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Mg/Fe site-specific dual-doping to boost the performance of cobalt-free nickle-rich layered oxide cathode for high-energy lithium-ion batteries

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Journal of Energy Chemistry 2024年第4期91卷 670-679页

作者： Yunting Wang gaohui du Di Han Wenhao Shi Jiahao Deng Huayu Li Wenqi Zhao Shukai Ding Qingmei Su Bingshe Xu Materials Institute of Atomic and Molecular Science Shaanxi University of Science and TechnologyXi'an 710021ShanxiChina Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Taiyuan 030024ShanxiChina Key Laboratory of Interface Science and Engineering in Advanced Materials Taiyuan University of TechnologyTaiyuan 030024ShanxiChina

Layer-type LiNi0.9Mn0.1O2is promising to be the primary cathode material for lithium-ion batteries(LIBs)due to its excellent electrochemical ***,the cathode with high nickel content suffers from severely detrimental structural transformation that causes rapid capacity ***,site-specific dual-doping with Fe and Mg ions is proposed to enhance the structural stability of *** Fe3+dopants are inserted into transition metal sites(3b)and can favorably provide additional redox potential to compensate for charge and enhance the reversibility of anionic *** Mg ions are doped into the Li sites(3a)and serve as O_(2)^(-)-Mg^(2+)-O_(2)^(-)pillar to reinforce the electrostatic cohesion between the two adjacent transition-metal layers,which further suppress the cracking and the generation of harmful phase transitions,ultimately improving the *** theoretical calculations,including Bader charge and crystal orbital Hamilton populations(COHP)analyses,confirm that the doped Fe and Mg can form stable bonds with oxygen and the electrostatic repulsion of O_(2)^(-)-O_(2)^(-)can be effectively suppressed,which effectively mitigates oxygen anion loss at the high delithiation *** dual-site doping strategy offers new avenues for understanding and regulating the crystalline oxygen redox and demonstrates significant potential for designing high-performance cobalt-free nickel-rich cathodes.

关键词： Cobalt-free Layered oxide Cathode dual dopants Density functional theory calculation

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支架内新生动脉粥样硬化的研究进展

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华中科技大学学报（医学版） 2024年第4期53卷 545-551页

作者：张青杜高辉魏宇淼华中科技大学同济医学院附属协和医院心内科武汉430022

支架内再狭窄(in-stent restenosis,ISR)和支架内血栓(in-stent thrombosis,IST)是目前经皮冠状动脉介入(percutaneous coronary intervention,PCI)治疗的两大主要并发症,也是阻塞性冠脉病变介入治疗的主要限制因素。支架内新生动脉粥... 详细信息

支架内再狭窄(in-stent restenosis,ISR)和支架内血栓(in-stent thrombosis,IST)是目前经皮冠状动脉介入(percutaneous coronary intervention,PCI)治疗的两大主要并发症,也是阻塞性冠脉病变介入治疗的主要限制因素。支架内新生动脉粥样硬化(in-stent neoatherosclerosis,ISNA)是ISR和IST共同的病理基础,目前研究主要基于光学干涉断层显像(optical coherence tomography,OCT)、血管镜、血管内超声(intravascular ultrasonography,IVUS)等临床影像学观察及尸检报告研究,其具体体机制及治疗手段尚不清楚。全面透彻地理解ISNA的流行病学特征、病理学特征及病因机制不仅有助于预防和治疗支架后并发症,也能为新一代冠脉支架开发奠定基础。该文就ISNA与支架发展史、ISNA病理特征及ISNA病因机制的研究进展进行综述。

关键词：冠心病支架支架内新生动脉粥样硬化

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石墨烯气凝胶复合材料在电化学储能中的应用研究进展

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复合材料学报 2024年第4期41卷 1694-1711页

作者：惠晨柯闫翎鹏杨未鹏崔晋超杨永珍苏庆梅杜高辉刘旭光许并社太原理工大学新材料界面科学与工程教育部重点实验室太原030024 陕西科技大学材料原子•分子材料研究所西安710021 太原理工大学材料科学与工程学院太原030024 山西浙大新材料与化工研究院太原030032

石墨烯气凝胶作为一种内部互连的三维框架体,在微观和宏观尺度上具有突出的维度特性,成为各种零维、一维、二维和三维材料的理想宿主。其高导电性、高比表面积及高结构稳定性等特点令石墨烯气凝胶在储能领域得到了广泛的应用,特别是在... 详细信息

