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Design of phase interface and defect in niobium-nickel oxide for ultrafast Li-ion storage

Journal of Materials Science & Technology 2023年第16期147卷 145-152页

作者： Haiting Chen Haoyan Cheng Hangchen Liu Yibo Hu Tongtong Yuan Shuge Dai Meilin Liu Hao Hu Collaborative Innovation Center of Nonferrous Metals School of Materials Science and EngineeringHenan University of Science and TechnologyLuoyang 471023China Key Laboratory of Material Physics of Ministry of Education School of Physics and EngineeringZhengzhou UniversityZhengzhou 450052China School of Materials Science and Engineering Georgia Institute of TechnologyAtlantaGA30332-0245United States of America

Niobium pentoxide(Nb2O5)has attracted much attention in lithium batteries due to its advantages of high operating voltage,large theoretical capacity,environmental friendliness and ***,the intrinsic poor electrical conductivity,sluggish kinetics,and large volume changes hinder its electrochemical performance at high power density,making it away from the requirements for practical *** this research work,we regulate the electron transport of niobium-nickel oxide(NiNbO)anode material with enhanced structural stability at high power density by constructing the two-phase boundaries between niobium pentoxide(Nb2O5)and nickel niobate(NiNb2O6)through simple solid phase *** addition,the presence of lattice defects in NiNbO-F further speeds up the transport of Li+and promotes the electrochemical reaction kinetics more *** two-phase boundaries and defect modulated anode material displays high Li+diffusion coefficient of 1.63×10^(−10) cm^(2) s^(−1),pretty high initial discharge capacity of 222.8 mAh g^(−1) at 1 C,extraordinary high rate performance(66.7 mAh g^(−1))at an ultrahigh rate(100 C)and ultra-long cycling stability under high rate of 25 C(83.4 mAh g^(−1) after 2000 cycles)with only 0.016%attenuation per *** results demonstrate an effective approach for developing electrode materials that greatly improve rate performance and durability.

关键词： Niobium oxide phase interface Defects Rate performance Lithium-ion batteries

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Superior multiphase interfaces in AgCuTe-based composite with significantly enhanced thermoelectric properties

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Journal of Advanced Ceramics 2023年第8期12卷 1511-1520页

作者： Wenpei Li Zhonghai Yu Chengyan Liu Ying Peng Baoquan Feng Jie Gao Guojing Wu Xiaobo Bai Junliang Chen Xiaoyang Wang Lei Miao Guangxi Key Laboratory of Information Materials Electronical Information Materials and Devices Engineering Research Center of Ministry of EducationSchool of Materials Science and EngineeringGuilin University of Electronic TechnologyGuilin 541004China Guangxi Key Laboratory of Precision Navigation Technology and Application School of Information and CommunicationGuilin University of Electronic TechnologyGuilin 541004China

It is common sense that a phase interface(or grain boundary)could be used to scatter phonons in thermoelectric(TE)materials,resulting in low thermal conductivity(k).However,a large number of impurity phases are always so harmful to the transport of carriers that poor TE performance is ***,we demonstrate that numerous superior multiphase(AgCuTe,Ag_(−2)Te,copper telluride(Cu_(2)Te and Cu_(2−x)Te),and nickel telluride(NiTe))interfaces with simultaneous strong phonon scattering and weak electron scattering could be realized in AgCuTe-based TE *** to the similar chemical bonds in these phases,the depletion region at phase interfaces,which acts as carrier scattering centers,could be ***,the power factor(PF)is obviously enhanced from~609 to~832μW·m^(−1)·K^(−2),and k is simultaneously decreased from~0.52 to~0.43 W·m^(−1)·K^(−1) at 636 ***,a peak figure of merit(zT)of~1.23 at 636 K and an average zT(zTavg)of~1.12 in the temperature range of 523–623 K are achieved,which are one of the best values among the AgCuTe-based TE *** study could provide new guidance to enhance the performance by designing superior multiphase interfaces in the TE materials.

