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Bi nanoparticles encapsulated in nitrogen-doped carbon as a long-life anode material for magnesium batteries

Journal of Magnesium and Alloys 2023年第11期11卷 4181-4188页

作者： Junjun Wang Ruohan Yu Jianxiang Wang Juncai Long Fan Qiao Lei Zhang Guanjie He Qinyou An Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China Christopher Ingold Laboratory Department of ChemistryUniversity College London20 Gordon StreetLondon WC1H 0AJUnited Kingdom of Great Britain and Northern IrelandUnited Kingdom Hubei Longzhong Laboratory Wuhan University of Technology(Xiangyang Demonstration Zone)Xiangyang 441000China

Bismuth has garnered significant interest as an anode material for magnesium batteries(MBs) because of its high volumetric specific capacity and low working potential. Nonetheless, the limited cycling performance(≤100 cycles) limits the practical application of Bi as anode for MBs. Therefore, the improvement of Bi cycling performance is of great significance to the development of MBs and is also full of challenges. Here, Bi nanoparticles encapsulated in nitrogen-doped carbon with single-atom Bi embedded(Bi@NC) are prepared and reported as an anode material for MBs. Bi@NC demonstrates impressive performance, with a high discharge capacity of 347.5 mAh g^(-1) and good rate capability(206.4 mAh g^(-1)@500 mA g^(-1)) in a fluoride alkyl magnesium salt electrolyte. In addition, Bi@NC exhibits exceptional long-term stability, enduring 400 cycles at 500 mA g^(-1). To the best of our knowledge, among reported Bi and Bi-based compounds for MBs, Bi@NC exhibits the longest cycle life in this work. The magnesium storage mechanism of Bi@NC is deeply studied through X-ray diffraction, transmission electron microscopy and X-ray photoelectron spectroscopy. This work provides some guidance for further improving the cycling performance of other alloy anodes in MBs.

关键词： Magnesium batteries Bismuth 3D tomography reconstruction Magnesium alloy Single-atom

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Optimization design of three-phase common box GIS double-break disconnector based on NSGA-II algorithm and improved BP neural network 9

Optimization design of three-phase common box GIS double-bre...

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9th International Conference on Energy System, Electricity, and Power, ESEP 2024

作者： Li, Jinbin Ren, Jieshuai Zhang, Hongrui Yuan, Zhao Chen, Jun Wen, Yaqin Electric Power Research Institute State Grid Hubei Electric Power Co. Ltd. Wuhan 430077 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Elec-tronic Engineering Huazhong University of Science and Technology Wuhan 430074 China

ISBN: (纸本)9781510691728

The GIS double-break isolator switch features design characteristics such as miniaturization and compactness. Compared to traditional isolators, it faces more stringent challenges in terms of electrical insulation, structural strength under pressure, and temperature rise performance. Therefore, optimizing core dimension parameters within limited space to enhance its insulation, pressure resistance, and temperature rise performance is of great significance. To this end, finite element methods were employed to establish simulation models for the GIS electrostatic field, stress field, and temperature field, which were subsequently analyzed to identify key optimization locations and dimensional parameters. In order to handle the large computational load involved in the optimization of the field models, while balancing both solution accuracy and computational efficiency, a Box-Behnken experimental design strategy was used for data sample collection, and a GA-BP neural network model was developed. By integrating the neural network model with the NSGA-II algorithm, a global optimal solution set and the corresponding optimal values were identified under multi-objective conditions. After optimization of the core dimension parameters of the isolator switch, the field distributions at critical locations were significantly improved, resulting in a notable enhancement in the overall performance of the double-break isolator switch. © 2025 SPIE.

