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Walnut-inspired microsized porous silicon/graphene core-shell composites for high-performance lithium-ion battery anodes

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Nano Research 2017年第12期10卷 4274-4283页

作者： Wei Zhai Qing Ai Lina Chen Shiyuan Wei Deping Li Lin Zhang Pengchao Si Jinkui Feng Lijie Ci SDU & Rice Joint center for Carbon Nanomaterials Key Laboratory for Liquid-Solid Structural Evolution & Processing of Materials (Ministry of Education) School of Materials Science and Engineering Shondong University Jinan 250061 China

Silicon is considered an exceptionally promising alternative to the most commonly used material, graphite, as an anode for next-generation lithium-ion batteries, as it has high energy density owing to its high theoretical capacity and abundant storage. Here, microsized walnut-like porous silicon/reduced graphene oxide （P-Si/rGO） core-shell composites are successfully prepared via in situ reduction followed by a dealloying process. The composites show specific capacities of more than 2,100 mAh-g-1 at a current density of 1,000 mA-g-1, 1,600 mAh.g-1 at 2,000 mA-g-1, 1,500 mAh-g 1 at 3,000 mA-g-1, 1,200 mAh-g-1 at 4,000 mA.g-1, and 950 mAh.g~ at 5,000 mA.g-~, and maintain a value of 1,258 mAh.g-~ after 300 cycles at a current density of 1,000 mA-g 1. Their excellent rate performance and cycling stability can be attributed to the unique structural design： 1） The graphene shell dramatically improves the conductivity and stabilizes the solid- electrolyte interface layers; 2） the inner porous structure supplies sufficient space for silicon expansion; 3） the nanostructure of silicon can prevent the pulverization resulting from volume expansion stress. Notably, this in situ reduction method can be applied as a universal formula to coat graphene on almost all types of metals and alloys of various sizes, shapes, and compositions without adding any reagents to afford energy storage materials, graphene-based catalytic materials, graphene-enhanced composites, etc.

关键词： graphene silicon in situ reduction lithium-ion batteries

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Calculation of Electronic Structure of Anatase TiO_2 Doped with Transition Metal V,Cr,Fe and Cu Atoms by the Linearized Augmented Plane Wave Method

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Chinese Journal of structural Chemistry 2009年第7期28卷 869-873页

作者：廖斌覃礼钊吴先映侯兴刚程肯刘安东 Key Laboratory of Ministry of Education of China for Radiation Beam Technology and material Modification Institute of Low Energy Nuclear Physics Beijing Radiation Center Beijing Normal University Institute of Physics and Electronic Science Tianjin Normal University Department of material Science and Engineering Beijing Normal University

The electronic density of states and band structures of doped and un-doped anatase TiO2 were studied by the Linearized Augmented Plane Wave method based on the density functional theory. The calculation shows that the band structures of TiO2 crystals doped with transition metal atoms become narrower. Interesting, an excursion towards high energy level with increasing atomic number in the same element period could be observed after doping with transition metal atoms.

关键词： linearized augmented plane wave doped anatase Ti02 transition metal energy band

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structural and mechanical properties of amorphous carbon films deposited by the dual plasma technique

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Journal of University of Science and Technology Beijing 2008年第5期15卷 622-626页

作者： Yaohui Wang,Xu Zhang,Xianying Wu,Huixing Zhang,and Xiaoji Zhang Key Laboratory of the Ministry of Education of China for Beam Technology and material Modification,Institution of Low Energy Nuclear Physics,Beijing Normal University Beijing Radiation center,Beijing 100875,China Key Laboratory of the Ministry of Education of China for Beam Technology and material Modification Institution of Low Energy Nuclear Physics Beijing Normal University Beijing Radiation center Beijing 100875 China

Direct current metal filtered cathodic vacuum arc （FCVA） and acetylene gas （C2H2） were wielded to synthesize Ti-containing amorphous carbon films on Si （100）. The influence of substrate bias voltage and acetylene gas on the microstructure and mechanical properties of the films were investigated. The results show that the phase of TiC in the （111） preferential crystallographic orientation exists in the film,and the main existing pattern of carbon is sp2. With increasing the acetylene flow rate,the contents of Ti and TiC phase of the film gradually reduce; however,the thickness of the film increases. When the substrate bias voltage reaches -600 V,the internal stress of the film reaches 1.6 GPa. The micro-hardness and elastic modulus of the film can reach 33.9 and 237.6 GPa,respectively,and the friction coefficient of the film is 0.25.

