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In situ analysis of dynamic evolution of the additive-regulated cathode processes in quasi-solid-state lithium-metal batteries

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Science China Chemistry 2023年第10期66卷 2921-2928页

作者： Jian-Xin Tian Hui-Juan Guo Jing wan Gui-xian Liu Rui Wen Li-Jun wan CAS Key Laboratory of Molecular Nanostructure and Nanotechnology CAS Research/Education Center for Excellence in Molecular SciencesBeijing National Laboratory for Molecular ScienceInstitute of ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

The implementation of high-energy-density storage devices can be facilitated by the built-in situ cathode electrolyte interphase(CEI)between Ni-rich cathodes and gel polymer electrolytes,as it improves interfacial compatibility and enhances *** the interphase processes of cathode materials,including the structural evolution and the formation of cathode electrolyte interphase upon charging/discharging,is crucial for the design of solid-state lithium ***,we employed in situ atomic force microscopy(AFM)to investigate the effects of lithium difluoro(oxalato)borate(Li DFOB)on the dynamic evolution of the cathode *** the presence of Li DFOB,the adhesion of nanoparticles and a thin amorphous film on the cathode surface resulted in the formation of a homogeneous CEI,inducing the production of LixPFyas ***,the stable CEI formed between the cathode and electrolyte helps maintain the integrity of the composition and structure,reduces interfacial resistance,and improves the cycle stability of the *** visualization of in situ AFM in quasi-solid-state lithium-metal batteries provides valuable insights into the distinct nanostructures and growth dynamics of Li DFOB-mediated CEI on the LiNi_(6)Co_(2)Mn_(2)O_(2) cathode,thus offering a universal and convenient technique for interfacial analysis and a mechanistic understanding of solid-state batteries.

关键词： atomic force microscopy electrochemistry interfacial dynamics solid-state lithium batteries cathode electrolyte interphase

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Quasicrystal dissolution and performance of isothermally heat-treated Mg–Zn–Y alloy

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Rare Metals 2015年第7期34卷 452-456页

作者： Di-Qing wan xian Luo Ya-Juan Liu Tian Yu Key Laboratory of Ministry of Education for Conveyance and Equipment East China Jiaotong University State Key Laboratory of Solidification Processing Northwestern Polytechnical University School of Materials Science Northwestern Polytechnical University

Conventional casting method was employed to prepare Mg–Zn–Y alloy only with a-Mg+I-phase; however, the grain size of quasicrystal is quite large in the ascast ***, isothermal treatment was applied to refine the quasicrystal *** result shows that after the Mg–Zn–Y alloy was isothermally treated at 500 °C for several hours, the coarse quasicrystal can be gradually dissolved and thus ***, the dissolving processes of quasicrystal are slow first and then accelerate;after isothermally treated with 8 h at 500 °C, the quasicrystal is almost completely dissolved into the matrix only with 1–5 lm tiny quasicrystals *** of quasicrystal can markedly reduce the wear resistance, but increase the corrosion resistance.

关键词： Magnesium alloy Quasicrystal Isothermal treatment

Microscopic Superconductivity and Room Temperature Electronics of High-T_c Cuprates

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Communications in Theoretical Physics 2008年第11期50卷 1237-1240页

作者： LIU Fu-Su CHEN wan-fang Department of Physics Peking University Beijing 100871 China Graduate School Chinese Academy of Sciences Beijing 100080 China

Abstract This paper points out that the Landau criterion for macroscopic superfluidity of He H is only a criterion for microscopic superfluidity of ^4He, extends the Landau criterion to microscopic superconductivity in fermions （electron and hole） system and system with Cooper pairs without long-range phase coherence. This paper gives another three non-superconductive systems that are of microscopic superconductivity. This paper demonstrates that one application of microscopic superconductivity is to establish room temperature electronics of the high-To cuprates.

