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ZIF-8-functionalized polymer electrolyte with enhanced performance for high-temperature solid-state lithium metal batteries

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Rare Metals 2024年第3期43卷 984-994页

作者： Jin-Fang Zhang Yuan-Yuan Wang xiao-Feng li Gen-Yan Zhang Ying li rong liu Sheng-liang Hu Tuo-Ping Hu Ruth Knibbe Qing-Bing Xia School of Materials Science and Engineering North University of ChinaTaiyuan030051China School of energy and Power Engineering North University of ChinaTaiyuan030051China School of Chemistry and Chemical Engineering North University of ChinaTaiyuan030051China School of Mechanical and Mining Engineering The University of QueenslandBrisbaneQLD4072Australia

Solid polymer electrolytes(SPEs)with high ionic conductivity are desirable for solid-state lithium metal batteries(SSlMBs)to achieve enhanced safety and energy *** nanofillers into a polymeric matrix to develop nanocomposite solid electrolytes(NCSEs)has become a promising method for improving the ionic conductivity of the ***,a novel ZIF-8-functionalized NCSE was prepared for high-temperature S SlMB s using an in situ radical polymerization *** is found that the ZIF-8 nanoparticles could reduce the crystallinity of polymer segments and offer a lewis acid surface that promotes the dissociation of lithium bis(trifluoromethanesulfonyl)imide(liTFSI)and stabilizes the TFSI^(-) anion ***,the as-prepared NCSE exhibits an outstanding ionic conductivity of 1.63×10^(-3)S·cm^(-1),an electrochem ical stability window of 5.0 V at 80℃,and excellent interface compatibility with lithium metal anode with a stable polarization over 2.00 ***,the assembled SSlMBs with liFePO_(4)cathode show dendrite-free li-metal surface,good rate capability,and stable cycling stability with a capacity retention of 70%over 1000 cycles at a high temperature of 80℃.This work provides valuable insights into promoting the ionic conductivity of SPEs.

关键词： lithium metal batteries Metal-organic frameworks Solid polymer electrolytes lithium metal anode Interfacial compatibility

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Convection and correlation of coherent structure in turbulent boundary layer using tomographic particle image velocimetry

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chinese physics B 2014年第10期23卷 323-333页

作者：王维管新蕾姜楠 Department of Mechanics Tianjin University Tianjin key laboratory of Modern Engineering Mechanics The State key laboratory of Nonlinear Mechanics Institute of Mechanics Chinese Academy of Sciences

The present experimental work focuses on a new model for space-time correlation and the scale-dependencies of convection velocity and sweep velocity in turbulent boundary layer over a flat wail. A turbulent boundary layer flow at Reo = 2.60 is measured by tomographic particle image velocimetry （tomographic PIV）. It is demonstrated that arch, cane, and hairpin vortices are dominant in the logarithmic layer. Hairpins and hairpin packets are responsible for the elongated low-momentum zones observed in the instantaneous flow field. The conditionally-averaged coherent structures systemically illustrate the key roles of hairpin vortice in the turbulence dynamic events, such as ejection and sweep events and {2. transport. The space-time correlations of instantaneous streamwise fluctuation velocity are calculated and confirm the new elliptic model for the space-time correlation instead of Taylor hypothesis. The convection velocities derived from the space-time correlation and conditionally-averaged method both suggest the scaling with the local mean velocity in the logarithmic layer. Convection velocity result based on Fourier decomposition （FD） shows stronger scale- dependency in the spanwise direction than in streamwise direction. Compared with FD, the proper orthogonal decomposition （POD） has a distinct distribution of convection velocity for the large- and small-scales which are separated in light of their contributions of turbulent kinetic {2..

