycling and low initial Coulombic
efficiency, which limits its further application. In order to solve
these problems, Li+-intercalated SnS2 with expanded
interlayer spacing (0.89 nm) was prepared by the one-step urothermal
method. The successful synthesis of Li+-intercalated SnS2 is confirmed by means of X-ray diffraction, scanning electron
microscopy, transmission electron microscopy, energy-dispersive X-ray
spectroscopy, inductively coupled plasma emission spectrometer test,
and exfoliation experiment. Compared with pure SnS2, the
Li+-intercalated SnS2 electrode displays a higher
initial Coulombic efficiency (79.3%) than the pure SnS2 electrode (55%). Also, Li+-intercalated SnS2 exhibits more excellent rate performance (548.4 mAh g–1 at 2 A g–1 and 216.6 mAh g–1 at 10 A g–1) and cycling performance (647.7 mAh
g–1 at 0.1 A g–1 after 100 cycles)
One-Step Urothermal Synthesis of Li<sup>+</sup>‑Intercalated SnS<sub>2</sub> Anodes with High Initial Coulombic Efficiency for Li-Ion Batteries
Tin sulfide, as a promising anode material for Li-ion
batteries,
suffers from high-capacity loss during cycling and low initial Coulombic
efficiency, which limits its further application. In order to solve
these problems, Li+-intercalated SnS2 with expanded
interlayer spacing (0.89 nm) was prepared by the one-step urothermal
method. The successful synthesis of Li+-intercalated SnS2 is confirmed by means of X-ray diffraction, scanning electron
microscopy, transmission electron microscopy, energy-dispersive X-ray
spectroscopy, inductively coupled plasma emission spectrometer test,
and exfoliation experiment. Compared with pure SnS2, the
Li+-intercalated SnS2 electrode displays a higher
initial Coulombic efficiency (79.3%) than the pure SnS2 electrode (55%). Also, Li+-intercalated SnS2 exhibits more excellent rate performance (548.4 mAh g–1 at 2 A g–1 and 216.6 mAh g–1 at 10 A g–1) and cycling performance (647.7 mAh
g–1 at 0.1 A g–1 after 100 cycles)
One-Step Urothermal Synthesis of Li<sup>+</sup>‑Intercalated SnS<sub>2</sub> Anodes with High Initial Coulombic Efficiency for Li-Ion Batteries
Tin sulfide, as a promising anode material for Li-ion
batteries,
suffers from high-capacity loss during cycling and low initial Coulombic
efficiency, which limits its further application. In order to solve
these problems, Li+-intercalated SnS2 with expanded
interlayer spacing (0.89 nm) was prepared by the one-step urothermal
method. The successful synthesis of Li+-intercalated SnS2 is confirmed by means of X-ray diffraction, scanning electron
microscopy, transmission electron microscopy, energy-dispersive X-ray
spectroscopy, inductively coupled plasma emission spectrometer test,
and exfoliation experiment. Compared with pure SnS2, the
Li+-intercalated SnS2 electrode displays a higher
initial Coulombic efficiency (79.3%) than the pure SnS2 electrode (55%). Also, Li+-intercalated SnS2 exhibits more excellent rate performance (548.4 mAh g–1 at 2 A g–1 and 216.6 mAh g–1 at 10 A g–1) and cycling performance (647.7 mAh
g–1 at 0.1 A g–1 after 100 cycles)
Ferroelectric Mesocrystals of Bismuth Sodium Titanate: Formation Mechanism, Nanostructure, and Application to Piezoelectric Materials
Ferroelectric mesocrystals of Bi<sub>0.5</sub>Na<sub>0.5</sub>TiO<sub>3</sub> (BNT) with [100]-crystal-axis
orientation were successfully
prepared using a topotactic structural transformation process from
a layered titanate H<sub>1.07</sub>Ti<sub>1.73</sub>O<sub>4</sub>·<i>n</i>H<sub>2</sub>O (HTO). The formation reactions of BNT mesocrystals
in HTO–Bi<sub>2</sub>O<sub>3</sub>–Na<sub>2</sub>CO<sub>3</sub> and HTO–TiO<sub>2</sub>–Bi<sub>2</sub>O<sub>3</sub>–Na<sub>2</sub>CO<sub>3</sub> reaction systems and
their nanostructures were studied by XRD, FE-SEM, TEM, SAED, and EDS,
and the reaction mechanisms were given. The BNT mesocrystals are formed
by a topotactic structural transformation mechanism in the HTO–Bi<sub>2</sub>O<sub>3</sub>–Na<sub>2</sub>CO<sub>3</sub> reaction
system and by a combination mechanism of the topotactic structural
transformation and epitaxial crystal growth in the HTO–TiO<sub>2</sub>–Bi<sub>2</sub>O<sub>3</sub>–Na<sub>2</sub>CO<sub>3</sub> reaction system, respectively. The BNT mesocrystals prepared
by these methods are constructed from [100]-oriented BNT nanocrystals.
Furthermore, these reaction systems were successfully applied to the
fabrication of [100]-oriented BNT ferroelectric ceramic materials.
A BNT ceramic material with a high degree of orientation, high relative
density, and small grain size was achieved
High Pseudocapacitance in FeOOH/rGO Composites with Superior Performance for High Rate Anode in Li-Ion Battery
Capacitive
storage has been considered as one type of Li-ion storage
with fast faradaic surface redox reactions to offer high power density
for electrochemical applications. However, it is often limited by
low extent of energy contribution during the charge/​discharge
process, providing insufficient influences to total capacity of Li-ion
storage in electrodes. In this work, we demonstrate a pseudocapacitance
predominated storage (contributes 82% of the total capacity) from
an in-situ pulverization process of FeOOH rods on rGO (reduced graphene
oxide) sheets for the first time. Such high extent of pseudocapacitive
storage in the FeOOH/​rGO electrode achieves high energy density
with superior cycling performance over 200 cycles at different current
densities (1135 mAh/g at 1 A/g and 783 mAh/g at 5 A/g). It is further
revealed that the in-situ pulverization process is essential for the
high pseudocapacitance in this electrode, because it not only produces
a porous structure for high exposure of tiny FeOOH crystallites to electrolyte but also maintains
stable electrochemical contact during ultrahigh rate charge transfer
with high energy density in the battery. The utilization of in-situ
pulverization in an Fe-based anode to realize high surface pseudocapacitance
with superior performance may inspire future design of electrode structures
in Li-ion batteries