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Polybenzimidazole functionalized electrolyte with Li-wetting and self-fluorination functionalities for practical Li metal batteries

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InfoMat 2022年第5期4卷 174-186页

作者： Dongjiang Chen Yuanpeng Liu Chuan Xia Yupei Han Qingwei Sun xuchang wang Wei Chen Xian Jian Weiqiang Lv Jianyi Ma Weidong He National Key Laboratory of Science and Technology on Advanced Composites in Special Environments and Center for Composite Materials and StructuresHarbin Institute of TechnologyHarbinChina School of Physics University of Electronic Science and Technology of ChinaChengduChina School of Materials and Energy University of Electronic Science and Technology of ChinaChengduChina Institute of Atomic and Molecular Physics Sichuan UniversityChengduSichuanChina

Rough Li plating,low ionic conductivity,and low thermal stability of conventional electrolytes post-primary challenges for achieving reliable high-capacity rechargeable lithium batteries,for which lithiummetal is frequently proposed as themost promising anode *** low-polarity commercial polypropylene/polyethylene separators fail to support the application of high-energy-density Li anodes due to their rigid physicochemical properties and the high reactivity of Li metal,leading to fatal dendrite formation and vigorous exothermic reaction with ***,we develop a Li-wetting,flame-retardant binary polymer electrolyte by functionalizing poly(vinylidene fluoride)(PVDF)separators with nonflammable polybenzimidazole(PBI)to build safe room-temperature solid-state electrolyte membranes.A dendrite-free LiFePO4 cell with the solid polymer electrolyte(SPE)delivers a discharge capacity of 127 mAh g^(-1) at 25℃ with a capacity retention of 87.5%after 500 cycles at 0.5℃(0.15 mA cm^(-2)).Phase-field simulations and density functional theory calculations demonstrate that the negatively charged benzimidazole chains of PBI own superior affinity to lithium bis(trifluoromethanesulfonyl)imide(LiTFSI),and shares overlapping electron density with Li anode,giving rise to accelerated Li^(+)conduction at room temperature and uniform Li electrodeposition at the electrolyte/Li metal *** SPE is also flame-retardant since heat-resistant polytetrafluoroethylene and a dense,heat-blocking graphitized carbon layer are formed in intense heat throughdehydrogenation/fluorination of PVDF under the catalysis of Lewis base imidazole rings and the decomposition of benzimidazole rings in *** such fire-resistant mechanism is ever reported in conventional electrolytes.

关键词： flame-retardant properties Li metal polybenzimidazole solid polymer electrolyte uniform Li deposition

Discovery of Enclaves from Cenozoic PuluVolcanic Rocks in West Kunlun Mountains and ItsGeological Implications

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Journal of China University of Geosciences 2002年第1期13卷 30-34页

作者： Zhang Zhaochong Xiao xuchang wang Jun wang YongInstitute of Geology , Chinese Academy of Geological Sciences, Beijing 100037 Institute of Geology Chinese Academy of Geological Sciences Beijing 100037

In this paper, we present the occurrence and mineral components of the enclaves firstly discovered in the Cenozoic Pulu volcanic rocks in west Kunlun Mountains, and propose that the enclave is accumulated by fractional crystallization within high-level magma chamber. In addition, the chemical compositions of its primary magma are calculated. The calculated compositions are similar to those of the Kangxiwa volcanic rocks that belong to the same volcanic belt in the Pulu volcanic region, suggesting their origin from the same source region. However, the temperatures and oxygen fugacity of magmas at high-level magma chamber decreased along with fractional crystallization.

关键词： enclave fractional crystallization volcanic rocks West Kunlun Mountains.

Polycrystalline ZSM-5 Aggregates Induced by Seed and Catalytic Performance in Methanol to Hydrocarbon

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无机材料学报 2024年第8期39卷 945-954,I0010-I0013页

作者： wang xuchang JIAO Chuyu JI Zhuo JIAO Qirui QIN Bo DU Yanze ZHENG Jiajun LI Ruifeng Key Laboratory of Coal Science and Technology MOE Research Centre of Energy Chemical&Catalytic TechnologyTaiyuan University of TechnologyTaiyuan 030024China SINOPEC Dalian Research Institute of Petroleum and Petrochemicals Co. Ltd.SINOPECDalian 116045China

