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designing Cation–Solvent Fully Coordinated Electrolyte for High-Energy-Density Lithium–Sulfur Full Cell Based On Solid–Solid Conversion

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Angewandte Chemie 2021年第32期133卷

作者： Huijun Yang Dr. Yu Qiao Dr. Zhi Chang Prof. Ping He Prof. Haoshen Zhou Energy Technology Research Institute National Institute of Advanced Industrial Science and Technology (AIST) 1-1-1 Umezono Tsukuba 305-8568 Japan Graduate School of System and Information Engineering University of Tsukuba 1-1-1 Tennoudai Tsukuba 305-8573 Japan Center of Energy Storage Materials & Technology College of Engineering and Applied Sciences Jiangsu Key Laboratory of Artificial Functional Materials National Laboratory of Solid State Micro-structures Collaborative Innovation Center of Advanced Micro-structures Nanjing University Nanjing 210093 P. R. China

Sulfur chemistry based on solid–liquid dissolution-deposition route inevitably encounters shuttle of lithium polysulfides, its parasitic interaction with lithium (Li) anode and flood electrolyte environment. The sulfurized pyrolyzed poly(acrylonitrile) (S@pPAN) cathode favors solid-solid conversion mechanism in carbonate ester electrolytes but fails to pair high-capacity Li anode. Herein, we rationally design a cation-solvent fully coordinated ether electrolyte to simultaneously resolve the problems of both Li anode and S@pPAN cathode. Raman spectroscopy reveals a highly suppressed solvent activity and a cation-solvent fully coordinated structure (molar ratio 1:1). Consequently, Li electrodeposit evolves into round-edged morphology, LiF-rich interphase, and high reversibility. Moreover, S@pPAN cathode inherits a neat solid-phase redox reaction and fully eliminated the dissolution of lithium polysulfides. Finally, we harvest a long-life Li-S@pPAN pouch cell with slight Li metal excessive (0.4 time) and ultra-lean electrolyte design (1 μL mg S −1 ), delivering 394 Wh kg −1 energy density based on electrodes and electrolyte mass.

关键词： high-energy-density lithium-sulfur battery metal-organic framework (MOF) S@pPAN cathode solid-solid conversion

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An investigation of numerical performance enhancement of RELAP5: Numerical stability, higher resolution and an alternative constitutive relation

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Nuclear Engineering and design 2018年 328卷 309-320页

作者： Wei Li Xiaoli Wu Koroush Shirvan Guanghui Su Science Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu 610213 China Massachusetts Institute of Technology 77 Massachusetts Ave Cambridge MA 02139 USA School of Nuclear Science and Technology Xi’an Jiaotong University No. 28 Xianning West Road Xi’an Shanxi 710049 China

The nuclear reactor safety system code RELAP5 decomposes complex flow system of a nuclear reactor into a series of one-dimensional control volumes connected by flow junctions, and solves a set of two-phase two-fluid equations to predict the nuclear reactor system behavior. In spite of its extensive applications, there indeed exist many numerical shortcomings in RELAP5 and it is desirable to constantly improve its numerical performance. In the present work, the numerical performance improvement to RELAP5/MOD3 is carried out from the aspects of numerical stability, high-resolution and alternative constitutive relations. For the enhancement of numerical stability, the virtual mass term is replaced and an interfacial pressure term is added in the phase momentum equations of RELAP5 to make all the characteristic roots real, thus improve the model’s hyperbolicity. In addition, the second-order Minmod TVD flux-limiter scheme replaces the original first-order upwind scheme for advection terms to reduce the numerical diffusion. Furthermore, an alternative interphase friction relation is substituted for the built-in model in RELAP5 to calculate the interphase drag for bubbly/slug flow in the vertical bundle channels. The performance improvement measures work reasonably well, as indicated by the simulation of selected numerical examples and the Bethsy 6.2TC integral effect experiment which corresponds to an intermediate break Pressurized Water reactor Loss of Coolant Accident (PWR LOCA).

关键词： Virtual mass force Interfacial pressure Flux-limiter Interphase friction RELAP5

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Preliminary study on the radiation heat removal capacity in SMR core under high temperature condition

Preliminary study on the radiation heat removal capacity in ...

