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Hospitals & Health Networks
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  • PLL-Free Voltage Oriented Control Strategy for Voltage Source Converters
           Tied to Unbalanced Utility Grids
    • Authors: Liansong Xiong, Binbing Wu, Xiaokang Liu, Liancheng Xiu, Dongjie Wang
      Abstract: Asymmetrical working conditions of the utility grid introduce the large-amplitude negative-sequence component to the output current of the voltage source converter (VSC), causing power semiconductor devices to suffer from thermal fatigue and thermal damage. Though the conventional phase-locked loop (PLL) based voltage oriented control (VOC) solution can suppress the steady-state negative-sequence current effectively, it has a weak suppression ability of transient overload current, and even aggravates the transient current asymmetry and causes more severe transient impact to the VSC. This paper first analyzes the transient performance of the conventional VOC strategy, especially its dynamic response time and the main factors for performance limitation. On this basis, the PLL-free VOC strategy for VSCs tied to unbalanced grids is proposed, and its critical parts, namely, the reference current calculation and the fast detection of the grid voltage sequence components, are implemented. Besides, to improve the frequency adaptability, a high-performance grid frequency detection strategy is developed based on the difference-frequency phase caused by the frequency variation. Finally, experiments are performed to verify the effectiveness and advancement of the proposed method. Specifically, the results proved the rapidity, accuracy, and frequency adaptability of the proposed method in suppressing the VSC negative-sequence current, both in transient and steady-state conditions.
      PubDate: 2022-02-04T00:00:00Z
       
  • Study on Dynamic Process Characteristics of CHP Unit With Variable Load
           Based on Working Point Linearization Modeling
    • Authors: Yuehua Huang, Qing Chen, Jing Ye, Tianlin Lu
      Abstract: In view of the difficulty of applying the refine modeling of combined heat and power (CHP) units to the optimization scenario of integrated energy system, a CHP unit model based on working point linearization modeling is proposed, and its variable load characteristics are analyzed. Firstly, the dynamic coupling relationship of CHP unit is analyzed, and the nonlinear dynamic model of the unit is constructed. Then, under the pure condensation and heating conditions, the linearized Laplace transform model of the working point is established, and the variable load capacity under the independent action of control variables is analyzed to test the availability of the Laplace model. On this basis, the dynamic adaptive particle swarm optimization algorithm is used for multivariable cooperative control to test the open-loop characteristics of the variable load capacity of the unit. At the same time, the control strategy of electrothermal cooperation and safety self-test is designed to adjust the control variables, and test the closed-loop characteristics of the unit’s regulation ability. Finally, a 300-MW steam extraction CHP unit is taken as an example to verify the applicability of the unit model and the effectiveness of the control strategy.
      PubDate: 2022-02-04T00:00:00Z
       
  • Valorization of Wet Oily Petrochemical Sludge via Slow Pyrolysis:
           Thermo-Kinetics Assessment and Artificial Neural Network Modeling
    • Authors: Salman Raza Naqvi, Syed Ali Ammar Taqvi, Asif Hussain Khoja, Imtiaz Ali, Muhammad Taqi Mehran, Wasif Farooq, Nakorn Tippayawong, Dagmar Juchelková, A.E. Atabani
      Abstract: Oily sludge is a hazardous waste stream of oil refineries that requires an effective process and an environment-friendly route to convert and recover valuable products. In this study, the pyrolytic conversion of the wet waste oil sludge was implemented in an autoclave pyrolyzer and a thermogravimetric analyzer (TGA) at 5°C/min, 20°C/min, and 40°C/min, respectively. The kinetic analysis was performed using model-free methods, such as Friedman, Kissenger–Akahira–Sunose (KAS), and Ozawa–Flynn–Wall (OFW) to examine the complex reaction mechanism. The average activation energy of wet waste oil sludge (WWOS) estimated from Friedman, KAS, and OFW methods was 198.68 ± 66.27 kJ/mol, 194.60 ± 56.99 kJ/mol, and 193.28 ± 54.88 kJ/mol, respectively. The activation energy increased with the conversion, indicating that complex multi-step processes are involved in the thermal degradation of WWOS. An artificial neural network (ANN) was employed to predict the conversion during heating at various heating rates. ANN allows complex non-linear relationships between the response variable and its predictors. nH, ΔG, and ΔS were found to be 191.26 ± 2.82 kJ/mol, 240.79 ± 2.82 kJ/mol, and −9.67 J/mol K, respectively. The positive values of ΔH and ΔG and the slightly negative value of ΔS indicate the endothermic nature of the conversion process, which is non-spontaneous without the supply of energy.
      PubDate: 2022-02-04T00:00:00Z
       