Synthesis of ZSM-5 zeolite typically utilizes small molecule polyamines or quaternary ammonium salts as organic structure guiding agent(OSDA).By contrast,the OSDA-free hydrothermal synthesis system eliminates the use of organic templates and the subsequent calcination *** not only reduces the cost of synthesis,but also prevents environmental pollution from the combustion of organic templates,representing an eco-friendly *** this,literature suggests that even so-called template-free synthesis systems often involve trace amount of organic substances like *** the present work,a calcined commercial ZSM-5 zeolite was served as seed,with sodium aluminate as aluminum source and silica sol as silicon source,ensuring an entirely template-free synthesis *** ZSM-5 aggregates consisted of rod-like nanocrystals were successfully prepared in the completely OSDA-free *** of the Si/Al ratio in ZSM-5 seed,dosage and crystallization conditions such as crystallization temperature and crystallization time on ZSM-5 synthesis were *** results show that a highly crystallinity ZSM-5 aggregate consisting of primary nano-sized crystals less than 100 nm is produced from a gel precursor with 5.6%(in mass)seed after hydrothermal treatment for 48 ***,the Si/Al ratio in ZSM-5 seed has little effect on the topological structure and pore structure of the synthesized ***,the seeds with a low Si/Al ratio facilitate faster crystallization of zeolite and enhance the acidity,especially the strong acid centers,of the *** catalytic performance of the synthesized polycrystalline ZSM-5 was evaluated during dehydration of methanol and compared with a commercial reference *** results exhibit that as compared with the reference catalyst,the fabricated sample has a longer catalytic lifetime(16 h vs 8 h)attributed to its hierarchical pores derived from the loosely packed primary ***

关键词： ZSM-5 polycrystalline aggregate crystal seed structure guiding agent

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下一代制冷剂——历史回顾、思考与展望

暖通空调 2009年第2期39卷 41-49页

作者：康杰士汪训昌 Engineering Consultant 中国建筑科学研究院

回顾了制冷剂从早期使用至现在的进步历程,探讨了未来方向与一些候选制冷剂。根据所定义的选择标准把此历程划分为四代制冷剂。逐一用这些标准讨论了较早工质的替代,并说明了某些早期制冷剂例如那些现在所称的"天然制冷剂"重新受到关注... 详细信息

回顾了制冷剂从早期使用至现在的进步历程,探讨了未来方向与一些候选制冷剂。根据所定义的选择标准把此历程划分为四代制冷剂。逐一用这些标准讨论了较早工质的替代,并说明了某些早期制冷剂例如那些现在所称的"天然制冷剂"重新受到关注的过程。考察了对现有国际协定相关方案的展望,其中包括了分别为防止平流层臭氧耗损与全球气候变化的蒙特利尔与京都议定书的分析。还考察了其他环境问题和更长远的国际与地区性的控制措施。这种讨论说明,如果仅仅孤立地看待各个环境问题,而不是把若干环境问题作为整体而采取综合协调的对策,可能会对环境造成无意识的破坏,这种环境破坏几乎肯定将来还需要再采取挽回措施。可以确定,一些即将出台的政策与管制条例的变化可能对下一代制冷剂的选择会有重要影响。

关键词：制冷剂发展环境气候温室效应臭氧耗损潜能值全球变暖潜能值

TECTONIC EVOLUTION OF THE WESTERN KUNLUN AND KARAKORAM MOUNTAINS—SOME NEW OBSERVATIONS FROM A MULTI-DISCIPLINARY GEOSCIENTIFIC TRANSECT (MGT) IN NW TIBET

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地学前缘 2000年第S1期7卷 83-83页

作者： Xiao xuchang, Liu Xun, wang Jun(Institute of Geology, CAGS, Beijing 100037, China)

New results from deep seismic sounding reveal that the Tarim block (basin) was subducted, with gently dipping, to the *** Mts. The depths of Moho from north to south are 50km in *** to 65km in the W. Kunlun Mts. A low velocity and low resistivity layer occurs at the depth of 15～30km, which may be the decollement in the upper crust. A “delamination Crack" might have been formed in the lower crust\|mantle lid, causing the intrusion of alkaline magma along the southern margin of the W. Kunlun Mts. A detailed research for forming and evolving of the Kudi ophiolite in the central part of the W. Kunlun Mts.,which has been given the age of 700～450Ma by using the Re\|Os isotopic dating, and the Radiolarits in chert intercalated with pillow lava are determined to be the late Ordovician to Silurian. Until now we did not find any complete ophiolite suite except Kudi ophiolite. So we suggest that there was no “vast protero\|ocean", and a “limited oceanic basin" exists only during the late Proterozoic to Early Paleozoic, which might have been subducted in Silurian\|Devonian and formed the oldest suture in the north of the Tibet plateau.A suture zone consisting of H. P/T metamorphic blueschist, ophiolitic melange and olistostrome in the north\|western Tibet has been revealed recently, which may extend to NW. connecting with MKT in N. Pakistan.A study of the Fission track thermochronology indicates that the *** Mts. has been undergone a pulsatory uplift since 20～18Ma,and a rapid uplift after 3Ma.A model of collision between the Indo\|Pakistan subcontinent\|*** and the Eurasian blocks of Tarim has been illustrated.

