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Mo_(2)C催化的低压纳米Li_(2)C_(2)O_(4)预锂化用于高能量锂离子电池

Science China Materials 2023年第3期66卷 903-912页

作者：钟伟张策李思吾张薇曾子琪程时杰谢佳 State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430000China State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China

初始循环中不可逆的锂损失显著降低了锂离子电池的能量密度预锂化是补偿锂损失的有效方法之一,但目前的方法存在预锂化试剂不稳定或容量低的问题.草酸锂(Li_(2)C_(2)O_(4))作为一种高理论容量(相当于锂金属)、低成本和空气稳定的锂补偿... 详细信息

初始循环中不可逆的锂损失显著降低了锂离子电池的能量密度预锂化是补偿锂损失的有效方法之一,但目前的方法存在预锂化试剂不稳定或容量低的问题.草酸锂(Li_(2)C_(2)O_(4))作为一种高理论容量(相当于锂金属)、低成本和空气稳定的锂补偿材料已显示出巨大的潜力.然而低电化学活性和高分解电位严重阻碍了其实际应用.本文中,我们报道了一种低压预锂化技术.通过配合使用Mo_(2)C催化剂和纳米Li_(2)C_(2)O_(4)Mo_(2)C催化剂改变了Li_(2)C_(2)O_(4)周围的电子云分布,大大降低了活化能,从而显著加速了锂从Li_(2)C_(2)O_(4)中的释放.通过冷冻干燥制备的纳米Li_(2)C_(2)O_(4)与Mo_(2)C催化剂形成良好接触并展现出快速的离子和电子传导.得益于这种协同效应,Li_(2)C_(2)O_(4)的分解电位降低了0.5 V,分解效率接近100%.纳米Li_(2)C_(2)O_(4)/Mo_(2)C复合材料补偿的LiCoO_(2)||SiO全电池展现出可以高于对照组46.9%的比容量,显示出巨大的实际应用潜力.

关键词：锂离子电池理论容量预锂化电化学活性分解电位全电池电子传导能量密度

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Method to Detect Arc Across Pantograph-Catenary Structure Atop Train Based on Frequency Features of Entry Current 1

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6th International Conference on Electrical engineering and Information Technologies for Rail Transportation, EITRT 2023

作者： Du, Yufei Jiao, Yang Zhu, Yongzheng Chen, Jun Li, Hongbin Chen, Qing Institute of Artificial Intelligence Huazhong University of Science and Technology Wuhan430074 China School of Electrical and Electronics Engineering Huazhong University of Science and Technology Wuhan430074 China State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China

ISBN: (数字)9789819993192

ISBN: (纸本)9789819993185

During a train running at speed, the pantograph-catenary structure atop the train would be influenced by many factors, resulting in disconnections. A timely detection on arcs across this structure helps to guide works on real-time operating and later maintenance, to eliminate latent factors of disconnection. A theory on the generation of arcs is researched, simulated, and verified with practical data. Two features of entry current, in frequency bands at kHz degree and at harmonic-Hz degree, are picked for the detection. Based on the discrepancy on these bands while arcing and normally running, a model of support vector machine (SVM) is constructed. Existing signals on train are processed and rearranged to be datasets for training SVM. After applying it to a practical railway, the results illustrate: the accuracy on arc detections is up to 99.96%. With guidance from results, an on-site investigation was launched, and mark of flaming was found at corresponding location of catenary, which verified the correctness. © 2024, Beijing Paike Culture Commu. Co., Ltd.

关键词： Pantographs

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A Cooperative Optimization Strategy for Access and Reconfiguration of Microgrids 3

A Cooperative Optimization Strategy for Access and Reconfigu...

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3rd IEEE China International Youth Conference on Electrical engineering, CIYCEE 2022

作者： Xu, Zhiwen Chen, Changsong Zhou, Xinheng Zhang, Jingyue Han, Dongtong Dong, Mingyang State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

ISBN: (数字)9781665477321

ISBN: (纸本)9781665477321

The random access of the microgrids (MGs) to distribution network and disordered operation will result in high network loss. Aiming at this problem, a double-loop cooperative optimization strategy for optimizing network loss is proposed. This strategy builds an optimization model based on MGs with electric vehicles (EVs) and renewable energy sources (RES). The inner-loop model reconfigures the network structure of MGs through optimization to reduce the basic network loss of the MGs. The outer-loop model optimizes the node location of the MG accessed to the distribution network in the MGs to reduce the increased network loss. The inner-loop and outer-loop synergistically reduce the total network loss of the MGs. Particle swarm optimization (PSO) is used to solve the model. Finally, four simulation cases are used to prove the rationality and feasibility of the proposed strategy. © 2022 IEEE.

