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Manipulating Interfacial Stability via Preferential Absorption for Highly Stable and Safe 4.6 V LiCoO_(2) Cathode

Nano-Micro Letters 2025年第8期17卷 95-110页

作者： Long Chen Xin He Yiqing Chen Youmin Hou Yujie Zhang Kangli Wang Xinping Ai Yuliang Cao Zhongxue Chen Key Laboratory of Hydraulic Machinery Transients Ministry of EducationSchool of Power and Mechanical EngineeringWuhan UniversityWuhan 430072People’s Republic of China State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074People’s Republic of China Hubei Key Laboratory of Electrochemical Power Sources College of Chemistry and Molecular SciencesWuhan UniversityWuhan 430072People’s Republic of China

Elevating the upper cutoff voltage to 4.6 V could effec-tively increase the reversible capacity ofLiCoO_(2)(LCO)cathode,whereas the irreversible structural transition,unstable electrode/electrolyte interface and potentially induced safety hazards severely hinder its industrial *** a robust cathode/electrolyte interface film by electrolyte engineer-ing is one of the efficient approaches to boost the performance of high-voltage LCO(HV-LCO);however,the elusive interfacial chemistry poses substantial challenges to the rational design of highly compatible ***,we propose a novel electrolyte design strategy and screen proper solvents based on two factors:highest occupied molecular orbital energy level and LCO absorption ***(2,2,2-trifluoroethyl)phosphate is determined as the optimal solvent,whose low defluorination energy barrier significantly promotes the construction of LiF-rich cathode/electrolyte interface layer on the surface of LCO,thereby eventually suppresses the phase transition and enhancesLi+diffusion *** rationally designed electrolyte endows graphite||HV-LCO pouch cells with long cycle life(85.3%capacity retention after 700 cycles),wide-temperature adaptability(-60–80℃)and high safety(pass nail penetration).This work provides new insights into the electrolyte screening and rational design to constructing stable interface for high-energy lithium-ion batteries.

关键词： Electrolyte design LiF-rich interface Wide-temperature High-safe 4.6 V LCO

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Finite element analysis of pile expansion by shock wave of metal wire explosion in liquids 6

Finite element analysis of pile expansion by shock wave of m...

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6th IEEE International Electrical and Energy Conference, CIEEC 2023

作者： Liu, Yi Huang, Shijie Zhao, Yong Xu, Youlai Wang, Tianyu Lin, Fuchang Li, Hua Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Key Laboratory of Pulsed Power Technology Wuhan China

ISBN: (纸本)9798350346671

Construction of specially shaped pile foundations by compacting the soil around the borehole with shock waves, which can effectively increase the load-bearing capacity of the pile material. The metal wire explosion in liquid has the advantages of high energy efficiency, good repeatability and controllability. The strong shock wave generated by the explosion can compress the soil to enlarge the size of pile foundations and construct shaped pile foundations, which has industrial prospects. In order to analyze the mechanism of pile expansion by metal wire explosion in liquid, a test platform was established, and parameters such as discharge voltage, current and energy were obtained. Based on the dynamic analysis software Ls-dyna, a two-dimensional simulation model of the shock wave generated by explosion in liquid acting on the soil was established, and the material parameters and model dimensions were reasonably determined. The propagation and attenuation processes of shock waves in cement slurry and soil were numerically simulated. The cumulative effect of pile foundation expansion under the action of multiple shock waves was analyzed, and compared with the test results. © 2023 IEEE.

关键词： Piles

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Disruption prediction based on fusion feature extractor on J-TEXT

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Chinese Physics B 2023年第7期32卷 12-23页

作者：郑玮薛凤鸣陈忠勇沈呈硕艾鑫坤钟昱王能超张明丁永华陈志鹏杨州军潘垣 International Joint Research Laboratory of Magnetic Confinement Fusion and Plasma Physics State Key Laboratory of Advanced Electromagnetic Engineering and TechnologySchool of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China Institute of Artificial Intelligence Huazhong University of Science and TechnologyWuhan 430074China

Predicting disruptions across different tokamaks is necessary for next generation *** large-scale tokamaks can hardly tolerate disruptions at high performance discharge,which makes it difficult for current data-driven methods to obtain an acceptable result.A machine learning method capable of transferring a disruption prediction model trained on one tokamak to another is required to solve the *** key is a feature extractor which is able to extract common disruption precursor traces in tokamak diagnostic data,and can be easily transferred to other *** on the concerns above,this paper presents a deep feature extractor,namely,the fusion feature extractor(FFE),which is designed specifically for extracting disruption precursor features from common diagnostics on ***,an FFE-based disruption predictor on J-TEXT is *** feature extractor is aimed to extracting disruption-related precursors and is designed according to the precursors of disruption and their representations in common tokamak *** inductive bias on tokamak diagnostics data is *** paper presents the evolution of the neural network feature extractor and its comparison against general deep neural networks,as well as a physics-based feature extraction with a traditional machine learning *** demonstrate that the FFE may reach a similar effect with physics-guided manual feature extraction,and obtain a better result compared with other deep learning methods.