关键词： turbulent boundary layer tomographic particle image velocimetry space-time correlation ellipticmodel

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A Simulator for Producing of high Flux Atomic Oxygen Beam by Using ECR Plasma Source

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Journal of Materials Science & Technology 2004年第6期20卷 759-762页

作者： Shuwang DUO, Meishuan lI and Yaming ZHANGShenyang National laboratory for Materials Science, institute of Metal Research,{2., Shenyang 110016, China Shenyang Natl. lab. for Mat. Sci. Inst. of Metal Res. Chinese Acad. of Sci. Shenyang 110016 China

In order to study the atomic oxygen corrosion of spacecraft materials in low earth orbit environment, an atomic oxygen simulator was established. In the simulator, a 2.45 GHz microwave source with maximum power of 600 W was launched into the circular cavity to generate ECR (electron cyclotron resonance) plasma. The oxygen ion beam moved onto a negatively biased Mo plate under the condition of symmetry magnetic mirror field confine, then was neutralized and reflected to form oxygen atom beam. The properties of plasma density, electron temperature, plasma space potential and ion incident energy were characterized. The atomic oxygen beam flux was calibrated by measuring the mass loss rate of Kapton during the atomic oxygen exposure. The test results show that the atomic oxygen beam with flux of 1016-1017 atoms-cm-2.s-1 and energy of 5-30 eV and a cross section of φ80 mm could be obtained under the operating pressure of 10-1-10-3 Pa. Such a {2. flux source can provide accelerated simulation tests of materials and coatings for space applications.

关键词： Atomic oxygen low earth orbit space environment ECR plasma Microwave

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STUDIES ON THERMOSTABIlITY OF MODEl MoO4 TETRAHEDRA

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chinese Journal of Catalysis 1998年第4期 4-5页

作者： Guo Jianchang, Ren Suzhen, luo Hongbo, Bao Xinhe, Zhai Runsheng ** (State key laboratory of Catalysis, Dalian {2. of Chemical physics, The chinese academy of sciences, Dalian 11602.)

ＳＴＵＤＩＥＳＯＮＴＨＥＲＭＯＳＴＡＢＩＬＩＴＹＯＦＭＯＤＥＬＭｏＯ４ＴＥＴＲＡＨＥＤＲＡＧｕｏＪｉａｎｃｈａｎｇ，ＲｅｎＳｕｚｈｅｎ，ＬｕｏＨｏｎｇｂｏ，ＢａｏＸｉｎｈｅ，ＺｈａｉＲｕｎｓｈｅｎｇ（Ｓｔａｔｅ... 详细信息

ＳＴＵＤＩＥＳＯＮＴＨＥＲＭＯＳＴＡＢＩＬＩＴＹＯＦＭＯＤＥＬＭｏＯ４ＴＥＴＲＡＨＥＤＲＡＧｕｏＪｉａｎｃｈａｎｇ，ＲｅｎＳｕｚｈｅｎ，ＬｕｏＨｏｎｇｂｏ，ＢａｏＸｉｎｈｅ，ＺｈａｉＲｕｎｓｈｅｎｇ（ＳｔａｔｅＫｅｙＬａｂｏｒａｔｏｒｙｏｆＣａ...

关键词： Oxygen Molybdenum high resolution electron energy loss spectroscopy (HREElS) Classification No O647

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STUDIES ON THE FORMATION OF BIMETAllIC Rh-CoClUSTERS FROM MONOMETAllIC RHODIUM ANDCOBAlT ClUSTERS

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Journal of energy Chemistry 1997年第3期 188-189+1909191-197页

作者： HUANG lin XU Yi-De(State key laboratory of Catalysis )(Dalian {2. of Chemical physics. The chinese academy of sciences Dalian, liaoning 11602.)

According to in situ IR and catalytic investigations, RhCo3(CO)12.can be effectively formed from Rh4(CO)12.and Co2.CO)8 by coimpregnation on the SiO2.surface. In situ IR results show that the surface behavior under CO of a SiO2.supported monometallic rhodium and cobalt sample derived from Rh4(CO)12.and Co2.CO) after H2.reduction is similar to that of RhCo3(CO)12.SiO2. The carbonylation of RhCo3 results in the generation of RhCo3(CO)12.on the surface. Catalytic results illustrate that the catalyst obtained from Rh4(CO)12.and Co2.CO)8 by coimpregnation and RhCo3(CO)12.SiO2.have similar catalytic properties in ethylene hydroformylation.