关键词： Particle swarm optimization (PSO)

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Nonlinear Optimal Control for 2.5-kW LLC Converts With Pulse Loads 3

Nonlinear Optimal Control for 2.5-kW LLC Converts With Pulse...

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3rd IEEE China International Youth Conference on Electrical engineering, CIYCEE 2022

作者： Liu, Wanjun Duan, Shanxu Luo, Senwen Peng, Te Wang, Yadong School of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China

ISBN: (数字)9781665477321

ISBN: (纸本)9781665477321

In the case of pulse load, the power supply is constantly switched from no-load to full-load, which would cause the output voltage to fluctuate. In order to reduce the voltage fluctuation and improve the dynamic performance, a nonlinear control method is proposed in this paper. When the voltage change is detected, the control strategy is changed to switch between burst control and PFM control. The proposed control strategy is verified on a 2.5kW LLC prototype. The experimental results demonstrated that the output voltage drops, overshoots and settling time are reduced over the SOTC control method. It shows that the control strategy has a good effect in the pulse load application. © 2022 IEEE.

关键词： Electrical engineering Fluctuations Voltage fluctuations Power supplies Optimal control Resonant frequency Prototypes

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Review of SiC MOSFET Failure Analysis Under Extreme Conditions: High Temperature, High Frequency and Irradiation

Review of SiC MOSFET Failure Analysis Under Extreme Conditio...

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International Joint Conference on Energy, Electrical and Power engineering, CoEEPE 2021

作者： Zhang, Ziyang Liang, Lin Shang, Hai State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)9789811919213

With the inherent advantages of material, SiC MOSFET is promising in many applications. There is much research on failure analysis of SiC MOSFET under extreme conditions. A comprehensive review is critical to provide reference for weak locations of chip in device design or application stage. Under three types of extreme conditions of high temperature, high frequency and irradiation, the failure mechanism and mode, characterization, withstand capability and factors affecting reliability are reviewed in detail. The analysis of failure mechanism can provide a basis for chip designers to improve chip performance for specific operating conditions, and provide device users with advice on circuit design. A clear safe working area allows practitioners to maximize the performance of the device. The methods to improve reliability of SiC MOSFET are proposed at the end of the paper. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Irradiation

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Design and Analysis of a Stator Excitation Solid Rotor Machine for Flywheel Energy Storage 3

Design and Analysis of a Stator Excitation Solid Rotor Machi...

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3rd IEEE China International Youth Conference on Electrical engineering, CIYCEE 2022

作者： Ye, Caiyong Chen, Yangsheng Yu, Dezuan Liu, Kaifeng Wan, Shanming School of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China

ISBN: (数字)9781665477321

ISBN: (纸本)9781665477321

The application of flywheel energy storage device is limited owing to its complex structure, high cost and low reliability of magnetic bearings. This paper presents a novel topology structure of the stator excitation solid rotor machine (SE-SRM) for flywheel energy storage system, which integrates flywheel, motor and axial magnetic bearing, with the advantages of high integration, compact structure and high reliability. Firstly, the basic structure and work principle of the SE-SRM were introduced. Secondly, because of the complex geometry of the motor, which is difficult to design and optimize through finite element directly, the magnetic network model was established for modeling and analyzing to improve the design efficiency, and a new method for solving the Carter's coefficient for sinusoidal slot rotors was proposed. Finally, the results of finite element model and no-load experiment of prototype were compared and analyzed, and the correctness of the magnetic network model is proved. © 2022 IEEE.

关键词： Stators

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Radiation Curing Curved Surface Algorithm of Electron Curtain Accelerator 3

Radiation Curing Curved Surface Algorithm of Electron Curtai...