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2017 International Congress on Advances in Nuclear Power Plants: A New Paradigm in Nuclear Power Safety, ICAPP 2017

作者： Li, Zhongchun Ding, Shuhua Li, Songwei Deng, Jian Nulcear Power Institute of China Chengdu610041 China Science and Technology on Reactor System Design Technology Laboratory Chengdu610041 China

ISBN: (纸本)9784890471676

The advanced fuel design, such as accident tolerant fuel (ATF) was design concept to withstand the high temperatures for extreme condition. When it was equipped in reactor core, the heat removal by radiation would be quite considerable. The radiation heat removal in a simplified SMR core was studied in the present study. The calculation was assumed to be 2D and at steady state. The calculation models were established from fuel assembly to fuel rod. The radiation heat flux was calculated based on the heat balance model when the limitation temperature in the core was reached. The results showed that the radiation heat flux contribute large proportion when the limitation temperature on fuel clad was high. The radiation heat flux was increased with fuel clad temperature limitation value. The higher the emissivity was, the more radiation heat flux removed.

关键词： Temperature

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Formation control for multiple agents with local measurements: Continuous-time and sampled-data-based cases

arXiv

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arXiv 2019年

作者： Wang, Chen Li, Shuai Xia, Weiguo Sun, Jinan Xie, Guangming National Engineering Research Center for Software Engineering Peking University Beijing100871 China Key Laboratory of Intelligent Control and Optimization for Industrial Equipment of Ministry of Education School of Control Science and Engineering Dalian University of Technology Dalian116024 China State Key Laboratory of Turbulence and Complex Systems Intelligent Biomimetic Design Lab College of Engineering Peking University Beijing100871 China

We study the formation control problem for a group of mobile agents in a plane, in which each agent is modeled as a kinematic point and can only use the local measurements in its local frame. The agents are required to maintain a geometric pattern while keeping a desired distance to a static/moving target. The prescribed formation is a general one which can be any geometric pattern, and the neighboring relationship of the N-agent system only has the requirement of containing a directed spanning tree. To solve the formation control problem, a distributed controller is proposed based on the idea of decoupled design. One merit of the controller is that it only uses each agent's local measurements in its local frame, so that a practical issue that the lack of a global coordinate frame or a common reference direction for real multi-robot systems is successfully solved. Considering another practical issue of real robotic applications that sampled data is desirable instead of continuous-time signals, the sampled-data based controller is developed. Theoretical analysis of the convergence to the desired formation is provided for the multiagent system under both the continuous-time controller with a static/moving target and the sampled-data based one with a static target. Numerical simulations are given to show the effectiveness and performance of the controllers. Copyright © 2019, The Authors. All rights reserved.

关键词： Multi agent systems

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PBDW method for state estimation: Error analysis for noisy data and nonlinear formulation

arXiv

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arXiv 2019年

作者： Gong, Helin Maday, Yvon Mula, Olga Taddei, Tommaso Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610041 China Paris75005 France Institut Universitaire de France Paris75005 France Université Paris-Dauphine PSL Research University CNRS UMR 7534 CEREMADE Paris75016 France IMB UMR 5251 Univ. Bordeaux Talence33400 France Inria Bordeaux Sud-Ouest Team MEMPHIS Talence33400 France

We present an error analysis and further numerical investigations of the Parameterized-Background Data-Weak (PBDW) formulation to variational Data Assimilation (state estimation), proposed in [Y Maday, AT Patera, JD Penn, M Yano, Int J Numer Meth Eng, 102(5), 933-965]. The PBDW algorithm is a state estimation method involving reduced models. It aims at approximating an unknown function utrueliving in a highdimensional Hilbert space from M measurement observations given in the form ym= m(utrue), m = 1, ⋯, M, where mare linear functionals. The method approximates utruewith u = z + η. The background Z belongs to an N-dimensional linear space ZNbuilt from reduced modelling of a parameterized mathematical model, and the update η belongs to the space UMspanned by the Riesz representers of (1, ⋯, M). When the measurements are noisy - i.e., ym= m(utrue) + ϵmwith ϵmbeing a noise term - the classical PBDW formulation is not robust in the sense that, if N increases, the reconstruction accuracy degrades. In this paper, we propose to address this issue with an extension of the classical formulation, which consists in searching for the background z either on the whole ZNin the noise-free case, or on a well-chosen subset KN⊂ ZNin presence of noise. The restriction to KNmakes the reconstruction be nonlinear and is the key to make the algorithm significantly more robust against noise. We further present an a priori error and stability analysis, and we illustrate the efficiency of the approach on several numerical examples. Copyright © 2019, The Authors. All rights reserved.