关键词： metal containing amorphous carbon amorphous carbon films filtered arc acetylene flow rate bias voltage structure and properties

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Dynamic mechanical characteristics and application of constant resistance energy-absorbing supporting material

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International Journal of Mining Science and Technology 2022年第3期32卷 447-458页

作者： Qi Wang Shuo Xu Manchao He Bei Jiang Huayong Wei Yue Wang State Key Laboratory for Geo-mechanics and Deep Underground Engineering China University of Mining and Technology-BeijingBeijing 100083China Research center of Geotechnical and structural Engineering Shandong UniversityJinan 250061China

In deep underground engineering,rock burst and other dynamic disasters are prone to occur due to stress concentration and energy accumulation in surrounding *** control of dynamic disasters requires bolts and cables with high strength,high elongation,and high energy-absorbing ***,a constant resistance energy-absorbing(CREA)material is *** this study,the dynamic characteristics of the new material are obtained via the drop hammer tests and the Split Hopkinson Pressure Bar(SHPB)tests of the new material and two common bolt(CB)materials widely used in the *** test results of drop hammer test and SHPB test show that the percentage elongation of CREA material is more than 2.64 and 3.22 times those of the CB material,and the total impact energy acting on CREA material is more than 18.50 and 21.84 times,respectively,indicating that the new material has high elongation and high energy-absorbing ***,the CREA bolts and cables using the new material are developed,which are applied in roadways with high stress and strong dynamic *** field monitoring results show that CREA bolts and cables can effectively control the surrounding rock deformation and ensure engineering safety.

关键词： Constant resistance energy-absorbing Supporting material Dynamic impact tests Mechanical characteristics Field application

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Effect of boundary conditions on shakedown analysis of heterogeneous materials

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Applied Mathematics and Mechanics(English Edition) 2024年第1期45卷 39-68页

作者： Xiuchen GONG Yinghao NIE Gengdong CHENG Kai LI State Key Laboratory of structural Analysis Optimization and CAE Software for Industrial EquipmentInternational Research Center for Computational MechanicsDepartment of Engineering MechanicsDalian University of TechnologyDalian 116023Liaoning ProvinceChina

The determination of the ultimate load-bearing capacity of structures made of elastoplastic heterogeneous materials under varying loads is of great importance for engineering analysis and design. Therefore, it is necessary to accurately predict the shakedown domains of these materials. The static shakedown theorem, also known as Melan's theorem, is a fundamental method used to predict the shakedown domains of structures and materials. Within this method, a key aspect lies in the construction and application of an appropriate self-equilibrium stress field(SSF). In the structural shakedown analysis, the SSF is typically constructed by governing equations that satisfy no external force(NEF) boundary conditions. However, we discover that directly applying these governing equations is not suitable for the shakedown analysis of heterogeneous materials. Researchers must consider the requirements imposed by the Hill-Mandel condition for boundary conditions and the physical significance of representative volume elements(RVEs). This paper addresses this issue and demonstrates that the sizes of SSFs vary under different boundary conditions, such as uniform displacement boundary conditions(DBCs), uniform traction boundary conditions(TBCs), and periodic boundary conditions(PBCs). As a result, significant discrepancies arise in the predicted shakedown domain sizes of heterogeneous materials. Built on the demonstrated relationship between SSFs under different boundary conditions, this study explores the conservative relationships among different shakedown domains, and provides proof of the relationship between the elastic limit(EL) factors and the shakedown loading factors under the loading domain of two load vertices. By utilizing numerical examples, we highlight the conservatism present in certain results reported in the existing literature. Among the investigated boundary conditions, the obtained shakedown domain is the most conservative under ***, utilizing PBCs to

关键词： heterogeneous material self-equilibrium stress field(SSF) shakedown analysis effect of boundary conditions

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Effect of annealing on structural and optical properties of lead tungstate microcrystals

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Chinese Physics B 2011年第11期20卷 397-403页

作者：庞华锋李志杰向霞章春来傅永庆祖小涛 Department of Applied Physics University of Electronic Science and Technology of China International center for material Physics Chinese Academy of Sciences Thin Film Centre Scottish Union of Physics AllianceUniversity of the West of Scotland

Shuttle-like lead tungstate （PbWOa） microcrystals are synthesized at room temperature using the precipitation method with the cetyltrimethyl ammonium bromide. Results from both the X-ray diffraction and the scanning electron microscopy show that the lattice distortions of the PbWO4 microcrystals are reduced significantly when the annealing temperature is increased to 873 K. The result from the ultraviolet-visible diffuse reflectance spectroscopy shows that the exciton absorption appears in the sample annealed at 673 K. The self-trapped exciton luminescence due to the Jahn- Teller effect is also observed in the blue band. The interstitial oxygen ions in the WO42- groups are mainly resposible for the enhancement effect of the green luminescence of the annealed samples. The above results are supported by the spectrum analysis of the as-grown and the post-annealed samples using the X-ray photoelectron spectroscopy.