  • Quantitative Analysis of the Interactive Influence for Harmonic Emission
           in Wind Farms
    • Authors: Jinhui Shi, Wei Chen, Zhanhong Wei, Xiping Pei, Xuebo Sun
      Abstract: In the process of integrating large-scale wind farms into the power system, the harmonic interaction among wind farms causes potential safe and stable operation threats to the power grid. To effectively control the harmonics of the wind power grid-connected system, quantitative analysis of the harmonic interaction is very necessary and meaningful. Therefore, this paper firstly explains the harmonic interaction among wind farms from the perspective of the primary and secondary emission. We use the concept of harmonic impedance to analyze the mechanism of harmonic interaction and proposed a calculation method for quantitative analysis of the harmonic interaction. Using the calculation method, the influence caused by the wind farm self-impedance, the contact impedance, and Static Var Generator to the harmonic interaction are quantitatively analyzed. Finally, taking multiple wind farms in actual operation as a case, the effectiveness of the method is verified by time domain simulation.
      PubDate: 2022-02-04T00:00:00Z
       
  • Unified Active and Reactive Power Coordinated Optimization for Unbalanced
           Distribution Networks in Radial and Looped Topology
    • Authors: Yuanjing Zeng, Yang Wang, Peishuai Li
      Abstract: Facing the high proportion of distributed generations incorporating in a single phase, the active distribution network has become more unbalanced with flexible topology. In this paper, a unified active and reactive power coordinated optimization (ARPCO) method, which is applicable in both radial and looped unbalanced distribution networks, is proposed. Aiming to reduce power losses and restrain undervoltage and overvoltage problems, the ARPCO model which regulates the active and reactive power output of distributed generations coordinately and optimally is constructed. A novel trust region sequential linear programming (SLP) method, which is effective in nonlinear and nonconvex model solving, is developed and employed in APRCO model solution. A multi-scenario case study based on the modified IEEE 123 node distribution system shows that the proposed method is able to reduce the system active power loss and solve undervoltage and overvoltage problems efficiently, at the same time maximizing the utilization of distributed generations.
      PubDate: 2022-02-04T00:00:00Z
       
  • Wind Power Prediction Based on a Hybrid Granular Chaotic Time Series Model
    • Authors: Yanyang Wang, Wei Xiong, Shiping E., Qingguo Liu, Nan Yang, Ping Fu, Kang Gong, Yu Huang
      Abstract: For realizing high-accuracy short-term wind power prediction, a hybrid model considering physical features of data is proposed in this paper, with consideration of chaotic analysis and granular computing. First, considering the chaotic features of wind power time series physically, data reconstruction in chaotic phase space is studied to provide a low-dimensional input with more information in modeling. Second, considering that meteorological scenarios of wind development are various, complicated, and uncertain, typical chaotic time series prediction models and wind scenarios are analyzed correspondingly via granular computing (GrC). Finally, through granular rule-based modeling, a hybrid model combining reconstructed wind power data and different models is constructed for short-term wind power prediction. Data from real wind farms is taken for experiments, validating the feasibility and effectiveness of the proposed wind power prediction model.
      PubDate: 2022-02-04T00:00:00Z
       
  • A Spatial Assessment of Wildfire Risk for Transmission-Line Corridor Based
           on a Weighted Naïve Bayes Model
    • Authors: Kunxuan Xiang, You Zhou, Enze Zhou, Junhan Lu, Hui Liu, Yu Huang
      Abstract: In order to improve the wildfire prevention capacity of transmission lines, a wildfire risk assessment method for transmission-line corridors based on Weighted Naïve Bayes (WNB) is proposed in this paper. Firstly, the importance of 14 collected types of wildfire-related factors is analyzed based on the information gain ratio. Then, the optimal factors set and the most accurate sampling table are constructed by deleting the factors in the lowest order of importance one by one. Finally, the performance of the WNB model is compared to that of NB and BNW models according to the ROC curve and visualization. A total of 76.36% of fire events in 2020 fell in high-risk and very-high-risk regions, indicating the acceptable accuracy of the proposed assessment method of wildfire risk.
      PubDate: 2022-02-04T00:00:00Z
       