关键词： rhodium carbonyl cluster cobalt carbonyl cluster formation of RhCo3(CO)12 silica coimpregnation hydroformylation

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Spin-orbit interaction induced Casimir-lifshitz torque between two-dimensional electron gases

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Science China(physics,Mechanics & Astronomy) 2024年第8期67卷 134-142页

作者： Jia-Nan rong liang Chen Kai Chang State key laboratory of Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China School of Mathematics and physics North China Electric Power UniversityBeijing 102206China School of physics Zhejiang UniversityHangzhou 310027China College of Materials Science and Opto-electronic Technology University of Chinese Academy of SciencesBeijing 100049China

We investigate theoretically the Casimir interaction between two parallel two-dimensional electron gases(2.EGs)with Rashba and Dresselhaus spin-orbit interactions(SOIs),based on the quantum field *** derive an analytical expression for the polarization tensor and obtain the solution to the motion equation of the electromagnetic(EM)*** calculate the Casimirlifshitz torque(ClT)between two parallel 2.EGs with Rashba and Dresselhaus SOIs,which can be tuned by changing the relative strength between two *** anisotropic Casimir energy between 2.EGs caused by the interplay between the SOIs of 2.EGs offers a new origin of ClT and a new type of optoelectronic device.

关键词： Casimir torque two-dimensional electron gas spin-orbit interaction

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Wearable leg Movement Monitoring System for high-Precision Real-Time Metabolic energy Estimation and Motion Recognition

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Research 2024年第2期2023卷 417-429页

作者： Jinfeng Yuan Yuzhong Zhang Shiqiang liu rong Zhu State key laboratory of Precision Measurement Technology and Instruments Department of Precision InstrumentTsinghua UniversityBeijing 100084China

Comprehensive and quantitative assessment of human physical activity in daily life is valuable for healthcare,especially for those who suffer from obesity and neurological disorders or are at high risk of *** wearable devices,e.g.,smartwatches,are insufficient and inaccurate for monitoring highly dynamic limb movements and assessing human ***,we report a new wearable leg movement monitoring system incorporating a custom-made motion sensor with machine learning algorithm to perceive human motion accurately and comprehensively during diverse walking and running *** system enables real-time multimodal perceptions of personal identity,motion state,locomotion speed,and {2. expenditure for wearers.A general law of extracting real-time metabolic {2. from leg movements is verified although individual gaits show *** addition,we propose a novel sensing configuration combining unilateral lower leg movement velocity with its angular rate to achieve high accuracy and good generalizability while simplifying the wearable *** performances in personal identification(accuracy of 98.7%)and motion-state recognition(accuracy of 93.7%)are *** wearable system also exhibites high-precision real-time estimations of locomotion speed(error of 3.04%to 9.68%)and metabolic {2.(error of 4.18%to 14.71%)for new subjects across various time-varying *** wearable system allows reliable leg movement monitoring and quantitative assessment of bodily kinematic and kinetic behaviors during daily activities,as well as safe identity authentication by gait parameters,which would greatly facilitate smart life,personal healthcare,and rehabilitation training.

关键词： smart enable monitoring

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Numerical exploration of new features on three-dimensional transition of a cylinder wake

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Science China Mathematics 2004年第Z1期47卷 69-80页

作者： lING Guocan, XIONG Jun & ZHU KeqinState key laboratory of Nonlinear Mechanics, {2. of Mechanics, chinese academy of sciences, Beijing 100080, China Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China State key laboratory of Nonlinear Mechanics Institute of Mechanics Chinese Academy of Sciences Beijing China Department of Engineering Mechanics Tsinghua University Beijing China

