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Synergistic Coupling of Sulfide Electrolyte and integrated 3D FeS_(2)Electrode Toward Long-Cycling All-Solid-State Lithium Batteries

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Energy & Environmental Materials 2024年第5期7卷 68-76页

作者： wenyi liu Yongzhi Zhao Chengjun Yi w.ifei Hu Jiale Xia Yuanyuan Li Jinping liu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China School of Chemistry Chemical Engineering and Life ScienceWuhan University of TechnologyWuhan 430070China School of integrated Circuits Huazhong University of Science and TechnologyWuhan 430074China

FeS_(2)cathode is promising for all-solid-state lithium batteries due to its ultra-high capacity,low cost,and environmental ***,the poor performances,induced by limited electrode-electrolyte interface,severe volume expansion,and polysulfide shuttle,hinder the application of FeS_(2)in all-solid-state lithium ***,an integrated 3D FeS_(2)electrode with full infiltration of Li6PS5Cl sulfide electrolytes is designed to address these *** a 3D integrated design not only achieves intimate and maximized interfacial contact between electrode and sulfide electrolytes,but also effectively buffers the inner volume change of FeS_(2)and completely eliminates the polysulfide shuttle through direct solid-solid conversion of Li2S/***,the vertical 3D arrays guarantee direct electron transport channels and horizontally shortened ion diffusion paths,endowing the integrated electrode with a remarkably reduced interfacial impedance and enhanced reaction *** from these synergies,the integrated all-solid-state lithium battery exhibits the largest reversible capacity(667 mAh g^(-1)),best rate performance,and highest capacity retention of 82%over 500 cycles at 0.1 C compared to both a liquid battery and non-integrated all-solid-state lithium *** cycling performance is among the best reported for FeS_(2)-based all-solid-state lithium *** work presents an innovative synergistic strategy for designing long-cycling high-energy all-solid-state lithium batteries,w.ich can be readily applied to other battery systems,such as lithium-sulfur batteries.

关键词： 3D electrolyte infiltration all-solid-state batteries FeS_(2)nanosheets arrays integrated 3D electrodes sulfide electrolytes

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Blockchain for public safety:A survey of techniques and applications

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Journal of Safety Science and Resilience 2023年第4期4卷 389-395页

作者： Qi wang Yi liu institute of Public Safety Research Department of Engineering PhysicsTsinghua UniversityBeijing 100084China School of Safety Science Tsinghua UniversityBeijing 100084China Beijing Key Laboratory of City integrated Emergency Response Science Beijing 100084China

As an emerging technology,blockchain provides a range of advantages,such as decentralized and transparent data storage,secure access control,and enhanced data ***,it is rarely applied in the field of public *** paper presents an in-depth survey of blockchain technology,focusing on its potential applications and implications within the field of public safety *** explore the practical needs of multi-party data collaboration in emergency management and discusses the applicability and value of blockchain technology in this ***,this paper introduces and compares several popular blockchain *** providing a comprehensive examination of blockchain technology and its potential benefits for public safety,this paper seeks to enhance understanding of the technology’s capabilities,encourage further research,and inspire innovation in this domain.

关键词： Blockchain Public safety Data collaboration Data privacy

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Boundedness of the period maps and global Torelli theorem

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Science China Mathematics 2017年第6期60卷 1029-1046页

作者： liu KeFeng SHEN Yang Center of Mathematical Sciences Zhejiang University Department of Mathematics University of California at Los Angeles

Recently, we proved the Griffiths conjecture on the boundedness of the period maps, and then used it to prove global Torelli theorem on the Torelli space under certain natural conditions. This paper serves as a review... 详细信息

关键词： moduli spaces period maps affine structures Hodge metric completion global Torelli theorem

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Dynamic control of moirépotential in twisted wS_(2)-wSe_(2)heterostructures

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Nano Research 2022年第8期15卷 7688-7694页

作者： Shaofei Li Haihong Zheng Junnan Ding Biao wu Jun He Zongwen liu Yanping liu School of Physics and Electronics Hunan Key Laboratory for Super-microstructure and Ultrafast ProcessCentral South UniversityChangsha 410083China State Key Laboratory of High-Performance Complex Manufacturing Central South UniversityChangsha 410083China School of Chemical and Biomolecular Engineering The University of SydneyNSW 2006Australia The University of Sydney Nano institute The University of SydneyNSW 2006Australia Shenzhen Research institute of Central South University Shenzhen 518057China