  • Three-Dimensional Numerical Analysis of Longitudinal Thermoacoustic
           Instability in a Single-Element Rocket Combustor
    • Authors: Guo Kangkang, Xu Boqi, Ren Yongjie, Tong Yiheng, Nie Wansheng
      Abstract: This study numerically investigated the thermoacoustic combustion instability characteristics of a scaled rocket combustor based on a hybrid of the Reynolds-averaged Navier–Stokes and large–eddy simulation method. The turbulence–combustion interactions were treated using flamelet generated manifold approach. An unstable case was simulated with detailed reaction mechanisms (GRI-Mech 3.0). The obtained results agree well with experiment data from Purdue University, in terms of pressure oscillations frequency and power spectral density spectrum. The combustion instability mode was identified to be coupled with the first longitudinal acoustic mode of the combustion chamber by dynamic model decomposition method. According to Rayleigh index analysis, the unstable driving source was found to be located near the combustor step, which was further confirmed by time-averaged flow fields. Detailed three-dimensional vortex ring shedding evolutions at the combustor step were tracked with fine time resolution. Results indicate that the combustion instability arises from periodic vortex ring shedding at the combustor step and interacting with the chamber wall. The unburnt reactants were rolled up by the shedding vortex ring, which would not break up until impact with the chamber wall. Therefore, the mixing performance was significantly enhanced, leading to sudden heat release. Consequently, the thermal energy is added to the acoustic field, and the first longitudinal mode is thus reinforced, giving rise to large amplitude axial velocity oscillations which prompt the generation of the new vortex ring. The results of the present investigation will support the design and development of high-performance rocket engines.
      PubDate: 2022-02-04T00:00:00Z
       
  • SMO-Based Sensorless Control of a Permanent Magnet Synchronous Motor
    • Authors: Xin Liu, Zhiwei Wang, Wenzhuo Wang, Yunling Lv, Bo Yuan, Shijie Wang, Wujing Li, Qiufang Li, Qiwen Zhang, Qianchang Chen
      Abstract: In order to reduce the chattering caused by the discontinuity of the control function in the traditional sliding mode observer (SMO), this article proposes a sliding mode observer with phase-locked loop (PLL) to estimate the speed and position of the rotor. The back electromotive force (EMF) of a permanent magnet synchronous motor (PMSM) in a static coordinate system is accurately estimated by SMO, and then, PLL is constructed to combine the observed rotor position angle and back EMF to compensate the phase lag in angle estimation so as to obtain a more accurate speed. It solves the problems of poor robustness and complex algorithms in the traditional SMO prediction algorithm. The simulation results show that the SMO with PLL can effectively reduce the system chattering and effectively improve the accuracy of rotor speed and position estimation.
      PubDate: 2022-02-04T00:00:00Z
       
  • Influence of the Assembly Method on the Cell Current Distribution of
           Series–Parallel Battery Packs Based on Connector Resistance
    • Authors: Long Chang, Chen Ma, Chunxiao Luan, Zhezhe Sun, Cunyu Wang, Hongyu Li, Yulong Zhang, Xiangqi Liu
      Abstract: In order to meet the energy and power requirements of large-scale battery applications, lithium-ion batteries have to be connected in series and parallel to form various battery packs. However, unavoidable connector resistances cause the inconsistency of the cell current and state of charge (SoC) within packs. Meanwhile, different assembly methods and module collector positions (MCPs) may result in different connector resistance arrangements, thereby leading to different cell current distributions. Therefore, the correlation of connector resistance to battery pack performance is worth investigating. Based on the simplified equivalent circuit model (ECM), the mathematical models of cell current distribution within packs under different assembly methods are obtained in this paper. Then, we use COMSOL Multiphysics simulation to analyze the guidelines of series assembly for parallel modules and then study the influences of connector resistance and MCP on series–parallel battery packs. The results show that the assembly method with an equal distance between each cell and the assembly contact surface for series assembly can effectively reduce the inhomogeneous current. However, the cell current and SoC distribution within the series–parallel battery pack is completely independent of the Z-configuration and ladder configuration. In addition, for series–parallel battery packs, the non-edge parallel module part of the series–parallel battery pack can be replaced with a series cell module (SCM) structure. Finally, the influences of the value of the connector resistance and current rate on the cell current distribution are discussed.
      PubDate: 2022-02-04T00:00:00Z
       