关键词： BP neural network Double-break disconnector electrostatic field NSGA-II algorithm stress field

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Interface-induced polymerization strategy for constructing titanium dioxide embedded carbon porous framework with enhanced chemical immobilization towards lithium polysulfides

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Nano Research 2024年第3期17卷 1473-1481页

作者： Yue Ouyang Xiaoxiao Li Jiexin Zhu Wei Zong Yuhang Dai Xuan Gao Wei Zhang Shengyuan Yang Roohollah Bagherzadeh Feili Lai Yue-E Miao Tianxi Liu State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua University2999 North Renmin RoadShanghai 201620China The Key Laboratory of Synthetic and Biological Colloids Ministry of EducationSchool of Chemical and Material EngineeringJiangnan UniversityWuxi 214122China Advanced Fibrous Materials LAB Institute for Advanced Textile Materials and Technologies(ATMT)School of Advanced Materials and ProcessesAmirkabir University of TechnologyTehran 15914Iran Christopher Ingold Laboratory Department of ChemistryUniversity College London20 Gordon StreetLondon WC1H 0AJUK Department of Chemistry KU LeuvenCelestijnenlaan 200FLeuven 3001Belgium

The shuttle effect induced by soluble lithium polysulfides(LiPSs)is known as one of the crucial issues that limit the practical applications of lithium-sulfur(Li-S)***,a titanium dioxide nanoparticle embedded in nitrogen-doped porous carbon nanofiber(TiO_(2)@NCNF)composite is constructed via an interface-induced polymerization strategy to serve as an ideal sulfur *** the protection of the nanofiber walls,the uniformly dispersed TiO_(2) nanocrystalline can act as capturing centers to constantly immobilize LiPSs towards durable sulfur ***,the mesoporous microstructure in the fibrous framework endows the TiO_(2)@NCNF host with strong physical reservation for sulfur and LiPSs,sufficient pathways for electron/ion transfer,and excellent endurance for volume *** expected,the sulfur-loaded TiO_(2)@NCNF composite electrode presents a fabulous rate performance and long cycle lifespan(capacity fading rate of 0.062%per cycle over 500 cycles)at 2.0 ***,the assembled Li-S batteries harvest superb areal capacity and cycling stability even under high sulfur loading and lean electrolyte conditions.

关键词： interface-induced polymerization electrospun porous nanofibers lithium-sulfur(Li-S)batteries high sulfur loading lithium polysulfides(LiPSs)immobilization

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Influence of arc armature geometric parameters on current distribution at the armature/guideway interface

Influence of arc armature geometric parameters on current di...

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Pulsed Power Conference, International Conference on High-Power Particle Beams and International Symposium on electromagnetic Launch technology (EAPPC/BEAMS/EML), Euro-Asian

作者： Lixue Chen Bingxuan Zhao Penghao You State Key Laboratory of Advanced Electromagnetic Technology Key Laboratory of Pulsed Power Technology Ministry of Education School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9789038661353

ISBN: (纸本)9798350352733

In this paper, a parametric model of arc armature is established. And simulation models considering velocity skinning effect and pre-contact resistance are also established in this paper using COMSOL. Through this model, the effects of each parameter of the armature on the current distribution at the armature-rail interface are investigated, and by processing the results, the effects of different parameters on the current distribution at the armature-rail interface are compared. It is shown that the curvature of the arc surface, the amount of internal retraction and the length of the tailplane have the greatest influence on the current distribution at the armature-rail interface.

关键词： Temperature measurement Resistance Rails Temperature distribution Power measurement Pulse measurements Current distribution Particle measurements electromagnetics Surface treatment

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Characteristics comparison of SiC and Si drift step recovery diode

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Power Electronic Devices and Components 2023年 6卷

作者： Yang, Zewei Liang, Lin Yan, Xiaoxue State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

