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Special focus on two-dimensional materials and device applications

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Science China(Information Sciences) 2019年第12期62卷 53-54页

作者： xinran wang Peng ZHOU Nanjing University Fudan University

The exploration of two dimensional layered materials (2DLMs) with atomic thickness and rich bandstructures has taken both the scientific and technological communities by storm during the past one and a half decade. Gr... 详细信息

关键词： Special focus on two-dimensional materials and device applications

Micro Morphology of Soot Particles Sampled from High Pressure Jet Flames of Diesel from Direct Coal Liquefaction

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Journal of Thermal Science 2022年第6期31卷 2155-2170页

作者： wang Tengfei QIAO Xinqi LI Tie WU Gang wang xinran Key Laboratory of Power Machinery and Engineering Ministry of EducationShanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Ocean Engineering Shanghai Jiao Tong UniversityShanghai 200240China Merchant Marine College Shanghai Maritime UniversityShanghai 201306China

Diesel from direct coal liquefaction(DDCL) is a new type of engine alternative energy. But its hydrocarbon composition and physicochemical properties are quite different from those of Petro diesel. In this study, a premixed constant volume combustion chamber(CVCC) system with soot particle sampling devices was built. The soot particles in the spray flame were sampled and photographed by thermophoresis probe and transmission electron microscope(TEM). An automatic processing code based on Matlab software was developed to process the TEM images and extract the micro morphology parameters of the soot particles. This study has systematically studied the effects of sampling location, injection pressure, ambient density and oxygen concentration on the micro morphology of soot particles. The ambient density refers to the initial gas density in the CVCC. The results showed that various morphologies and sizes of soot particles coexisted in the upstream of the spray flame. During the evolution of soot particles from upstream to downstream in the flame, the size of soot aggregates gradually decreased, while the maturity of soot aggregates increased. With the increase of injection pressure, ambient density and oxygen concentration, the average sizes of soot aggregates and primary soot particles decreased, but the fractal dimensions of soot aggregates increased gradually. Under the same combustion condition and in-flame sampling location, the average projection area, gyration radius and primary soot diameter of soot aggregates produced by DDCL were significantly lower than those of Petro diesel. The structure of soot particles from DDCL was more compact than that of Petro diesel.

关键词： diesel from direct coal liquefaction in-flame sampling soot morphology TEM

High-Voltage Layered Ternary Oxide Cathode Materials:Failure Mechanisms and Modification Methods

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Chinese Journal of Chemistry 2020年第12期38卷 1847-1869页

作者： Xiaodan wang Ying Bai xinran wang Chuan Wu Beijing Key Laboratory of Environmental Science and Engineering School of Materials Science&EngineeringBeijing Institute of TechnologyNo.5 South Zhongguancun StreetBeijing 100081China Collaborative Innovation Center of Electric Vehicles in Beijing Beijing 100081China

Due to the large reversible capacity,high operating voltage and low cost,layered ternaryoxide cathode materials LiNixCoyAl-x-yO2(NCA)and LiNixCoyMn1-x-yO2(NCM)are considered asthe most potential candidate materials for lithium-ion batteries(LIBs)used in(hybrid)electricvehicles(EVs).However,next-generation long-range EVs require a high specific capacity(around 203 mAh·g^-1at 3.7V)at the cathode active material level,which is not provided withcurrent commercially layered ternary oxide *** the operating voltage is aneffective method to improve the specific capacity of the cathode and the energy density of the battery,but the high operating voltage also causes a lot of problems,such as cation mix-ing and phase transformation,electrolyte decomposition,transition metal dissolution *** far,researchers have carried out a lot of works to solve these ***,element doping and the design of electrolytes have been proved to be effective *** this review,the failure mechanisms and modification methods of high-voltage lay-ered ternary oxide cathode materials are summarized,which could provide valuable infor-mation to the research of high-voltage layered ternary oxide cathode materials in basic sci-ence and industrial production.

