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Carbon decorated Li_(3)V_(2)(PO_(4))_(3) for high-rate lithium-ion batteries:Electrochemical performance and charge compensation mechanism

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Journal of Energy Chemistry 2021年第2期30卷 124-131,I0005页

作者： Manling Ding Chen Cheng Qiulong Wei Yue Hu Yingying Yan Kehua Dai Jing Mao Jinghua Guo Liang Zhang Liqiang Maig Institute of Functional Nano&Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&1 DevicesSoochow UniversitySuzhou 215123JiangsuChina Department of Materials Science and Engineering Fujian Key Laboratory of Materials GenomeCollege of MaterialsXiamen UniversityXiamen 361005FujianChina College of Chemistry Tianjin Normal UniversityTianjin 300387China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001HenanChina Advanced Light Source Lawrence Berkeley National LaboratoryBerkeleyCA 94720United States Department of Chemistry and Biochemistry University of CaliforniaSanta CruzCA 95064United States State Key Laboratory of Advanced Technology for Materials Synthesis and Processing International School of Materials Science and EngineeringWuhan University of Technology.Wuhan 430070HubeiChina

Fast charging and high-power delivering batteries are highly demanded in mobile electronics,electric vehicles and grid energy storage,but there are full of *** star-material Li_(3)V_(2)(PO_(4))_(3) is demonstrated as a promising high-rate cathode material meeting the above ***,we report the carbon decorated Li_(3)V_(2)(PO_(4))_(3) (LVP/C) cathode prepared via a facile method,which displays a remarkable high-rate capability and long-term cycling ***,the prepared LVP/C delivers a high discharge capacity of 122 mAh g^(-1)(-93% of the theoretical capacity) at a high rate up to 20 C and a superior capacity retention of 87.1% after 1000 ***,by applying a combination of X-ray absorption spectroscopy and full-range mapping of resonant inelastic X-ray scattering,we clearly elucidate the structural and chemical evolutions of LVP upon various potentials and cycle *** show unambiguous spectroscopic evidences that the evolution of the hybridization strength between V and O in LVP/C as a consequence of lithiation/delithiation is highly reversible both in the bulk and on the surface during the discharge-charge processes even over extended cycles,which should be responsible for the remarkable electrochemical performance of LVP/*** present study provides not only an effective synthesis strategy but also deeper insights into the surface and bulk electrochemical reaction mechanism of LVP,which should be beneficial for the further design of high-performance LVP electrode materials.

关键词： Lithium-ion batteries Li_(3)V_(2)(PO_(4))_(3) Charge compensation mechanism X-ray absorption spectroscopy Resonant inelastic X-ray scattering

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Optimized Design of a Thermionic Electron Gun Applied to a High-power FEL Injector

Optimized Design of a Thermionic Electron Gun Applied to a H...

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Electrical engineering (CIYCEE), IEEE China International Youth Conference on

作者： Xiaoyu Peng Tongning Hu Yufei Peng Jidong Long Jianjun Deng Guangyao Feng School of National Synchrotron Radiation Laboratory University of Science and Technology of China Hefei China State Key Laboratory of Advanced Electromagnetic Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China GUSU Laboratory Suzhou China Suzhou Laboratory Suzhou China Academician of the Chinese Academy of Engineering an Expert of Intense Pulsed Accelerator a Doctoral Supervisor of the Chinese Academy of Engineering Physics and the Chief Engineer of the Institute of Fluid Physics

This paper mainly designs a high-power free electron laser injector system, which has a low-emittance electron gun using a gridded thermionic cathode. The distance between the anode and the radio frequency cavity exit is designed to be as short as possible in the manufacturing level. In the process of optimizing the electron gun, simulation by cell signaling technology is mainly conducted on the effects of the shape, hole spacing, wire size, and thickness of the grid on the electron beam’s emittance, particle passing rate and so on. Therefore, the optimal parameters of the electron gun, especially the structure of the grid and the grid bias voltage, are obtained, generating a uniformly distributed current with current intensity of 0.5 A, the pulse length of 1 ns, and a normalized root mean square emittance of 1.6 mm∙mrad. In order to reduce the increase in emittance caused by the space charge effect in the low energy region, a -50 kV electron gun is connected to a 476 MHz sub-harmonic buncher through a drift section with the solenoid. The optimization in Parmela resulted in excellent longitudinal phase space, beam spot size, and emittance of the electron beam at the injector exit.