In order to evaluate the prospects of drift step recovery diode (DSRD) based on Silicon Carbide (SiC) in pulsed power field, the characteristics of DSRD based on SiC and Silicon (Si) are compared. The simulation model of the circuit based on Sentaurus TCAD is established and a trigger circuit using the saturated transformer is adopted. The simulation results show that under the same conditions, SiC DSRD has advantages in the aspect of rise time and it is less affected by pedestal effect, which is detrimental to the pulse quality and produces energy loss. The advantage of Si DSRD is that the amplitude of the output pulse voltage is high. By testing the voltage and the rise time of the output pulse, the influence of different factors including turns ratio and input voltage are discussed. For single chip of SiC DSRD with 5 kV blocking voltage, the turns ratio of transformer should be 1:5 to ensure that the parasitic inductance of transformer is low and the input voltage should be more than 500 V to guarantee that the magnetic core can be saturated. For Si DSRD stacked in series, the rise time and the width of output pulse is relatively stable and have little correlation with the changes of the input voltage, the forward pumping time and the circuit parameters. The experiment proves that SiC DSRD and Si DSRD have the advantages of the rise time and the output pulse voltage, respectively, which is consistent with the simulation results. © 2023

关键词： Silicon carbide

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Subsynchronous Oscillation Research of LCC-HVDC Receiving End System with Large-scale Renewable Power Generation 5

Subsynchronous Oscillation Research of LCC-HVDC Receiving En...

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5th IEEE International Electrical and Energy Conference, CIEEC 2022

作者： Du, Buyang Zhu, Jianhang Hu, Jiabing Guo, Zeren Shao, Dejun Xu, Youping Shi, Mengxuan Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan China Central China Branch of State Grid Corporation of China Wuhan China

ISBN: (数字)9781665411042

ISBN: (纸本)9781665411042

The line-commutated-converter (LCC) based high voltage direct current (HVDC), and renewable power generation have developed rapidly in central China. However, the risk of subsynchronous oscillation (SSO) for this typical LCC-HVDC receiving end system with large-scale renewable power generations (LCCre-RPGs) is unclear. In this paper, a small-signal model of LCCre-RPGs is constructed. The renewable power generations are simulated by a permanent magnet synchronous generator (PMSG) and a doubly-fed induction generator (DFIG). Then, the interaction between LCC-HVDC and renewable power generations is analyzed through the eigenvalue analysis and participation factor analysis. Moreover, the interaction may lead to the risk of SSO. Finally, the influence of controller parameters on the SSO modes is investigated in detail, which provides theoretical support for optimizing relevant parameters. The time-domain simulation of the original nonlinear model verifies the above analysis results. © 2022 IEEE.

关键词： Factor analysis

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Launch Efficiency of Capacitive Energy-Storage electromagnetic Railgun System

Launch Efficiency of Capacitive Energy-Storage Electromagnet...

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Pulsed Power Conference, International Conference on High-Power Particle Beams and International Symposium on electromagnetic Launch technology (EAPPC/BEAMS/EML), Euro-Asian

作者： Tingyun Xiao Lixue Chen Xuan Xu Shengqin Xu Wenhao Zhang Bingxuan Zhao State Key Laboratory of Advanced Electromagnetic Technology Key Laboratory of Pulsed Power Technology Ministry of Education School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9789038661353

ISBN: (纸本)9798350352733

electromagnetic railgun have high initial velocity, long range and other advantages. Improving the launch efficiency is one of the most important needs for the application of electromagnetic rail launch technology. Based on the subsystem models of pulse power supply, rail and armature of railgun, the equivalent circuit mathematical model of the electromagnetic rail gun system under lumped parameters is established. The effects of capacitance, voltage, inductance, resistance and acceleration distance on the system efficiency were simulated and analyzed. The results of the study are of great significance in guiding the design of the electromagnetic launch system.

