POWDER TECHNOLOGY
·
2018
·
IF 3.23
Yonggai Li,Jiawei Li,Peng Chen,Jianzhong Chen,Lijuan Shen,Xiangnan Zhu,Gan Cheng
In this study, X-ray Photoelectron Spectroscopy (XPS) was used to analyze the elements on the surface of subbituminous coal , and reverse flotation was introduced to float subbituminous coal. The effect of ultra-fine coal on the flotation behavior of silica in coal reverse flotation was discussed by comparing the flotation performance with two different artificial mixed flotation feedings, with ultra-fine coal (UFC, −45 μm) or without ultra-fine coal. The comparison results showed that the existence of UFC reduced the flotation rate and the recovery of silica, as well as the separation efficiency of subbituminous coal reverse flotation. Compared to the flotation performance of feeding with UFC, the concentrate ash content of feeding without UFC was lower (9.18%), and the separation efficiency was higher (68.69%). Total Organic Carbon Analyzer was used to test the adsorption quantity of collector by coal and silica to explain the mechanism. Conclusions were obtained that ultra-fine coal particles could adsorb more collector due to their larger specific surface area, leading to less collector left in the pulp to float silica particles. Selective flocculation reverse flotation method could increase the separation efficiency of coal reverse flotation with appropriate dosage flocculant .
研究领域:
矿物加工工程
·
煤炭科学与技术
✓ 已验证
产品关联
DOI
高影响因子
JOM
·
2021
·Vol. 74
·期 1
·195-202
·
IF 2.474
Xia Longgong,Yu Zhiqian,Xu Gexiong,Liu Zhihong
Arsenic monitoring is a critical issue in the copper-making industry, and its removal at the fire-refining stage is important. However, arsenic is poorly removed in the traditional fire-refining practices. A new “As enrichment—targeted oxidation—slag modifying” process is proposed and experimentally studied in this work. The results showed: (1), arsenic can be readily enriched by the Cu-Pb liquid alloy phase which helps the subsequent oxidation removal; (2), SiO 2 and NaHCO 3 were used as fluxes in the four-phase fire-refining process (Cu phase/Cu-Pb alloy phase/slag phase/gas phase). Fe, S, and Pb could be easily removed, and the removal efficiencies of As, Sb, and Bi were clearly improved; and (3) when treating a crude copper with 0.45 wt.% As under optimized conditions, 93.6% Cu was recovered, and the removal efficiencies of As, Sb, and Bi were 33.2%, 57.7%, and 48.6%, respectively.
研究领域:
冶金工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 17
·4108
·
IF 4.2
Jintao Yao,Guangzhao Zhu,Jingrui Huang,Xiaoru Meng,Maolong Hao,Shoupu Zhu,Zhen Wu,Fanxu Kong,Yue Zhou,Qi Li,Guowang Diao
Commercial graphite anode has advantages such as low potential platform, high electronic conductivity, and abundant reserves. However, its theoretical capacity is only 372 mA h g−1. High-energy lithium-ion batteries have been a research hotspot. The Si anode has an extremely high specific capacity, but its application is hindered by defects such as large volume changes, poor electronic conductivity, and a small lithium-ion diffusion coefficient. Here, the Si/thermally reduced graphite oxide@carbon (Si/RGtO@C) composite was fabricated by electrostatic self-assembly followed by thermal treatment. The RGtO synergistic carbon coating layer can effectively compensate for the low electronic conductivity and buffer the volume expansion effect of the Si nanoparticles during charge/discharge cycles. The Si/RGtO@C anode demonstrated a significantly increased capacity compared to the RGtO. After 300 cycles, Si/RGtO@C kept a discharged capacity of 367.6 mA h g−1at a high current density of 1.0 A g−1. The Si/RGtO@C anode shows an application potential for commercial high-energy lithium-ion batteries.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Cell Reports Physical Science
·
2023
·
IF 8.9
Xiangyu Lin,Le Yu,Yong Wen,Luhe Qi,Shanshan Wang,He Liu,Xu Xu,Chaoji Chen
Co-utilization of silicon (Si) and graphite (Gr) has become a commercially viable route to achieve higher energy density before the realization of pure Si anodes. However, the challenges of poor dispersion in the aqueous binder and structural stability faced with Si/Gr remain difficult to negotiate. Herein, inspired by the outstanding adhesive ability of pyrogallol-containing proteins in tunicates, a water-soluble binder polyvinyl alcohol-gallic acid (PVA-GA) is synthesized via a one-step esterification reaction. Multiple supramolecular interactions of π−π stacking and hydrogen bonding are introduced to favor the homogeneous distribution of Si/Gr and the excellent structural stability of Si/Gr electrodes. The Si/Gr-PVA-GA delivers a high specific capacity of 568.6 mAh g −1 over 200 cycles, corresponding to 91.5% capacity retention and 0.038% capacity loss per cycle. Furthermore, the good practicality is demonstrated by the stable and safe operation of a Si/Gr||LiNi 0.6 Mn 0.2 Co 0.2 O 2 full cell with a practical level of areal capacity up to 3 mAh cm −2 .