  • Research on Fire Prediction Method of High-Voltage Power Cable Tunnel
           Based on Abnormal Characteristic Quantity Monitoring
    • Authors: Chenying Li, Jie Chen, Ziheng Pu, Fengbo Tao, Jianjun Liu, Xiao Tan, Libin Hu, Jingxing Cao
      Abstract: The proportion of cable lines in the urban distribution network is increasing. The fire hazard of important cable channels is prominent, which has a serious effect on the safety and stable operation of the power system. In recent years, intelligent mobile inspection and fire extinguishing devices have been applied in tunnels. The determination of firepower and location is conducive to the rapid and effective fire suppression of intelligent devices. Therefore, this study proposes a fire early warning method of a high-voltage power cable tunnel based on abnormal characteristic quantity monitoring. Based on the modified model of complex pyrolysis and combustion chemical reaction, the fire development of different fire source powers and fire locations is simulated. The temperature distribution and characteristic gas concentration under different simulation conditions are analyzed. The results show that the monitoring data of temperature, flue gas concentration, and CO and CO2 concentration need comprehensive analysis to effectively reflect different fire conditions. The characteristic data set is selected and processed to form a total sample. The fire prediction model is trained and tested. The accuracy of the proposed prediction model is 92%.
      PubDate: 2022-02-04T00:00:00Z
       
  • Study of the Performance of a Thermoelectric Refrigeration Membrane Cold
           Chamber Distillation Component
    • Authors: Junhu Hu, Shunli Wu, Hao Liu, Xiaohong Yang
      Abstract: Thermoelectric Refrigeration Membrane Distillation (TERMD) is an emerging membrane-based evaporation technology with excellent prospects for separation industries. However, the development of the TERMD system was further limited by excellent membrane component properties. In this paper, a cold chamber component of a TERMD is manufactured. Then, the cooling performance of the component is studied to examine the coupling between the Thermoelectric Refrigeration (TER) and the Membrane Distillation (MD) process. Moreover, the effects of the membrane components properties are studied by changing the water flow rate, and the input current of thermoelectric refrigeration. The results showed that when the TERMD cold room inlet current is maintained stable and the heat dissipation intensity increases, the cooling temperature gradually decreases. Also, the temperature on the cold side tends to stabilize while the flow rate exceeds 600 L/h. In addition, the input power decreases as the heat dissipation intensity increases in the cooling dissipation intensity of the Thermoelectric Refrigeration Component (TERC) cold chamber is kept stable. And, the input power will reach a critical value while the water volume flow rate is over 500 L/h. Furthermore, the cooling rate reaches the maximum of 1.59 at the water volume flow rate of 700 L/h while the operating current of the TERC is 12 A. It is concluded that the thermoelectric refrigeration component can supply great refrigeration power and a high Coefficient of Performance (COP) under small current conditions for the analysis of the thermoelectric performance of the TERC.
      PubDate: 2022-02-04T00:00:00Z
       
  • Ignition and Combustion Characteristics of N-Butanol and FPBO/N-Butanol
           Blends With Addition of Ignition Improver
    • Authors: Yu Wang, Jinlin Han, Noud Maes, Michel Cuijpers, Bart Somers
      Abstract: In this study, the ignition and combustion characteristics of fast pyrolysis bio-oil (FPBO) are investigated in a combustion research unit (CRU), which mainly consists of a constant-volume combustion chamber. To fuel the CRU with FPBO, n-butanol and 2-ethylhexyl nitrate (EHN) are used to improve the atomization and ignition properties of the fuel blends, respectively. In the first part of this study, an appropriate proportion of EHN additive into n-butanol is determined based on the balance between the ignition improvement and the amount of EHN addition. Then, the effects of FPBO content (up to 30%) in FPBO/n-butanol blends with the same EHN addition are investigated. The effects of chamber wall temperature on the combustion are also studied. Finally, the different definitions of indicators are determined from the chamber pressure traces to quantitatively depict fuel ignition and combustion characteristics including ignition delay, combustion phasing, end of combustion and burn duration. Experimental results show that a distinct two-stage ignition process can be observed for all cases. For n-butanol with added EHN, the increase of EHN proportion could effectively advance both the low- and high-temperature reaction phases. However, this gain is obviously reduced when the percentage of EHN becomes higher than 8%. For FPBO/n-butanol blends with an addition of EHN, higher FPBO proportions have little effect on the low-temperature reaction phase, while they delay the high-temperature reaction phase. Chamber wall temperature have a significant influence on the ignition and combustion processes of the tested FPBO/n-butanol blends. With these blends, negative temperature coefficient behavior was observed in a chamber wall temperature range of 535–565°C.
      PubDate: 2022-02-04T00:00:00Z
       