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Supply Restoration Method of Flexible Active Distribution Network Using Power Router

SSRN

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SSRN 2023年

作者： Mao, Jilong Yin, Xianggen Yin, Xin Dou, Zhenlan Sun, Pei Lai, Jinmu School of Electrical and Electronic Engineering State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China School of Automation Wuhan University Of Technology Wuhan China State Grid Shanghai Municipal Electric Power Company Shanghai China State Grid Shanghai Electric Power Research Institute Shanghai China School of Electrical and Information Engineering Zhengzhou University Zhengzhou China

Power Router(PR) is an energy exchange device in power systems that is based on fully-controlled power electronic device. It can be flexibly controlled to achieve fault isolation and provide voltage support to the fault area, thus enhancing the power restoration capability of the system. This paper proposes a fault restoration strategy method based on PR. The system power flow model is firstly improved to accommodate systems incorporating PR. Then we present a corresponding fault restoration strategy after system faults and provide an active distribution network power restoration model. This model is essentially a large-scale nonlinear programming model, which is transformed and solved by using second-order cone programming methods. Next, case studies are carried out on a modified IEEE 33 bus system with the PR. The factors affecting the power restoration capability of the PR are analyzed. The results demonstrate that the PR is capable of recovering from system faults and achieving fault restoration. Moreover, compared to methods such as network reconstruction, the PR exhibits a higher restoration ratio. © 2023, The Authors. All rights reserved.

关键词： Second-order cone programming

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Calculation and Analysis of Transient and Sub-Transient Processes in Homopolar Inductor Machine

Calculation and Analysis of Transient and Sub-Transient Proc...

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International Conference on Electrical Machines and Systems (ICEMS)

作者： Jiakang Yao Yong Zhao Yanqing Zhao Xin Zhang Tengda Guo Kexun Yu Zixi Wang State Key Laboratory of Tribology Tsinghua University Beijing PR China Shaanxi Aero Electric Co.Ltd Xi’an PR China College of Mechanical Engineering Shenyang University of Technology Shanyang PR China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan PR China

ISBN: (数字)9781665493024

ISBN: (纸本)9781665493031

Homopolar inductor machine (HIM) belongs to the electrical excitation synchronous machine (EESM), but compared with the conventional wound-field synchronous machine (WFSM), it has static field winding and static armature winding, whose rotor is solid structure without any winding or permanent magnetic on it. In this paper, it is found that an obvious difference of the transient and sub-transient (T&ST) characteristics between HIM and WFSM due to the special three-dimensional homopolar magnetic structure of HIM. Firstly, in this paper, before analyzing the T&ST processes, it is necessary to sort, derive and develop the steady-state parameter formulae of HIM. Secondly, for the transient process, the variables are calculated, the special transient characteristics are explained and the reasons are revealed. Thirdly, the subtransient processes caused by the eddy currents in HIM are discussed qualitatively, whose parameters calculation method is the same as that of the transient process and not be repeated.

关键词： Magnetic flux Inductance Magnetostatics Windings Rotors Steady-state Transient analysis

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铌酸锂调控固态电解质电场结构促进锂离子高效传输

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Science China Materials 2024年第6期67卷 1947-1955页

作者：刘晓潼温博华钟贵明程醒简翠英郭勇黄妍斐马家宾史沛然陈立坤张丹丰吴士超柳明吕伟贺艳兵康飞宇 Shenzhen All-Solid-State Lithium Battery Electrolyte Engineering Research Center Institute of Materials Research(IMR)Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055China School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China Laboratory of Advanced Spectro-electrochemistry and Li-ion Batteries Dalian Institute of Chemical Physics Chinese Academy of SciencesDalian 116023China Department of Mechanical Engineering York UniversityTorontoON M3J 1P3Canada Nanoyang Group State Key Laboratory of Chemical EngineeringSchool of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China College of Materials Science and Engineering Shenzhen UniversityShenzhen 518055China

聚合物基固态电解质得益于其易加工性,最有希望应用于下一代固态锂金属电池.目前,聚合物基态电解质的离子电导率提升策略多为加入导锂陶瓷以构建离子传输通道,其提升程度有限.电场在锂离子输运过程中存在重要影响,目前研究中有关电场对... 详细信息

