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Enhancement of–OH content on mechanical properties of antiperovskite solid electrolytes

Nano Research 2024年第7期17卷 6139-6146页

作者： Zunqiu Xiao Huaying Wang Ningyuan Cai Yutong Li Kejia Xiang Wei Wei Tao Ye Zhongtai Zhang Shitong Wang zilong tang State Key Lab of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China College of New Energy Advanced Chemical Engineering and Energy Materials Research CenterChina University of Petroleum(East China)Qingdao 266580China Department of Nuclear Science and Engineering Massachusetts Institute of TechnologyCambridgeMA 02139USA

All-solid-state batteries,renowned for their enhanced safety and high energy density,have garnered broad *** solid electrolytes are highly anticipated for their balanced ***,their high Young’s modulus and inadaptability to volume change during cycling lead to poor contact and eventual battery *** this work,Young’s modulus of Li_(1+x)(OH)_(x)Cl samples is lowered to a level comparable to that of sulfide by regulating the–OH *** the–OH content increases,Young’s modulus of Li_(1+x)(OH)_(x)Cl samples decreases *** may be due to the local aggregation of–OH groups,forming cavities similar to LiOH structure,which reduces the bonding of the *** the premise of high Li-ion conductivity and electrochemical stability,the lowered Young’s modulus improves the contact between the solid electrolyte and the electrodes,forming a strong and stable interfacial layer,thereby improving interfacial and cycling *** symmetrical lithium metal cell shows excellent cycle performance of 600 h,and the assembled LiFePO_(4)|Li_(2.4)(OH)1.4Cl|Li cell shows significantly enhanced cycling endurance with 80%capacity retention after 150 *** work not only emphasizes the crucial importance of Young’s modulus in improving interface issues but also offers innovative approaches to advance the mechanical properties of solid electrolytes.

关键词： mechanical properties -OH content anti-perovskite solid electrolytes Li-ion batteries

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Development and assessment of an onsite large volume solid phase extraction (LV-SPE) device for the determination of pharmaceuticals and personal care products (PPCPs) in water

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Emerging Contaminants 2024年第1期10卷 24-31页

作者： Xue Cheng Ning Fang Yuxi Ge Wenchao Li Yamei Hui zilong tang Yu Wan Yuancheng Li State Key Joint Laboratory of Environmental Simulation and Pollution Control(SKLESPC) Beijing Key Laboratory for Emerging Organic Contaminants Control(BKLEOC)Beijing Laboratory for Environmental Frontier Technologies(BLEFT)School of EnvironmentTsinghua UniversityBeijing100084China CSD IDEA(Beijing)Environmental Test and Analysis Co. Ltd.Beijing100192China School of Public Health Shandong First Medical University&Shandong Academy of Medical ScienceShandong Province250117China

It is essential to determine the occurrence of emerging organic contaminants(EOCs),such as pharmaceuticals and personal care products(PPCPs),in the ambient environment to address growing public ***,such analysis is quite challenging due to the low trace level of such contaminants in water,which therefore requires several litres of water *** this study,a large volume solid phase extraction(LV-SPE)device was developed and evaluated for its performance in monitoring PPCPs as an *** good recoveries and reproducibility were obtained under specific operating conditions:a water sample volume of no more than 20 L,a flow rate not exceeding 120 mL/min,and a methanol elution volume of at least 30 *** addition,the results from the onsite enrichment approach using LV-SPE were compared with those from the conventional approach using a standard SPE device in the laboratory for real groundwater *** the eight selected PPCPs(nalidixic acid,carbamazepine,bezafibrate,clofibric acid,sulfadiazine,sulfamethoxypyridazine,sulfamethazine and sulfamonomethoxine),LV-SPE approach detected more target *** the detected concentrations were generally comparable,slightly higher concentrations were observed for carbamazepine,clofibric acid,sulfadiazine and sulfamethazine using the LV-SPE *** developed LV-SPE device provides an alternative approach for trace analysis of PPCPs and may also be applicable for other emerging organic contaminants.

