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Defect Engineering of Carbons for Energy Conversion and Storage Applications

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Energy & Environmental Materials 2023年第3期6卷 264-285页

作者： Xianyou Luo Heng Zheng Wende Lai Ping Yuan shengwei li De li Yong Chen Guangdong Key Laboratory for Hydrogen Energy Technologies School of Materials Science and Hydrogen EnergyFoshan UniversityFoshan 528000China State Key Laboratory of Marine Resource Utilization in South China Sea Hainan Provincial Key Laboratory of Research on Utilization of Si-Zr-Ti ResourcesHainan UniversityHaikou 570228China Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) Nankai UniversityTianjin 300071China

Sustainable energy conversion and storage technologies are a vital prerequisite for neutral future *** this end,carbon materials with attractive features,such as tunable pore architecture,good electrical conductivity,outstanding physicochemical stability,abundant resource,and low cost,have used as promising electrode materials for energy conversion and *** engineering could modulate the structures of carbon materials,thereby affecting their electronic *** presence of defects on carbons may lead to asymmetric charge distribution,change in geometrical configuration,and distortion of the electronic structure that may result in unexpected electrochemical *** this review,recent advances in defects of carbons used for energy conversion and storage were examined in terms of types,regulation strategies,and fine characterization means of *** applications of such carbons in supercapacitors,rechargeable batteries,and electrocatalysis were also *** perspectives toward the development of defect engineering carbons were *** all,novel insights related to improvement in high-performance carbon materials for future energy conversion and storage applications were provided.

关键词： carbon materials defect engineering electrocatalysis rechargeable batteries supercapacitors

Advancing knowledge of plasma spraying coatings for li||Sb-Sn liquid metal batteries by X-ray micro-CT

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Chinese Chemical Letters 2023年第7期34卷 308-312页

作者： Kaixuan Cui Ping li Wang Zhao Chunrong liu Qi Wan shengwei li Xuanhui Qu Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China Beijing Key Laboratory of Membrane Materials and Engineering Department of Chemical EngineeringTsinghua UniversityBejing 100084China Institute of Science and Technology China Three Gorges CorporationBeijing 100038China School of Materials Science and Engineering Southwest University of Science and TechnologyMianyang 621010China Shanxi Beike Qiantong Energy Storage Science and Technology Research Institute Co. Ltd.Gaoping 048400China

The performance of li||Sb-Sn liquid metal batteries(LMBs) is hindered by the corrosion of the Sb-Sn cathode on its current collector. Herein, a uniform, dense, and low-oxidized W coating was prepared by plasma spraying, which can effectively resist the corrosion of the cathode and improve the cycle stability of the li||Sb-Sn LMBs. For the first time, micro-CT nondestructive inspection is applied in the field of LMBs. The corrosion micromorphology and composition evolution of the SS304 matrix and Sb-Sn cathode with or without the plasma-sprayed W coating is obtained without disassembling the battery, which proves that the W coating can effectively protect the SS304 matrix. Our autonomous new LMB device for nondestructive inspection is universal and can be applied to different LMBs systems for advancing knowledge of corrosion mechanism and protection. This work guarantees the ability to directly visualize the inner critical positions in three dimensions and fills the knowledge gap in the field of LMB detection technology.

关键词： liquid metal batteries Sb-Sn corrosion Plasma-sprayed W coating SS304 matrix Micro-CT nondestructive inspection

Shear resistance characteristics and influencing factors of root-soil composite on an alpine metal mine dump slope with different recovery periods

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Journal of Mountain Science 2024年第3期21卷 835-849页

作者： PANG Jinghao liANG Shen liU Yabin li shengwei WANG Shu ZHU Haili li Guorong HU Xiasong Department of Geological Engineering Qinghai UniversityXining 810016China Key Laboratory of Genozoic Resource&Environment in North Margin of the Tibetan Plateau Xining 810016China

Artificial vegetation restoration is the main measure for vegetation restoration and soil and water conservation in alpine mine dumps on the Qinghai-Tibet Plateau,***,there are few reports on the dynamic changes and the influencing factors of the soil reinforcement effect of plant species after artificial vegetation restoration under different recovery *** selected dump areas of the Delni Copper Mine in Qinghai Province,China to study the relationship between the shear strength and the peak displacement of the root-soil composite on the slope during the recovery period,and the influence of the root traits and soil physical properties on the shear resistance characteristics of the root-soil composite via in situ direct shear *** results indicate that the shear strength and peak displacement of the rooted soil initially decreased and then increased with the increase of the recovery *** shear strength of the rooted soil and the recovery period exhibited a quadratic function *** is no significant function relationship between the peak displacement and the recovery *** positive correlations(Plinear correlations(P0.05)between the shear strength of the root-soil composite and the root length density,and the root volume ratio of the coarse roots to the fine roots.A significant negative linear correlation(P0.05)with the root traits,other soil physical property indices(the moisture content and dry density of the soil),and slope *** coarse-grain content is the main factor controlling the peak displacement of the rooted soil.