研究领域:
材料科学
·
能源化学
·
生物仿生学
✓ 已验证
DOI
高影响因子
CARBON
·
2025
·
IF 11.6
Xin Xue,Bin Lou,Weiwei Pang,Shuang Han,Jichang Zhang,Jing Wu,Lingyan Tian,Nan Shi,Dong Liu
In silicon-graphite composite electrodes, the disparity in lithiation potentials between the two components exacerbates the polarization of individual components during charge/discharge processes, consequently diminishing the rate performance of the electrode materials. A robust silicon-defective carbon-graphite interface was created by coating graphite with oxidized pitch and employing surface-bonding techniques, significantly improving the rate performance and overall homogeneity of the electrode materials. The synthesized sample Si@C-MCMB exhibited the specific capacity of around 1617mAh/g at 0.1 A/g with the capacity retention of more than 85 %. In-situ XRD tests and DFT calculations reveal that due to the lower lithiation potential of graphite, it experiences a delayed discharge process within the composite anode, causing silicon to discharge independently during the initial stages of lithiation. However, the broad voltage window of defective carbon could compensate for the independent discharge behavior of silicon, promoting the homogeneity of the electrode. The faster lithium-ion diffusion in defective carbons with small graphite microcrystals and abundant defect sites also enhances the overall rate performance of the electrode materials. The study highlights using defective carbon to enhance Si-graphite composite electrodes for better battery performance, suggesting future research on optimizing the silicon-carbon interface and other carbon-based materials.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Zhaojin Li,Conghao Shi,Pengfei Liu,Yunbo Di,Di Zhang,Qiujun Wang,Huilan Sun,Qujiang Sun,Bo Wang
At present, silicon/graphite composite is the most promising anode material for high energy density lithium-ion batteries. However, during the preparation, nanoscale silicon will inevitably undergo agglomeration, which will cause serious volume changes and breakage during the charging/discharging process. How to achieve uniform dispersion of nanoscale silicon onto the surface of graphite becomes a great challenge. Here, by grafting functional groups on the surface of silicon, both the repulsive force between silicon particles and the binding force between silicon/graphite have been improved, thereby highly uniform dispersed silicon is achieved. After being coated with asphalt and etching off the functional groups, the conductivity and ion migration ability of the composite are further improved. Resultantly, the modified composite provides a high discharging capacity of 598.4 mAh·g −1 at 0.2C and can still maintain a high-capacity retention of 90.7 % and a small volume expansion rate of 30.8 % after 500 cycles.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2020
·
IF 8.247
Zhen Luo,Ying Xu,Cui-Ran Gong,Yang-Qing Zheng,Zhao-Xi Zhou,Li-Ming Yu
Urushiol monomers , which are used as a new ultraviolet curable binder (Ur Binder), have been directly applied to prepare silicon/graphite electrodes of lithium batteries . Investigations show that the Ur Binder is conducive to the preparation of uniform electrode slurry and the formation of uniform electrode coating layer, which makes a close contact between electrochemical active materials and conductive carbon. Besides that, strong interaction between the polymer of the Ur Binder and silicon powders plays a key role in the long-cycling lithium battery. Lithium coin cells using the Ur Binder achieve a capacity of 603.3 m Ah g −1 and excellent capacity retention of 96.1% after 400 cycles. Even at a high current density of 2.0C, the coin cell with the Ur Binder maintains approximately 77.9% of its original capacity (0.2C rate). Notably, slurry containing the Ur Binder can be superimposed on copper foil for coating and curing, which helps to relieve the low capacity limitations of ultraviolet curable silicon/graphite electrodes for commercial applications.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2018
·Vol. 29
·期 10
·2674-2682
·
IF 2.137
Yanping Wu,Jia Dong,Rui Yuan,Hongqi Wan,Lei Chen,Jinlong Li,Huidi Zhou,Jianmin Chen
Solution styrene butadiene and butadiene rubber (SSBR-BR) composites reinforced with different contents of SiO 2 -graphene have been fabricated firstly. The mechanical properties of the rubber composites were comparatively investigated using tensile tests; experimental results showed that, as an overall trend, the tensile and tear strength increased with increasing contents of SiO 2 -graphene. Most importantly, under the condition of simulating practical working condition, the tribological behavior of SSBR-BR composites with different contents of SiO 2 -graphene was explored via a universal ring-plate frictional tester in detail. Combined with the surface roughness of the counterparts, the wear mechanisms were discussed for SSBR-BR composites under the cement and asphalt counterparts. Finally, several wear mechanisms under different actual working conditions were proposed.
