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Stabilizing High-Nickel Cathodes via Interfacial Hydrogen Bonding Effects Using a Hydrofluoric Acid-Scavenging Separator

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Engineering 2024年第8期39卷 117-126页

作者： Shijie Zhong Liwei Dong Botao Yuan Yueyao Dong Qun Li yuanpeng ji yuanpeng Liu jiecai Han Weidong He National Key Laboratory of Science and Technology on Advanced Composites in Special Environments &Center for Composite Materials and StructuresHarbin Institute of TechnologyHarbin 150080China MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001China Chongqing Research Institute Harbin Institute of TechnologyChongqing 401151China School of Mechanical Engineering Chengdu UniversityChengdu 610106China

Nickel-rich layered Li transition metal oxides are the most promising cathode materials for high-energydensity Li-ion ***,they exhibit rapid capacity degradation induced by transition metal dissolution and structural reconstruction,which are associated with hydrofluoric acid(HF)generation from lithium hexafluorophosphate *** potential for thermal runaway during the working process poses another *** are promising components to alleviate the aforementioned ***,an ultrathin double-layered separator with a 10 lm polyimide(PI)basement and a 2 lm polyvinylidene difluoride(PVDF)coating layer is designed and fabricated by combining a nonsolvent induced phase inversion process and coating *** PI skeleton provides good stability against potential thermal shrinkage,and the strong PI-PVDF bonding endows the composite separator with robust structural integrity;these characteristics jointly contribute to the extraordinary mechanical tolerance of the separator at elevated ***,unique HF-scavenging effects are achieved with the formation of-CO…H-F hydrogen bonds for the abundant HF coordination sites provided by the imide ring;hence,the layered Ni-rich cathodes are protected from HF attack,which ultimately reduces transition metal dissolution and facilitates long-term cyclability of the Ni-rich ***||NCM811 batteries(where“NCM”indicates LiNi_(x)Co_(y)Mn_(1-x-y)O_(2))with the proposed composite separator exhibit a 90.6%capacity retention after 400 cycles at room temperature and remain sustainable at 60℃with a 91.4%capacity retention after 200 *** adopting a new perspective on separators,this study presents a feasible and promising strategy for suppressing capacity degradation and enabling the safe operation of Ni-rich cathode materials.

关键词： Nickel-rich cathodes Composite separator HF scavenging Transition metal dissolution Long-term cyclability

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A Single-Layer Piezoelectric Composite Separator for Durable Operation of Li Metal Anode at High Rates

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Energy & Environmental Materials 2024年第1期7卷 269-278页

作者： yuanpeng ji Botao Yuan jiawei Zhang Zhezhi Liu Shijie Zhong jipeng Liu yuanpeng Liu Mengqiu Yang Changguo Wang Chunhui Yang jiecai Han Weidong He National Key Laboratory of Science and Technology on Advanced Composites in Special Environments and Center for Composite Materials and Structures Harbin Institute of Technology MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of Technology School of Petroleum Engineering Chongqing University of Science and Technology State Key Laboratory of Urban Water Resource and Environment Harbin Institute of Technology Chongqing Research Institute Harbin Institute of Technology School of Mechanical Engineering Chengdu University

Piezoelectric ceramic and polymeric separators have been proposed to effectively regulate Li deposition and suppress dendrite growth,but such separators still fail to satisfactorily support durable operation of lithiu... 详细信息

关键词： composite separator Li metal anodes piezoelectric materials PVDF-HFP uniform Li deposition

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Modification strategies for non-aqueous, highly proton-conductive benzimidazole-based high-temperature proton exchange membranes

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Chinese Chemical Letters 2024年第4期35卷 43-51页

作者： Yunfa Dong Shijie Zhong Yuhui He Zhezhi Liu Shengyu Zhou Qun Li Yashuai Pang Haodong Xie yuanpeng ji yuanpeng Liu jiecai Han Weidong He National Key Laboratory of Science and Technology on Advanced Composites in Special Environments and Center for Composite Materials and StructuresHarbin Institute of TechnologyHarbin 150080China School of Petroleum Engineering Chongqing University of Science and TechnologyChongqing 401331China School of Physics University of Electronic Science and Technology of ChinaChengdu 610054China MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150001China Chongqing Research Institute Harbin Institute of TechnologyChongqing 401151China School of Mechanical Engineering Chengdu UniversityChengdu 610106China

