7 research outputs found
Effect of Pore Size Distribution of Carbon Matrix on the Performance of Phosphorus@Carbon Material as Anode for Lithium-Ion Batteries
Phosphorus@carbon composites are
alternative anode materials for
lithium-ion batteries due to their high specific capacity. Serving
as a conductive and buffer matrix, the carbon substrate is important
to the performance of the composite. Our results exhibit that the
electrochemical performances of phosphorus@carbon composites could
be significantly enhanced by pore size distributions of the carbon
matrix. The initial Coulombic efficiency of phosphorus@YP-50F reaches
80% and the capacity remains stable at 1370 mAh g<sup>–1</sup> after 100 cycles at 300 mA g<sup>–1</sup>. The work may provide
a general strategy for designing or selecting the optimal carbon matrix
for phosphorus@carbon performance, and pave the way to practical application
in lithium-ion batteries
Economic and High Performance Phosphorus–Carbon Composite for Lithium and Sodium Storage
Porous carbon derived from rice hulls
has potential for application
in phosphorus–carbon composites as high capacity anode materials
for lithium-ion and sodium-ion batteries. The native composition of
rice husks produces a porous carbon with a unique doped structure,
as well as an efficient pore and channel structure, which may facilitate
high and stable lithium storage. After cycling for over 100 cycles,
the composite delivered a capacity of about 1293 mAh g<sup>–1</sup>, as well as a coulombic efficiency of nearly 99% at the current
density of 130 mA g<sup>–1</sup> with a capacity density of
1.43 mAh cm<sup>–2</sup>. High specific discharge capacities
were maintained at different current densities (∼2224, ∼1895,
∼1642, and ∼1187 mAh g<sup>–1</sup><sub>composite</sub> at 130, 260, 520, and 1300 mA g<sup>–1</sup>, respectively).
This study may offer a golden opportunity to change the humble fate
of rice hulls, and also pave the way toward successful battery application
for phosphorus–carbon composite anode materials
Reaction Mechanisms on Solvothermal Synthesis of Nano LiFePO<sub>4</sub> Crystals and Defect Analysis
A solvothermal process was used to
synthesize LiFePO<sub>4</sub> nanomaterials for lithium ion batteries.
Reaction parameters such
as reaction temperature and residence time were explored to obtain
the optimal LiFePO<sub>4</sub> sample. A three-stage reaction mechanism
is proposed to better understand the solvothermal synthesis process.
X-ray diffraction, scanning electron microscopy, and Fourier transform
IR spectroscopy were used to investigate the prepared samples under
different conditions. The LiFePO<sub>4</sub> formation reaction occurred
at a temperature as low as 89 °C. Defect analysis results showed
that after 4 h of solvothermal treatment the concentration of lithium
vacancy and Li–Fe antisite defects was too low to be detected.
The charge–discharge data of the obtained LiFePO<sub>4</sub> showed that the carbon-coated LiFePO<sub>4</sub> samples prepared
at 180 °C after 4 h of solvothermal treatment had a discharge
capacity of 160.6 mA h g<sup>–1</sup> at a discharge rate of
0.1C and 129.6 mA h g<sup>–1</sup> at 10C
Crystal Orientation Tuning of LiFePO<sub>4</sub> Nanoplates for High Rate Lithium Battery Cathode Materials
We report the crystal orientation tuning of LiFePO<sub>4</sub> nanoplates
for high rate lithium battery cathode materials. Olivine LiFePO<sub>4</sub> nanoplates can be easily prepared by glycol-based solvothermal
process, and the largest crystallographic facet of the LiFePO<sub>4</sub> nanoplates, as well as so-caused electrochemical performances,
can be tuned by the mixing procedure of starting materials. LiFePO<sub>4</sub> nanoplates with crystal orientation along the <i>ac</i> facet and <i>bc</i> facet present similar reversible capacities
of around 160 mAh g<sup>–1</sup> at 0.1, 0.5, and 1 C-rates
but quite different ones at high C-rates. The former delivers 156
mAh g<sup>–1</sup> and 148 mAh g<sup>–1</sup> at 5 C-rate
and 10 C-rate, respectively, while the latter delivers 132 mAh g<sup>–1</sup> and only 28 mAh g<sup>–1</sup> at 5 C-rate
and 10 C-rate, respectively, demonstrating that the crystal orientation
plays important role for the performance of LiFePO<sub>4</sub> nanoplates.
This paves a facile way to prepare high performance LiFePO<sub>4</sub> nanoplate cathode material for lithium ion batteries
sj-pdf-1-onc-10.1177_11795549231195293 – Supplemental material for The Value of Neoadjuvant Anthracycline-Based Regimens for HER2-Positive Breast Cancer: A Systematic Review and Meta-analysis Including 1366 Patients
Supplemental material, sj-pdf-1-onc-10.1177_11795549231195293 for The Value of Neoadjuvant Anthracycline-Based Regimens for HER2-Positive Breast Cancer: A Systematic Review and Meta-analysis Including 1366 Patients by Yuqin Ding, Kaijing Ding, Xiangming He, Wenju Mo, Chenlu Liang, Lijie Gong, Yuting Huang and Xiaowen Ding in Clinical Medicine Insights: Oncology</p
Additional file 1 of LncRNA TDRKH-AS1 promotes breast cancer progression via the miR-134-5p/CREB1 axis
Additional file 1: Figure S1. Spearman correlation analysis revealed the correlation between TDRKH-AS1 and potential miRNA targets
Revisiting the Corrosion of the Aluminum Current Collector in Lithium-Ion Batteries
The
corrosion of aluminum current collectors and the oxidation
of solvents at a relatively high potential have been widely investigated
with an aim to stabilize the electrochemical performance of lithium-ion
batteries using such components. The corrosion behavior of aluminum
current collectors was revisited using a home-build high-precision
electrochemical measurement system, and the impact of electrolyte
components and the surface protection layer on aluminum foil was systematically
studied. The electrochemical results showed that the corrosion of
aluminum foil was triggered by the electrochemical oxidation of solvent
molecules, like ethylene carbonate, at a relative high potential.
The organic radical cations generated from the electrochemical oxidation
are energetically unstable and readily undergo a deprotonation reaction
that generates protons and promotes the dissolution of Al<sup>3+</sup> from the aluminum foil. This new reaction mechanism can also shed
light on the dissolution of transitional metal at high potentials