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Suppressed Internal Intrinsic Stress Engineering in High-Performance Ni-Rich Cathode Via Multi layered In Situ Coating Structure

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Energy & Environmental Materials 2024年第2期7卷 58-66页

作者： Jiachao Yang Yunjiao Li xiaoming Xi Junchao zheng Jian Yu Zhenjiang He School of Metallurgy and Environment Central South UniversityChangsha 410083China Engineering Research Center of the Ministry of Education for Advanced Battery Materials Central South UniversityChangsha 410083China Changsha Research Institute of Mining and Metallurgy Changsha 410083China Ningbo Ronbay New Energy Technol Co Ltd Tanjialing East Rd 39Ningbo 315400China

LiNi_(x)Co_(y)Al_(z)O_(2)(NCA)cathode materials are drawing widespread attention,but the huge gap between the ideal and present cyclic stability still hinders their further commercial application,especially for the Ni-rich LiNi_(x)Co_(y)Al_(z)O_(2)(x>0.8,x+y+z=1)cathode material,which is owing to the structural degradation and particles'intrinsic *** tackle the problems,Li_(0.5)La_(2)Al_(0.5)O_(4)in situ coated and Mn compensating doped multilayer LiNi_(0.82)Co_(0.14)Al_(0.04)O_(2)was *** refinement indicates that La-Mn co-modifying could realize appropriate Li/Ni disorder *** results and in situ XRD patterns reveal that the LLAO coating layer could effectively restrain crack in secondary particles benefited from the suppressed internal *** further improves as NCA-LM2 has superior mechanical *** SEM,TEM,XPS tests indicate that the cycled cathode with LLAO-Mn modification displays a more complete morphology and less side reaction with *** was used to further investigate cathode-electrolyte interface which was reflected by gas ***-LM2 releases less CO_(2)than NCA-P indexing on a more stable *** modified material presents outstanding capacity retention of 96.2%after 100 cycles in the voltage range of 3.0-4.4 V at 1C,13%higher than that of the pristine and 80.8%at 1 C after 300 *** excellent electrochemical performance could be attributed to the fact that the high chemically stable coating layer of Li_(0.5)La_(2)Al_(0.5)O_(4)(LLAO)could enhance the interface and the Mn doping layer could suppress the influence of the lattice mismatch and *** believe that it can be a useful strategy for the modification of Ni-rich cathode material and other advanced functional material.

关键词： compensating doped in situ coating multilayer material Ni-rich cathode materials suppressed internal strain

Enormous enhancement in electrical performance of few-layered MoTe2 due to Schottky barrier reduction induced by ultraviolet ozone treatment

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Nano Research 2020年第4期13卷 952-958页

作者： xiaoming zheng Xueao Zhang Yuehua Wei Jinxin Liu Hang Yang Xiangzhe Zhang Shitan Wang Haipeng Xie Chuyun Deng Yongli Gao Han Huang Hunan Key Laboratory of Super-microstructure and Ultrafast Process School of Physics and ElectronicsCentral South UniversityChangsha 410083China College of Arts and Science National University of Defense TechnologyChangsha 410073China College of Physical Science and Technology Xiamen UniversityXiamen 361005China Department of Physics and Astronomy University of RochesterRochesterNY 14627USA

Doping can improve the band alignment at the metal-semiconductor interface to modify the corresponding Schottky barrier,which is crucial for the realization of high-performance logic ***,we systematically investigated a convenient and effective method,ultraviolet ozone treatment,for p-type doping of MoTe2 field-effect transistors to enormously enhance the corresponding electrical *** resulted hole concentration and mobility are near 100 times enhanced to be〜1.0×10^13 cm^-2 and 101.4 cm^2/(V·s),respectively,and the conductivity is improved by 5 orders of *** values are comparable to the highest ones ever obtained via annealing doping or non-lithographic fabrication methods at room *** with the pristine one,the photoresponsivity(522 mA/W)is enhanced approximately 100 *** excellent performances can be attributed to the sharply reduced Schottky barrier because of the surface charge transfer from MoTe2 to MoOx(x<3),as proved by photoemission ***,the p-doped devices exhibit excellent stability in ambient *** findings show significant potential in future nanoelectronic and optoelectronic applications.

