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Navigating the safe operation of high-voltage cathodes:Challenges and strategies

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Nano Research 2024年第10期17卷 8694-8705页

作者： Yue sun changjian Zuo Yi-Chun Lu Electrochemical Energy and Interfaces Laboratory Department of Mechanical and Automation EngineeringThe Chinese University of Hong KongHong Kong 999077China

Lithium-ion batteries play a crucial role in storing energy for renewable sources and electric vehicles,yet face challenges related to insufficient energy *** the working-voltage of cathodes is promising to boost the energy density of batteries by increasing both the output voltage and capacity of cathode,which however could compromise life cycle and *** review provides a comprehensive summary of essential factors governing pathways of cathode-induced thermal runaway,including electrolyte decomposition,phase transitions,and crosstalk-induced *** and electrolyte modifications aimed at mitigating parasitic reactions and preventing crosstalk were also *** review concludes with insights into the future application of these strategies,providing a comprehensive perspective on the realization of high-energy and safe batteries.

关键词： battery safety high-voltage cathode lithium-ion battery thermal runaway

Microstructure evolution of an Mg-Zn-Nd-Zr magnesium alloy during recrystallization and partial remelting process

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China Foundry 2013年第4期10卷 244-247页

作者： Tao Jianquan Wan Yuanyuan sun changjian Su Zhiquan Deng Tianquan Huang Jing No.59 Institute of China Ordnance Industry

To obtain a spheroidal microstructure of a semi-solid Mg-Zn-Nd-Zr alloy,which is favorable for the subsequent thixocasting process,the recrystallization and partial remelting(RAP)method was used in this study,and the microstructure evolution of the alloy and the mechanism of the shape factor change during the RAP process were *** as-cast Mg-Zn-Nd-Zr alloy was prepared in a metal mold and then extruded into bars with an extrusion ratio of 16:*** remelting was carried out on the extruded samples at 589℃(at a heating rate of 0.5℃·s-1)for different holding times ranging from 0 to 90 *** examine the effect of heating rate,partial remelting of samples at the heating rate of 2℃·s-1was also *** show that the extruded microstructure rapidly evolutes into recrystallized grains in the semi-solid state;the liquid f ilm initially forms at grain boundaries during the partial remelting,and then gradually changes from continuous into discontinuous state with the increase of holding time;this results in the agglomeration of adjacent grains and the decrease in shape *** value of shape factor increases continuously with holding time at f irst and reaches the maximum 0.62 when holding for 60 min,while decreases rapidly after a prolonged holding ***,local melting,mainly due to the inhomogeneous deformation during extrusion,becomes more signif icant and less uniformly distributed at a relatively higher reheating *** Mg-Zn-Nd-Zr magnesium alloy components have been thixo-cast successfully using the RAP method,which strongly proves the feasibility of RAP process in Mg-Zn-Nd-Zr alloy.

关键词： semi-solid microstructure extrusion partial remelting magnesium alloy

Rapid and stable calcium-looping solar thermochemical energy storage via co-doping binary sulfate and Al±Mn±Fe oxides

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Green Energy & Environment 2024年第8期9卷 1290-1305页

作者： changjian Yuan Xianglei Liu Xinrui Wang Chao Song Hangbin Zheng Cheng Tian Ke Gao Nan sun Zhixing Jiang Yimin Xuan Yulong Ding School of Energy and Power Engineering Nanjing University of Aeronautics and Astronautics Key Laboratory of Thermal Management and Energy Utilization of Aviation Vehicles Ministry of Industry and Information Technology Birmingham Centre for Energy Storage School of Chemical Engineering University of Birmingham

Solar thermochemical energy storage based on calcium looping（CaL） process is a promising technology for next-generation concentrated solar power（CSP） systems. However, conventional calcium carbonate（CaCO3） pellets suffer from slow reaction kinetics, poor stability, and low solar absorptance. Here, we successfully realized high power density and highly stable solar thermochemical energy storage/release by synergistically accelerating energy storage/release via binary sulfate and promoting cycle stability, mechanical strength, and solar absorptance via Al±Mn±Fe oxides. The energy storage density of proposed CaCO3pellets is still as high as 1455 kJ kg-1with only a slight decay rate of 4.91% over 100 cycles, which is higher than that of state-of-the-art pellets in the literature, in stark contrast to 69.9% of pure CaCO3pellets over 35cycles. Compared with pure CaCO3, the energy storage power density or decomposition rate is improved by 120% due to lower activation energy and promotion of Ca2+diffusion by binary sulfate. The energy release or carbonation rate rises by 10% because of high O2-transport ability of molten binary sulfate. Benefiting from fast energy storage/release rate and high solar absorptance, thermochemical energy storage efficiency is enhanced by more than 50% under direct solar irradiation. This work paves the way for application of direct solar thermochemical energy storage techniques via achieving fast energy storage/release rate, high energy density, good cyclic stability, and high solar absorptance simultaneously.