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3rd IEEE China International Youth Conference on Electrical engineering, CIYCEE 2022

作者： Li, Shiyu Yuan, Jushigang Zou, Jiabao Huang, Jiang School of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China

ISBN: (数字)9781665477321

ISBN: (纸本)9781665477321

In order to achieve carbon peaking and carbon neutrality goals, electron beam curing has broad application prospects in the field of modern coatings due to its green efficiency and no need for photoinitiators. The current electron beam curing devices are usually aimed at flat materials, such as thin films, wood boards and other materials, and there are few studies on electron beam curing for curved materials. In this paper, the surface radiation curing algorithm is studied, and the feasibility of the algorithm is verified by simulation, which opens up a new application prospect for the field of electron beam curing. © 2022 IEEE.

关键词： Electrons

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Cooperative Compensation Strategy Based on Dual Power Converters for Standalone BDFIGs with Heavy Load Disturbance

Cooperative Compensation Strategy Based on Dual Power Conver...

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2022 International Conference on Electrical Machines, ICEM 2022

作者： Liu, Yi Zhang, Yizheng Xu, Wei Jiang, Juncai Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan430074 China

ISBN: (数字)9781665414326

ISBN: (纸本)9781665414326

The traditional control strategies for brushless doubly-fed induction generator (BDFIG) operating in standalone mode are without satisfactory dynamic performance under heavy load disturbance. This paper proposes a new dual-converter cooperative compensation strategy, which adopts the machine-side converter (MSC) and the load-side converter (LSC) to compensate for the changes in the power winding (PW) active and reactive currents, respectively. As a result, the dual-converter cooperative compensation strategy can make full use of the redundant capacity of MSC and LSC to compensate for the load disturbance. The proposed strategy is verified on the 3-kVA BDFIG experimental platform with heavy load disturbance at typical operation speeds. © 2022 IEEE.

关键词： Asynchronous generators

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Design and Error Analysis of Energy Monitoring Devices Using FLUKA 3

Design and Error Analysis of Energy Monitoring Devices Using...

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3rd IEEE China International Youth Conference on Electrical engineering, CIYCEE 2022

作者： Yuan, Jushigang Chen, Taiyan Li, Shiyu Zou, Jiabao Zhang, Gefei Huang, Jiang School of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China

ISBN: (数字)9781665477321

ISBN: (纸本)9781665477321

Beam energy is one of the main parameters of the irradiation accelerator. In this paper, a novel electron collecting device for real-time beam energy monitoring is proposed. The measurable range of the energy measurement equipment was estimated for different structural characteristics using FLUKA. The errors induced by the operation of the monitoring device and the parameters of the measured accelerator during the measurement were also investigated. The simulation results show that the thicker the upper plate, the larger the observable energy range, and increasing the sidewall height increases the measured energy range even more. The error caused by the energy divergence of the Gaussian distribution is less than 2.5%. The measurement results can only represent the placement height within ±5 cm. The placement position cannot deviate from the center position ±5 cm. This research provides a reference for the design and error analysis of beam energy measurement devices. © 2022 IEEE.

关键词： Monte Carlo methods

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Design and Simulation of the Control grid for an Electron Curtain Accelerator 3

Design and Simulation of the Control grid for an Electron Cu...

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3rd IEEE China International Youth Conference on Electrical engineering, CIYCEE 2022

作者： Zou, Jiabao Yuan, Jushigang Li, Shiyu Huang, Jiang School of Electrical and Electronic Engineering Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan430074 China

ISBN: (数字)9781665477321

ISBN: (纸本)9781665477321

The control grid is an important part of the electron curtain accelerator, and its structure and parameters seriously affect the trajectory of the electron beam, which in turn has a certain impact on the beam uniformity and transmission efficiency. In this paper, the transverse electron curtain accelerator model is established, the electron beam trajectory is simulated by CST particle studio, the beam loss in the transmission process is analyzed, and the effects of the control grid structure and parameters of the electron curtain accelerator on the beam uniformity and transmission efficiency are studied. The results show that the overall effect of hexagonal mesh array control grid is better. When the control grid voltage is 100V, the diameter of the hexagonal inscribed circle of the control grid mesh is 4mm, and the distance between the control grid and the center of the reflector is 3.5mm, the beam uniformity and beam transmission efficiency are 94.84% and 0.722 respectively. While the uniformity can meet industrial application standards, it can also maintain a good beam transmission efficiency. The research results of this paper will provide reference and theoretical basis for the design and optimization of electron curtain accelerator. © 2022 IEEE.

关键词： Electrons

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