关键词： thermoelectric(TE)materials AgCuTe phase interface carrier scattering phonon scattering

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Toward developing Ti alloys with high fatigue crack growth resistance by additive manufacturing

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Journal of Materials Science & Technology 2023年第1期132卷 166-178页

作者： F.Wang L.M.Lei X.Fu L.Shi X.M.Luo Z.M.Song G.P.Zhang Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of Materials Science and Engineering University of Science and Technology of ChinaShenyang 110016China AECC Commercial Aircraft Engine Co. Ltd.Shanghai 201306China

Fatigue crack growth behaviors were investigated by three-point bending tests for TA19 alloy fabricated by laser metal deposition and four kinds of heat-treated *** crack growth resistance of the TA19 samples in the near-threshold regime and Paris regime was evaluated through the experimental characterization and theoretical analysis of the interaction between fatigue crack andα/βphase inter-face,columnar prior-βgrain boundary and colony *** results show that in the near-threshold regime,the fatigue crack propagation threshold and resistance increase with the increase of widths of lamellarαp phases and colonies,and the decrease of the number ofαlaths with an angle(ϕ)relative to the applied stress direction ranging from 75°to 90°.In the Paris regime,the fatigue cracking path can be deflected at colony boundaries or columnar prior-βgrain *** larger the deflection angle,the more tortuous the cracking path and the lower the fatigue crack growth *** angle(γ)of the columnar prior-βgrain growth direction relative to the build direction affects not onlyϕof differentαvariants,but also the fatigue cracking path deflection angle(θij)at columnar prior-βgrain *** optimal combination ofγ=0°-15°-0°-15°for several adjacent columnar prior-βgrains is derived from the theoretical analysis,and that can effectively avoidϕbeing in the range from 75°to 90°and makeθij as large as *** findings provide a guide for the selection of scanning strategies and process parameters to additively manufacture Ti alloys with high fatigue damage tolerance.

关键词： Ti alloy Fatigue crack growth Additive manufacturing phase interface Grain boundary

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INVESTIGATION ON 1/3[111] FRANK LEDGE DISLOCATIONS ATα_2/γinterface IN HOT-DEFORMED Ti-45Al-10Nb ALLOY

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Acta Metallurgica Sinica(English Letters) 1997年第4期10卷 323-328页

作者： J.G WanG L.C Zhang G.L. Chenand HQ. Ye(State Key Laboratory for Advanced Metals and Materials, Unborsity of Science and Technology Beijing,Beijing 100083, China)(Laboratory of Atond Imaging of Solids, Institute of Metal Research, Chinese Academy of Scienc Univ of Science and Technology Beijing Beijing China

The dislocation ledges at the α2/7 intedece in a hot-dejormed Ti-45Al-10N alloywere analyzed by high-resolution tmnsmission electron microscopy. A new type ofdislocation ledge containing 1/3[111] Frank partial was found. The height of the ledgestDas always three [111]γplanes. The Burpers vectore of these diBlocation ledges weredetermined to be 1/2[110] and 1/2<101] corresponding to the 90 dey. and 30 *** partials at noral ledges, i.e. 90 dep. ShockIey Partial dislocation +1/3[111]Frank partial dislocation; and 30 deg. Shockley partial dislocation + 1/3[111] Frankparfial dislocations. The jormation mechanism of this new tare of dislocation ledgewas discussed.

关键词： titanium aluminide thermomechanical treatment phase interface tmnsmission electron microscopy

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Effect of trace Ce and B additions on the microstructure of Nb-3Si-22Ti alloys

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Progress in Natural Science:Materials International 2017年第3期27卷 362-368页

作者： Meiling Wu Liwu Jiang Shiyu Qu Fengwei Guo Ming Li Yongwang Kang Yafang Han Science & Technology on Advanced High Temperature Structural Materials Laboratory AECC Beijing Institute of Aeronautical Materials National Center for Materials Service Safety University of Science and Technology Beijing