关键词： Alpine mine dump Artificial vegetation restoration period Rooted soil Shear resistance characteristics Root traits Soil physical properties

Numerical simulation of spatial distributions of mining-induced stress and fracture fields for three coal mining layouts

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Journal of Rock Mechanics and Geotechnical Engineering 2018年第5期10卷 907-913页

作者： shengwei li Mingzhong Gao Xiaojun Yang Ru Zhang li Ren Zhaopeng Zhang Guo li Zetian Zhang Jing Xie State Key Laboratory of Hydraulics and Mountain River Engineering College of Water Resource and Hydropower Sichuan University State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and Technology MOE Laboratory of Deep Underground Science and Engineering College of Architecture and Environment Sichuan University China Three Gorges Projects Development Co. Ltd.

In this study, the spatial distributions of stress and fracture fields for three typical underground coal mining layouts, Le, non-pillar mining （NM）, top-coal caving mining （TCM） and protective coal-seam mining （PCM）, are modeled using discrete element software UDEC, The numerical results show that different mining layouts can lead to different mining-induced stress fields, resulting in diverse fracture fields, For the PCM, the mining influenced area in front of the mining faces is the largest, and the stress concentration factor in front of the mining faces is the lowest, The spatial shapes of the mining-induced fracture fields under NM, TCM and PCM differ, and they are characterized by trapezoidal, triangular and tower shapes, respectively, The fractal dimensions of mining-induced fractures of the three mining layouts decrease in the order of PCM, TCM and NM, It is also shown that the PCM can result in a better gas control effect in coal mines with high outburst potential, The numerical results are expected to provide a basis for understanding of mining-induced gas seepage fields and provide a reference for high- efficiency coal mining,

关键词： Coal mining Mining layouts Mining-induced stress field Mining-induced fracture field Numerical simulation

Effect of movability of water on the low-velocity pre-Darcy flow in clay soil

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第8期16卷 3299-3310页

作者： Hui Cheng Fugang Wang shengwei li Xiaotong Guan Guohua Yang Zhongle Cheng Ceting Yu Yilong Yuan Guanhong Feng Key Laboratory of Groundwater Resources and Environment Ministry of EducationJilin UniversityChangchun130012China Jilin Provincial Key Laboratory of Water Resources and Water Environment Jilin UniversityChangchun130012China Chengdu Center China Geological SurveyChengdu610081China

Water seepage in soil is a fundamental problem involving various scientific and engineering *** to the literature,low-velocity water seepage in low-permeability porous media,such as clay,does not follow Darcy's law,also known as pre-Darcy *** formation of immovable water due to water adsorption on the pore wall is believed to be responsible for the formation of pre-Darcy ***,this view lacks direct solid *** investigate the pre-Darcy water flow in clay,head permeability experiments are conducted on six clay samples with different *** results indicate that water seepage in clay at low hydraulic gradients does not follow Darcy's law.A clear nonlinear relationship between flow velocity and hydraulic gradient is *** flow in clay can be divided into the pre-Darcy flow and Darcy flow regions by the critical hydraulic gradient,which is 10-12 for the Albic soil with dry density between 1.3 g/cm^(3)and 1.8 g/cm^(3).According to the disjoining pressure theory,immovable water due to water adsorption on the pore wall is the primary reason for water flow deviating from Darcy's law in *** results indicate that the percentage of movable water ranges from 39.7%to 59.3%for the six samples at a hydraulic gradient of *** the hydraulic gradient increases,the percentage of moveable water also ***,there is a strong correlation between the percentage of movable water and the variation in hydraulic conductivity with the hydraulic ***,a quantitative relationship between the percentage of movable water and the hydraulic conductivity has been *** results of this study suggest that water adsorption on the pore wall not only affects the water movability,but is also closely related to the pre-Darcy flow phenomenon in clay.