关键词： feature extractor disruption prediction deep learning tokamak diagnostics

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Revealing the size effect of Fe S2on solid-state battery performances at different operating temperatures

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Chinese Chemical Letters 2024年第6期35卷 189-194页

作者： Chaochao Wei Ru Wang Zhongkai Wu Qiyue Luo Ziling Jiang Liang Ming Jie Yang Liping Wang Chuang Yu School of Chemistry and Chemical Engineering Huazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China School of Materials and Energy University of Electronic Science and Technology of ChinaChengdu 611731China

FeS_(2) shows significant potential as cathode material for all-solid-state lithium batteries(ASSLBs)due to its high theoretical specific capacity,low cost,and environmental ***,the poor ion/electron conductivity and large volume variation effect of FeS_(2) inhibit its practical ***,the influence of particle size of FeS_(2) on the corresponding sulfide-based solid-state batteries is carefully investigated by tuning FeS_(2) ***,low operating temperature is chosen to mitigate the large volume changes during cycling in the battery.S-FeS_(2) with smaller particle sizes delivers superior electrochemical performances than that of the larger L-FeS_(2) in Li_(5.5)PS_(4.5)Cl_(1.5)-based ASSLBs under different operating temperatures.S-FeS_(2) shows stable discharge capacities during 50 cycles with a current density of 0.1 m A/cm^(2)under -20℃.When the current density rises to 1.0 m A/cm^(2),it delivers an initial discharge capacity of 146.9 m Ah/g and maintains 63% of the capacity after 100 *** work contributes to constructing ASSLBs enables excellent electrochemical performances under extreme operating temperatures.

关键词： FeS_(2) Size effect Li_(5.5)PS_(4.5)Cl_(1.5) electrolytes Operating temperatures Electrochemical performances

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Research on inductance gradient of electromagnetic railgun based on eddy current field analysis 10

Research on inductance gradient of electromagnetic railgun b...

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10th Euro-Asian Pulsed Power Conference, 25th International Conference on High-Power Particle Beams and 20th International Symposium on electromagnetic Launch technology, EAPPC-BEAMS-EML 2024

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

ISBN: (纸本)9789038661353

Inductance gradient has a significant effect on muzzle kinetic energy and launch efficiency in electromagnetic railgun. Inductance gradient is determined by the current distribution in the armature and rail, transient skin effect, velocity skin effect, and proximity effect are the main physical mechanisms affecting the current distribution of electromagnetic railgun. Additionally, the structure and size of the rail also have an impact on current distribution. In order to analyze inductance gradient, the control equation of the electromagnetic railgun is analyzed, and the 3D motion model of the electromagnetic railgun is established. The distribution of the 3D current and magnetic field under the influence of the velocity skin effect is calculated, and then the time-varying curves of the inductance gradient during the whole launch process are drawn, curves show that the inductance gradient trend when velocity skin effect is considered is opposite to that not considered. At the same time, the inductance gradient under different rail structures is compared by simulation calculation, the results show that the inductance gradient of the rectangular rail is larger than that of the T-shaped rail and the arc-shaped rail. Finally, the effect of the dimensions of the rectangular rail on the inductance gradient is investigated, and the results show that the inductance gradient of the rectangular rail decreases gradually with the increase of the rail width, and increases and then decreases with the increase of the rail height. © 2024 Eindhoven University of technology.

关键词： Kinetic energy

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Multi-objective Optimization Method of arc Armature Based on Anti-Transition 19th

Multi-objective Optimization Method of arc Armature Based on...

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19th Annual Conference of China Electrotechnical Society, ACCES 2024

作者： Gu, Anbang Xia, Shengguo Key Laboratory of Pulsed Power Technology Ministry of Education Huazhong University of Science and Technology Wuhan China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9789819608966

Three optimization objectives are proposed to suppress transition during the armature launching process: the deviation rate of the current density distribution on the armature rail’s contact surface under steady-state current, the deviation rate of the current density distribution on the throat’s surface under steady-state current, and the deviation degree of the overfill contact pressure’s center of action. The NSGA-2 multi-objective optimization algorithm is used to optimize the armature structure. Firstly, the random response surface of the optimization objectives is established in a large range of armature geometrical parameters, and then the range of values of armature geometrical parameters is obtained according to the limitations of the armature structure in the actual problem, and then the optimization of the armature structure is carried out and the optimal compromise solution is screened out in this range. The simulation results show that the optimized armature, compared with the benchmark armature, has a more centered distribution of the overfill contact pressure on the contact surface, smaller current peaks on the contact surface of the armature rails during the launching process, and lower maximum temperature at the throat, which indicates that the optimized armature is more capable of suppressing the armature start-up phase transition, the magnetic saw of the throat transition, and the current falling-edge phase transition. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Multiobjective optimization

