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Edge-functionalized acetylene black anchoring sulfur for high-performance Li–S batteries

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Journal of Energy Chemistry 2017年第3期26卷 448-453页

作者： Wei Qin songtao lu Zhida Wang Xiaohong Wu School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001HeilongjiangChina School of Chemistry and Chemical Engineering Harbin Institute of TechnologyHarbin 150001HeilongjiangChina

To date, most of the research on electrodes for lithium sulfur batteries has been focused on the nanostructured sulfur cathodes and achieves significant success. However, from the viewpoint of manufacturers, the nanostructured sulfur cathodes are not so promising, because of the low volumetric energy density and high cost. In this work, we obtained the low-cost, scalable, eco-friendly mass production of edge-functionalized acetylene black-sulfur(FAB-S) composites by high-energy ball-milling technique for lithium sulfur batteries. The as-prepared FAB-S composite can deliver a high initial discharge capacity of 1304 mAh/g and still remain a reversible capacity of 814 mAh/g after 200 cycles at a charge-discharge rate of 0.2 C in the voltage range of 1.7–2.7 V. The observed excellent electrochemical properties demonstrate that the cathodes obtained by the facile high-energy ball-milling method as the cathode for rechargeable Li-S batteries are of great potential because it used the sole conductive additive acetylene black(AB).Such improved properties could be attributed to the partially exfoliation of AB, which not only keeps the AB’s inherent advantage, but also increases the specific surface area and forms chemical bonds between carbon and sulfur, resulting in the accumulation of the polysulfides intermediate through both the physical and chemical routes.

关键词： Sulfur cathode Lithium–sulfur batteries Acetylene black Edge-functionalized High-energy ball-milling

Multiple hypothesis tracking based on the Shiryayev sequential probability ratio test

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Science China Earth Sciences 2016年第12期59卷 86-96页

作者： Jinbin FU Jinping SUN songtao lu Yingjing ZHANG School of Electronic and Information Engineering Beihang University Department of Electrical and Computer Engineering Iowa State University

To date, Wald sequential probability ratio test(WSPRT) has been widely applied to track management of multiple hypothesis tracking(MHT). But in a real situation, if the false alarm spatial density is much larger than the new target spatial density, the original track score will be very close to the deletion threshold of the WSPRT. Consequently, all tracks, including target tracks, may easily be deleted, which means that the tracking performance is sensitive to the tracking environment. Meanwhile, if a target exists for a long time, its track will have a high score, which will make the track survive for a long time even after the target has disappeared. In this paper, to consider the relationship between the hypotheses of the test, we adopt the Shiryayev SPRT(SSPRT) for track management in MHT. By introducing a hypothesis transition probability, the original track score can increase faster, which solves the first problem. In addition, by setting an independent SSPRT for track deletion, the track score can decrease faster, which solves the second problem. The simulation results show that the proposed SSPRT-based MHT can achieve better tracking performance than MHT based on the WSPRT under a high false alarm spatial density.

关键词： multiple target tracking multiple hypothesis tracking Shiryayev sequential probability ratio test track management track score

Factor graph aided multiple hypothesis tracking

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Science China(Information Sciences) 2013年第10期56卷 284-289页

作者： WANG Huan SUN JinPing lu songtao WEI ShaoMing School of Electronic and Information Engineering Beihang University Department of Electrical and Computer Engineering Iowa State University

Since closely moving targets exist extensively in the ground moving target tracking,the uncertainty of data association greatly increases making the measurement-to-track association more ***,traditional multiple hypothesis tracking(MHT)has high false tracking rate and track *** paper frst investigates the measurement based factor graph in data association,and gives the corresponding message passing ***,a factor graph aided multiple hypothesis tracking(FGA-MHT)method is proposed,which introduces factor graph based m-best hypothesis producing technique and exploits factor graph based probability refnement algorithm to reduce the uncertainty of measurement-to-track *** results demonstrate that FGA-MHT reduces times of track swap and increases the correct data association rate in closely moving target tracking.

