3 research outputs found
Aerobic Oxidative Coupling of 2‑Naphthol Derivatives Catalyzed by a Hexanuclear Bis(μ-hydroxo)copper(II) Catalyst
A novel hexanuclear bisÂ(μ-hydroxo)ÂcopperÂ(II)
complex, [<b>L</b><sub>3</sub>(Cu<sub>2</sub>(μ-OH)<sub>2</sub>)<sub>3</sub>]Â(ClO<sub>4</sub>)<sub>6</sub> (<b>1</b>), was synthesized
with dinucleating ligand <i>N</i>,<i>N</i>,<i>N</i>,<i>N</i>-tetraÂ(pyridin-2-ylmethyl)-<i>m</i>-xylene diamine (<b>L</b>). Complex <b>1</b> is fully
characterized by X-ray crystallography and magnetic susceptibility
in the solid state and UV–vis and electron paramagnetic resonance
spectroscopy in solution. The molecular structure of <b>1</b> possesses three dicopper cores, in which two copper centers are
bridged by two hydroxide groups and separated by a distance ranging
from 2.8852(15) to 2.8937(10) Ã…. In addition, the three dicopper
cores are linked by the dinucleating ligand between each pair of adjacent
dicopper cores. Importantly, aerobic oxidative coupling of 2,4-di-<i>tert</i>-butylphenol, 2-naphthol, and six 2-naphthol derivatives
was achieved in 33–96% yield using complex <b>1</b> as
a catalyst
An efficient multi-doping strategy to enhance Li-ion conductivity in the garnet-type solid electrolyte Li7La3Zr2O12
Lithium-ion (Li + ) batteries suffer from problems caused by the chemical instability of their organic electrolytes. Solid-state electrolytes that exhibit high ionic conductivities and are stable to lithium metal are potential replacements for flammable organic electrolytes. Garnet-type Li 7 La 3 Zr 2 O 12 is a promising solid-state electrolyte for next-generation solid-state Li batteries. In this study, we prepared mono-, dual-, and ternary-doped lithium (Li) garnets by doping tantalum (Ta), tantalum-barium (Ta-Ba), and tantalum-barium-gallium (Ta-Ba-Ga) ions, along with an undoped Li 7 La 3 Zr 2 O 12 (LLZO) cubic garnet electrolyte, using a conventional solid-state reaction method. The effect of multi-ion doping on the Li + dynamics in the garnet-type LLZO was studied by combining joint Rietveld refinement against X-ray diffraction and high-resolution neutron powder diffraction analyses with the results of Raman spectroscopy, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and multinuclear magic angle spinning nuclear magnetic resonance. Our results revealed that Li + occupancy in the tetrahedrally coordinated site (24d) increased with increased multi-ion doping in LLZO, whereas Li + occupancy in the octahedrally coordinated site (96h) remained constant. Among the investigated compounds, the ternary-doped garnet structure Li 6.65 Ga 0.05 La 2.95 Ba 0.05 Zr 1.75 Ta 0.25 O 12 (LGLBZTO) exhibited the highest total ionic conductivity of 0.72 and 1.24 mS cm -1 at room temperature and 60 °C, respectively. Overall, our findings revealed that the dense microstructure and increased Li + occupancy in the tetrahedral-24d Li1 site played a key role in achieving the maximum room-temperature Li-ion conductivity in the ternary-doped LGLBZTO garnet, and that the prepared ternary-doped LGLBZTO was a potential solid electrolyte for Li-ion batteries without polymer adhesion
All-Solid-State Li-Ion Battery Using Li<sub>1.5</sub>Al<sub>0.5</sub>Ge<sub>1.5</sub>(PO<sub>4</sub>)<sub>3</sub> As Electrolyte Without Polymer Interfacial Adhesion
Solid-state
lithium-ion batteries are promising candidates for
energy storage devices that meet the requirements to reduce CO<sub>2</sub> emissions. NASICON-type solid-state electrolytes (SSE) are
most promising materials as electrolytes for high-performance lithium
ion batteries because of their good stability and high ionic conductivity.
In this study, we successfully fabricate NASICON-based Li<sub>1.5</sub>Al<sub>0.5</sub>Ge<sub>1.5</sub>(PO<sub>4</sub>)<sub>3</sub> lithium
fast-ion conductors through melt-quenching with post-crystallization.
The effect of crystallization temperature on the structure of LAGP
and their ionic conductivity is systematically studied using Rietveld
analysis of Synchrotron X-ray powder diffraction patterns, multinuclear
magnetic resonance, and electrochemical analysis, revealing that the
mobility of Li ion is dependent on crystallization temperature. The
glass–ceramic LAGP annealed at 800 °C for 8 h exhibits
the highest conductivity of 0.5 mS cm<sup>–1</sup> at room
temperature. Moreover, we report the viability of the prepared LAGP
glass−ceramic as a solid electrolyte in Li-ion batteries without
polymer adhesion. The cycling of Li/LAGP/LFP all-solid-state cell,
provides a stable cycling lifetime of up to 50 cycles. This approach
demonstrates that LAGP glass–ceramic can have good contact
with the electrodes without interfacial layer and can deliver a reasonable
discharge capacity after 50 cycles