The effects of trace Ce and B additions on the microstructure Nb-22Ti-3Si alloys were *** microstructure of the alloys was observed by scanning electron microscope（SEM）,and their phase compositions were analyzed with X-ray diffraction（XRD） and Electro-Probe micro-analyzer（EPMA）.The distributions of the elements were detected by Spectrum *** interface of the phases in the alloys was investigated by transmission electron microscopy（TEM）.The results indicated that two phases of Nbss and Nb;Si presented in Nb-22Ti-3Si,Nb-22Ti-3Si-0.2Ce and Nb-22Ti-3Si-0.2B *** segregation of Ti at the interface between Nbss and Nb;Si was promoted and the volume fraction of silicides in the alloy increased with the trace B and Ce addition to the Nb-22Ti-3Si alloy *** there was no single and definite orientation relationship between Nb;Si and Nbss in Nb-22Ti-3Si,Nb-22Ti-3Si-0.2Ce and Nb-22Ti-3Si-0.2B *** with the Nb-22Ti-3Si alloy,the Nbss superlattice structure was found in Nb-22Ti-3Si-0.2Ce and Nb-22Ti-3Si-0.2B alloys.

关键词： Nb-3Si-22Ti alloy Nb3Si Ce B Microstructure phase interface Superlattice

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Water-in-Water Emulsions,Ultralow Interfacial Tension,and Biolubrication

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CCS Chemistry 2022年第6期4卷 2102-2114页

作者： Yitong Wang Jin Yuan Yunpeng Zhao Ling Wang Luxuan Guo Lei Feng Jiwei Cui Shuli Dong Shanhong Wan Weimin Liu Heinz Hoffmann Kiet Tieu Jingcheng Hao Key Laboratory of Colloid and interface Chemistry(Ministry of Education)&State Key Laboratory of Crystal Materials Shandong UniversityJinanShandong 250100 Department of Orthopedics Qilu HospitalCheeloo College of MedicineShandong UniversityJinanShandong 250012 Faculty of Engineering and Information Sciences University of WollongongWollongongNSW 2522 State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000 Physikalische Chemie I Bayreuth UniversitatBayreuth D-95447

A water-in-water(W/W)emulsion consists of droplets formed by the spontaneous liquid-liquid separation of two immiscible aqueous *** inherent properties of the W/W interfaces,low or ultralowinterfacial tension(γ_(W/W)=1-1000μN/m)and a large thickness of several nanometers,beget the poor inherent stability of ***,we report a nanofibril emulsifier having Schiff base reactivity to generate a W/W *** W/W emulsion has superior stability(stable>6 months)because collagen nanofibrils,acting as a stabilizer of W/W emulsions,can simultaneously satisfy the requirements of sizeandoverall coverage ratio of the phase interfaces.W/Wemulsions having γ_(W/W)∼10μN/m were used as synthetic synovial fluids,showing superior lubrication performance with a coefficient of friction in the range of 0.003-0.011,which has been demonstrated to be suitable for joint *** intraarticular injection assessment further confirmed this protective effect on articular cartilage in *** study reveals the mechanism of emulsion stabilization and opens up the possibility of osteoarthritis(OA)treatment using the biolubrication effects of W/W emulsions for lubricated artificial implant surfaces.

关键词： water-in-water emulsion ultralowinterfacial tension phase interface biolubrication

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Which is More Efficient as Compatibilizer： Di-block or Multiblock Copolymer？

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Chinese Journal of Chemical Physics 2006年第3期19卷 265-268页

作者： Da-chun Sun Hao-jun Liang Department of Educational Technology Baicheng Normal College Baicheng 137000 China Department of Polymer Science and Engineering University of Science and Technology of China Hefei 230026 China

Monte Carlo simulations were used to investigate the compatibilizing behaviors of multi-block copolymers with different architectures in A/B/（block copolymer） ternary blends. The volume fraction of homopolymer A, employed as the dispersed phase, was 19%. The simulations illustrate how a di- or multi-block copolymer aggregates at the interfaces and influences the phase behaviour of such incompatible polymer blends. The di-block copolymer chains tend to ＂stand＂ on the interface whereas the multi-block chains lie on the interface. In comparison with the di-block copolymer, the block copolymers with 4, or 10 blocks can occupy more areas on the interface, and thus the multi-block copolymers have higher efficiency for the retardation of the phase separation.

关键词： Monte Carlo simulation Compatibilizer phase interface

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