关键词： Calcium looping (CaL) Solar thermochemical Energy storage Binary sulfate Fast reaction kinetics

基于K-均值聚类和传统递归最小二乘法的高光谱图像无损压缩

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电子与信息学报 2016年第11期38卷 2709-2714页

作者：高放孙长建邵庆龙郭树旭吉林大学电子科学与工程学院长春130012

针对基于预测的高光谱图像无损压缩算法压缩比低的问题,该文将聚类算法与高光谱图像预测压缩算法相结合,提出一种基于K-均值聚类和传统递归最小二乘法的高光谱图像无损压缩算法。首先,对高光谱图像按光谱矢量进行K-均值聚类以提升同类... 详细信息

针对基于预测的高光谱图像无损压缩算法压缩比低的问题,该文将聚类算法与高光谱图像预测压缩算法相结合,提出一种基于K-均值聚类和传统递归最小二乘法的高光谱图像无损压缩算法。首先,对高光谱图像按光谱矢量进行K-均值聚类以提升同类光谱矢量间的相似度。然后,对每一聚类群分别使用传统递归最小二乘法进行预测,消除高光谱图像的空间冗余和谱间冗余。最后,对预测误差图像进行算术编码,完成高光谱图像压缩过程。对AVIRIS 2006高光谱数据进行仿真实验,所提算法对16位校正图像、16位未校正图像和12位未校正图像分别取得了4.63倍,2.82倍和4.77倍的压缩比,优于同类型已报道的各种算法。

关键词：高光谱图像图像压缩递归最小二乘法聚类

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真空增压铸造技术及其应用前景

特种铸造及有色合金 2003年第5期23卷 38-40页

作者：苏志权孟照亮孙昌建中国兵器工业第五九研究所

详细论述了真空增压铸造的技术原理、工艺特性及技术优点。结合铝合金铸件大型、复杂、薄壁、整体化和高气密性的发展趋势 ,针对性地分析了真空增压铸造技术推广应用的适应性 ,并提出了相应的技术对策。

关键词：真空浇注压力结晶铝合金铸件真空增压铸造

Divergent responses of runoff to climate change in the upper basins of the Third Pole dominated by westerlies and monsoon

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Science China Earth Sciences 2024年第8期67卷 2592-2614页

作者： Qikai sun Fengge SU He sun State Key Laboratory of Tibetan Plateau Earth System Environment and Resources(TPESER)Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100101China

The diverse climates,distribution of snow and glaciers,and geographic locations directly affect the runoff response to climate change in the upper basins of the Third *** present,a comprehensive analysis of runoff variations and their distinct responses to climate change in the westerlies-and monsoon-dominated upper basins is still *** study comprehensively analyzed annual runoff variations in westerlies-dominated basins(the upper basins of the Aksu(UAKS),Syr Darya(USRD),Yarkant(UYK),Hotan(UHT),Amu Darya(UAMD),and Indus(UI))and monsoon-dominated basins(the upper basins of the Yangtze(UYA),Yellow(UYE),Lancang(ULC),Nujiang(UNJ),and Yarlung Zangbo(UYZ))of the Third Pole from 1961 *** multi-source meteorological data and large-scale circulation factors,this study investigated the divergent responses of runoff in the upper basins to climate change,and explored the large-scale circulation mechanisms underlying runoff variations in these upper *** results showed that:(1)The annual runoff in the majority of upper basins(except for the UYE and UYZ)exhibited an increasing trend,and the annual runoff in the UAKS,UYK,and UI showed a significant increasing trend from1961 to *** annual runoff in the upper basins of the Third Pole changed abruptly from decreasing to increasing between the 1980s and 2000s,with the exception of the UYE.(2)The runoff in the monsoon-dominated upper basins has been controlled primarily by changes in precipitation over the past 55 *** contrast,the runoff in the westerlies-dominated upper basins exhibited three distinct long-term responses to climate change:temperature-dominated(UYK and UHT),precipitation-dominated(USRD and UAMD),and the combined influence of precipitation and temperature(UAKS and UI).Since the 1960s,the sensitivity of runoff to warm season temperature changes in the most westerlies-dominated upper basins has decreased,while the response of runoff to precipitation changes has intensified.(3)The stud