关键词： coating Ternary battery

Charactering and optimizing cathode electrolytes interface for advanced rechargeable batteries:Promises and challenges

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Green Energy & Environment 2022年第4期7卷 606-635页

作者： Zhongyang Zhang xinran wang Ying Bai Chuan Wu Beijing Key Laboratory of Environmental Science and Engineering School of Materials Science&EngineeringBeijing Institute of TechnologyBeijingChina Yangtze Delta Region Academy of Beijing Institute of Technology Jiaxing314019China

With the advancement of secondary batteries,interfacial properties of electrode materials have been recognized as essential factors to their electrochemical ***,the majority of investigations are devoted into advanced electrode materials synthesis,while there is insufficient attention paid to regulate their *** this regard,the solid electrolyte interphase(SEI)at anode part has been studied for 40 years,already achieving remarkable outcomes on improving the stability of anode ***,the study on the cathode electrolyte interfaces(CEI)remains in infancy,which constitutes a potential restriction to the capacity contribution,stability and safety of *** fact,the native CEI generally possesses unfavorable characteristics against structural and compositional stability that requires demanding optimization ***,an in-depth understanding of the CEI is of great significance to guide the optimization principles in terms of composition,structure,growth mechanism,and electrochemical *** this literature,recent progress and advances of the CEI characterization methods and optimization protocols are summarized,and meanwhile the mutually-reinforced mechanisms between detection and modification are *** criteria and the potential development of the CEI characterization are proposed with insights of novel optimization directions.

关键词： Cathode electrolyte interface Secondary battery Characterization methods In situ/operando Synchrotron radiation

Numerical simulation of the influence of aerosol radiation effect on urban boundary layer

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Science China Earth Sciences 2018年第12期61卷 1844-1858页

作者： xinran wang Xiaodong HE Shiguang MIAO Youjun DOU China Institute of Atomic Energy Beo'ing 102413China Institute of Urban Meteorology China Meteorological AdministrationBeijing 100089China

With the intensification of pollution and urbanization, the aerosol radiation effect continues to play an important role in the urban boundary layer. In this paper, a winter pollution process in Beijing has been taken as an example, and a new aerosol vertical profile in the radiative parameterization scheme within the Weather Forecast Research and Forecasting(WRF) model has been updated to study the effect of aerosols on radiation and the boundary layer. Furthermore, the interactions among aerosols,urbanization, and planetary boundary layer(PBL) meteorology were discussed through a series of numerical experiments. The results show the following:(1) The optimization improves the performance of the model in simulating the distribution features of air temperature, humidity, and wind in Beijing.(2) The aerosols reduce the surface temperature by reducing solar radiation and increasing the temperature in the upper layer by absorbing or backscattering solar radiation. The changes in the PBL temperature lead to more stable atmospheric stratification, reducing the energy transfer from the surface and the height of the boundary layer.(3) With the increase in the aerosol optical depth, the atmospheric stratification most likely becomes stable over rural areas, most likely becomes stable over suburb areas, and has great difficultly becoming stable over urban areas. Aerosol radiative forcing,underlying urban surfaces, and the interaction between them are the main factors that affect the changes in the meteorological elements in the PBL.

关键词： Aerosol Urbanization Boundary layer Meteorological elements WRF

Chemical Self-Assembly of Graphene Sheets

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Nano Research 2009年第4期2卷 336-342页

作者： Hailiang wang xinran wang Xiaolin Li Hongjie Dai Department of Chemistry and Laboratory for Advanced Materials Stanford UniversityStanfordCA 94305USA

Chemically derived and noncovalently functionalized graphene sheets(GS)were found to self-assemble onto patterned gold structures via electrostatic interactions between the functional groups and the gold *** afforded regular arrays of single graphene sheets on large substrates,which were characterized by scanning electron microscopy(SEM),Auger microscopy imaging,and Raman *** represents the fi rst time that self-assembly has been used to produce on-substrate and fully-suspended graphene electrical *** coatings on the GS were removed by high current“electrical annealing”,which restored the high electrical conductance and Dirac point of the *** sensors for highly sensitive gas detection using the self-assembled GS devices are demonstrated.

关键词： Chemically derived graphene sheets self-assembly graphene devices electrical annealing

Multivalent metal-sulfur batteries for green and cost-effective energy storage:Current status and challenges

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Journal of Energy Chemistry 2022年第1期31卷 144-165,I0005页

作者： Yue Yang Haoyi Yang xinran wang Ying Bai Chuan Wu Beijing Key Laboratory of Environmental Science and Engineering School of Materials Science&EngineeringBeijing Institute of TechnologyBeijing 100081China Collaborative Innovation Center of Electric Vehicles in Beijing Beijing 100081China

