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Inorganic Filler Enhanced Formation of Stable Inorganic-Rich Solid Electrolyte Interphase for High Performance Lithium Metal Batteries

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advanced Functional Materials 2023年第29期33卷

作者： Guo, Chi Du, Kang Tao, Runming Guo, Yaqing Yao, Shuhao Wang, Jianxing Wang, Deyu Liang, Jiyuan Lu, Shih-Yuan Key Laboratory of Optoelectronic Chemical Materials and Devices of Ministry of Education Jianghan University Wuhan430056 China Department of Chemistry Institute for Advanced Materials and Manufacturing The University of Tennessee KnoxvilleTN37996 United States State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan430074 China Department of Chemical Engineering National Tsing Hua University Hsinchu30013 Taiwan

Lithium metal (LM) is a promising anode material for next generation lithium ion based electrochemical energy storage devices. Critical issues of unstable solid electrolyte interphases (SEIs) and dendrite growth however still impede its practical applications. Herein, a composite gel polymer electrolyte (GPE), formed through in situ polymerization of pentaerythritol tetraacrylate with fumed silica fillers, is developed to achieve high performance lithium metal batteries (LMBs). As evidenced theoretically and experimentally, the presence of SiO2 not only accelerates Li+ transport but also regulates Li+ solvation sheath structures, thus facilitating fast kinetics and formation of stable LiF-rich interphase and achieving uniform Li depositions to suppress Li dendrite growth. The composite GPE-based Li||Cu half-cells and Li||Li symmetrical cells display high Coulombic efficiency (CE) of 90.3% after 450 cycles and maintain stability over 960 h at 3 mA cm−2 and 3 mAh cm−2, respectively. In addition, Li||LiFePO4 full-cells with a LM anode of limited Li supply of 4 mAh cm−2 achieve capacity retention of 68.5% after 700 cycles at 0.5 C (1 C = 170 mA g−1). Especially, when further applied in anode-free LMBs, the carbon cloth||LiFePO4 full-cell exhibits excellent cycling stability with an average CE of 99.94% and capacity retention of 90.3% at the 160th cycle at 0.5 C. © 2023 Wiley-VCH GmbH.

关键词： Lithium compounds

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A general coordination scheme for zero-sequence current differential protection on series-compensated multi-circuit line 4

A general coordination scheme for zero-sequence current diff...

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4th IEEE Conference on Energy Internet and Energy System Integration, EI2 2020

作者： Huang, Zongchao Li, Yinhong Huazhong University of Science Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9781728196060

The present study of zero-sequence current differential protection (ZCDP) with series compensation has not considered the equivalent impedance characteristic of series compensation, and meanwhile cannot put forward a universal coordination scheme feasible for multi-circuit lines. In this paper, the equivalent impedance characteristic of the series capacitor (SC) device and the effect of SC on the operating characteristics of ZCDP under single-circuit and multi-circuit conditions are analyzed. Based on the analysis, a general coordination scheme for ZCDP on series-compensated multi-circuit line is proposed, of which the presented sensitivity coefficient is able to reflect the sensitivity of current differential protection. A power grid experiment is used to demonstrate the correctness of the analysis and the effectiveness of the proposed scheme. © 2020 IEEE.

关键词： Timing circuits

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Three-Dimensional Solution of electromagnetic Focusing System Based on Double Scalar Potential Method

Three-Dimensional Solution of Electromagnetic Focusing Syste...

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International Conference on Vacuum Electronics

作者： Zhenting Qin Quan Hu Yulu Hu Xiaofang Zhu Bin Li National Key Laboratory of Science and Technology on Vacuum Electronics Key Laboratory of Large-Scale Electromagnetic Industrial Software Ministry of Education School of Electronic Science and Engineering University of Electronic Science and Technology of China Chengdu P. R. China Shenzhen Institute for Advanced Study University of Electronic Science and Technology of China Shenzhen China

ISBN: (数字)9798350348705

ISBN: (纸本)9798350348712

MFS is a magnetostatic solver for PPM system simulation which is widely used by TWT designers in China. However, MFS cannot calculate focusing systems containing both soft magnetic materials and coil materials. To extend its function, the double scalar potential method (DSP) is studied and used to solve the magnetic field distribution of the electromagnetic focusing system. An electromagnetic focusing system is simulated and the results are in good agreement with CST.