关键词： MoTe2 ultraviolet ozone surface charge transfer Schottky barrier air stable hole doping

Investigation of surface textures deterioration on pavement skid-resistance using hysteresis friction models and numerical simulation method

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Friction 2024年第4期12卷 745-779页

作者： Haoyuan LUO Siyu CHEN Leyi ZHU Xiyin LIU Yangzezhi zheng Runming ZHAO xiaoming HUANG School of Transportation Southeast UniversityNanjing 211189China National Demonstration Center for Experimental Education of Road and Traffic Engineering Southeast UniversityNanjing 211189China

Many rubber friction theories or some method combined theories and field-experiments are employed to evaluate the pavement skid-resistance deterioration due to the evolution of surface ***,these methods are difficult to be implemented in the analysis of situations with multi-factor coupling and some extreme *** study developed a framework to evaluate the skid-resistance deterioration of asphalt *** this framework,the portable laser scanning was used to create the digital worn pavement model,and a hydroplaning finite element(FE)model for these digital worn pavements was constructed to evaluate coupling effects of the texture evolution and factors of slip ratio,slip angle,velocity and water film on braking-cornering characteristics of *** this study,the deterioration of skid-resistance of five typical asphalt pavements due the surface texture wear was systematically investigated by this *** with previous works,this study established the rubber friction models for each digital worn pavement considering the energy hysteresis of rubber and the power spectrum density of surface *** the rubber friction model was used to define the interaction behaviors between the tire and corresponding wore pavements in the FE hydroplaning model,rather than using an empirical friction model or a fixed friction coefficient.

关键词： worn pavement skid-resistance friction coefficient textures evolution water film computer numerical simulation

Studies on Kinetic Properties of Active Oxygen on the Surfaces of V_2O_5/SiO_2, V_2O_5-MoO_3/SiO_2 and V_2O5-P_2O5/SiO_2 Catalysts

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Chemical Research in Chinese Universities 1989年第4期5卷 304-312页

作者： zheng xiaoming, Zhu Yifei and Zhou Lihua (Department of Chemistry, Hangzhou University, Hangzhou)

Applying the TPD-MS with a high sensitivity of determination, the TPD spectrum of surface oxygen of V2O5/SiO2, V2O5-MoO3/SiO2 and V2O6-P2O5/SiO2 catalysts was obtained. The surface oxygen of these catalysts can be divided into three groups according to the desorption temperature. O2- desorbs mainly from 373K. to 423K, O- from 673K to 873K and O2- at above 873K. The activation energy and frequency factor of all the three kinds of oxygen species were calculated. Based on these results, the mechanism of oxygen desorption and the influence of P2O5 and MoO3 on the properties of oxygen supply of V2O5/SiO2 catalst were investigated. MoO3 and a small amount of P2Os increase the number of supplying oxygen and increase the activity of O- species. A large amount of P2O5 increases the number of supplying oxygen and restrains the activity of O- species.

关键词： Catalyst Vanadium pentoxide Oxygen

Highly in-plane anisotropy of thermal transport in suspended ternary chalcogenide Ta_(2)NiS_(5)

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Nano Research 2022年第7期15卷 6601-6606页

作者： Yue Su Chuyun Deng Jinxin Liu xiaoming zheng Yuehua Wei Yangbo Chen Wei Yu Xiao Guo Weiwei Cai Gang Peng Han Huang Xueao Zhang College of Physical Science and Technology Xiamen UniversityXiamen 361005China College of Arts and Sciences National University of Defense TechnologyChangsha 410073China College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangsha 410073China Jiujiang Research Institute of Xiamen University Jiujiang 332105China Hunan Key Laboratory of Super-microstructure and Ultrafast Process School of Physics and ElectronicsCentral South UniversityChangsha 410083China Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing 100190China

Energy dissipation has always been an attention-getting issue in modern electronics and the emerging low-symmetry two-dimensional(2D)materials are considered to have broad prospects in solving the energy dissipation *** the thermal transport of a typical 2D ternary chalcogenide Ta_(2)NiS_(5) is *** the first time we have observed strongly anisotropic in-plane thermal conductivity towards armchair and zigzag axes of suspended few-layer Ta_(2)NiS_(5) flakes through Raman *** 7-nm-thick Ta_(2)NiS_(5) flakes,theκz i g z a g is 4.76 W·m^(−1)·K^(−1) andκa r m c h a i r is 7.79 W·m^(−1)·K^(−1),with a large anisotropic ratio(κa r m c h a i r/κz i g z a g)of 1.64 mainly ascribed to different phonon mean-free-paths along armchair and zigzag ***,the thickness dependence of thermal anisotropy is also *** the flake thickness increases,theκa r m c h a i r/κz i g z a g reduces sharply from 1.64 to *** could be attributed to the diversity in phonon boundary scattering,which decreases faster in zigzag direction than in armchair *** anisotropic property enables heat flow manipulation in Ta_(2)NiS_(5) based devices to improve thermal management and device *** work helps reveal the anisotropy physics of ternary transition metal chalcogenides,along with significant guidance to develop energy-efficient next generation nanodevices.