Multivalent metal-sulfur(M-S,where M=Mg,Al,Ca,Zn,Fe,etc.)batteries offer unique opportunities to achieve high specific capacity,elemental abundancy and cost-effectiveness beyond lithium-ion batteries(LIBs).However,the slow diffusion of multivalent-metal ions and the shuttle of soluble polysulfide result in impoverished reversible capacity and limited cycle performance of M-S(Mg-S,Al-S,Ca-S,Zn-S,Fe-S,etc.)*** is a necessity to optimize the electrochemical performance,while deepening the understanding of the unique electrochemical reaction mechanism,such as the intrinsic multi-electron reaction process,polysulfides dissoluti on and the in stability of metal an *** solve these problems,we have summarized the state-of-the-art progress of current M-S batteries,and sorted out the existing challen ges for different multivalent M-S batteries according to sulfur cathode,electrolytes,metallic an ode and current collectors/separators,*** this literature,we have surveyed and exemplified the strategies developed for better M-S batteries to strengthen the application of green,cost-effective and high energy density M-S batteries.

关键词： Multivale nt metal-sulfur batteries Cost-effectiveness Green energy storage Shuttle effect Electrolyte

Sulfone-based high-voltage electrolytes for high energy density rechargeable lithium batteries:Progress and perspective

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Chinese Chemical Letters 2021年第4期32卷 1309-1315页

作者： Wenya Wu Ying Bai xinran wang Chuan Wu Beijing Key Laboratory of Environmental Science and Engineering School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China

Further enhancement in the energy density of rechargeable lithium batteries calls for high-voltage cathode materials and stable anodes,as well as matched high-voltage electrolytes without compromising the overall property of ***-based electrolytes have aroused great interest in recent years owing to their wide electrochemical window and high ***,significant challenges such as the complexity of synthesis,high melting point(typically above room temperature),high viscosity,and their poor compatibility with graphite-based anodes have drastically impeded their practical *** this review,recent progress of sulfone solvents in high energy density rechargeable lithium batteries is summarized theoretically and *** importantly,general improvement methods of sulfone-based electrolytes,such as adding additives and cosolvents,structural modifications of sulfo ne,superconcentrated salt strategy are briefly *** expect that this review provides inspiration for the future developments of sulfone-based high-voltage electrolytes(SHVEs)and their widespread applications in high specific energy lithium batteries.

关键词： Lithium batteries High voltage High energy density Sulfone-based electrolytes Optimizations

Insight to defects regulation on sugarcane waste-derived hard carbon anode for sodium-ion batteries

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Journal of Energy Chemistry 2021年第4期30卷 499-508页

作者： Kaihua Yu xinran wang Haoyi Yang Ying Bai Chuan Wu Beijing Key Laboratory of Environmental Science and Engineering School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Collaborative Innovation Center of Electric Vehicles in Beijing Beijing 100081China

A great deal of attention has been paid on developing plant-derived hard carbon(HC)materials as anodes for sodium-ion batteries(SIBs).So far,the regulation of HC has been handicapped by the well-known ambiguity of Na^(+)storage mechanism,which fails to differentiate the Na^(+)adsorption and Na^(+)insertion,and their relationship with the size of d-interlayer spacing and structural ***,bagassederived HC materials have been synthesized through a combination of pyrolysis treatment and microwave *** combined protocol has enabled to synergistically control the d-interlayer spacing and ***,the microwave activation has created slit pores into HC and these pores allow for an enhanced Na^(+)adsorption with an increased sloping capacity,establishing a strong correlation between the porosity and sloping ***,the pyrolysis treatment promotes the graphitization and it contributes to an intensified Na^(+)insertion with an increased plateau capacity,proving that the plateau capacity is largely contributed by the Na^(+)insertion between ***,the structural regulation of bagasse-derived HC has provided a proof on positively explaining the Na^(+)storage with HC *** structural changes in the pore size distribution,specific surface area,d-interlayer spacing,and the electrochemical properties have been comprehensively characterized,all supporting our understanding of Na^(+)storage *** a result,the HC sample with an optimized d-interlayer spacing and porosity has delivered an improved reversible capacity of 323.6 m Ah g^(-1) at 50 m A g^(-1).This work provides an understanding of Na^(+)storage mechanism and insights on enhancing the sloping/plateau capacity by rationally regulating the graphitization and porosity of HC materials for advanced SIBs.

关键词： Hard carbon Sodium-ion batteries Microwave activation Sodium storage mechanism