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How do high-voltage cathode and PEO electrolyte get along well?EIS analysis mechanism&potentiometric control strategy

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Journal of Energy Chemistry 2024年第9期96卷 424-436页

作者： Xiaodong Bai Chaoliang Zheng Heng Zhang Jian liu Panpan Wang Baojia Xia jianling li State Key Laboratory of Advanced Metallurgy University of Science1nd Technology BeijingBeijing 100083China Shanghai Institute of Microsystem1nd Information Technology Chinese Academy of SciencesShanghai 201800China

PEO-based all-solid-state electrolytes are extensively utilized and researched owing to their exceptional safety,low-mass-density,and ***,the low oxidation potential of PEO makes the interface problem with the high-voltage cathode extremely *** this work,the impedance of PEO-based all-solid-state batteries with high-voltage cathode(NCM811)was studied at different *** Nyquist plots displayed a gyrate arc at low-frequencies for NCM811/PEO *** on the kinetic modeling,it was deduced that there is a decomposition reaction of PEO-matrix in addition to de-embedded reaction of NCM811,and the PEO intermediate product(dehydra-PEO)adsorbed on the electrode surface leading to low-frequency inductive ***,the distribution of relaxation time shows the dehydra-PEO results in the kinetic tardiness of the charge transfer process in the temporal ***,an artificial interface layer(CEI_(x))was modified on the surface of NCM811 to regulate the potential of cathode/electrolyte interface to prevent the high-voltage deterioration of ***/CEI_(x)/PEO batteries exhibit capacity retentions of 96.0%,84.6%,and 76.8%after undergoing 100 cycles at cut-off voltages of 4.1,4.2,and 4.3 V,***,here the failure mechanism of high-voltage PEO electrolyte is investigated by EIS and a proposed solving strategy is presented.

关键词： PEo-based electrolyte High-voltage cathode Electrochemical impedance spectroscopy Mechanism research Electrochemical characteristic

Performance measurement and evaluation of an ionic liquid electrospray thruster

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Chinese Journal of Aeronautics 2023年第3期36卷 1-15页

作者： Chengjin HUANG jianling li Mu li School of Power and Energy Northwestern Polytechnical UniversityXi’an 710072China Shenzhen Key Laboratory of Ultraintense Laser and Advanced Material Technology Center for Advanced Material Diagnostic Technologyand College of Engineering PhysicsShenzhen Technology UniversityShenzhen 518118China

As a novel micro-propulsion system for small satellites(from micro to nano),the ionic liquid electro spray propulsion system is a promising ***,performance measurement and evaluation of the Ionic liquid Electrospray Thruster(ILET)is one of the most challenging issues for practical application,due to the difficulties in the development of a prototype and direct measurements of micro-thrust and small flow *** address this issue,a Modular Ionic liquid Electrospray Thruster(MILET)prototype is constructed,and a diagnostic system for thrust and mass flow rate is specially developed based on an analytical balance *** the ionic liquid 1-ethyl-3-methylimidazolium tetrafluoroborate as the propellant,a series of experiments is carried out on the MILET prototype under a wide operating condition through changing the applied voltage to control the *** different applied voltages,the thrust and the mass flow rate of the propellant are directly *** propulsive performance parameters of the thruster,such as thrust,specific impulse,thrust-to-power ratio,thruster efficiency,etc.,are comprehensively ***,a performance comparison is made between the MILET and other representative *** a relatively low applied voltage ranging from 1550 V to 2000 V,the MILET achieves a quasi-constant specific impulse of 1263 s with the averaged thrust-to-power ratio of 65.2μN/W and thruster efficiency of 40.7%.The performance of ILET is also compared with other typical electric *** results demonstrate that the ILET exhibits an excellent ability of minimalization with high specific impulse and thruster efficiency,which guarantees a great superiority in micro ***,the ways to further improve the performance of ILET are discussed,which further confirms the potential prospect of *** present result helps to advance the development and application of ILET.