石墨烯气凝胶作为一种内部互连的三维框架体,在微观和宏观尺度上具有突出的维度特性,成为各种零维、一维、二维和三维材料的理想宿主。其高导电性、高比表面积及高结构稳定性等特点令石墨烯气凝胶在储能领域得到了广泛的应用,特别是在高比容量金属离子电池负极和超级电容器电极等领域。首先,本文对石墨烯前体及气凝胶的处理策略进行整理,介绍当前不同处理方式对石墨烯前体及气凝胶成型影响。其次,根据储能机制的不同,介绍石墨烯气凝胶复合材料在主流储能器件中的改性应用及性能表现。最后,对电化学储能用石墨烯气凝胶复合材料的研究进展进行总结,指出当前存在的挑战并展望未来的研究方向。

关键词：石墨烯气凝胶储能材料复合材料储能应用电化学

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Sulfur-deficient CoNi_(2)S_(4)nanoparticles-anchored porous carbon nanofibers as bifunctional electrocatalyst for overall water splitting

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Frontiers of Chemical Science and Engineering 2023年第11期17卷 1707-1717页

作者： gaohui du Yi Fan Lina Jia Yunting Wang Yawen Hao Wenqi Zhao Qingmei Su Bingshe Xu Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Taiyuan 030000China Materials Institute of Atomic and Molecular Science Shaanxi University of Science and TechnologyXi’an 710021China

Water electrolysis technology is considered to be one of the most promising means to produce ***,aiming at the problems of high overpotential and slow kinetics in water splitting,N-doped porous carbon nanofibers-coupled CoNi_(2)S_(4)nanoparticles are prepared as bifunctional *** the strategy,NaCl is used as the template to prepare porous carbon nanofibers with a large surface area,and sulfur vacancies are created to modulate the electronic structure of CoNi_(2)S_(4).Electron spin resonance confirms the formation of abundant sulfur vacancies,which largely reduce the bandgap of CoNi_(2)S_(4)from 1.68 to 0.52 *** narrowed bandgap is conducive to the migration of valence electrons and decreases the charge transfer resistance for electrocatalytic ***,the uniform distribution of CoNi_(2)S_(4)nanoparticles on carbon nanofibers can prevent the aggregation and facilitate the exposure of electrochemical active ***,the composite catalyst exhibits low overpotentials of 340 mV@100 mA·cm^(-2)for oxygen evolution reaction and 380 mV@100 mA·cm^(-2)for hydrogen evolution *** assembled electrolyzer requires 1.64 V to achieve 10 mA·cm^(-2)for overall water-splitting with good long-term *** excellent performance results from the synergistic effect of porous structures,sulfur deficiency,nitrogen doping,and the well-dispersed active component.

关键词： nanoparticle sulfur vacancy porous carbon nanofiber transition metal sulfides electrolysis

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Unraveling the degradation mechanism of LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2) at the high cut-off voltage for lithium ion batteries

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Journal of Energy Chemistry 2023年第2期77卷 428-437,I0011页

作者： Liming Wang Qingmei Su Bin Han Weihao Shi gaohui du Yunting Wang Huayv Li Lin Gu Wenqi Zhao Shukai Ding Miao Zhang Yongzhen Yang Bingshe Xu School of Materials Science&Engineering Shaanxi University of Science and TechnologyXi’an 710021ShaanxiChina Materials Institute of Atomic and Molecular Science Shaanxi University of Science and TechnologyXi’an 710021ShaanxiChina School of Materials Science&Engineering Tsinghua UniversityBeijing 100084China Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Taiyuan 030032ShanxiChina Key Laboratory of Interface Science and Engineering in Advanced Materials Taiyuan University of TechnologyTaiyuan 030024ShanxiChina

LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM811)layered oxides have been regarded as promising alternative cathodes for the next generation of high-energy lithium ion batteries(LIBs)due to high discharge capacities and energy densities at high operation ***,the capacity fading under high operation voltage still restricts the practical ***,the capacity degradation mechanism of NCM811 at atomic-scale is studied in detail under various cut-off voltages using aberration-corrected scanning transmission electron microscopy(STEM).It is observed that the crystal structure of NCM811 evolution from a layered structure to a rock-salt phase is directly accompanied by serious intergranular cracks under 4.9 V,which is distinguished from the generally accepted structure evolution of layered,disordered layered,defect rock salt and rock salt phases,also observed under 4.3 and 4.7 *** electron energy loss spectroscopy analysis also confirms the reduction of Ni and Co from the surface to the bulk,not the previously reported only Li/Ni interlayer *** degradation mechanism of NCM811 at a high cut-off voltage of4.9 V is attributed to the formation of intergranular cracks induced by defects,the direct formation of the rock salt phase,and the accompanied reduction of Ni^(2+)and Co^(2+)phases from the surface to the bulk.

关键词： Ni-rich layered cathode Electrochemical performance Degradation mechanism Crack Atomic scale

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Numerical simulation of the dynamic migration mechanism and prediction of saturation of tight sandstone oil

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Science China Earth Sciences 2024年第1期67卷 179-195页

作者： gaohui CAO Mian LIN Likuan ZHANG Lili JI Wenbin JIANG Institute of Mechanics Chinese Academy of SciencesBeijing 100190China School of Engineering Science University of Chinese Academy of SciencesBeijing 100049China Institute of Geology and Geophysics Chinese Academy of SciencesBeijing 100029China

Quantitative characterization of tight sandstone oil migration and accumulation is an emerging research frontier in the field of oil and gas *** this study,a conceptual model containing multiple basic geological elements is developed,and a nonlinear seepage numerical model for tight sandstone oil migration and accumulation is *** effects of the slip effect,overpressure driving force,buoyancy,and capillary force on the migration and accumulation of tight oil are *** results showed that(1)the differences in oil migration and accumulation between tight and conventional reservoirs are reflected in the growth mode of oil saturation,distribution characteristics of oil and water,and extent of the effect of the formation dip angle;(2)the slip effect has a significant impact when the average pore throat radius is less than 150 nm and the overpressure driving force and capillary force are the main mechanical mechanisms controlling oil migration and accumulation in tight sandstone,while the coupling effect of buoyancy,capillary force,and overpressure driving force controls the upper and lower limits of oil ***,a dimensional and dimensionless identification chart for rapidly predicting the oil saturation of tight sandstone is proposed and verified using the measured *** study provides a basis for analyzing the migration and accumulation mechanisms of tight sandstone oil and a new approach for predicting oil ***,we developed digital and visual analysis methods for the migration results,enriching the expression of the dynamics of hydrocarbon accumulation.

关键词： Tight sandstone Migration and accumulation Dynamics Oil saturation Numerical simulation

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Large-Scale Preparation of Mechanically High-Performance and Biodegradable PLA/PHBV Melt-Blown Nonwovens with Nanofibers

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Engineering 2024年第8期39卷 244-252页

作者： gaohui Liu Jie Guan Xianfeng Wang Jianyong Yu Bin Ding Shanghai Frontier Science Research Center of Advanced Textiles College of TextilesDonghua UniversityShanghai 201620China College of Materials Science and Engineering Qingdao UniversityQingdao 266071China

Biodegradable polylactic acid(PLA)melt-blown nonwovens are attractive candidates to replace nondegradable polypropylene melt-blown ***,it is still an extremely challenging task to prepare PLA melt-blown nonwovens with sufficient mechanical properties for practical ***,we report a simple strategy for the large-scale preparation of biodegradable PLA/poly(3-hydroxybutyrate-co-3-hydroxyvalerate)(PHBV)melt-blown nonwovens with high strength and excellent *** this process,a small amount of PHBV is added to PLA to improve the latter’s crystallization rate and *** addition,when the PHBV content increases from 0 to 7.5 wt%,the diameters of the PLA/PHBV melt-blown fibers decrease significantly(with the proportion of nanofibers increasing from 7.7%to 42.9%).The resultant PLA/PHBV(5 wt%PHBV)melt-blown nonwovens exhibit the highest mechanical *** tensile stress,elongation,and toughness of PLA/PHBV(5 wt%PHBV)melt-blown nonwovens reach 2.5 MPa,45%,and 1.0 MJm3,*** importantly,PLA/PHBV melt-blown nonwovens can be completely degraded into carbon dioxide and water after four months in the soil,making them environmentally friendly.A general tensile-failure model of melt-blown nonwovens is proposed in this study,which may shed light on mechanical performance enhancement for nonwovens.