关键词： multiple hypothesis tracking(MHT) data association factor graph message passing algorithm sum-product algorithm factor graph aided multiple hypothesis tracking(FGA-MHT

High rate and cycling stable Li metal anodes enabled with aluminum-zinc oxides modified copper foam

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Journal of Energy Chemistry 2020年第2期29卷 87-92页

作者： songtao lu Zhida Wang He Yan Rui Wang Ke lu Yingwen Cheng Wei Qin Xiaohong Wu MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001HeilongjiangChina School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001HeilongjiangChina Department of Chemistry and Biochemistry Northern Illinois UniversityDekalb 60115ILUnited States

Metallic Li is a promising anode material for high energy density batteries but it suffers from poor stability and formation of unsafe dendrites. Previous studies demonstrated that 3 D metal foams are able to improve the stability of Li metal but the properties of these foams are inherently limited. Here we report a facile surface modification approach via magnetron sputtering of mixed oxides that effectively modulate the properties of Cu foams for supporting Li metal with remarkable stability. We discovered that hybrid Li anodes with Li metal thermally infused to aluminum-zinc oxides(AZO) coated Cu foams have significantly improved stability and reactivity compared with pristine Li foils and Li infused to unmodified Cu foams. Full cells assembled with a Li Fe PO4 cathode and a hybrid anode maintained low and stable charge-transfer resistance(lume change without the formation of dendrites during battery cycling. The rational construction of surface architecture to precisely control Li plating and stripping may have great implications for the practical applications of Li metal batteries.

关键词： Composite Lianode Metal foams Surface modification Limetal batteries 3D current collector

Atomic Manganese Manipulating Polysulfide Speciation Pathway for Room-Temperature Na-S Batteries

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CCS Chemistry 2024年第9期6卷 2289-2304页

作者： Hong Zhang Mingli Wang Xiang-Long Huang songtao lu Ke lu Xiaohong Wu School of Chemistry and Chemical Engineering Harbin Institute of TechnologyHarbinHeilongjiang 150001 Institutes of Physical Science and Information Technology Anhui UniversityHefeiAnhui 230601 Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054

Sluggish polysulfide redox kinetics,especially the high energy barrier of rate-determining short-chain polysulfide conversion and the high activation barrier of Na_(2)S decomposition during sulfur recovery,compromise the full potential of rechargeable Na-S *** we construct the hierarchical sandwich-structured carbon matrix with atomically dispersed Mn-N4 Lewis acidic sites,taking advantage of their bidirectional electrocatalytic behavior toward interface-mediated reversible sulfur *** and theoretical results reveal that the spatial confinement and catalytic effects facilitated via strong Lewis acid-base electron interactions synergistically manipulate the low kinetically direct Na_(2)S_(4) to Na_(2)S conversion,and the formation of Mn-S bond minimizes the energy barrier of Na_(2)S electrochemical activation during battery recharging,thereby rendering a reversible and tunable polysulfide speciation ***,the degradation of the Na-S cell is due to the depletion of metal anode rather than the loss of active sulfur species and/or aggregation of inactive dead *** expected,the S@Mn/NC cathode delivers outstanding rate capability and ultrahigh cycling ***,a proof-of-concept pouch cell was also demonstrated capable of delivering an energy density up to 840 Wh kgcathode−*** tunable sulfur redox electrochemistry invoked by the bidirectional monodispersed Mn catalytic hot spots facilitates the efficient polysulfide speciation for practical Na-S cells.

关键词： single-atom manganese catalysts polysulfide manipulation reaction kinetics bidirectional catalysts sodium-sulfur batteries

Rhodamine 6G-based Chemosensor for the Visual Detection of Cu2＋ and Fluorescent Detection of Hg2＋ in Water

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Chemical Research in Chinese Universities 2014年第1期30卷 32-36页

作者： HE Song LIU Qiuchen LI Yuanyuan WEI Fangfang CAI songtao lu Yan ZENG Xianshun Key Laboratory of Display Materials & Photoelectric Devices Ministry of EducationSchool of Materials Science & Engineering Tianjin University of Technology Tianjin 300384 P R. China

A novel water soluble chemosensor 1 based on rhodamine 6G spirolactam scaffold has been synthesized and *** addition of a wide range of the environmentally and biologically relevant metal ions,chemosensor 1 shows a colorimetric selective Cu2＋ recognition from colorless to pink confirmed by UV-Vis absorption spectral changes,while it also exhibits a fluorometric selective Hg2＋ recognition by fluorescence *** absorption enhancement factor over 17-fold with 1-Cu2＋ complex and a fluorescent enhancement factor over 45-fold with 1-Hg2＋ complex were *** recognition mechanisms were assumed to be a 1：1 stoichiometry for 1-Cu2＋ complex and a 1：2 stoichiometry for 1-Hg2＋ complex,respectively,which were proposed to be different ligation leading to the ring-opening of rhodarnine 6G ***,the detection limits for CU2＋ or Hg2＋ were 3.3 × 10-8 or 1.7x 10-7 mol/L,respectively.