关键词： Electrospray thruster Ionic liquids Performance measurement Performance estimation Micro-propulsion

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含水泥岩卸荷蠕变数值模拟及劣化机制研究

岩石力学与工程学报 2024年第7期43卷 1621-1635页

作者：王宇夏厚磊邓华锋李建林三峡库区地质灾害教育部重点实验室湖北宜昌443002 三峡大学湖北长江三峡滑坡国家野外科学观测研究站湖北宜昌443002

为揭示含水泥岩卸荷蠕变破坏机制,开展不同含水率泥岩升轴压卸围压蠕变试验、细观结构测试及数值模拟分析。试验结果表明,含水率对泥岩蠕变变形影响显著,且同一蠕变应力水平下,轴向应变受含水率影响显著大于侧向。SEM图像分析表明,含水... 详细信息

为揭示含水泥岩卸荷蠕变破坏机制,开展不同含水率泥岩升轴压卸围压蠕变试验、细观结构测试及数值模拟分析。试验结果表明,含水率对泥岩蠕变变形影响显著,且同一蠕变应力水平下,轴向应变受含水率影响显著大于侧向。SEM图像分析表明,含水率增大导致泥岩内部孔隙度增大,矿物颗粒被溶解弱化,由致密程度好、强度高向强度低、疏松多孔不规则的堆积结构转化;并基于真实的泥岩细观结构特征,生成了统计学上等价的细观结构网络,建立了相应的GBM-PSC数值模型,并进行了验证。数值模拟计算结果发现,各类微裂纹数量均随含水率增大而增加,晶内张拉裂纹数量呈先增大后稳定再增大趋势,而晶间剪切裂纹数量则随含水率增大而持续增加;接触切向力角度偏转值及平均孔隙度均随卸荷蠕变时间增大呈先减小后稳定再增大趋势,且含水率越大,变化趋势越显著。最后,建立干燥及含水泥岩三阶段卸荷蠕变劣化演化模型。研究结果可为水作用下软岩工程开挖卸荷蠕变变形破坏机制研究提供一定的理论参考。

关键词：岩石力学含水泥岩卸荷蠕变细观结构网络 PFC2D数值模型劣化机制

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自动功能成像对无室壁运动异常患者冠状动脉狭窄的预测价值

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新乡医学院学报 2024年第3期41卷 266-269页

作者：郭惠衔李建玲刘烝昊李向京新乡市中心医院超声科二河南新乡453000

目的探讨自动功能成像(AFI)预测无室壁运动异常患者冠状动脉狭窄的价值。方法选择2018年7月至2019年9月新乡市中心医院收治的二维超声心动图检查无室壁运动异常且冠状动脉造影(CAG)证实冠状动脉狭窄≥70%的冠状动脉性心脏病患者40例为... 详细信息

目的探讨自动功能成像(AFI)预测无室壁运动异常患者冠状动脉狭窄的价值。方法选择2018年7月至2019年9月新乡市中心医院收治的二维超声心动图检查无室壁运动异常且冠状动脉造影(CAG)证实冠状动脉狭窄≥70%的冠状动脉性心脏病患者40例为研究对象,比较AFI与CAG对冠状动脉狭窄≥70%的检出率;以CAG为金标准,评估AFI对冠状动脉狭窄≥70%的预测价值。结果AFI和CAG对冠状动脉狭窄≥70%的检出率比较差异无统计学意义(χ^(2)=1.667,P>0.05)。AFI预测左冠状动脉前降支狭窄≥70%的敏感度为100.0%、特异度为63.6%、阳性预测值为69.2%、阴性预测值为100.0%、准确度为80.0%;预测左冠状动脉回旋支狭窄≥70%的敏感度为56.2%、特异度为91.6%、阳性预测值为81.8%、阴性预测值为75.8%、准确度为77.5%;预测右冠状动脉狭窄≥70%的敏感度为95.6%、特异度为47.0%、阳性预测值为70.9%、阴性预测值为88.0%、准确度为75.0%;预测冠状动脉狭窄≥70%的总体敏感度为85.9%、特异度为69.8%、阳性预测值为72.0%、阴性预测值为84.6%、准确度为77.5%。结论AFI可以为临床早期预测无室壁运动异常患者冠状动脉狭窄≥70%提供一个灵敏、客观、无创、廉价的检查方法。

关键词：冠状动脉狭窄自动功能成像无室壁运动异常

One-step electrochemical in-situ li doping and liF coating enable ultra-stable cathode for sodium ion batteries

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Journal of Energy Chemistry 2023年第7期82卷 228-238,I0005页

作者： Jiameng Feng Chaoliang Zheng De Fang jianling li State Key Laboratory of Advanced Metallurgy School of Metallurgical and Ecological EngineeringUniversity of Science and Technology BeijingBeijing 100083China