关键词： superconductivity Landau criterion long-range phase coherence

Room-temperature ferromagnetism enhancement in Fe-doped VSe2nanosheets synthesized by a chemical method

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Rare Metals 2021年第9期40卷 2501-2507页

作者： Li-Yan Hu Li-fang Yu Huan Yang xian Xu fang wang Xiao-Hong Xu School of Chemistry and Materials Science Shanxi Normal UniversityLinfen 041004China Key Laboratory of Magnetic Molecules and Magnetic Information Materials Ministry of EducationLinfen 041004China Research Institute of Materials Science Shanxi Normal UniversityLinfen 041004China Collaborative Innovation Center for Shanxi Advanced Permanent Magnetic Materials and Technology Linfen 041004China

Two-dimensional(2 D)few-layerVSe_(2),V_(1-x)Fe_(x)Se_(2) nanosheets have been synthesized by a hightemperature organic solution-phase method. The thickness of VSe_(2) nanosheets can be tuned from 12 to 5 layers by decreasing the precursor concentrations. The few-layer VSe_(2) nanosheets show the room-temperature ferromagnetism. The coercivity and magnetization reach 0.024 T and 0.036 mA·m^(2)·g^(-1) at room temperature. The chargedensity wave behavior is also confirmed in VSe_(2) by the hysteresis loops and zero-field-cooling curve. V_(1-x)Fe_(x)Se_(2) nanosheets can be obtained by doping Fe(acac)3 in the reaction process. The room-temperature coercivity and magnetization of V_(0.8)Fe_(0.2)Se_(2) nanosheets are 5 times higher than those of the pure VSe_(2) nanosheets without destroying the structures. The enhancement of magnetization is due to the coupling interaction of 3 d orbits between V and Fe atoms. Higher Fe concentration is beneficial to improve the coercivity, which is attributed to the formation of the second phase Fe3 Se4. This simple chemical preparation method can be extended to prepare the other 2 D materials.

关键词： VSe2 Fe doping Two-dimensional nanosheets Room-temperature ferromagnetism Chemical method

Functional response, host stage preference and interference of two whitefly parasitoids

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Insect Science 2016年第1期23卷 134-144页

作者： Hai-Yun Xu Nian-wan Yang Min Duan fang-Hao wan State Key Laboratory for Biology of Plant Diseases and Insect Pests Institute of Plant Protection Chinese Academy of Agricultural Sciences Beijing Agricultural Genome Institute at Shenzhen Chinese Academy of Agricultural Sciences Shenzhen Qingdao Agricultural University Qingdao Shandong Province China

The functional responses of two parasitoids, Eretmocerus hayati Zolnerowich ＆ Rose and Encarsia sophia Girault ＆ Dodd, of whitefly Bemisia tabaci Gennadius Middle East-Asia Minor 1 were studied under laboratory conditions. In addition, the influence of host density and host stage on the competitive interactions between the two parasitoids, and biological control effect on whitefly were evaluated. In the functional response study, adult parasitoids were tested individually, with a conspecific or heterospecific competitor. Both Er. hayati and En. sophia exhibited a type II response to increasing host density, whether a conspecific or heterospecific competitor was present or not. Difference of searching rates and handling times between treatments suggested interference interactions existed between two parasitoid species. In the host stage preference study, two parasitoid species were jointly tested. Er. hayati had a competitive advantage over En. sophia when provided young host instars （first and second instar）, whereas no advantage was found on old host instars （third and fourth instar）. The biological control effect ofEr hayati and En. sophia in different introductions varied with host density. However, the effect of host instar on host mortality was not significant. These findings provide information for the practice of biological control and give better insight into how parasitoid species may coexist in diverse environments.

关键词： Bemisia tabaci Encarsia sophia Eretmocerus hayati functional response interspecific competition

Adsorption of Zinc and Cyanide from Cyanide Effluents on Anionic Ion-exchange Resin

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Chemical Research in Chinese Universities 2013年第1期29卷 144-149页

作者： ZHANG Ya-li fang Tao YU xian-jin School of Chemical Engineering Shandong University of Technology Zibo 255081 P. R. China

The adsorption of zinc and cyanide from cyanide effluents onto strong and weak basic anion exchange re sins was studied in a batch adsorption system. Factors influencing the adsorption rates such as resin selection, resin amounts, contact time and temperature were studied and scanning electron microscopyenergy disperse spectrosco py（SEMEDS） was used in the analysis. The present study shows that the adsorption capacity of resin 201 x7 is better than that of resin 301. The adsorption process was relatively fast and came to equilibrium after 60 min. The kinetic data were analyzed with three models and the pseudosecondorder kinetic model was found to agree with the expe rimental data well. The equilibrium data could also be described well by Langmuir isotherm model. Thermodynamic parameters such as enthalpy change（AH0）, free energy change（AG0） and entropy change（AS0） were calculated and the adsorption process was spontaneous and endothermic.