关键词： PbWO4 microcrystal annealing defects photoluminescence

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High-pressure electrides: From design to synthesis

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Chinese Physics B 2019年第10期28卷 50-55页

作者： Biao Wan Jingwu Zhang Lailei Wu Huiyang Gou Key Laboratory of Metastable materials Science and Technology College of Material Science and EngineeringYanshan UniversityQinhuangdao 066004China center for High Pressure Science and Technology Advanced Research Beijing 100094China

Electrides are unique ionic compounds that electrons serve as the anions. Many electrides with fascinating physical and chemical properties have been discovered at ambient condition. Under pressure, electrides are also revealed to be ubiquitous crystal morphology, enriching the geometrical topologies and electronic properties of electrides. In this Review,we overview the formation mechanism of high-pressure electrides(HPEs) and outline a scheme for exploring new HPEs from pre-design, CALYPSO assisted structural searches, indicators for electrides, to experimental synthesis. Moreover, the evolution of electronic dimensionality under compression is also discussed to better understand the dimensional distribution of anionic electrons in HPEs.

关键词： electrides high pressure CALYPSO structural search

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A study of the initial adhesive force of cells on silk fibroin-based materials using micropipette aspiration

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Regenerative Biomaterials 2018年第3期5卷 151-157页

作者： Xiaojie Lian Shichao Liu Liming Liu Rui Xu Miaomiao Du Song Wang Hesun Zhu Qiang Lu Quanyou Zhang Yali Wu Di Huang Yan Wei Department of Biomedical Engineering Research Center for Nano-Biomaterials and Regenerative MedicineCollege of MechanicsTaiyuan University of TechnologyTaiyuan 030024China Shanxi Key Laboratory of material Strength and structural Impact Institute of Applied Mechanics and Biomedical EngineeringTaiyuan University of TechnologyTaiyuan 030024China Research center of materials Science School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China National Engineering Laboratory for Modern Silk College of Textile and Clothing EngineeringSoochow UniversitySuzhou 215123China

With the development of biomaterials,more attention is paid to the adhesion characteristics between cells and *** is necessary to study the adhesive force with a suitable *** fibroin(SF)is widely investigated in biomedical application due to its novel biocompatibility and mechanical *** this article,the micropipette aspiration method and measurement pattern of uniform cells in round shape(UCR)was used to study the initial adhesive force of three types of cells on pure silk fibroin films(SFFs).We also compared the adhesive forces of modified SFFs with that of pure *** results of adhesive force in the initial adhesive stage were in concordance with the results of MTT assay andmicroscope observation,which were confirmed by the above three cell lines and four kinds of *** results indicated UCR was an efficient and quantitative measurement pattern in initial adhesion *** article also provides a useful method in identifying initial cell-materials interactions.

关键词： silk-based materials cell initial adhesion micropipette uniform cells in round shape

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Micro-scaled plastic yielding and shear-banding dynamics in metallic glasses

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Journal of materials Science & Technology 2023年第21期152卷 237-246页

作者： D.X.Han G.Wang Q.Wang R.Feng X.D.Ma K.C.Chan C.T.Liu Institute of materials Shanghai UniversityShanghai 200444China Department of Industrial and Systems Engineering The Hong Kong Polytechnic UniversityHong KongChina Neutron Scattering Division Oak Ridge National LaboratoryOak RidgeTN 37831United States Department of material Science and Engineering College of Science and EngineeringCity University of Hong KongHong KongChina center for Advanced structural materials College of Science and EngineeringCity University of Hong KongHong KongChina

Shear-banding behavior in metallic glasses plays a key role in the operation of plastic deformation,which is associated with yield *** a micro-scale,the shear-banding behavior must be affected by many factors from the test machine and the ***,in this study,comprehensively considering a machine compliance,a geometry imperfection of micro-pillar,and a substrate sink-in the machine-sample-substrate system,we developed a plastic-strength model at a micrometer scale in this study,which is evidenced by the microscale compressive properties of 18 kinds of metallic *** the-oretical model provides a guidance for the elastic limits and shear-banding dynamics of metallic glasses at the micro-scale,which can be applicable to characterize the microscale deformation behavior of other amorphous materials.

关键词： Metallic glasses Shear-banding dynamics Micro-compression Plastic deformation

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structural Relaxation of Pd_(39)Ni_(10)Cu_(30)P_(21) Bulk Metallic Glass Under High Pressure

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Chinese Physics Letters 2001年第4期18卷 567-569页

作者： WANG Li-Min ZHAN Zai-Ji SUN Li-Ling LI Gong WANG Wen-Kui center for Condensed Matter Physics Chinese Academy of SciencesBeijing 100080 College of material Sciences and Chemical Engineering Yanshan UniversityQinhuangdao 066004

The Pd_(39)Ni_(10)Cu_(30)P_(21) bulk metallic glass is isothermally relaxed under various *** degree of the structural relaxation is evaluated in terms of the enthalpy recovery behaviours involved in the irreversible glass transition processes by using a temperature-modulated differential scanning calarimetry technique.A roughly linear increase of the recovery enthalpy is observed within the experimental pressure range from 2.67 to 4.45 GPa,which reflects the release of the frozen-in enthalpy in the as-quenched glass with increasing relaxation *** pressure dependence of the time scale of the enthalpy recovery processes is also exhibited.

关键词： technique. enthalpy relaxation

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