Despite of the higher energy density and inexpensive characteristics,commercialization of layered oxide cathodes for sodium ion batteries(SIBs)is limited due to the lack of structural stability at the high ***,the one-step electrochemical in-situ li doping and liF coating are successfully achieved to obtain an advanced Na0.79lix[li_(0.13)Ni_(0.20)Mn_(0.67)]O_(2)@liF(Nali-LNM@liF)cathode with superlattice *** results demonstrate that the li^(+)doped into the alkali metal layer by electrochemical cycling act as"pillars"in the form of li-li dimers to stabilize the layered *** supplementation of li to the superlattice structure inhibits the dissolution of transition metal ions and lattice ***,the in-situ liF coating restrains side reactions,reduces surface cracks,and greatly improves the cycling *** electrochemical in-situ modification strategy significantly enhances the electrochemical performance of the *** Nali-LNM@liF exhibits high reversible specific capacity(170.6 m A h g^(-1)at 0.05 C),outstanding capacity retention(92.65%after 200 cycles at 0.5 C)and excellent rate performance(80 mA h g^(-1)at 7 C)in a wide voltage range of 1.5-4.5 *** novel method of in-situ modification by electrochemical process will provide a guidance for the rational design of cathode materials for SIBs.

关键词： Sodium ion batteries Layered oxides In-situ li doping In-situ liF coating Superlattice structure

MOF-derived molybdenum selenide on Ti_(3)C_(2)T_(x) with superior capacitive performance for lithium-ion capacitors

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International Journal of Minerals,Metallurgy and Materials 2022年第5期29卷 1061-1072页

作者： Jianjian Zhong Lu Qin jianling li Zhe Yang Kai Yang Mingjie Zhang State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China State Key Laboratory of Operation and Control of Renewable Energy and Storage Systems China Electric Power Research InstituteBeijing 100192China

Two-dimensional Ti_(3)C_(2)T_(x) exhibits outstanding rate property and cycle performance in lithium-ion capacitors(liCs)due to its unique layered structure,excellent electronic conductivity,and high specific surface ***,like graphene,Ti_(3)C_(2)T_(x) restacks during electrochemical cycling due to hydrogen bonding or van der Waals forces,leading to a decrease in the specific surface area and an increase in the diffusion distance of electrolyte ions between the interlayer of the ***,a transition metal selenide MoSe_(2) with a special three-stacked atomic layered structure,derived from metal-organic framework(MOF),is introduced into the Ti_(3)C_(2)T_(x) structure through a solvo-thermal *** synergic effects of rapid li+diffusion and pillaring effect from the MoSe_(2) and excellent conductivity from the Ti_(3)C_(2)T_(x) sheets endow the material with excellent electrochemical reaction kinetics and *** composite Ti_(3)C_(2)T_(x)@MoSe_(2) material exhibits a high capacity over 300 mAh·g^(-1) at 150 mA·g^(-1) and excellent rate property with a specific capacity of 150 mAh·g^(-1) at 1500 mA·g^(-1).Addition-ally,the material shows a superior capacitive contribution of 86.0%at 2.0 mV·s^(-1) due to the fast electrochemical reactions.A Ti_(3)C_(2)T_(x)@MoSe_(2)//AC liC device is also fabricated and exhibits stable cycle performance.

关键词： two-dimensional titanium carbide molybdenum selenide solvothermal method electrochemical kinetics

Optimize two-phase distribution of lithium-rich materials to stabilize structure and suppress voltage attenuation

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International Journal of Minerals,Metallurgy and Materials 2022年第12期29卷 2201-2211页

作者： Yang Yu jianling li Guimei Han Zhe Yang Jianjian Zhong Feiyu Kang State Key Laboratory of Advanced Metallurgy School of Metallurgical and Ecological EngineeringUniversity of Science and Technology BeijingBeijing 100083China Chinese Research Academy of Environmental Sciences Beijing 100012China School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China