关键词： Large-volume Solid phase extraction Onsite enrichment PPCPs Emerging organic pollutants

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金融科技、集聚外部性与区域创新——基于空间面板杜宾误差模型的经验分析

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西南民族大学学报（人文社会科学版） 2024年第1期45卷 88-102页

作者：赵丹妮汤子隆广东金融学院金融科技工程技术开发中心广东金融学院经济贸易学院

本项研究基于2011-2022年城市数据,分析金融科技发展、集聚外部性对区域创新水平的影响。相关结果表明,金融科技对区域创新水平具有明显的驱动作用,在叠加了集聚外部性之后,两者对区域创新的影响展现了明显的异质性特征:金融科技、马歇... 详细信息

本项研究基于2011-2022年城市数据,分析金融科技发展、集聚外部性对区域创新水平的影响。相关结果表明,金融科技对区域创新水平具有明显的驱动作用,在叠加了集聚外部性之后,两者对区域创新的影响展现了明显的异质性特征:金融科技、马歇尔外部性抑制区域创新,而金融科技、雅各布外部性有助于区域创新能力提升。此外,金融科技和集聚外部性对于不同区域以及不同城市群的影响也各不相同,具有典型的结构性作用。

关键词：金融科技企业数字化转型区域创新技术创新高质量发展

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广东省中小型非煤地下矿山安全隐患分析与管控对策

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矿业研究与开发 2024年第8期44卷 197-205页

作者：盛建红赵艳艳唐子龙长沙矿山研究院有限责任公司湖南长沙410012 金属矿山安全技术国家重点实验室湖南长沙410012 湖南省矿山地质灾害防治与环境再造工程技术研究中心湖南长沙410012

为揭示广东省中小型非煤地下矿山安全管理现状,挖掘非煤地下矿山常见的安全隐患以及其发生的内在规律,促进广东省中小型非煤地下矿山企业系统性提升安全生产管理水平,防范化解重大安全风险,基于广东省68家非煤地下矿山专家会诊安全隐患... 详细信息

为揭示广东省中小型非煤地下矿山安全管理现状,挖掘非煤地下矿山常见的安全隐患以及其发生的内在规律,促进广东省中小型非煤地下矿山企业系统性提升安全生产管理水平,防范化解重大安全风险,基于广东省68家非煤地下矿山专家会诊安全隐患统计数据,采用分组分析法和因素分析法,研究非煤地下矿山生产作业现场和安全组织管理等方面的安全隐患产生的原因,以及重大事故隐患共性问题,确定了重大安全生产事故隐患和一般安全隐患的各类主要表现。在此基础上,提出了调整产业结构、转变发展方式等13项主要风险管控重点措施,对提高同类型非煤地下矿山安全管理水平和本质安全生产水平具有一定的借鉴意义。

关键词：中小型非煤地下矿山专家会诊隐患分析管控措施

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我国体操教练员综合素质能力评价与提升策略研究

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体育科技文献通报 2024年第3期32卷 59-62,86页

作者：汤自龙西安体育学院陕西西安710068

运用文献资料法、德尔菲法、模糊综合评价法等研究方法建立体操教练员综合素质能力评价指标体系,利用形成的评价指标体系对我国体操教练员综合素质能力进行评价与分析,探究我国体操教练员综合素质能力现实情况以及存在的问题,继而依据... 详细信息

运用文献资料法、德尔菲法、模糊综合评价法等研究方法建立体操教练员综合素质能力评价指标体系,利用形成的评价指标体系对我国体操教练员综合素质能力进行评价与分析,探究我国体操教练员综合素质能力现实情况以及存在的问题,继而依据评价情况探索发展对策。研究得出:我国体操教练员的整体综合素质能力表现比较好,但在专业知识、身心素质方面表现一般。建议:强化思想品德素质,重视师德师风教育;创造学习交流平台,不断提升专业知识与执教能力;建立健全考核评价机制,实施综合素质能力导向的评价体系。

关键词：体操教练员综合素质能力评价指标模糊综合评价

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Nanowires-assembled WO3 nanomesh for fast detection of ppb-level NO2 at low temperature

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Journal of Advanced Ceramics 2020年第1期9卷 17-26页

作者： Di LIU Xiaowei REN Yesheng LI zilong tang Zhongtai ZHANG State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

Hierarchical WO3 nanomesh,assembled from single-crystalline WO3 nanowires,is prepared via a hydrothermal method using thiourea(Tu)as the morphology-controlling *** of the hierarchical architecture comprising of WO3 nanowires takes place via Ostwald ripening mechanism with the growth *** sensor based on WO3 nanomesh has good electrical conductivity and is therefore suitable as NO2 sensing *** WO3 nanomesh sensor exhibited high response,short response and recovery time,and excellent selectivity towards ppb-level NO2 at low temperature of 160℃.The superior gas performance of the sensor was attributed to the high-purity hexagonal WO3 with high specific surface area,which gives rise to enhanced surface adsorption sites for gas *** electron depletion theory was used for explaining the NO2-sensing mechanism by the gas adsorption/desorption and charge transfer happened on the surface of WO3 nanomesh.