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Characterization of a Raman-based distributed fiber optical temperature sensor in liquid nitrogen

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Superconductivity 2022年第4期4卷 22-28页

作者： Yi Yue Guilun Chen Jiajie Long Li Ren Kao Zhou Xianhao Li Ying Xu Yuejin Tang State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhanChina

Distributed Temperature Sensor(DTS)based on Raman scattering have a promising application in temperature monitoring and quench detection of high‐temperature superconducting(HTS)fiber optic *** this paper,a series of mechanical property tests were carried out on fiber optical cables with different encapsulation materials to select the best material for the engineering *** was followed by loss testing of fiber optic cables with different outer diameters under liquid nitrogen(LN_(2))and the optimal outer diameter to meet measurement accuracy and engineering practicability was ***,the temperature measurement of fiber optic cables laid on HTS fiber optic cables were calibrated using thermocouple as a *** results of this research results provide a suitable fiber optic cable for engineering *** the same time,it provides a reference for the selection of optical cable structure parameters in HTS optical cable projects.

关键词： DTS HTS cable Mechanical property Optical loss

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Grid Forming Converters in Renewable Energy Sources Dominated Power Grid:Control Strategy,Stability,Application,and Challenges

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Journal of Modern Power Systems and Clean Energy 2021年第6期9卷 1239-1256页

作者： Haobo Zhang Wang Xiang Weixing Lin Jinyu Wen State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology TBEA Sunoasis Company Ltd. the State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology

The renewable energy sources(RESs)dominated power grid is an envisaged infrastructure of the future power system,where the commonly used grid following(GFL)control for grid-tied converters suffers from lacking grid support capability,low stability,***,emerging grid forming(GFM)control methods have been proposed to improve the dynamic performance and stability of grid-tied *** paper reviews existing GFM control methods for the grid-tied converters and compares them in terms of control structure,grid support capability,fault current limiting,and *** the impact of fault current limiting strategies,a comprehensive transient stability analysis is *** addition,this paper explores the typical applications of GFM converters,such as AC microgrid and offshore wind farm high-voltage direct current(OWF-HVDC)integration ***,the challenges to the GFM converters in future applications are discussed.

关键词： Grid following(GFL)control grid forming(GFM)control high-voltage direct current(HVDC) microgrid renewable energy small-signal stability transient stability

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Modular Modeling Method for Transfer Function of VSC Grid-Connected System 3

Modular Modeling Method for Transfer Function of VSC Grid-Co...

引用

3rd International Conference on Intelligent Power and Systems, ICIPS 2023

作者： Li, Yutong Sun, Haishun The State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Hubei Wuhan China

ISBN: (纸本)9798350328691

This paper provides a detailed introduction to a modular modeling approach for the transfer function of the VSC grid-connected system. The obtained results can accurately reflect the small-disturbance stability level of VSC grid-connected systems. These results are based on the VSC outer-loop reference signal and the corresponding feedback signal, constituting a two-input two-output system. The modeling process involves three steps. Initially, only the dynamic processes of the VSC inner-loop control and PLL control modules are considered. Subsequently, the relevant modules of the VSC outer-loop control are included. Finally, it is condensed into a concise form. By utilizing the basic property of linearity in systems that adhere to the superposition principle, it can be converted into an equivalent single-input single-output system. This enables the application of the Nyquist stability criterion for stability analysis. All results presented in this paper have been validated through PSCAD/EMTDC simulation. ©2023 IEEE.

关键词： Transfer functions

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Operation Strategy of Cryogenic System for High-Temperature Superconducting Cable Based on The Recommended Interval

Operation Strategy of Cryogenic System for High-Temperature ...

引用

2023 IEEE International Conference on Applied Superconductivity and electromagnetic Devices, ASEMD 2023

作者： Chen, Guilun Ren, Li Xu, Ying Long, Feiyang Wu, Jiajie Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China

ISBN: (纸本)9798350301571

High temperature superconducting (HTS) cables will suffer from performance degradation at high operating temperatures, and in severe cases even quench. The cryogenic system is able to effectively regulate the temperature distribution of the HTS cable by setting the operating parameters in a reasonable range to ensure its performance. It is therefore necessary to investigate operation strategy for cryogenic system that take the temperature distribution along the cable into account. In this paper, the specific requirements for the safe operation of HTS cable system with regard to the operating parameters of cryogenic system are analyzed. An operation strategy for cryogenic system is proposed to achieve thermally stable operation of HTS cable. © 2023 IEEE.

关键词： cryogenic system High temperature superconducting cable operation strategy temperature distribution

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