High-temperature proton exchange membranes(HT-PEMs) possess excellent thermal and outstanding electrochemical stability, providing an avenue to realize high-temperature proton exchange membranes fuel cells(HT-PEMFCs) with both superior power density and long-term durability. Unfortunately, polybenzimidazole(PBI), a typical material for conventional HT-PEMs, fails to compromise the high nonaqueous proton conductivity and high mechanical properties, thus hindering their practical *** efficient nonaqueous proton conduction is crucial for HT-PEMFC, and many insightful research works have been done in this area. However, there still lacks a report that integrates the host-guest interactions of phosphoric acid doping and the structural stability of polymers to systematically illustrate modification strategies. Here, we summarize recent advancements in enhancing the nonaqueous proton conduction of HT-PEMs. Various polymer structure modification strategies, including main chain and side group modification, cross-linking, blocking, and branching, are reviewed. Composite approaches of polymer, including compounding with organic porous polymers, filling the inorganic components and modifying with ionic liquids, etc., are also covered in this work. These strategies endow the HT-PEMs with more free volume, nanophase-separated structure, and multi-stage proton transfer channels, which can facilitate the proton transportation and improve their performance. Finally, current challenges and future directions for further enhancements are also outlined.

关键词： Benzimidazole Nonaqueous proton conduction Free volume Nanophase-separated structure Structure modification

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Electrolyte Engineering for High-Voltage Lithium Metal Batteries

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Research 2022年第4期2022卷 781-832页

作者： LiweiDong Shijie Zhong Botao Yuan yuanpeng ji jipeng Liu yuanpeng Liu Chunhui Yang jiecai Han Weidong He MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150080China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments and Center for Composite Materials and Structures Harbin Institute of TechnologyHarbin 150080China State Key Laboratory of Urban Water Resource and Environment Harbin Institute of TechnologyHarbin 150080China Chongqing Research Institute Harbin Institute of TechnologyChongqing 401151China School of Mechanical Engineering Chengdu UniversityChengdu610106China

High-voltage lithium metal batteries(HVLMBs)have been arguably regarded as the most prospective solution to ultrahigh-density energy storage devices beyond the reach of current ***,the only component inside the HVLMBs in contact with both aggressive cathode and Li anode,is expected to maintain stable electrode/electrolyte interfaces(EEIs)and facilitate reversible Li+***,traditional electrolytes with narrow electrochemical windows fail to compromise the catalysis of high-voltage cathodes and infamous reactivity of the Li metal anode,which serves as a major contributor to detrimental electrochemical performance fading and thus impedes their practical *** stable electrolytes is vital for the further development of ***,optimization principles,design strategies,and future perspectives for the electrolytes of the HVLMBs have not been summarized in *** review first gives a systematical overview of recent progress in the improvement of traditional electrolytes and the design of novel electrolytes for the *** strategies of conventional electrolyte modification,including high concentration electrolytes and CEI and SEI formation with additives,are *** electrolytes including fluorinated,ionic-liquid,sulfone,nitrile,and solid-state electrolytes are also *** addition,theoretical studies and advanced characterization methods based on the electrolytes of the HVLMBs are probed to study the internal mechanism for ultrahigh stability at an extreme *** also foresees future research directions and perspectives for further development of electrolytes in the HVLMBs.

关键词： electrolyte maintain summarized

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Talcum-doped composite separator with superior wettability and heatproof properties for high-rate lithium metal batteries

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Chinese Chemical Letters 2023年第1期34卷 139-144页

作者： Mengqiu Yang yuanpeng ji Yunfa Dong Botao Yuan Liwei Dong yuanpeng Liu Sue Hao Chunhui Yang Xiaoqiang Wu Qingquan Kong jiecai Han Weidong He MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150080China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments and Center for Composite Materials and StructuresHarbin Institute of TechnologyHarbin 150080China State Key Laboratory of Urban Water Resource and Environment Harbin Institute of TechnologyHarbin 150080China School of Mechanical Engineering Chengdu UniversityChengdu 610106China Chongqing Research Institute Harbin Institute of TechnologyChongqing 401151China

Separator is supposed to own outstanding thermal stability,superior wettability and electrolyte uptake,which is essential for developing high-rate and safe lithium metal batteries(LMBs).However,commercial polyolefin separators possess poor wettability and limited electrolyte *** addressing this issue,we put forward a composite separator to implement above functions by doping layered-silicate(talcum)into polyvinylidene fluoride(PVDF).With significant improvement of electrolyte absorption benefiting from the strong adsorption energy values(-1.64-1.70 eV)between talcum and the electrolyte in lithium metal batteries,PVDF/Talcum(PVDF/TM)composite separator owns a small contact angle and superior electrolyte ***/TM composite separator with 10 wt%talcum(T-10)owns a tiny contact angle of 8°,while those of polypropylene(PP)and PVDF are 48°and 20°with commercial ***,the addition of thermotolerant talcum endows the T-10 composite separator with great thermostability,whose thermal shrinkage is only 5.39%at 150°C for 0.5 *** cell with LiFeO4cathode and the T-10 composite separator reaches 91.7 m Ah/g in discharge capacity at 4.8 m A/cm^(2)(10 C),far superior to that with pure PVDF separator(56.3 m Ah/g)and PP(51.4 m Ah/g).