关键词： Rhodamine 6G Chemosensor Cu2+ Hg2+

Design of graph computing accelerator based on reconfigurable PE array

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The Journal of China Universities of Posts and Telecommunications 2024年第5期31卷 49-63,70页

作者： Deng Junyong Jia Yanting Zhang Baoxiang Kang Yuchun lu songtao School of Electronic Engineering Xi'an University of Posts and TelecommunicationsXi'an 710121China

Due to the diversity of graph computing applications, the power-law distribution of graph data, and the high compute-to-memory ratio, traditional architectures face significant challenges regarding poor flexibility, imbalanced workload distribution, and inefficient memory access when executing graph computing tasks. Graph computing accelerator, GraphApp, based on a reconfigurable processing element(PE) array was proposed to address the challenges above. GraphApp utilizes 16 reconfigurable PEs for parallel computation and employs tiled data. By reasonably dividing the data into tiles, load balancing is achieved and the overall efficiency of parallel computation is enhanced. Additionally, it preprocesses graph data using the compressed sparse columns independently(CSCI) data compression format to alleviate the issue of low memory access efficiency caused by the high memory access-to-computation ratio. Lastly, GraphApp is evaluated using triangle counting(TC) and depth-first search(DFS) algorithms. Performance analysis is conducted by measuring the execution time of these algorithms in GraphApp against existing typical graph frameworks, Ligra, and GraphBIG, using six datasets from the Stanford Network Analysis Project(SNAP) database. The results show that GraphApp achieves a maximum performance improvement of 30.86% compared to Ligra and 20.43% compared to GraphBIG when processing the same datasets.

关键词： graph computing reconfigurable accelerator parallel computing triangle counting(TC)algorithm depth-first search(DFS)algorithm

Malignant transformation of craniopharyngioma in an infradiaphragmatic case

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Chinese Medical Journal 2014年第17期127卷 3187-3188页

作者： lu Yuntao Qi songtao Peng Junxiang Pan Jun Zhang Xi'an Department of Neurosurgery Nanfang Hospital Southem Medical University Guangzhou Guangdong 510515 China

Till now, 13 cases of malignant craniopharyngioma （CP） have been reported around the world, including 11 cases of transformation from benign tumors and 2 cases of congenital ones. Irradiation seemed to contribute a lot to the cellular transformation. The controversies about the radical surgery or irradiation have not ceased for many decades. In this article, we report a case of infradiaphragmatic CP （Id-CP） in a child who experienced almost all current treatments. However, after multiple tumor recurrences, finally the malignant transformation occurred. The analysis of the tumor regrowth pattem and clinical characteristics provided some clues to standardize and individualize the treatment of Id-CP.

关键词： craniopharyngioma malignant neoplasm diaphragm neurosurgery

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考虑月球升交点黄经的地月低能转移轨道

中国空间科学技术 2009年第4期29卷 13-20,27页

作者：卢松涛赵育善北京航空航天大学宇航学院北京100191

地月转移轨道研究的基本模型主要是限制性二体模型和限制性三体模型。在限制性三体建模下,基于轨道分类理论的地月脉冲变轨比传统的霍曼变轨节省了更多的燃料(至少13%以上)。单独的"地球-月球-飞行器"的限制性三体问题无法应用轨道分类... 详细信息

地月转移轨道研究的基本模型主要是限制性二体模型和限制性三体模型。在限制性三体建模下,基于轨道分类理论的地月脉冲变轨比传统的霍曼变轨节省了更多的燃料(至少13%以上)。单独的"地球-月球-飞行器"的限制性三体问题无法应用轨道分类的理论进行轨道设计,必须加入太阳。文章考虑了月球升交点赤经、黄白交角,以及正确的地月系统稳定流形的方向,整个"太阳-地球-月球-飞行器"系统拆分为"地球-月球-飞行器"的平面圆型限制性三体问题,和"太阳-地球-飞行器"三维圆型限制性三体问题进行分析,并利用Matlab仿真验证了方案的可行性。

关键词：转移轨道计算三体问题升交点黄经月球探索航天器