关键词： Parameterization

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A Dual-Band Multilayer Heterogeneous Frequency Selective Surface with Miniaturized Unit Cell

A Dual-Band Multilayer Heterogeneous Frequency Selective Sur...

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IEEE International Conference on Computational Electromagnetics (ICCEM)

作者： Yichun Cui Shengjun Zhang Jiaqi Liu Xin liu Hui Xue Borong Zhang National Key Laboratory of Science and Technology on Test Physics and Numerical Mathematics Beijing China National Key Laboratory of Science and Technology on Test Physics and Numerical Mathematics Beijing 100076 China Beijing Institute of System Engineering Beijing China

ISBN: (纸本)9781538612422

In terms that most researches about Frequency Selective Surface (FSS) concentrate on single layer structure design or FSS with one fundamental mode, a multilayer heterogeneous dual-band frequency selective surface composed of slot FSS, dielectric medium, patch FSS is proposed. This FSS possess miniaturized unit cell with dimension of 6×6mm 2 , it acts as a dual-band filter in given bands while behaving as an entire reflector in others. Results show that this dual-band frequency selective surface has narrow transmission bandwidths near 8.5GHz and 19.5GHz and flat rejection bands except for that. The structure exhibits excellent stability for oblique incident angles and provides polarization-independent response with compact design which moves the operating bands away from grating lobes. A method to adjust the element's size is proposed as well based on basic elements when given pass band frequency changed.

关键词： electromagnetic wave polarisation frequency selective surfaces microwave filters multilayers frequency selective surfaces electromagnetic wave polarisation Microwave filters unit cell multilayers Dual band belt cleaner compact design

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A numerical simulation method of co-flow jet airfoil with energy system inside the duct 9th

A numerical simulation method of co-flow jet airfoil with en...

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9th AIAA Flow Control Conference, 2018

作者： Li, Kai Song, Wenping Xu, Jianhua Han, Zhonghua National Key Laboratory of Science and Technology on Aerodynamic Design and Research School of Aeronautics Northwestern Polytechnical University Department of Fluid Mechanics Youyi West Road No. 127 P.O. Box754 Xi’an710072 China

ISBN: (数字)9781624105548

ISBN: (纸本)9781624105548

This paper studies the low speed performance of co-flow jet airfoil with energy system inside the duct. Based on actuator disk theory, the energy system-pump or fan, can be simplified to an ideal actuator disk without thickness, and across the disk the velocity and density of flow are held constant, while the pressure increases. Based on this theory, the two-dimensional flow of the CFJ6415 airfoil is simulated, and a new method for calculating the reaction force is proposed. The simulation employs the validated in-house code, PMNS2D, using Reynolds Averaged Navier-Stokes(RANS) equations with one-equation Spalart-Allmaras turbulence model. Two types of pressure increase distribution across the actuator disk are considered in the numerical simulations. One is uniform and the other is distributed, obtained from a real blade. The numerical simulation results are in good agreement with experimental data, indicating that the numerical simulation method proposed in this paper can well simulate CFJ airfoil with energy system inside the duct. It is of great significance to the design of the inner duct and practical application of co-flow jet technology. © 2018, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： Airfoils

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Calculation strategy for the determination of plasticity correction factors 13th

Calculation strategy for the determination of plasticity cor...

