Journal of Environmental Chemical Engineering
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2025
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IF 7.2
Chengjia Dan,Yue Wang,Daikuan Huang,Yang Cao,Dabin Zhang
Leakages of electrolytic manganese slag (EMS) disposal sites pose a significant threat to soil and groundwater, necessitating effective in situ remediation technologies. This study presents a multi-scale analysis to elucidate the enhanced impermeability mechanism of EMS composite modified by sodium polyacrylate (PAAS). By integrating macroscopic performance testing (compressive strength, permeability, corrosion resistance, and pollutant leaching), molecular dynamics (MD) simulations, and advanced spectroscopic/microscopic techniques (FTIR, XPS, and EDS mapping), we establish a direct link between macroscopic properties and underlying molecular-level interactions. Results demonstrate that an optimal PAAS/EMS mass ratio of 0.2 significantly enhances compressive strength (12.3-fold increase), reaching 2.78 MPa, and reduces the permeability coefficient to 1.318 × 10 −8 cm/s, with leachate concentrations meeting relevant water quality standards. This performance improvement stems from a synergistic multi-scale effect: macroscopically, well-dispersed PAAS forms a crosslinked network, filling structural defects within the EMR matrix and encapsulating the CaSO 4 ·2 H 2 O hard phase; at the molecular level, MD simulations reveal that PAAS chains undergo ion exchange (Na + with Mn 2+ ) and chelation (between -COO - and Mn 2+ ), forming a multi-crosslinked polymer network that densifies the microstructure and effectively impedes contaminant migration. FTIR and XPS analyses corroborate these molecular interactions, confirming that the enhanced impermeability arises from the synergistic effects of polymerization, ion exchange, and chelation. This study provides a new approach for controlling environmental risks associated with EMS, demonstrating the efficacy of multi-scale analysis in optimizing material performance.
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高影响因子
Journal of Energy Storage
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2025
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IF 9.8
Susu Chen,Mengjun Li,Liyang Lin,Zhen Wei,Ning Hu
Silicon's potential as a lithium-ion battery anode material is greatly constrained by its pronounced volume changes during cycling and inherently poor electrical conductivity. Although strategies like nanosizing silicon particles and applying carbon coatings offer partial improvements, fundamental issues including particle agglomeration and structural degradation during operation remain unresolved. In this study, leveraging the synergistic interplay between gelatin (GE) and sodium alginate (SA), we engineered a nitrogen-doped Si@rGO@GS via a seamlessly integrated route of liquid-phase synthesis, electrostatic self-assembly, freeze-drying, and thermal annealing. Silicon nanoparticles (Si NPs) were uniformly embedded within a hierarchically porous, three-dimensional nitrogen-doped carbon framework. The Si@rGO@GS composite electrode demonstrated superior electrochemical performance: achieving a maximum specific capacity of 1851 mAh g −1 at 0.1 A g −1 and maintaining 423 mAh g −1 even at a high current density of 2 A g −1 . Additionally, after 100 cycles at 1 A g −1 , the composite retained a reversible capacity of 548 mAh g −1 with an impressive capacity retention rate of 78.8 %. The cooperative interaction between rGO and biomass-derived carbon suppressed particle agglomeration and stabilized the carbon‑silicon interface, positioning the composite as a highly promising anode for lithium-ion batteries.
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高影响因子
FUEL
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2025
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IF 7.5
Qinghui Yan,Min Wu,Huafeng Zhou,Haoshen Huang,Zhengfei Chen,Haiyong He,Zixuan Liu
Lithium-air batteries (LABs) are highly attractive for their highest energy density among all energy storage systems, but the high reactivity and volumetric variation of lithium metal anode (LMA), as well as the inter-electrode crosstalk (shuttling) by soluble species, e.g. redox mediators (RMs), impose arduous challenges for their practicality. Traditional countermeasures such as LMA protecting structures and solid-state electrolytes (SSEs) increase heft, complexity and cost, diminishing LAB’s core advantage—the ultrahigh energy density. In this work, a high-capacity (1750 mAh g -1 SCC ) silicon-carbon composite (SCC) material was synthesized and used as the anode in a Li-ion air battery, exhibiting superior cyclability (86 cycles under 300 mAh g -1 carbon ) compared to that with LMA (61 cycles), and physical characterizations revealed no deposition of RM on the SCC anode despite the absence of SSEs to prevent shuttling, demonstrating their excellent compatibility. This work showcases the prospects of silicon-based anodes to address LABs’ anode stability issue and improve cell cyclability while retaining most of the energy density.
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高影响因子
ELECTROCHIMICA ACTA
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2025
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IF 5.6
Xiaomei Chen,Yuefeng Wu,Yanpeng Wang,Zezhong Li,Yusheng Luo,Yongcheng Jin,Xiaolin Che,Wei Liu
Silicon anodes hold great promise for high-energy lithium-ion batteries but suffer from severe volume expansion and unstable solid electrolyte interphase (SEI) formation. To address these challenges, this study develops a thermally crosslinked dual-polymer (KH550/sodium alginate) coating strategy. The 350 °C-pyrolyzed coating forms a semi-carbonized artificial SEI on the surface of Si particles that effectively suppresses side reactions and accommodates volume changes. Comparing with uncarbonized polymer coating, the denser semi-carbonized one demonstrates its unique effect in matching Li⁺ diffusion kinetics between the interface and bulk silicon, retaining the structural integrity of Si particles during lithiation. The resulting Si anode exhibits minimal volume expansion (8%), 82.5% initial Coulombic efficiency, 948 mAh g⁻¹ after 500 cycles at 2 A g⁻¹, thereby developing a new gate on enhancing electrochemical performance by pre-constructing semi-carbonized polymer coating around Si particles.
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高影响因子
危险品化学品经营许可证（带存储）