关键词： Lithium metal batteries Composite separator PVDF Talcum Wettability Thermal stability

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Rational Design and Construction of a CdS QDs/InVO4 Atomic-Layer（110）/（110） Facet S-Scheme Heterojunction for Highly Efficient Photocatalytic Degradation of C2H4

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Energy & Environmental Materials 2024年第3期7卷 215-222页

作者： yuanpeng Dong Peizhu ji Xinyue Xu Rong Li Yin Wang Kevin Peter Homewood Xiaohong Xia Yun Gao Xuxing Chen Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials School of Materials Science&Engineering Hubei University Hubei Key Laboratory of Low Dimensional Optoelectronic Materials and Devices Hubei University of Arts and Science State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences United Water (Xianning) Company Limited

Exploring high efficiency S-scheme heterojunction photocatalysts with strong redox ability for removing volatile organic compounds from the air is of great interest and ***,how to predict and regulate the transport of photogenerated carriers in heterojunctions is a great ***,density functional theory calculations were first used to successfully predict the formation of a CdS quantum dots/InVO4atomic-layer （110）/（110） facet S-scheme ***,a CdS quantum dots/InVO4atomic-layer was synthesized by in-situ loading of CdS quantum dots with （110） facets onto the（110） facets of *** a result of the deliberately constructed built-in electric field between the adjoining facets,we obtain a remarkably enhanced photocatalytic degradation rate for *** rate is 13.8 times that of pure CdS and 13.2 times that of pure ***-situ irradiated X-ray photoelectron spectroscopy,photoluminescence and time-resolved photoluminescence measurements were carried *** experiments validate that the built-in electric field enhanced the dissociation of photoexcited excitons and the separation of free charge carriers,and results in the formation of S-scheme charge transfer *** reaction mechanism of the photocatalytic C2H4oxidation is investigated by in-situ electron paramagnetic *** work provides a mechanistic insight into the construction and optimization of semiconductor heterojunction photocatalysts for application to environmental remediation.

关键词： CdS QDs InVO4 atomic-layer photocatalysis S-scheme volatile organic compounds

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地奥心血康辅助阿托伐他汀联合氯吡格雷治疗高血压合并冠脉介入术后心绞痛的效果

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中国药物滥用防治杂志 2024年第7期30卷 1313-1316,1320页

作者：徐远鹏翟晓晓姬春好平顶山市第二人民医院河南平顶山467000

目的:观察地奥心血康联合阿托伐他汀和氯吡格雷治疗高血压合并冠脉介入术后心绞痛的应用效果。方法:选取本院2022年1月—2023年1月收治的68例高血压合并冠脉介入术后心绞痛患者,按照随机数字表法分为研究组(34例)和对照组(34例),对照组... 详细信息

目的:观察地奥心血康联合阿托伐他汀和氯吡格雷治疗高血压合并冠脉介入术后心绞痛的应用效果。方法:选取本院2022年1月—2023年1月收治的68例高血压合并冠脉介入术后心绞痛患者,按照随机数字表法分为研究组(34例)和对照组(34例),对照组采用阿托伐他汀和氯吡格雷治疗,研究组在对照组基础上联用地奥心血康,比较两组临床疗效、心功能、左心室内径、临床症状改善情况及不良反发生情况。结果:研究组治疗总有效率和左心室射血分数(LVEF)高于对照组,且不良反应发生率、血小板聚集率及黏附率、平均动脉压(MAP)、左心室收缩期末内径(LVESD)与舒张期末内径(LVEDD)均低于对照组,心绞痛持续时间短于对照组,发作次数少于对照组(P<0.05)。结论:地奥心血康联合阿托伐他汀和氯吡格雷治疗高血压合并冠脉介入术后心绞痛效果较好,可有效缓解患者高血压和心绞痛发作情况,提升心功能表达,并降低不良反应发生风险,临床疗效和安全性更高。

关键词：地奥心血康阿托伐他汀氯吡格雷高血压冠脉介入术心绞痛

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A novel inflatable rings supported design and buoyancy-weight balance deformation analysis of stratosphere airships

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Chinese Journal of Aeronautics 2022年第1期35卷 340-347页