  • A Lightweight Verification Method Based on Metamorphic Relation for
           Nuclear Power Software
    • Authors: Meng Li, Xiaohua Yang, Shiyu Yan, Jie Liu, Yusheng Liu, Jun Sun
      Abstract: The verification of nuclear design software commonly uses direct comparison methods. Benchmark questions, classical programs, experimental data, manual solutions, etc., would be used as expected results to compare with program outputs to evaluate the reliability of software coding and the accuracy of the numerical solution. Because nuclear power software numerically simulates complex physical processes, it involves many partial differential equations. It is usually challenging to construct analytical or accurate solutions and is expensive to develop benchmark questions and experimental data. Hence, the quantity of verification examples is small. By using the direct comparison method, verification is complicated, high cost, and inadequate. Entering the validation process without adequate proof will adversely impact the effectiveness and efficiency of validation. Metamorphic testing is an indirect verification technology that cleverly combines the nature of the model with software verification. It evaluates the correctness of the code by examining whether the program satisfies the metamorphic relation. Without manual solutions or benchmark examples, it has broad application prospects in the field of nuclear power. A lightweight verification method based on metamorphic relation has been produced here. Metamorphic relations are identified from physical equations, numerical algorithms, and program specifications. Next, they are explicitly used to system, integration, and unit tests to improve test adequacy. Because no need to develop verification examples, this method can detect code errors as soon as possible at a low cost, improve test efficiency, avoid mistakes remaining in subsequent stages and reduce the overall cost of verification.
      PubDate: 2022-02-04T00:00:00Z
       
  • Flow Conditioning to Control the Effects of Inlet Swirl on Brush Seal
           Performance in Gas Turbine Engines
    • Authors: Yuxin Liu, Wenlei Dong, John Chew, Michael Pekris, Benzhuang Yue, Xiaozhi Kong
      Abstract: When subject to highly swirling inlet flow, the bristles on the upstream face of a brush seal in gas turbine engines tend to slip circumferentially, which may lead to aeromechanical instability and seal failure. In this article, a new design of the front plate of brush seal, which mitigates this effect, is presented. Angled ribs on the upstream side of the front plate are used to reduce the swirl of the flow impacting on the bristle pack. The effects of the rib geometry, including angle of inclination and height-to-spacing ratio, are investigated using computational fluid dynamics, and a bulk porous medium model of the bristle pack, on a simple seal geometry. Results show that the ribs can effectively regulate the flow upstream of the bristle pack, reducing the swirl and channeling flow radially inward to the sealing section, resulting in decreased circumferential forces on the bristles. Ribs inclined at 20° to the radial direction and with height-to-spacing ratio of 0.4 were selected as the most effective of those investigated for the seal geometry under study. A model of an aeroengine preswirled cooling air chamber was created to give insight into the inlet swirl boundary conditions that a preswirl seal brush seal could be subjected to at a range of leakage flow rates and inlet swirl velocities. The new design and upstream roughness feature substantially reduced inlet swirl velocity incident on the bristle pack. The findings in this work could have a significant impact on brush seal design and, in particular, mitigate a significant operational risk of swirl-induced instability in high-pressure, high-speed shaft seal locations.
      PubDate: 2022-02-03T00:00:00Z
       
  • Research on the Trading Arrangement and Clearing Model of Medium- and
           Long-Term Inter-Provincial Markets Considering Security Constraints
    • Authors: Xueqian Fu, Kaitao Yang, Guodong Li, Dan Zeng
      Abstract: In the process of deepening market-oriented reform, the most important thing in China is building a national unified electricity market system under a high renewable energy penetration scenario. The new round of market-oriented reform proposes to establish an inter-provincial electricity-trading arrangement. Due to imperfect market mechanisms and immature inter-provincial electricity markets, we investigate the electricity market operation system of the national unified electricity market. Existing transmission commitments, trading cycles, market participants, strategic bids, and clearing and settlement mechanisms are analyzed for inter-provincial medium- and long-term markets. For security reasons of interchange schedules, we propose a novel inter-provincial market-clearing model based on static security regions, which consider inter-provincial electricity transmissions and direct current power flows. The proposed market-clearing model is simulated and verified in a 3-bus system and an IEEE 30-bus system. The proposed clearing model and rational market theory are conducive not only to promoting renewable energy consumption but also to improving the linkages between inter-provincial medium- and long-term markets.
      PubDate: 2022-02-03T00:00:00Z
       