关键词： Upper basins of the Third Pole Climate change Westerlies and monsoon Runoff variations Large-scale circulation factors

New perspectives on deep carbon cycling

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Science China Earth Sciences 2024年第8期67卷 2411-2422页

作者： Weidong sun Center of Deep Sea Research Key Laboratory of Ocean Observation and ForecastingInstitute of OceanologyChinese Academy of SciencesQingdao 266071China Laoshan Laboratory Qingdao 266237China University of Chinese Academy of Sciences Beijing 100049China

The proto-atmosphere serves as a crucial starting point for the carbon *** based on atmospheric data from Mars and Venus suggest that Earth's proto-atmosphere contained>110 bar of CO_(2)and>2.6 bar of *** protoatmosphere had over 1000 bar of water vapor during the magma ocean stage,assuming the proto-ocean had a volume of two oceans of *** this stage both water and carbon dioxide were in a supercritical state at the magma-atmosphere *** serpentinization reactions occurred due to rock-water interaction,producing abundant ***,nitrogen is reduced to ammonia,and carbon dioxide to methane,forming carbonate *** proto-atmosphere dominated by methane,ammonia,and hydrogen formed a significant amount of amino acids through *** process is essential not only to the origin of life,but also to the early carbon-nitrogen cycle on *** the Hadean eon,a large amount of CO_(2)was sequestered as carbonate and organic ***,it mainly entered the deep mantle through mantle overturn or *** the mantle transition zone,carbonate undergoes“Redox freezing”,where carbonate is reduced to diamond through oxidation of ferrous iron in the *** the lower mantle,Fe^(2+)undergoes disproportionation reactions,forming Fe^(3+)and metallic *** these,Fe^(3+)mainly resides in bridgmanite,thereby increasing the oxygen fugacity of the lower mantle,while metallic iron falls to the Earth's *** distribution of carbon in the mantle is crucial for deep carbon *** density curves of diamond and mantle peridotite melt intersect at the bottom of the mantle transition zone(about 660 km).This density crossover leads to the accumulation of diamond during the magma ocean *** materials such as subducting slabs enter the lower mantle,compensatory upwelling of lower mantle material *** enters the upper mantle,decomposes,releasing Fe^(3+)ions and oxidizes diamond

关键词： Carbon cycling Proto-atmosphere Amino acids Subduction initiation Passive margin subduction Atmospheric carbon dioxide

每一页都写着'飞鹰'的青春热血——记高建法和他的笕桥抗战纪念馆

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文化交流 2019年第5期 70-73页

作者：孙昌建

高建法,笕桥当地人士,从小就听老人们讲笕桥空军的故事.随着年岁的增长,笕桥情结越发浓厚.几年前,爱收藏的他开始专收跟空军抗战有关的物件,并于2015年创办了民间性质的笕桥抗战纪念馆.

关键词：话剧界出版物

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浙江乡村的另一种可能

文化交流 2022年第4期 31-34页

作者：孙昌建

在高速杭州淳安出口附近看到淡竹二字，就会想起三十多年前的那个毛竹园。很多人对于淳安县千岛湖的认知是由一个个地名和乡名构成的，比如排岭、汾口、威坪、临岐、文昌、姜家等。据说早年的淳安有60多个乡，正如那个碧波万顷的水库是...

在高速杭州淳安出口附近看到淡竹二字，就会想起三十多年前的那个毛竹园。很多人对于淳安县千岛湖的认知是由一个个地名和乡名构成的，比如排岭、汾口、威坪、临岐、文昌、姜家等。据说早年的淳安有60多个乡，正如那个碧波万顷的水库是由无数滴水所汇成，而这一滴或那一滴又是自带记忆的。

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