关键词： WO3 nanomesh controlling agent NO2 sensing charge transfer

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Effect of Sand Content on Strength and Pore Structure of Cement Mortar

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Journal of Wuhan University of Technology(Materials Science) 2017年第2期32卷 382-390页

作者：卜静武 TIAN Zhenghong ZHENG Shiyu tang zilong College of Water Conservancy and Hydropower Engineering Hohai University Nanjing 210098 China School of Petrochemical Engineering Changzhou University Changzhou 213164 China Sinohydrao Bureau Seventh Co. Ltd. Technology Chengdu 611134 China

The effects of four sand contents on the compressive, flexural and splitting-tensile strength of cement mortars were evaluated. Moreover, we experimentally investigated the pore structure of cement mortar brought about by changing the sand content and water/cement ratio. The changes in the pore structure were quantified by measuring the porosity and pore size distribution obtained by using mercury intrusion porosimetry（MIP） technique. The test results show that the strengths of cement mortar increase with increasing sand content. It is also suggested that the traditional water/cement ratio law can be applied to cement mortar with different sand contents, provided that a slight modification is introduced. Sand content is an important parameter influencing the pore structure of cement mortar. Moreover, there is a good relationship between the pore structure and strength of cement mortar.

关键词： sand content strength cement mortar pore structure

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Synthesis and performance of carbon-modified LiFePO_4 using an in situ PVA pyrolysis procedure

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Journal of University of Science and Technology Beijing 2007年第6期14卷 562-567页

作者： Shaohua Luo zilong tang Junbiao Lu Linfeng Hu Zhongtai Zhang State Key Laboratory of New Ceramics and Fine Processing Department of Materials Science and Engineering Tsinghua University Beijing 100084 China Department of Materials Science and Engineering Northeastern University at Qinhuangdao Branch Qinhuangdao 066004 China

LiFePOa/carbon composite cathode material was prepared by granulating and subsequent pyrolysis processing in N2 atmosphere with polyvinyl alcohol （PVA） as the carbon source. The influences of carbon content on the microstructure and battery performance were investigated. Single LiFePO4 phase and amorphous carbon can be found in the products. A special micro-morphology of the optimum sample was observed. The discharge capacity of the cell with the optimum cathode was 135 mAh.g^-1, close to the charge capacity of 153 mAh.g^-1 at 17 mA.g^-1. The influence of ambient temperature on the cell capacity was investigated. The temperature dependence of its electrochemical characteristic was evaluated by using AC impedance spectroscopy. A new equivalent circuit based on the charge and mass transfer control process in an electrode was proposed to fit the obtained AC impedance spectra. The tendency of every element in the equivalent circuit was used to interpret the temperature dependence of the capacity of the optimum cathode.

关键词： LiFePO4 cathode material temperature-capacity sensitivity AC impedance lithium-ion battery

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Preparation,Characterization and Applications of Titanate/Titania Nanocrystals

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稀有金属材料与工程 2006年第A3期35卷 638-641页

作者： Junrong Li zilong tang Zhongtai Zhang Zhigang Zhou State Key Laboratory of New Ceramics and Fine Processing Department of Materials Science and Engineering Tsinghua University Beijing 100084 China Beijing Institute of Space Medico-Engineering Beijing 100094 China

The present paper focused on the preparation of hydrogen titanate nanotubes and nanowires and their conversion into titania by heat *** structural,morphology and optical properties of as-prepared nanostructured titanate and titania were investigated by transmission electron microscopy (TEM),X-ray diffraction (XRD) and diffusive reflectance *** slim diameter of these nanostructured titanate and titania,the versatile crystal structure and special optical and electronic properties may make them find versatile applications in chemical sensors for multiple purposes.

关键词： titanate titania nanocrystals preparation applications

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Recent progress in Ti-based nanocomposite anodes for lithium ion batteries

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Journal of Advanced Ceramics 2019年第1期8卷 1-18页

作者： Shitong WANG Yong YANG Yanhao DONG Zhongtai ZHANG zilong tang Department of Nuclear Science and Engineering Massachusetts Institute of Technology State Key Lab of New Ceramics and Fine Processing School of Materials Science and Engineering Tsinghua University Department of Materials Science & Engineering College of EngineeringPeking University

Studying on the anode materials with high energy densities for next-generation lithium-ion batteries(LIBs) is the key for the wide application for electrochemical energy storage ***-based compounds as promising anode materials are known for their outstanding high-rate capacity and cycling stability as well as improved safety over graphite. However, Ti-based materials still suffer from the low capacity, thus largely limiting their commercialized application. Here, we present an overview of the recent development of Ti-based anode materials in LIBs, and special emphasis is placed on capacity enhancement by rational design of hybrid nanocomposites with conversion-/alloying-type anodes. This review is expected to provide a guidance for designing novel Ti-based materials for energy storage and conversion.

关键词： lithium-ion batteries(LIBs) anode titania lithium titanate

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