The three-dimensional transition of the wake flow behind a circular cylinder is studied in detail by direct numerical simulations using 3D incompressible N-S equations for Reynolds number ranging from 2.0 to 300. New features and vortex dynamics of the 3D transition of the wake are found and investigated. At Re = 2.0, the flow pattern is characterized by mode A instability. However, the spanwise characteristic length of the cylinder determines the transition features. Particularly for the specific spanwise characteristic length linear stable mode may dominate the wake in place of mode A and determine the spanwise phase difference of the primary vortices shedding. At Re = 2.0 and 300 it is found that the streamwise vortices evolve into a new type of mode "dual vortex pair mode" downstream. The streamwise vortex structures switch among mode A, mode B and dual vortex pair mode from near wake to downstream wake. At Re = 2.0, an independent low frequency fm in addition to the vortex shedding frequency fs is identified. Frequency coupling between fm and fs occurs. These result in the irregularity of the temporal signals and become a key feature in the transition of the wake. Based on the formation analysis of the streamwise vorticity in the vicinity of cylinder, it is suggested that mode A is caused by the emergence of the spanwise velocity due to three dimensionality of the incoming flow past the cylinder. energy distribution on various wave numbers and the frequency variation in the wake are also described.

关键词： cylinder, wake, 3D transition, Fourier-spectral-spectral-element method, direct numerical simulation (DNS).

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Cationic ordering transition in oxygen-redox layered oxide cathodes

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Carbon energy 2024年第1期6卷 197-206页

作者： Xinyan li Ang Gao Qinghua Zhang Hao Yu Pengxiang Ji Dongdong xiao Xuefeng Wang Dong Su xiaohui {2. Xiqian Yu Hong li Yong-Sheng Hu lin Gu Beijing National laboratory for Condensed Matter physics Institute of PhysicsChinese Academy of SciencesBeijingChina College of Materials Science and Opto-Electronic Technology University of Chinese Academy of SciencesBeijingChina Beijing National Center for Electron Microscopy and laboratory of Advanced Materials School of Materials Science and EngineeringTsinghua UniversityBeijingChina Beijing Advanced Innovation Center for Materials Genome Engineering Huairou DivisionInstitute of PhysicsChinese Academy of SciencesBeijingChina

Understanding the structural origin of the competition between oxygen 2. and transition-metal 3d orbitals in oxygen-redox(OR)layered oxides is eminently desirable for exploring reversible and high-energy-density li/Na-ion ***,we reveal the correlation between cationic ordering transition and OR degradation in ribbon-ordered P3-Na_(0.6)li_(0.2.Mn_(0.8)O_(2. via in situ structural *** two different voltage windows,the OR capacity can be improved approximately twofold when suppressing the in-plane cationic ordering *** find that the intralayer cationic migration is promoted by electrochemical reduction from Mn^(4+)to Jahn–Teller Mn^(3+)and the concomitant NaO_(6) stacking transformation from triangular prisms to octahedra,resulting in the loss of ribbon ordering and electrochemical ***-principles calculations reveal that Mn^(4+)/Mn^(3+)charge ordering and alignment of the degenerate eg orbital induce lattice-level collective Jahn–Teller distortion,which favors intralayer Mn-ion migration and thereby accelerates OR *** findings unravel the relationship between in-plane cationic ordering and OR reversibility and highlight the importance of superstructure protection for the rational design of reversible OR-active layered oxide cathodes.

关键词： cationic ordering layered oxide cathodes oxygen redox sodium-ion batteries

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Ground state and polaron and bipolaron excited states in polydiacetylene

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Science China(physics,Mechanics & Astronomy) 2006年第4期49卷 430-439页

作者： lI Yuan1, HU Guichao1, XIA Caijuan1, lIU Desheng1,2.& XIE Shijie1,2.1. School of physics and Microelectronics, Shandong University, Jinan 2.0100, China 2. National key {2. of Crystal Materials, Shandong University, Jinan 2.0100, China School of physics and Microelectronics Shandong University Jinan China National key laboratory of Crystal Materials Shandong University Jinan China

The electronic properties of ground state and charged excited states of nondegenerate polydiacetylene were investigated by means of a tight-binding model. The parameters of the model were obtained by comparison of the experimental and other theoretical results. It was found that there is a stable dimerized structure of polydiacetylene in ground state and the doping induces the nonlinear excitations, such as polarons and bipolarons. In order to compare the stability of polaron and bipolaron, the creation energy and binding energy were separately defined. By neglecting the electron-electron Coulomb interaction, a bipolaron is more stable than two independent polarons.

关键词： dimerization, polaron, bipolaron, binding energy.

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