关键词： Rails Resistance Performance evaluation Pulsed power supplies Power supplies electromagnetic scattering Railguns Mathematical models electromagnetics Integrated circuit modeling

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Effect of surface morphology on armature melt wear

Effect of surface morphology on armature melt wear

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Pulsed Power Conference, International Conference on High-Power Particle Beams and International Symposium on electromagnetic Launch technology (EAPPC/BEAMS/EML), Euro-Asian

作者： Bingxuan Zhao Lixue Chen Shengqin Xu Xuan Xu Wenhao Zhang Tingyun Xiao State Key Laboratory of Advanced Electromagnetic Technology Key Laboratory of Pulsed Power Technology Ministry of Education School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9789038661353

ISBN: (纸本)9798350352733

Armature melting during electromagnetic launch affects the electrical contact characteristics between armature and rail, which in turn affects the launching process and the service life of the launcher. A coupled multi-physics field model considering rough surfaces is constructed. Based on this, the influence law on armature erosion characteristics is analyzed. the results show that the higher the armature surface characteristic scale factor the lower the overall armature temperature, the later the melting onset time, but the more uneven armature surface melting; the higher the surface fractal dimension the less armature melting. The results provide a reference for the optimization of armature surface processing.

关键词： Rails Particle beams Temperature Surface morphology Armature Surface roughness Rough surfaces electromagnetics Surface treatment Optimization

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A Method to Simplify the Markov Model of Protective Systems 6

A Method to Simplify the Markov Model of Protective Systems

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6th IEEE Conference on Energy Internet and Energy System Integration, EI2 2022

作者： Wang, Xingzhu Chen, Yongxin Wen, Minghao Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China Grid Center State Grid Hubei Electric Power Research Institute Wuhan China

ISBN: (纸本)9798350347159

The state space approach is a common method for conducting reliability assessment of protective systems. However, as more factors affecting the reliability of protective relay are considered, the system Markov model is becoming more and more complex and its solving efficiency is decreasing. To avoid this, a method to simplify the Markov model of protective system is proposed in this paper. Based on the continuous-time Markov process (CTMP), the theory underlying the state space approach, the method illustrates that the duration of the protective system in the switching states can be neglected. In other words, the protection switching state can be ignored when developing a Markov model of protective system. This method is applied to two existing models, one for a protection/component system and the other for redundant protective systems. The study results show that the method significantly reduces the complexity of the Markov model and improves the solving efficiency without reducing the capability of Markov model to describe the reliability of protective systems. © 2022 IEEE.

关键词： Reliability

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A Numerical Model of Magneto-Electro-Thermo-Mechanical Characteristics at the Armature-Rail Contact Interface

A Numerical Model of Magneto-Electro-Thermo-Mechanical Chara...

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Pulsed Power Conference, International Conference on High-Power Particle Beams and International Symposium on electromagnetic Launch technology (EAPPC/BEAMS/EML), Euro-Asian

作者： Xuan Xu Lixue Chen Shengqin Xu Wenhao Zhang Bingxuan Zhao Tingyun Xiao State Key Laboratory of Advanced Electromagnetic Technology Key Laboratory of Pulsed Power Technology Ministry of Education School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (数字)9789038661353

ISBN: (纸本)9798350352733

The movement of the armature during the launch process of the electromagnetic railgun is a type of high-speed sliding electrical contact. The characteristics inside the barrel cannot be measured directly. In this paper, a better prediction numerical model is developed. The model involves mechanical calculation part into previous electromagnetic thermal coupling relationships. Based on the contact pressure between the armature and rail obtained from the mechanical calculation part, as well as the rough surface characteristics, the influence of contact resistance on electromagnetic and temperature distribution is also considered. Finite difference formats of bilinear interpolation characteristic method and exponential high-order compact alternating direction implicit method are used to solve the electromagnetic field distribution and temperature field distribution respectively. Finite element incremental superposition method based on the Updated Lagrangian description is used to solve the stress distribution. The contact interface characteristics of rectangular armature and C-shaped armature without considering contact resistance and considering contact resistance are calculated. Results show that the electromagnetic distribution characteristics of C-shaped armatures are significantly better than those of rectangular armatures.

关键词： Couplings Temperature distribution Surface resistance Armature Contact resistance Railguns Surface roughness Numerical models electromagnetics Stress

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