Moirésuperlattices are formed by a lattice mismatch or twist angle in two-dimensional materials,w.ich can generate periodical moirépotentials leading to strong changes in the band structure,resulting in new quantum ***,the experimental engineering of in-situ deformation of moiréheterostructures remains ***,we demonstrate a dynamic local deformation of the twisted heterostructures using a diamond anvil cell(DAC),enabling in-situ dynamic modulation of moirépotential in twisted wS_(2)–wSe_(2)heterostructures at room *** of the twisted heterostructure increases the moirépotential,causing a red shift of the moiréexciton resonance,and observed the red shift of the intralayer exciton resonance up to 16.3 meV(less than 1.1 GPa).The blue shift of the interlayer excitons of twisted wS_(2)–wSe_(2)heterostructures shows an evident transition of the pressure sensitive exciton,induced by the dominant effect of modifying the band structure on optical *** with the spectral changes of pressurized Raman,w.ich further demonstrated that the DAC can efficiently regulate the interlayer *** results offer an effective strategy for in-situ dynamic modulation of moirépotential,providing a promising platform for the development of novel quantum devices.

关键词： moirésuperlattices twisted heterostructures moirépotential diamond anvil cell(DAC)

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Synthesis and characterization of trisubstituted heteropolytungstogermanates containing group 3A elements

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Chinese Journal of Chemistry 1995年第4期13卷 334-339页

作者： MENG, L liu, JF NE NORMAL UNiV DEPT CHEMCHANGCHUN 130024PEOPLES R CHINA CHiNESE ACAD SCi CHANGCHUN INST APPL CHEMCHANGCHUN 130022PEOPLES R CHINA

Six new compounds, alpha,beta-KaHb[Gew(9)M(3)(H2O)(3)O-37]. xH(2)O(M = Al, Ga, in; a + b = 7) and alpha-K9H5[Ge2w18Ga6(H2O)(3)O-74]. 20H(2)O, were synthesized from the lacunary precursors a and beta-Gew9O3410- and characterized by elemental analysis, spectroscopy and electrochemistry. Tungsten-183 NMR spectra of the title complexes consist of two lines with intensity ratio 2:1 as expected for trisubstituted heteropoly anions. The intensity ratio of alpha-Ga compound is 1:2, w.ich is different from others(a:1). with the help of FAB mass spectrum, we concluded that it is a dimer with D-3h structure in aqueous, and the others exist by monomers with C-3v structures.

关键词： TUNGSTOGERMANATES 3A ELEMENTS TRiSUBSTiTUTED HETEROPOLYANiONS w-183 NMR

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Effects of molecular w.ight and concentration of carboxymethyl cellulose on morphology of hydroxyapatite nanoparticles as prepared with one-step wet chemical method

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Frontiers of Environmental Science & Engineering 2015年第5期9卷 804-812页

作者： Ruiqiang liu Rattan LAL Carbon Management & Sequestration Center School of Environment & Natural Resources the Ohio State University Columbu OH 43210 USA

Nano-sized apatite particles （nAP） synthesized with carboxymethyl cellulose （CMC） have shown great application potentials in in situ heavy metal remediation. However, differences in CMC＇s properties effects on the size of nAP produced are not well understood. in this paper, two types of CMC, with respective molecular w.ights （Mw） of-120000 and -240000 Dalton or respective polymerization degrees of 500 （CMC-500） and 1050 （CMC-1050）, were studied in a concentration range of 0.05%-0.5% （w/w） for nAP synthesis. Morphology of the particles was characterized with transmission electron microscopy （TEM）. Results showed that 0.05% CMC- 500 solution gave an average particle size o f 148.7 -4-134.9 rim, 0.25% CMC-500 solution produced particles of 21.8~20.4nm, and, 0.5% CMC-500 solution contained particles of 15.8-4-7.7nm. in comparison, 0.05% CMC- 1050 solution produced nanoparticles of 6.8~3.2 rim, 0.25% CMC-1050 produced smaller nAP of 4.3-1-3.2 nm, and 0.5% CMC-1050 synthesized the smallest nanoparti- cles in this study, with an average diameter of 3.0~2.1 nm. Chemical composition of the products was identified with X-ray diffraction （XRD） as pure hydroxyapatite. interac- tions between nAP and CMC were discussed with help of attenuated total reflection Fourier transform infrared （ATR- FTiR） spectroscopic data. This study showed that CMC at higher concentration as well as higher Mw facilitated to produce finer nanoparticles, showing that nAP size could be manipulated by selecting appropriate CMC Mw and/or applying appropriate CMC concentration.