研究领域:
材料科学
·
摩擦学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Xu Liu,Xinghao Sun,Xixi Shi,Dawei Song,Hongzhou Zhang,Chunliang Li,Kai-Yao Wang,Chengwei Xiao,Xizheng Liu,Lianqi Zhang
Lithium ion batteries (LIBs) with Si/graphite composites anode promise a high energy density larger than 400 Wh kg −1 with low costs, however, they still suffer from rapid performance degradation and potential safety hazard at cold climate. This is mainly associated with the fragile solid electrolyte (SEI) layer and the formation of Li dendrite. Here, we report on designing of electrolyte additives which endows a capacity retention of 66.7% over 200 cycles and an excellent rate performance with Si (10 wt%)/graphite composite anode. Moreover, the initial coulombic efficiency (CE) achieves 87% and rapidly approaches 100% in the 2nd cycle. The high-ductility organic/inorganic solid electrolyte interfaces (SEI) layer, which is composed by ROSO 2 Li and LiF, contribute to the enhanced performance. The introduction of Diethyl Sulfite (DES) promotes the rapid defluorination of Fluoroethylene carbonate (FEC) and polymerization of sulfide to form the organic layer during the initial discharging. Our results provide a facile but practical method to enhance the low-temperature performance and prove the way of commercial LIBs which could be operated at cold climate.
研究领域:
材料科学
·
电化学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Tongtong Zhang,Yukun Zhang,Chong Chen,Yukun Tian,Yunlong Wang,Shuiyan Cao,Jun Ma
The development of an effective approach to fabricating superior anti-corrosion epoxy resin-based coating has long been a desirable goal in the steel industry, but many challenges remained. Herein, we fabricated a SiO 2 -graphene oxide filled silane-treated resin (SiO 2 -GO/HEP) coating with a protection efficiency of ∼99.995 % via an electron beam (EB) curing technology. The complete curing took <1 min at room temperature. The corrosion voltage and corrosion current density of synthetic SiO 2 -GO/HEP coating achieved −0.2 V and 2.1 × 10 −9 A·cm −2 , respectively. The impedance modulus was increased by 4 orders of magnitude compared with pure epoxy coating. Our findings demonstrated that replacing conventional UV curing with EB curing significantly reduced the current density from 2 × 10 −7 A·cm −2 to 2.1 × 10 −9 A·cm −2 , and the water absorption rate decreased from 1.05 % to 0.13 %. As a result, our combined strategy provided a new and efficient anticorrosion nanocomposite structure, advancing the EB curing technology.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
IONICS
·
2023
·Vol. 29
·期 3
·951-961
·
IF 2.8
Qi Jiawei,Yu Xiaobo,Chen Bingshuai,Zhuo Haitao,Chen Shaojun
Si/Gr anodes have high specific capacity but their cycle stability is not ideal due to excessive volume expansion during discharge/charge cycling, thereby limiting the commercialization of lithium-ion batteries (LIBs). In this paper, a chitosan-polyvinyl alcohol (CS-PVA) water-based binder was prepared. Unlike conventional one-dimensional structural adhesives, CS-PVA adhesives are rich in hydroxyl and amino polar groups. The polar groups induced interactions with Si–OH on silicon particles, further enhancing the structural stability of Si/Gr anode to maintain long-term stable cycling of LIBs. In addition, the Si/Gr anode formed a stable solid electrolyte interface (SEI) during the activation process, leading to long-term stable cycling Si/Gr anodes. The first Coulomb efficiency of Si/Gr@PC11 anode reached 85.5%. And at the current density of 0.5C, the discharge capacity stabilized at 505mAh g −1 after 200 cycles, and reached 433mAh g −1 after 500 cycles. In summary, the success of this work provides a promising avenue to develop high-capacity lithium battery packs with extended cycle life.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Helin Wang,Weiwei Wu,Qiurong Jia,Ting Liu,Fu Liu,Min Zhang,Miao Bai,Shaowen Li,Xiaoyu Tang,Bin Gan,Yue Ma
The Si anodes suffer from the repetitive buildup of the solid electrolyte interphase, electrode pulverization upon the lithiation/delithiation process, as well as the Li trapping in the alloy intermediates. Herein, a facile electrostatic self-assembly process of the Si nanosheets (SiNS) and graphite microsheets (GMs) is proposed as a viable high-capacity composite anode. Upon the appropriate interfacial tailoring, the SiNS/GMs composite not only guarantees the intimate contact mode between the sand-milled Si nanosheets and the positively charged graphite sheets but also renders the enhanced electrode conductivity and high-rate performance (886.2 mAh g–1 at current density of 5 A g–1). In addition, the prelithiated SiNS/GMs (Pre-SiNS/GMs) are fabricated by spraying stabilized lithium metal powder (SLMP) at the predetermined amounts onto the electrodes, contributing to the improved initial Coulombic efficiency (ICE) of the half cell (99%). As the Pre-SiNS/GMs anodes are assembled with the diverse commercial cathodes, the full cell models reveal the balanced cycling endurance and the high gravimetric energy/power densities.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
电池技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）