关键词： Ion-exchange Adsorption Adsorption isotherm Adsorption kinetics Thermodynamic parameter

Changes in Soil Biota Resulting from Growth of the Invasive Weed, Ambrosia artemisiifolia L.(Compositae), Enhance Its Success and Reduce Growth of Co-Occurring Plants

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Journal of Integrative Agriculture 2014年第9期13卷 1962-1971页

作者： LI Hui-na XIAO Bo LIU wan-xue wan fang-hao State Key Laboratory for Biology of Plant Diseases and Insect Pests Institute of Plant Protection Chinese Academy of Agricultural Sciences

Exotic plant invasion presents a serious threat to native ecosystem structure and function. Little is known about the role of soil microbial communities in facilitating or resisting the spread of invasive plants into native communities. The purpose of this research is to understand how the invasive annual plant Ambrosia artemisiifolia L. facilitates its competition capacity through changing the structure and function of soil microbial communities. The soil characteristics of different areas invaded by A. artemisiifolia were examined. Greenhouse experiments were designed to assess the effect of A. artemisiifolia invasion-induced changes of soil biota on co-occurring plant growth, and on the interactions between A. artemisiifolia and three co-occurring plant species. The results showed that the soil organic C content was the highest in heavily invaded sites, the lowest in native plant sites, and intermediate in newly invaded sites. Soil available N, P and K concentrations in heavily invaded site were 2.4, 1.9 and 1.7 times higher than those in native plant soil, respectively. Soil pH decreased as A. artemisiifolia invasion intensity increased, and was lower in invaded sites（heavily invaded and newly invaded） than in native plant sites. The soil microbial community structure was clearly separated in the three types of sites, and A. artemisiifolia invasion increased anaerobe, sulfate-reducing bacteria and actinomycete abundance. Soil biota of invaded sites inhibits growth of co-occurring plants（Galinsoga parvifloraCav., Medicago sativa L. and Setaria plicata（Lam.） T. Cooke.） compared to soil biota from un-invaded sites, but facilitates A. artemisiifolia growth and competition with co-occurring plants. A. artemisiifolia biomass was 50-130% greater when competing with three co-occurring plants, compared to single-species competition only（invasion by A. artemisiifolia alone）, in heavily invaded soil. Results of the present study indicated that A. artemisiifolia invasion al

关键词： biological invasion invasive alien plant Ambrosia artemisiifolia L. soil biota soil fertility

The extended auxiliary the KdV equation with equation method for variable coefficients

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Chinese Physics B 2011年第10期20卷 166-170页

作者： Shi Lan-fang Chen Cai-Sheng Zhou xian-Chun College of Mathematics Hohai University Nanjing 210098 China College of Mathematics and Physics Nanjing University of Information Science and Technology Nanjing 210044 China College of Electronic and Information Engineering Nanjing University of Information Science and Technology Nanjing 210044 Chins

This paper applies an extended auxiliary equation method to obtain exact solutions of the KdV equation with variable coefficients. As a result, solitary wave solutions, trigonometric function solutions, rational function solutions, Jacobi elliptic doubly periodic wave solutions, and nonsymmetrical kink solution are obtained. It is shown that the extended auxiliary equation method, with the help of a computer symbolic computation system, is reliable and effective in finding exact solutions of variable coefficient nonlinear evolution equations in mathematical physics.

关键词： extended auxiliary equation method KdV equation with variable coefficients exactsolutions

Second Approximation Model for Optical Head in Super High Density Storage Technology

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Wuhan University Journal of Natural Sciences 2000年第2期5卷 155-158页

作者： Wu wan Pei xian-deng College of Computer Science and Technology Huazhong University of Science and Technology Wuhan China

The paper presents second approximation model for optical head in super high-density storage technology firstly and it is an important part for three grades approximate model of ultra-small-size quantum well corn-shaped laser and simulative calculations. It supplies the important and useful results for the NFOD optical head design with ultra thin active layer and ultra small spot laser.

关键词： near field optical disc corn-shaped laser multilayer quantum well mode analysis