作者： Weinan GAO ji ZHANG Teng MA Guochang LIN yuanpeng LIU Changguo WANG Huifeng TAN Center for Composite Materials Harbin Institute of TechnologyHarbin 150001China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150080China

Owing to the unique advantages in flight altitude,dwelling time and wide coverage area,stratospheric airships provide permanent monitoring and surveillance for both civil and military *** we propose a semi-rigid stratosphere airship design with circumferential high-pressure inflatable rings and a longitudinal carbon fiber skeleton supported *** perform numerical simulations to analyze the deformation characteristics during the whole ascending and descending *** equivalent internal gradient pressure model of helium is established based on the capsule shape and buoyancy-weight equilibrium *** implicit dynamic method is used to deal with the large deformation of the airship capsule under a low negative pressure *** and load-bearing performance of the airship capsule,inflatable ring,skeleton,and suspension line are obtained under different working *** results show that the airship,supported with the inflatable rings and the suspension lines,effectively maintains the shape and ensures the stiffness during the ascending,dwelling,and descending stages,especially suffering from negative pressure.

关键词： Buoyancy-weight balance Large deformation Load-bearing performance Negative pressure Stratospheric airship

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基于管理视角的服务设计问题的研究综述与展望

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系统工程理论与实践 2021年第2期41卷 400-410页

作者：雒兴刚张忠良阮渊鹏苑嘉航姬朋立杭州电子科技大学管理学院杭州310018

服务设计是一项高风险和高投入的活动.在复杂、多变和不确定的市场环境中,如何利用科学的理论和方法来设计服务产品,在合理利用服务资源的基础上保证服务质量,是服务企业获得竞争优势的关键之一.通过对服务设计现有文献的梳理和回顾,首... 详细信息

服务设计是一项高风险和高投入的活动.在复杂、多变和不确定的市场环境中,如何利用科学的理论和方法来设计服务产品,在合理利用服务资源的基础上保证服务质量,是服务企业获得竞争优势的关键之一.通过对服务设计现有文献的梳理和回顾,首先分析了服务设计的相关概念和外延;然后基于管理视角,从服务模式、服务内容、服务流程、服务系统等几个方面对服务设计领域的相关文献进行了综述;最后,对新信息技术环境下的服务设计研究方向进行了展望.

关键词：服务设计服务开发顾客需求信息技术

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速度400 km/h轮对初始旋转惯性对滚动接触有限元模型的影响

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铁道学报 2023年第7期45卷 126-133页

作者：徐凡何远鹏冀怡名圣小珍肖新标西南交通大学牵引动力国家重点实验室四川成都610036 上海工程技术大学城市轨道交通学院上海201620

基于显式动力学有限元方法所建立的三维轮轨滚动接触模型是研究高速铁路轮轨相互作用的有效工具。该模型既考虑轮轨的真实几何形状(包括不平顺)和材料非线性,又详细考虑轮轨间的几何接触关系和轮轨系统的纵向动力学性能,得到广泛的应用... 详细信息

基于显式动力学有限元方法所建立的三维轮轨滚动接触模型是研究高速铁路轮轨相互作用的有效工具。该模型既考虑轮轨的真实几何形状(包括不平顺)和材料非线性,又详细考虑轮轨间的几何接触关系和轮轨系统的纵向动力学性能,得到广泛的应用。在具体实现模型仿真时,采用隐式-显式相结合的办法。传统的做法是,隐式计算时不考虑车轮的旋转,只考虑重力作用下的静态位移场,然后将得到的静态结果作为显式计算的初始条件,同时对车轮施加前进速度和转动角速度以及转矩等条件,求解轮轨的相互作用。大量文献表明,用这种做法来启动显式动力学求解,会产生剧烈的初始瞬态响应,导致求解时间过长,甚至不收敛,尤其在速度高达400 km/h时。基于此,对上述模型进行了改进,在进行隐式计算时,首先考虑车轮的旋转,得到车轮在离心力作用下的位移,在此基础上再考虑车轮受重力作用与钢轨发生接触,得到接触斑、法向接触应力以及车轮的应力应变等,然后将更新后的结果作为显式计算的初始条件进行显式动力学求解。算例表明:改进后的模型可大大减小初始瞬态响应,减少有限元节点和网格数,从而加快计算的收敛过程,提高计算效率;轮轨力频谱存在无衰减频带,在该频带内轮轨力随着模型长度的增加几乎不衰减,传统方法难以通过增加求解区的方式得到稳态轮轨力。

关键词：隐式-显式有限元法三维滚动接触模型轮轨相互作用速度400 km/h

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