lithium-rich materials possess the ultra-high specific capacity,but the redox of oxygen is not completely reversible,resulting in voltage attenuation and structural instability.A stepwise co-precipitation method is used for the first time in this paper to achieve the control of the two-phase distribution through controlling the distribution of transition metal elements and realize the modification of particle surface structure without the aid of heterologous *** results of characterization tests show that the content of liMO_(2) phase inside the particles and the content of li_(2)MnO_(3) phase on the surface of the particles are successfully increased,and the surface induced formation of li_(4)Mn_(5)O_(12) spinel phase or some disorderly *** electrochemical performance of the modified sample is as follows:LR(pristine)shows specific discharge capacity of 72.7 mA·h·g^(−1)after 500 cycles at 1 C,while GR(modified sample)shows specific discharge capacity of 137.5 mA·h·g^(−1) at 1 C,and the discharge mid-voltage of GR still remains above 3 V when cycling to 220 cycles at 1 C(mid-voltage of LR remains above 3 V when cycling to 160 cycles at 1 C).Therefore,deliberately regulating the local state of the two phases is a successful way to reinforced the material structure and inhibition the voltage attenuation.

关键词： lithium-rich phase tuning engineering stepwise co-precipitation voltage attenuation 1.Introduction

Nonreciprocity of energy transfer in a nonlinear asymmetric oscillator system with various vibration states

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Applied Mathematics and Mechanics(English Edition) 2023年第5期44卷 727-744页

作者： Jian’en CHEN jianling li Minghui YAO Jun liU Jianhua ZHANG Min SUN Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical EngineeringTianjin University of TechnologyTianjin 300384China National Demonstration Center for Experimental Mechanical and Electrical Engineering Education Tianjin University of TechnologyTianjin 300384China School of Aeronautics and Astronautics Tiangong UniversityTianjin 300387China Agricultural Information Institute of Chinese Academy of Agricultural Sciences Key Laboratory of Agricultural Big DataMinistry of Agriculture and Rural AffairsBeijing 100081China School of Science Tianjin Chengjian UniversityTianjin 300384China

The nonreciprocity of energy transfer is constructed in a nonlinear asymmetric oscillator system that comprises two nonlinear oscillators with different parameters placed between two identical linear *** slow-flow equation of the system is derived by the complexification-averaging *** semi-analytical solutions to this equation are obtained by the least squares method,which are compared with the numerical solutions obtained by the Runge-Kutta *** distribution of the average energy in the system is studied under periodic and chaotic vibration states,and the energy transfer along two opposite directions is *** effect of the excitation amplitude on the nonreciprocity of the system producing the periodic responses is analyzed,where a three-stage energy transfer phenomenon is *** the first stage,the energy transfer along the two opposite directions is approximately equal,whereas in the second stage,the asymmetric energy transfer is *** energy transfer is also asymmetric in the third stage,but the direction is reversed compared with the second ***,the excitation amplitude for exciting the bifurcation also shows an asymmetric *** vibrations are generated around the resonant frequency,irrespective of which linear oscillator is *** excitation threshold of these chaotic vibrations is dependent on the linear oscillator that is being *** addition,the difference between the energy transfer in the two opposite directions is used to further analyze the nonreciprocity in the *** results show that the nonreciprocity significantly depends on the excitation frequency and the excitation amplitude.

关键词： nonreciprocity strong nonlinearity energy transfer chaotic vibration higher branch of response

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非线性能量阱最优参数的变化规律研究

天津理工大学学报 2024年第1期40卷 133-139页

作者：李建玲陈建恩孙敏刘小伟天津理工大学天津市先进机电系统设计与智能控制重点实验室天津300384 天津理工大学机电工程国家级实验教学示范中心天津300384 天津城建大学理学院天津300384

利用粒子群优化算法(particle swarm optimization,PSO)研究了单自由度和两自由度非线性能量阱(nonlinear energy sink,NES)的最优参数随冲击载荷的变化规律。在仅改变刚度和同时改变阻尼与刚度情况下对NES的最优吸振效能和最优参数进... 详细信息

利用粒子群优化算法(particle swarm optimization,PSO)研究了单自由度和两自由度非线性能量阱(nonlinear energy sink,NES)的最优参数随冲击载荷的变化规律。在仅改变刚度和同时改变阻尼与刚度情况下对NES的最优吸振效能和最优参数进行对比分析。结果表明,优化后的两自由度NES的吸振效能略优于单自由度NES。随着冲击载荷的增大,两种NES的最优刚度均逐渐减小,最优阻尼均逐渐增大。若考虑被动式装置,两自由度NES的吸振效能显然优于单自由度NES。若加入控制,使NES始终处于最优参数,两自由度NES的效能优势非常小,且其控制参数较多。

关键词：非线性能量阱(NES) 吸振效能最优参数粒子群优化算法(PSO)