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13th Asia-Pacific Symposium on Engineering Plasticity and its Applications, AEPA 2016

作者： Du, Juan Shao, Xue Jiao Kan, Qian Hua Zhang, Ying Fu, Xiao Long Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610041 China Southwest Jiaotong University Chengdu610031 China

ISBN: (纸本)9783035710243

This paper presents an investigation about the plasticity correction factor, Ke, proposed in the RCC-M code, for the correction of elastic stress range exceeds twice the yield stress which results from both mechanical and thermal loading. The plasticity correction factors are analyzed using a calculation strategy based on the comparison between linear elastic and elastoplastic analyses. The RCC-M code provides the codified expressions of Ke and material parameters for general materials of components in nuclear power plant, but there are no expressions and material parameters for new materials. Several elastoplastic models, geometries and loading types are considered in this study based on the general materials listed in RCC-M code to determine the calculation strategy of Ke for new material. Based on the results, the expressions and parameters of Ke for titanium alloy are discussed. It turns the proposed Ke factor of titanium alloy can yield to sufficiently conservative results. A verification calculation of general materials is performed and the conservative allowance is obtained. © 2017 Trans Tech Publications, Switzerland.

关键词： Plasticity

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Meso-macro scale model for dynamic fracture of functional graded material 14

Meso-macro scale model for dynamic fracture of functional gr...

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14th International Conference on Fracture, ICF 2017

作者： Bai, Xiaoming Shi, Kaikai Guo, Licheng Zheng, Liangang Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610213 China Department of Astronautic Science and Mechanics Harbin Institute of Technology Harbin150001 China

A meso-macro scale model for dynamic fracture of functional graded material is proposed in present work. The dynamic piecewise-exponential (DPE) model is extended to the meso-macro scale by the data mining method. With present model, the influence of meso-scale design parameters on macro-scale fracture behaviors can be investigated conveniently. Thus, the material design procedures and the fracture analysis of FGM are connected. © 2017 ICF 2017 - 14th International Conference on Fracture. All rights reserved.

关键词： Fracture

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Dirac Fermionsin Antiferromagnetic FeSn Kagome Latticeswith Combined Space Inversion and Time ReversalSymmetry

arXiv

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arXiv 2019年

作者： Lin, Zhiyong Wang, Chongze Wang, Pengdong Yi, Seho Li, Lin Zhang, Qiang Wang, Yifan Wang, Zhongyi Sun, Yan Sun, Zhe Cho, Jun-Hyung Zeng, Changgan Zhang, Zhenyu Department of Physics International Center for Quantum Design of Functional Materials University of Science and Technology of China Hefei National Laboratory for Physical Sciences at the Microscale Cas Key Laboratory of Strongly Coupled Quantum Matter Physics Synergetic Innovation Center of Quantum Information & Quantum Physics Hefei Anhui 230026 China Research Institute for Natural Science Department of Physics Hanyang University 222 Wangsimni-ro Seongdong-Ku Seoul 04763 Korea Republic of National Synchrotron Radiation Laboratory University of Science and Technology OfChina Hefei Anhui 230029 China Max Planck Institute for Chemical Physics of Solid Dresden Germany

Symmetry principles play a critical role in formulating the fundamental laws of nature1,with a large number of symmetry-protected topological states identified in recent studies of quantum materials2,3. As compelling examples, massless Dirac fermions are jointly protected by the space inversion symmetry Pand time reversal symmetry T supplemented by additional crystalline symmetry4-8, while evolving into Weyl fermions when either Por Tis broken4,***, such massless Dirac fermionsare expected to survive when each of the P and T symmetries is individually broken but the combined PT symmetry is preserved12. To date, this conceptually intriguing prediction remains to be experimentally validated. Here, based on angle-resolved photoemission spectroscopy (ARPES)aided by first-principles calculations, we present the first experimental observation of massless Dirac fermions in a layered FeSn crystal containing antiferro magnetically coupled ferromagnetic Fe kagome layers. In this system, each of the P and T symmetries is individually broken, but the stable Dirac points are protected by the combined PT symmetry with additional on-symmorphic S2zsymmetry. We further demonstrate that by breaking the PT or S2zsymmetry, we can transform the massless Dirac fermions into massless Weyl or massive Dirac fermions. The present study substantially enriches our fundamental understanding of the intricate connections between symmetries and topologies of matter, especially with the spin degree of freedom playing a vital role. Copyright © 2019, The Authors. All rights reserved.

关键词： Tin alloys

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