聚合物基固态电解质得益于其易加工性,最有希望应用于下一代固态锂金属电池.目前,聚合物基态电解质的离子电导率提升策略多为加入导锂陶瓷以构建离子传输通道,其提升程度有限.电场在锂离子输运过程中存在重要影响,目前研究中有关电场对锂离子传输的影响机制尚不明确.本文将兼具高离子电导率和高介电常数的铌酸锂嵌入聚偏氟乙烯基体中,设计了一种新型复合固态电解质.铌酸锂颗粒有效调节电解质内部电场结构,增强了离子输运方向电场强度,实现了离子电导率的大幅提升(7.39×10^(-4)S cm^(-1),25℃).该电解质匹配高镍正极和锂金属负极的固态电池可稳定循环1000次以上,容量保持率为72%.该研究为设计下一代固态锂电池用高离子电导复合固态电解质提供了新的策略.

关键词： lithium niobate solid-state electrolytes dielectric ceramics electric field regulation

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Highly Stable and Encapsulation-Microstructural Cathode Enabled by Na-Halides for Superb All-Solid-state Na Batteries

SSRN

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SSRN 2023年

作者： Li, Lin Yao, Jingming Xu, Ruonan Yan, Xinlin Yu, Chuang Zhang, Long Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials College of Physics and Energy Fujian Normal University Fuzhou350117 China Clean Nano Energy Center State Key Laboratory of Metastable Materials Science and Technology Yanshan University Hebei Qinhuangdao066004 China Institute of Solid State Physics Vienna University of Technology Wiedner Hauptstr. 8-10 Vienna1040 Austria State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430000 China

The emerging halide solid electrolytes (SEs) possess superior (electro)chemical oxidation stabilities compared to sulfide SEs, but the understanding on their good compatibility toward oxide active materials needs to be further studied. Here, we develop a type of Zr-doped Na3YbCl6 chloride SEs. The optimized composition gains a high ionic conductivity and broad electrochemical oxidation window. The in situ EIS-DRT and ex situ XPS analyses verify that the chloride as ionic additives in the cathode is highly compatible with NaCrO2. Importantly, it is revealed that the volume change in the cathode can act a position effect on the microstructure evolution. It promotes to form a special core-shell-like structure with homogeneous chloride encapsulating NaCrO2 grains. Such a soft intimate contact promotes a uniform ion transport and mitigate electrochemo-mechanical stresses. The prerequisites generating this specific microstructure are proposed. The main capacity loss of the assembled ASSNBs only occurs at the initial 50 cycles, induced by the irreversible O3→O'3 phase transition in NaCrO2. The chloride additives with a soft feature and high oxidation-stability allow a high-quality interface in the oxide cathode and an excellent cycling stability of the ASSNBs. © 2023, The Authors. All rights reserved.

关键词： Solid electrolytes

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electromagnetic Design and Optimization of 13 T Split Superconducting Magnet for Neutron Scattering

Electromagnetic Design and Optimization of 13 T Split Superc...

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2020 IEEE International Conference on Applied Superconductivity and electromagnetic Devices, ASEMD 2020

作者： Zhu, Sihua Tan, Yunfei University of Science and Technology of China Hefei China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781728152158

Neutron scattering is one of the most exceptional experimental techniques used to investigate the structure and dynamics of condensed matter at the atomic scale. Neutron scattering magnet system provide high magnetic field sample environment as an ideal tool platform for science research. A hybrid optimization approach including four steps for the neutron scattering superconducting magnet design is introduced in the paper. The method adopted fourth-order solenoid ideal model for magnetic field calculation, and adopted linear programming to obtain initial ideal parameters of superconducting coils. After checking viability, a practical design for neutron scattering superconducting magnet has been obtained. The magnet employs seven split coils winded on five pairs bobbins, the inner diameter of coil is 70.4 mm and outer diameter is 397.8 mm, the total length of coils is 380 mm. The central field of superconducting magnet is 13 T when the magnet is charged to the maximum operating current of 114.13 A. The magnetic field and stress are calculated and simulated by finite element software, the inhomogeneity of sample volume is less than 0.231% over a 10 mm×10 mm volume. All of the magnet specification satisfied the design requirements. © 2020 IEEE.