关键词： Electric potential Vacuum systems Magnetostatics Focusing Microwave theory and techniques Systems simulation Soft magnetic materials Vacuum electronics Electron sources electromagnetics

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Enhanced Dynamic Phase Stability and Suppressed Mn Dissolution in Low-Tortuosity Spinel LMO Electrode

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能源材料前沿（英文） 2023年第3期2023卷 193-201页

作者： Renjie He Sheng Lei Mengchuang Liu Mingsheng Qin Wei Zhong Shijie Cheng Jia Xie State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic EngineeringHuazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and EngineeringHuazhong 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 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

Microspinel LiMn204(LMO)is a widely used cathode material in power lithium-ion ***,inevitable Mn dissolution and dynamic phase instability will cause the degradation of microspinel LMO during ***,a low-tortuosity LMO(LMO-LT)electrode is fabricated by an ice-templating method,which exhibits enhanced dynamic phase stability,alleviated Mn dissolution,and rare particle microcracks during *** is shown that the low-tortuosity electrode enables fast lithium-ion diffusion and thus small concentration polarization,leading to uniform electrochemical reaction within microregions of the LMO-LT ***,the fast lithium-ion transport kinetics and even mesoscopic scale reactions of the LMO-LT electrode effectively alleviate irreversible phase transition and Mn dissolution as well as suppress crack generation in LMO *** a result,the full cell[negative-to-positive capacity ratio(N/P)=1.1]with thick LMO-LT cathode(13 ***-2)and Li4Ti5O12 anode sustains 80.0％capacity over 200 *** LMO-LT electrode further delivers 78.9％capacity of that at 0.1 C at the high rate of 5 *** work provides an important strategy to enhance dynamic phase stability and suppress Mn dissolution at the mesoscopic scale,promoting the development of high-performance LMO electrodes.

关键词： stability electrode dynamic phase dissolution enhanced low-tortuosity spinel suppressed

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Reinforcement learning for optimal allocation of superconducting fault current limiters

Reinforcement learning for optimal allocation of superconduc...

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2020 IEEE Power and Energy Society General Meeting, PESGM 2020

作者： Ling, Xiejin Li, Yinhong Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9781728155081

Superconducting fault current limiter (SFCL) is a new type of current limiting equipment that can restrict the short circuit current level in power systems without impacting on their normal operations. However, the existing SFCL allocation methods have disadvantages of long computation and unstable convergence. Recent advances in the area of artificial intelligence provide the possibility to achieve the optimal SFCL allocation with the consideration of both speed and convergence. To this end, the SFCL allocation is converted into a Reinforcement Learning (RL) problem in this paper. A designer to find the optimal SFCL allocation is viewed as an agent, and the power system is regarded as the environment. The agent adjusts the location and size of SFCLs to respond to the feedback from the environment optimally. The Q-learning algorithm is applied to solve the RL problem. The experimental results demonstrate the effectiveness and superiority of the proposed method. © 2020 IEEE.

关键词： Reinforcement learning

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A coil optimization design of the horn shape for underwater wireless power transfer 16

A coil optimization design of the horn shape for underwater ...

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16th IET International Conference on AC and DC Power Transmission, ACDC 2020

作者： Zeng, Yingqin Rong, Cancan Lu, Conghui Liu, Xiaobo Liu, Minghai State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781839533914

In the application scenarios of underwater wireless power transfer (WPT), a horn shape coil is proposed in this paper. Aiming to obtain the uniform magnetic field in a specific area, the horn shape coil is optimized by reasonably setting the tilt angle and the spacing of the turns. Moreover, the horn coil with optimal tilt angle and the horn coil with uneven spacing are designed. Considering the eddy current loss in seawater, the model of WPT system in seawater is established using the 3D electromagnetic simulator. Through simulation and analysis of eddy current loss under different conditions, the influence of eddy current loss on efficiency is illustrated. Finally, the transfer efficiency and output power are obtained by simulation and calculation. Also, the performance of the designed system is evaluated. It is found that the proposed system can effectively enhance the stability and anti-offset capability of WPT system, and then obtain the stable and efficient output. © 2020 Institution of engineering and technology. All rights reserved.

关键词： Seawater

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Multifrequency Vibration Suppression of Magnetic Bearing Systems Applied Variable Step-size Automatic Learning Control 12

Multifrequency Vibration Suppression of Magnetic Bearing Sys...