关键词： Pre-Darcy flow Clay Critical hydraulic gradient Water movability analysis

考虑过充/过放的电化学储能电站建模及故障特性分析

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电力系统自动化 2024年第14期48卷 119-128页

作者：李斌李博睿李超李盛伟杨赫天津大学电气自动化与信息工程学院天津市300072 国家储能技术产教融合创新平台天津市300354 国网天津市电力公司天津市300010

随着电化学储能的广泛应用,其已成为解决可再生能源并网问题的热门方案之一。然而,储能电站的充放电模式转换及不同的运行控制策略等,将导致电网故障特征更为复杂。为全面、深入地分析储能电站的并网故障特征,文中基于实际的储能电站拓... 详细信息

随着电化学储能的广泛应用,其已成为解决可再生能源并网问题的热门方案之一。然而,储能电站的充放电模式转换及不同的运行控制策略等,将导致电网故障特征更为复杂。为全面、深入地分析储能电站的并网故障特征,文中基于实际的储能电站拓扑结构和运行控制策略,建立了电化学储能电站仿真模型,模拟在常规充/放电、故障穿越、过充/过放等不同工况下储能电站的动态响应过程。在此基础上,明确了储能电站在常规充/放电和过充/过放场景下的故障特性差异,分析了产生差异的决定因素。最后,基于PSCAD/EMTDC仿真平台完成了所建模型的功能性验证,研究结果为了解储能电站的工作原理、研究储能电站的并网控制策略及保护方案提供了借鉴。

关键词：电化学储能电站建模故障特性分析过充/过放故障穿越

Practical Dynamic Security Region Based on Phase Trajectory

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Energy and Power Engineering 2017年第4期9卷 503-514页

作者： Yi Gao Jiangtao Chang Chao Qin Yuan Zeng Yingying liu shengwei li State Grid Tianjin Power Economics & Technology Research Institute Tianjin China Key Laboratory of Smart Grid of Ministry of Education Tianjin University Tianjin China

A fast method based on the phase trajectory to compute DSR is developed. Firstly, the phase trajectory sensitivity has more linear effect than power angle sensitivity. According to the phase trajectory boundary function, controlling unstable equilibrium generators could be identified. The PDSR is finally obtained by the sensitivity analysis between the phase and generators’ active power. Test results on the New England 10-genrator 39-bus system are presented and prove the effectiveness of this approach.

关键词： The Phase Trajectory Sensitivity Analysis Controlling Unstable Equilibrium Mode PDSR

A Transformer Replacement Decision Method Based on Probability Assessment of Failure Rate

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Energy and Power Engineering 2017年第4期9卷 748-755页

作者： Gang liang shengwei li Yan Qi Jing Cao Yi Hao Wenfu Chen State Grid Tianjin Dongli Electric Power Supply Company Tianjin China State Grid Tianjin Economic Research Institute Tianjin China Tianjin Electric Power Research Institute Tianjin China State Grid Tianjin Dispatching and Control Center Tianjin China

Reasonable probability assessment of transformer failure rate (FR) is a critical reference to the transformer replacement work. At present, the lack of support theory for transformer replacement usually causes reliability and economy issues for power companies. For this reason, a transformer replacement decision method based on probability assessment of FR is proposed. Firstly, a first order model of transformer paper degradation is proposed. Then, the Weibull Distribution is used by Monte Carlo Simulation (MCS) to generate the variations of Degree of Polymerization (DP) along with time based on the historical data, and the transformer FR is determined. When the FR is higher than a pre-defined threshold value, the transformer should be replaced for reliability purpose. Finally, the effectiveness of the proposed method for the transformer replacement decision is verified by a typical engineering application.

关键词： Transformer Replacement Probability Assessment Weibull Distribution Degree of Polymerization

冻融循环作用下寒旱区盐渍土中水、盐迁移研究综述

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水利水电技术 2020年第9期51卷 205-215页

作者：李生伟中国地质大学(北京)工程技术学院北京100084 青海大学地质工程系青海西宁810016

盐渍土在冻融循环作用下会发生水盐迁移,造成土体结构破坏及强度损伤,给工程建设造成危害。为深入认识和总结盐渍土水盐迁移规律、影响、治理措施等研究成果,分别对盐渍土室内试验、现场试验、土体病害机理及改良措施等的现状、结果、... 详细信息

盐渍土在冻融循环作用下会发生水盐迁移,造成土体结构破坏及强度损伤,给工程建设造成危害。为深入认识和总结盐渍土水盐迁移规律、影响、治理措施等研究成果,分别对盐渍土室内试验、现场试验、土体病害机理及改良措施等的现状、结果、问题进行了简要回顾和总结,讨论了土体含水量、含盐量、盐分种类、荷载、温度、干密度等对水盐迁移的影响及影响程度,重点介绍了基于自然环境下的水盐迁移试验所取得的水盐迁移运动分布特征、土层温度场变化特征方面等研究成果,并指出水、热、盐、力四场耦合因素下的试验研究是未来盐渍土研究的方向。冻融循环作用下的盐渍土的水盐迁移作用会导致土体盐-冻胀现象,进而引起盐渍土物理力学性质变化,而相关研究表明充分运用地基加固、固化剂加固和温度控制等措施隔绝水盐运移通道、减小温度对土体的干扰可以实现对盐渍土的治理和改良。

关键词：盐渍土水盐迁移温度土壤改良冻胀盐胀抗剪强度变形