关键词： anisotropic thermal conductivity ternary transition metal chalcogenide Ta_(2)NiS_(5) energy dissipation phonon mode

Performance of Co/MgO catalyst for CO_2 reforming of toluene as a model compound of tar derived from biomass gasification

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Journal of Energy Chemistry 2014年第6期23卷 795-800页

作者： Xiuxiu Bao Meng Kong Wen Lu Jinhua Fei xiaoming zheng Institute of Catalysis Key Lab of Applied Chemistry of Zhejiang Province Zhejiang University

Catalytic performances of the CO2 reforming of toluene on Co/MgO catalysts with different cobalt loadings were evaluated in a fluidized-bed reactor. The results showed that the conversion of toluene and the stability of Co/MgO increased, but the apparent reaction rate decreased at the initial stage with increasing the amount of metallic Co formed from the reduction of Co/MgO catalysts at 700 ~C. The deactivation of Co/MgO catalysts was mainly resulted from that a part of the metallic Co was oxidized by CO2 and could not be re-reduced by H2 at reaction temperature. Therefore, the excess metallic Co on the higher Co loading catalysts was beneficial to the catalyst stability.

关键词： cobalt catalyst magnesia carbon dioxide reforming toluene biomass tar

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二次设备端子排可靠连接检测技术研究

电力与能源 2024年第2期45卷 260-262,280页

作者：刘晗吴雪峰张伟潘仲达刘洁波郑晓明国网浙江省电力有限公司金华供电公司浙江金华321000

电气二次设备端子排接触不良会导致不可靠连接,进而导致保护设备不正确动作等异常情况,目前还没有很好的解决措施,对此提出了一种专门针对二次设备端子排接触不良异常的检测方法,力求用更高效的方法检测端子排接触不良缺陷。

关键词：端子排可靠连接接触不良检测隐患

A Novel Catalyst Supported on Stainless Steel Pretreated by Anodic Oxidation for Control of Volatile Organic Compound Emissions

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催化学报 2003年第11期24卷 807-808页

作者： LI Huiqing, CHEN Min, zheng xiaoming (Institute of Catalysis, Zhejiang University, Hangzhou 310028, Zhejiang, China) Institute of Catalysis Zhejiang University 浙江 Hangzhou 310028

Catalytic oxidation is an energy efficient and economical way to get rid of volatile organic compound (VOC) emissions. Sungkono et al have developed a new type of catalyst for VOC treatment, which consists of catalytic substances dispersed on a porous alumina film, and the total oxidation of toluene was obtained at 350 ℃. Stainless steel has many applications in indsutry for its high anti-corrosion properties and compact oxide coating after anodizing. However, there is little relevant information published on VOC treatment. In this paper, we report a novel noble metal catalyst supported on stainless steel treated by anodic oxidation for VOC removal. The catalyst showed excellent activity for toluene combustion at the low temperature of 210 ℃ even after calcination at 1 000 ℃.

关键词：催化剂不锈钢预处理阳极氧化挥发性有机化合物铂钯腐蚀防治

Dual-negative-objective Coordinated Control of Brushless Doubly Fed Induction Generator under Unbalanced Grid Voltage

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CES Transactions on Electrical Machines and Systems 2024年第3期8卷 347-355页

作者： Ming Cheng zheng Cao xiaoming Yan School of Electrical Engineering Southeast UniversityNanjing 210096China School of Electrical and Automation Engineering Nanjing Normal University Nanjing 210023China

This article proposes a dual-negative-objective coordinated control strategy for brushless doubly fed induction generator(BDFIG)based wind power generation system under unbalanced grid *** alleviate the mechanical stress and impaction on rotating shaft,the negative control objective(NCO)of machine side converter(MSC)is set to suppress the ripple of electromagnetic *** the NCO of grid side converter(GSC)is selected to suppress the oscillation of total output active power or the unbalanced degree of total output current for BDFIG generation *** comparison with traditional single converter control scheme of the MSC or GSC,dual NCOs can be satisfied at the same time due to the enlarged freedom degree in the proposed improved coordinated control system for back-toback *** effectiveness of proposed control strategy is validated by simulation and experimental results on a dual-cagerotor BDFIG(DCR-BDFIG)prototype.

关键词： Brushless doubly fed induction generator Dual-negative-objective Freedom degree Unbalanced grid voltage