关键词： Linear programming

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Large-Scale Fabricating Carbon Coating Chevrel Phase in Molten Salts: Implications for High-Performance Magnesium-Ion Battery Cathode

SSRN

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SSRN 2022年

作者： Zhao, Wenjie Li, Haomiao Zhang, Yujie Wang, Kangli Jiang, Kai State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology No.1037 Luoyu Road Wuhan430074 China State Key Laboratory of Materials Processing and Die & Mould Technology College of Materials Science and Engineering Huazhong University of Science and Technology No.1037 Luoyu Road Wuhan430074 China

Molten salt synthesis is a facile, extensible and effective way to obtain specific electrode materials with in situ carbon coating. Herein, a carbon coating Mo 6 S 8 compounds are synthesized based on molten KCl medium, and the excellent electrochemical Mg-storage performance are demonstrated in rechargeable Mg ion batteries. Benefiting from the in situ carbon coating, the as-synthesized Mo 6 S 8 @C delivers a high reversible capacity of 90 mAh g –1 and a superior rate performance. Further mechanism investigation via kinetics testing, ex situ XRD and XPS demonstrate that the carbon coating layer on the surface of Mo 6 S 8 could accelerate the electron/ion transport and improve the rate performance and stability of the electrodes. This work provides a possible way to large-scale fabricate the carbon coating Mo 6 S 8 and lays a foundation for the practical applications of Mg ion batteries. © 2022, The Authors. All rights reserved.

关键词： Fabrication

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Finite-Set Model Predictive Current-Control in Field Weakening Region for Linear Induction Machines

Finite-Set Model Predictive Current-Control in Field Weakeni...

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Workshop on Predictive Control of Electrical Drives and Power Electronics (PRECEDE)

作者： Mahmoud F. Elmorshedy Wei Xu Faculty of Engineering Tanta University Egypt State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology China

ISBN: (纸本)9781665425582

The main purpose for the execution of this strategy is to control the linear induction machines (LIMs) over the rated linear speed. This is developed by one field weakening by finite-set model predictive current control (FW-FSMPCC). The reference values of Id and Iq are continuously adapted as a function to control the speed. This enhances the drive capability where the machine can work under both rated speed and over rated speed. The maximum current and voltage are taken into consideration to keep the machine working with safe operation. Only the primary currents are used in the optimized cost function and therefore no weighting factor is needed like the thrust control. The primary current errors would occur in αβ-coordinates, which is estimated by considering the absolute value of subtraction of primary reference current from the predicted primary current. The end-effect phenomenon is also taken under consideration for the design process of the suggested control method and for dynamic model of the LIM. All theoretical analysis has been validated by comprehensive simulation results based on parameters of one arc induction machine with estimated power 3 kW and large radius.

关键词： Current control Adaptation models Simulation Conferences Predictive models Cost function Power electronics

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The $\alpha\beta$ Impedance Modeling with Small Disturbances of Any Form for Three-phase Power-Electronics-Based Power Systems

The $\alpha\beta$ Impedance Modeling with Small Disturbances...

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Electrical engineering and Control Technologies (CEECT), Conference on

作者： Ziqian Yang Yifan Huang Meng Zhan State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

Many methods have been proposed for small-signal stability analysis of power-electronic-based power systems. As one common method, the sequence impedance model stands on that the disturbances are in the form of harmonics, which seems not consistent with the basic small-signal stability theory. In this paper, firstly small disturbances of any forms are applied to the three-phase voltage. By a rigorous Laplace transform, the $\alpha\beta$ impedance of the power electronic device is obtained, both in the form of transfer function matrix and complex transfer function. Then, the equivalence between the proposed model, the sequence impedance model, and the complex transfer function model are obtained. Finally, the open-loop response of a voltage source converter (VSC) and the stability of its grid connected system are verified by simulation. Based on the detailed analysis in the paper, it has been proved that the sequence impedance model is suitable for small-signal stability analysis of power-electronic-based power systems under not only harmonic disturbances but also any forms of disturbances, standing on a more rigorous mathematical basis.

关键词： Analytical models Transfer functions Voltage Power system stability Power system harmonics Harmonic analysis Mathematical models

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