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^–1 after 100 cycles at 300 mA g^–1. 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^–1, as well as a coulombic efficiency of nearly 99% at the current density of 130 mA g^–1 with a capacity density of 1.43 mAh cm^–2. High specific discharge capacities were maintained at different current densities (∼2224, ∼1895, ∼1642, and ∼1187 mAh g^–1_composite at 130, 260, 520, and 1300 mA g^–1, 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 LiFePO₄ Crystals and Defect Analysis

A solvothermal process was used to synthesize LiFePO₄ nanomaterials for lithium ion batteries. Reaction parameters such as reaction temperature and residence time were explored to obtain the optimal LiFePO₄ 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 LiFePO₄ 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 LiFePO₄ showed that the carbon-coated LiFePO₄ samples prepared at 180 °C after 4 h of solvothermal treatment had a discharge capacity of 160.6 mA h g^–1 at a discharge rate of 0.1C and 129.6 mA h g^–1 at 10C

Crystal Orientation Tuning of LiFePO₄ Nanoplates for High Rate Lithium Battery Cathode Materials

We report the crystal orientation tuning of LiFePO₄ nanoplates for high rate lithium battery cathode materials. Olivine LiFePO₄ nanoplates can be easily prepared by glycol-based solvothermal process, and the largest crystallographic facet of the LiFePO₄ nanoplates, as well as so-caused electrochemical performances, can be tuned by the mixing procedure of starting materials. LiFePO₄ nanoplates with crystal orientation along the <i>ac</i> facet and <i>bc</i> facet present similar reversible capacities of around 160 mAh g^–1 at 0.1, 0.5, and 1 C-rates but quite different ones at high C-rates. The former delivers 156 mAh g^–1 and 148 mAh g^–1 at 5 C-rate and 10 C-rate, respectively, while the latter delivers 132 mAh g^–1 and only 28 mAh g^–1 at 5 C-rate and 10 C-rate, respectively, demonstrating that the crystal orientation plays important role for the performance of LiFePO₄ nanoplates. This paves a facile way to prepare high performance LiFePO₄ 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

Lithium-Induced Covalent Organic Frameworks with Enhanced Sorption Heat for Efficient Hydrogen Storage

Covalent organic frameworks (COFs) possess high surface areas and tunable pore structures and are promising candidates for H2 physisorption materials. However, their interaction with H2 molecules is too weak to take advantage of the high porosity of the COFs. Here, we report the first example of metal-doped enhanced H2-physisorption COF. By leveraging the superior stability of TPB-DMTP-COF, we can well preserve the porosity of the COF after lithium (Li) doping, yielding a surface area of 1350 m2/g. Due to the Li-doping-enhanced H2 isosteric heat, the material’s total H2 uptake increased from 4.98 to 6.91 wt % at 77 K and 80 bar. The Li-doping-induced enhancement effect does not involve chemisorption, and the material shows excellent cycling performance: 10 cycles at 30 bar with a capacity retention of 99%. Our results reveal that tuning H2 adsorption heat by postmodification is a promising strategy to exploit the potential of porous materials for efficient H2 storage

Investigation of the Degradation of LiPF₆^– in Polar Solvents through Deep Potential Molecular Dynamics

The nonaqueous electrolyte based on lithium hexafluorophosphate (LiPF6) is the dominant liquid electrolyte in lithium-ion batteries (LIBs). However, trace protic impurities, including H3O+, alcohols, and hydrofluoric acid (HF), can trigger a series of side reactions that lead to rapid capacity fading in high energy density LIBs. It is worth noting that this degradation process is highly dependent on the polarity of the solvents. In this work, a deep potential (DP) model is trained with a certain commercial electrolyte formula through a machine learning method. H3O+ is anchored with polar solvents, making it difficult to approach the PF6–, and suppressing the degradation process quickly at room temperature. Control experiments and simulations at different temperatures or concentrations are also performed to verify it. This work proposes a precise model to describe the solvation structure quantitatively and offers a new perspective on the degradation mechanism of PF6– in polar solvents

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 Al³⁺ from the aluminum foil. This new reaction mechanism can also shed light on the dissolution of transitional metal at high potentials