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12th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2020

作者： Sun, Hongbo Jiang, Dong Ding, Jianfu Yang, Jichang Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology Wuhan China

ISBN: (纸本)9781728158266

Active Magnetic Bearing (AMB) has been widely applied in occasions acquire high-speed rotating, high-precision machining, and so on. The AMB can provide active control force to offset centrifugal force and other disturbance to suppress vibration while rotating. This paper proposed a strategy to compensate vibration in AMB system based on Variable Step-size Automatic Learning Control (VALC). Firstly, a two degrees of freedom model of radial AMB is established. Phase error between of centrifugal force and synchronous vibration is analyzed. Then, principle and process of VALC is introduced. A generalized notch filter is applied to obtain synchronous and harmonic vibration. Next, simulations are carried out based on AMB control system applied VALC. The results of simulations show the feasibility of the compensating strategy. Experiments to reduce synchronous and harmonic vibration based on VALC are carried out on a test rig. Spectrums of vibration signals show that vibration is reduced by about 90%, which demonstrates the effectiveness of proposed strategy for vibration compensation. © 2020 IEEE.

关键词： Notch filters

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An Adaptive Driving Signals Delay Control for Voltage Balancing of Series-Connected SiC MOSFETs 12

An Adaptive Driving Signals Delay Control for Voltage Balanc...

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12th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2020

作者： Zhao, Min Lin, Hua Wang, Tao Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology WuHan China

ISBN: (纸本)9781728158266

Voltage unbalance during the switching transient is a challenge of series-connected silicon carbide (SiC) metal-oxide-semiconductor field-effect transistor (MOSFET). Adjusting the delay time of the device's drive signals is an effective method for voltage balancing. However, the relationship between the delay time and the drain-source differential voltage is greatly affected by the load current, so it is difficult for proportional-integral (PI) controller to meet the requirements of practical work situations where the load current changes inevitably. In order to solve this problem, this paper proposes an adaptive control method. This method can adjust the controller's parameters in real time according to the load current, so as to achieve a reliable voltage balancing. Experimental results are presented to verify the practicability and flexibility of this method, meanwhile, the robustness of the system improved by applying this strategy. © 2020 IEEE.

关键词： Silicon carbide

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Small-Signal Stability of MMC Grid-Tied System under Two Typical Unbalanced Grid Conditions 4

Small-Signal Stability of MMC Grid-Tied System under Two Typ...

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4th IEEE China International Electrical and Energy Conference, CIEEC 2021

作者： Zhu, Jianhang Hu, Jiabing Li, Yingbiao Ma, Shicong Wang, Tiezhu Institute of Artificial Intelligence Huazhong University of Science and Technology State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Wuhan China Electric Power Research Institute Power System Department China Beijing China

ISBN: (纸本)9781728171494

The AC transmission network of Modular Multilevel Converters (MMC) usually adapts the overhead line, so the single-phase grounding faults of the AC side are rather general. At this time, the protection system will cut off the fault line for the first time, so there are two unbalance grid conditions (UGCs), i.e. single-phase grounding (SGUGC) and disconnection (SDUGC) during this process. However, the comparative analysis of small-signal stability under two different UGCs has never been involved. Therefore, when ignoring the transient process of faults and protection actions, and considering the inherent properties of the MMC system, two small-signal models based on the linear time-periodic (LTP) theory are built under SGUGC and SDUGC, respectively. Then, the influence of control parameters on the system stability under the two UGCs is compared in detail, and the results provide theoretical support for the control parameters optimization after protection system action. Finally, the detailed nonlinear MMC grid-connected model verifies the analysis results. © 2021 IEEE.

关键词： Signal analysis

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Multicore Fiber-Tip Nanoforce Probes with Temperature Compensation

Multicore Fiber-Tip Nanoforce Probes with Temperature Compen...

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International Conference on Optical Communications and Networks (ICOCN)

作者： Cong Xiong Caoyuan Wang Wei Ji Limin Xiao Advanced Fiber Devices and Systems Group Key Laboratory of Micro and Nano Photonic Structures (MoE) Key Laboratory for Information Science of Electromagnetic Waves (MoE) Shanghai Engineering Research Center of Ultra-Precision Optical Manufacturing School of Information Science and Technology Fudan University Shanghai China

An ultracompact and highly sensitive multicore fiber-tip nanoforce sensor with temperature compensation is demonstrated. The probes enhance the accuracy and reliability of the sensor while significantly reduce the siz... 详细信息

ISBN: (数字)9798350367652

ISBN: (纸本)9798350367669

关键词： Temperature measurement Temperature sensors Optical fiber sensors Accuracy Multicore processing Optical fiber networks Optical variables measurement

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