关键词： PLA PHBV Melt-blown Biodegradable Strength Toughness

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铁催化分解二甲硫醚制备碳纳米管的研究

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化工新型材料 2010年第7期38卷 49-51,66页

作者：苏庆梅杜高辉浙江师范大学物理化学研究所浙江省固体表面反应化学重点实验室金华321004

以二甲硫醚为碳源,Fe/MgO为催化剂,采用化学气相沉积法制备了碳纳米管。通过SEM、Raman、XRD、TEM表征方法研究了实验合成条件对碳纳米管产物的形貌和微结构的影响。结果表明,二甲硫醚的蒸汽浓度对碳纳米管的形貌和产量有重要影响。较... 详细信息

以二甲硫醚为碳源,Fe/MgO为催化剂,采用化学气相沉积法制备了碳纳米管。通过SEM、Raman、XRD、TEM表征方法研究了实验合成条件对碳纳米管产物的形貌和微结构的影响。结果表明,二甲硫醚的蒸汽浓度对碳纳米管的形貌和产量有重要影响。较高的二甲硫醚浓度会使催化剂的活性降低,制备出的碳纳米管较短且石墨化程度也较差。生长碳纳米管的最佳二甲硫醚浓度范围为2.69%～3.86%,且碳纳米管产物中有Y型碳纳米管的生成,并对其生长机理进行了初步讨论。

关键词：碳纳米管二甲硫醚化学气相沉积 Y型碳纳米管

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Diphylleia Grayi-Inspired Intelligent Temperature-Responsive Transparent Nanofiber Membranes

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Nano-Micro Letters 2024年第4期16卷 67-78页

作者： Cengceng Zhao gaohui Liu Yanyan Lin Xueqin Li Na Meng Xianfeng Wang Shaoju Fu Jianyong Yu Bin Ding Shanghai Frontier Science Research Center of Advanced Textiles College of TextilesDonghua UniversityShanghai 201620People’s Republic of China

Nanofiber membranes(NFMs) have become attractive candidates for next-generation flexible transparent materials due to their exceptional flexibility and breathability. However, improving the transmittance of NFMs is a great challenge due to the enormous reflection and incredibly poor transmission generated by the nanofiber-air interface. In this research, we report a general strategy for the preparation of flexible temperature-responsive transparent(TRT) membranes,which achieves a rapid transformation of NFMs from opaque to highly transparent under a narrow temperature window. In this process, the phase change material eicosane is coated on the surface of the polyurethane nanofibers by electrospray technology. When the temperature rises to 37 ℃, eicosane rapidly completes the phase transition and establishes the light transmission path between the nanofibers, preventing light loss from reflection at the nanofiber-air interface. The resulting TRT membrane exhibits high transmittance(> 90%), and fast response(5 s). This study achieves the first TRT transition of NFMs, offering a general strategy for building highly transparent nanofiber materials, shaping the future of next-generation intelligent temperature monitoring, anti-counterfeiting measures, and other high-performance devices.

关键词： Biomimetic Transparent Nanofibrous membrane Temperature response Phase change materials

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花状纳米ZnO的低温水浴制备及生长机理

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材料导报 2009年第22期23卷 21-23页

作者：杨永强杜高辉许并社太原理工大学材料科学与工程学院太原030024 太原理工大学教育部新材料界面与工程重点实验室太原030024 浙江师范大学物理化学研究所金华321004

以氯化锌和氢氧化钠为反应原料,利用水浴恒温加热,在溶液中直接制备出呈花状形貌的纳米ZnO;采用扫描电镜、X射线衍射、透射电子显微镜等分析方法对所得产物的形貌和结构进行了表征,结果表明,在低温(45℃)时可制备出大量呈花状形貌的纳米... 详细信息

以氯化锌和氢氧化钠为反应原料,利用水浴恒温加热,在溶液中直接制备出呈花状形貌的纳米ZnO;采用扫描电镜、X射线衍射、透射电子显微镜等分析方法对所得产物的形貌和结构进行了表征,结果表明,在低温(45℃)时可制备出大量呈花状形貌的纳米ZnO。

关键词： ZnO 花状结构水浴加热

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