  • Decarbonization, Environmental Regulation, and Economic Boom: An Indicator
           Assessment Based on the Industrial Waste
    • Authors: Liu Yang, Zhili Ma, Minda Ma, Yang Xu
      Abstract: Energy-based economic development brings about some environmental problems, and as China’s economy shifts from rapid growth to high-quality development, the implementation of environmental regulation is crucial to achieving environmental protection and high-quality economic development. Based on the panel data of 14 prefectures and cities from 2000 to 2018 in Xinjiang, this study explored the impact of environmental regulation on high-quality economic development by constructing a comprehensive evaluation index system and using entropy method and Tobit regression model. The results show that 1) overall, each 1% increase in environmental regulation is associated with a 0.037% rise in high-quality economic development level; 2) regionally, each 1% increase in environmental regulation is associated with a 0.119% rise in high-quality economic development level in northern Xinjiang, but the effect on the southern Xinjiang is not significant; 3) each 1% increase in environmental regulation, the level of high-quality economic development decreased by 0.034% from 2000 to 2010 and increased by 0.061% from 2011 to 2018. In general, this study adds to the theoretical and empirical study on the influence of environmental regulation on high-quality economic development while providing a methodology for other economies to assess the relationship between the two.
      PubDate: 2022-02-03T00:00:00Z
       
  • Nanoparticles as Depressurization and Augmented Injection Agents to
           Facilitate Low Permeability Reservoir Exploitation: Potentials and Risks
    • Authors: Jiating Chen, Xun Zhong, Fangzhou Xu
      PubDate: 2022-02-03T00:00:00Z
       
  • Distribution Network Voltage Arc Suppression Method Based on Flexible
           Regulation of Neutral Point Potential of the New Grounding Transformer
    • Authors: WU Lifang, BAI Hao, Zhou Ke, Yuan Zhiyong, Yu Xiaoyong, Lei Jinyong, Zou Yu, Zhang Yuan
      Abstract: Aiming at the problems that the existing arc suppression cabinet technology cannot adjust the zero sequence voltage flexibly and the control and hardware implementation of active arc suppression equipment based on power electronics are difficult, a new method of voltage arc suppression in the distribution network based on the flexible regulation of the neutral point potential of the new grounding transformer is proposed. From the perspective of the sequence component, the variation law of the neutral point voltage before and after the closing of the tapped grounding branch of the new grounding transformer is analyzed. By selecting the appropriate initial tap position of the tap-to-ground switch, the fault phase voltage is flexibly controlled so that the fault phase voltage is reduced to below the reignition voltage to quickly solve the influence of the single-phase grounding fault, and the risk of non-fault phase insulation breakdown is reduced to ensure the stable operation of the distribution network. According to the ratio of the fault phase current to the zero sequence voltage before and after the gear inputs, whether the arc suppression of the single-phase grounding fault is completed is judged. Compared with power electronic products, the new grounding transformer has the advantages of high reliability, long service life, and low cost and has strong economy and applicability in engineering. The single-phase grounding fault model of the 10kV distribution network is built in the PSCAD/EMTDC simulation environment, and the new method of the distribution network voltage arc suppression based on the flexible regulation of neutral point potential of the new grounding transformer is verified. The simulation results show that the proposed method can effectively reduce the fault phase voltage to achieve the reliable arc suppression of the single-phase grounding fault.
      PubDate: 2022-02-03T00:00:00Z
       
  • Controlled Lithium Deposition
    • Authors: Simeng Zhang, Gaojing Yang, Xiaoyun Li, Yejing Li, Zhaoxiang Wang, Liquan Chen
      Abstract: Lithium metal is a promising anode material for its low redox potential and high theoretical specific capacity. However, the commercial application of the lithium metal anode is hindered with safety concerns arising from the uncontrolled growth of the lithium dendrites and significant volume variation during the lithium plating and stripping processes. Modification to the current collector is effective in tailoring the morphology of the deposited lithium and improving the cycling performance of the lithium metal batteries This review summarizes at first the global research advances in the structural design and the selection of the current collectors and their textures. It then presents some of our efforts in realizing controlled lithium deposition by designing current collectors in three aspects, lithium deposition induced by the micro-to-nano structures, lithiophilic alloys and iron carbides. Finally, conclusions and prospects are made for the further research of the current collectors.
      PubDate: 2022-02-03T00:00:00Z
       
 
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