关键词： Western Kunlun and Karakoram Mts deep seismic sounding tectonic evolution

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DIS和HLA系统中的记录与回放

计算机仿真 2000年第1期17卷 57-59页

作者：张桂元王旭昌王精业装甲兵工程学院仿真室 100072

记录和回放在军用仿真系统中有着重要的意义 ,该文具体分析了DIS和HLA系统中记录与回放的基本实现方法 ,并从两个方面比较了两种系统中实现上的不同点。

关键词：分布式交互仿真 HLA系统仿真系统军事

An early aged ophiolite in the Western Kunlun Mountain, northwestern Tibet plateau and its tectonic implications

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An early aged ophiolite in the Western Kunlun Mountain, nort...

2004年全国岩石学与地球动力学研讨会

作者： xuchang XIAO Jun wang Wenhua Ji Li Su 1. Institute of Geology, Chinese Academy of Geological Sciences (CAGS) 2. Regional Geological Surveying Party of Shanxi Provence 3. Xi''An Institute of Geology and Mineral Resources

＜正＞ The early aged ophiolites have attracted the studying from many geologists in recent decades （Colombo C. G. et al, 2001, Scarrow J. H. et al., Timothy M. Kusky et al., 2001.....）, because the early aged ophiolites can provide the information about the ancient oceanic processes relevant to the evolution of the plate tectonics in the early period of the earth, and also concem such problems as whether there existed a "Protero-Tethys" and the break-up and convergence of the Rodinia Supercontinent in the NW Tibet plateau. This paper reveals a definite complete ophiolite, the "Kudi- ophiolite" of late-Proterozoic-early Paleozoic, in the Westem Kunlun Mtns, NW. Tibet plateau, and reports the recent isotopic ages of 510±4Ma. And 502±13Ma （U-Pb ratio in zircon） for the middle and upper portions of the mafic cumulates of the Kudi-ophiolite, operated at the most powerful dating tool, the SHRIMP-Ⅱ. The geochemical and geochronological data integrating with the geological setting suggest that the Kudi-ophiolite might have formed in an Archipelago not in a vast oceanic basin, the so-called Protero-Tethys, and was tectonically emplaced during the early Paleozoic in the NW. Tibet plateau.

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L/S频段一体化高集成SiP模块设计

固体电子学研究与进展 2024年第5期44卷 461-467页

作者：刘为勇熊锦康王旭昌许冰黄勇余蒋平苏州博海创业微系统有限公司江苏苏州215163

为解决系统小型化、轻量化的设计需求,设计了一款支持北斗RNSS、RDSS一体化SiP收发模块,工作频段支持北斗B3/L/S三频点。该SiP模块采用一体化陶瓷封装架构,通过异质异构集成方式集成了多种射频无源器件和数模芯片。采用金属腔体屏蔽与... 详细信息

为解决系统小型化、轻量化的设计需求,设计了一款支持北斗RNSS、RDSS一体化SiP收发模块,工作频段支持北斗B3/L/S三频点。该SiP模块采用一体化陶瓷封装架构,通过异质异构集成方式集成了多种射频无源器件和数模芯片。采用金属腔体屏蔽与多排交叉金属通孔结构实现了隔离屏蔽,并对滤波器、多工器、巴伦以及传输结构等无源器件进行了仿真设计,最终实现尺寸为24.0 mm×24.0 mm×4.3 mm,性能良好。文中介绍了SiP收发模块的工作原理、关键技术以及最终实现形式,设计结果满足定位及导航终端等相关应用需求。

关键词： SiP收发模块异质异构集成一体化定位/导航终端

基于正交试验的淬硬模具钢球头铣削加工表面粗糙度研究

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工具技术 2018年第7期52卷 27-30页

作者：王绪昌周咏辉赵军山东大学高效洁净机械制造教育部重点实验室机械工程国家级实验教学示范中心

采用正交试验法研究整体硬质合金球头铣刀铣削加工淬硬模具钢Cr12Mo V时切削参数对零件加工表面粗糙度的影响。设计了以主轴转速、每齿进给量、径向切深、侧偏角和前倾角为主要因素的5水平5因素正交试验,通过极差分析和方差分析方法研... 详细信息

采用正交试验法研究整体硬质合金球头铣刀铣削加工淬硬模具钢Cr12Mo V时切削参数对零件加工表面粗糙度的影响。设计了以主轴转速、每齿进给量、径向切深、侧偏角和前倾角为主要因素的5水平5因素正交试验,通过极差分析和方差分析方法研究了切削参数对表面粗糙度的影响规律,明确了主要影响因素。结果表明:表面粗糙度随每齿进给量和径向切深的增大而增大,随主轴转速的增大而减小,随侧偏角和前倾角的增大呈现出先减小后增大的趋势,各因素的影响程度从大到小依次为每齿进给量、径向切深、主轴转速、侧偏角、前倾角。

关键词：正交试验淬硬模具钢加工参数表面粗糙度