关键词： nanotechnology nanoparticles apatite carboxymethyl cellulose (CMC) particle size

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A new semi-tensor product of matrices

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Control Theory and Technology 2019年第1期17卷 4-12页

作者： Daizhan CHENG Zequn liu The Key Laboratory of Systems and Control Academy of Mathematics and Systems Sciences Chinese Academy of Sciences Beijing 700790 China University of Chinese Academy of Sciences Beijing 100049 China

A new matrix product, called the second semi-tensor product (STP-Ⅱ) of matrices is proposed. it is similar to the classical semi-tensor product (STP-i). First, its fundamental properties are presented. Then, the equivalence relation caused by STP-ii is obtained. Using this equivalence, a quotient space is also obtained. Finally, the vector space structure, the metric and the metric topology, the projection and subspaces, etc. of the quotient space are investigated in detail.

关键词： Second sime-tensor product (STP-Ⅱ) equivalence class quotient space topology metric

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Rational secret sharing as extensive games

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Science China(information Sciences) 2013年第3期56卷 69-81页

作者： ZHANG ZhiFang liu MuLan Key Laboratory of Mathematics Mechanization Academy of Mathematics and Systems ScienceChinese Academy of Sciences

The threat that comes from previously used punishment strategies in rational secret sharing is weakened because the punishment somtimes also causes loss to the punisher *** this paper,we first model 2-out-of-2 rational secret sharing in an extensive game with imperfect information,and then provide a strategy for achieving secret recovery in this ***,we prove that the strategy is a sequential equilibrium w.ich means after any history of the game no player can benefit from deviations so long as the other players stick to the *** particular,when a deviation is detected,the punishment executed by the punisher is still his optimal ***,by considering rational secret sharing as an extensive game,we design punishment strategies that effectively punish the deviants and meanw.ile guarantee punishers' ***,these punishments are more credible than previous *** assuming the existence of simultaneous channels,our scheme can have dealer off-line and extend to the t-out-of-n setting,and also satisfies computational equilibria in some sense.

关键词： rational secret sharing extensive game sequential equilibrium

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Location of Electric Vehicle Charging Station Based on Spatial Clustering and Multi-hierarchical Fuzzy Evaluation

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Transactions of Nanjing University of Aeronautics and Astronautics 2017年第1期34卷 89-96页

作者： wang Meng liu Kai School of Traffic and Transportation Beijing Jiaotong UniversityBeijing 100044P.R.China

For the charging station construction of electric vehicle,location selecting is a key *** are two problems in location selection of the electric vehicle charging *** is determining the location of charging station;the other is evaluating the location of charging *** determine the charging station location,an spatial clustering algorithm is proposed and *** example simulation shows the effectiveness of the spatial clustering *** evaluate the charging station location,a multi-hierarchical fuzzy method is *** on the location factors of electric vehicle charging station,the hierarchical evaluation structure of electric vehicle charging station location is constructed,including three levels,4first-class factors and 14second-class *** fuzzy multi-hierarchical evaluation model and algorithm are *** analysis results show that the multi-hierarchical fuzzy method can reasonably complete the electric vehicle charging station location evaluation.

关键词： electric vehicle charging station spatial clustering multi-hierarchical fuzzy evaluation

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Numerical research on airfoil transition delay by alternative current dielectric barrier discharge actuation

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Chinese Journal of Aeronautics 2021年第2期34卷 441-453页

作者： Bei liu Hua LiANG Zhonghua HAN Yinghong Li Fei liu Jiangbo CHi Zhiwen DiNG Science and Technology on Plasma Dynamics Laboratory Air Force Engineering UniversityXian 710038China institute of Aerodynamic and Multidisciplinary Design Optimization National Key Laboratory of Science and Technology on Aerodynamic Design and ResearchSchool of AeronauticsNorthwestern Poly technical UniversityXi'an 710072China

A Dielectric Barrier Discharge(DBD) plasma actuator can create a body force w.ich locally accelerates the base flow leading to an attenuation of broadband disturbance to delay the transition. in this study, numerical simulation on an NLF0416 airfoil is conducted to investigate transition delay and drag reduction by a DBD plasma actuator. To simulate plasma’s effect more accurately, boundary-layer data is acquired from Reynolds Averaged Navier Stocks(RANS) equations instead of laminar boundary layer equations, although RANS equations need a much finer boundary-layer grid, and the linear stability analysis method is used to analyze the boundary layer and get the transition point. in this study, the influences of different actuation intensities and positions are investigated, and results show that if the actuation intensity is stronger and the actuation position is closer to the base transition point, more drag reduction can be obtained. However, the efficiency of plasma transition delay is really low. For example, when the actuation voltage is 16 k V,the actuation frequency is 1 k Hz, and the main Mach number is 0.1, the saved power due to drag reduction is about 5.09 w, but the power consumed is about 32.61 w, and the efficiency is just15.6%.

关键词： Dielectric Barrier Discharge(DBD) Efficiency analysis Linear stability analysis Plasma flow control Plasma transition delay

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