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Weakly solvating electrolyte enabling solvent-free co-intercalation for stable potassium-ion storage in graphite

Nano Research 2025年第3期18卷 234-242页

作者： Chaojie Cheng Wencong Feng Feiyue Wang Jingke Ren Deyang Guan Wei Chen Jean-Jacques Gaumet Kai Fu Xiaobin Liao Wen Luo State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China School of Materials Science and Engineering Xinjiang UniversityUrumqi 830017China Laboratoire de Chimie et Physique:Approche Multi-échelles des Milieux Complexes(LCP-A2MC)Institut Jean BarriolUniversitéde LorraineMetz 57070France

Ether electrolytes for potassium-ion batteries exhibit a broader electrochemical window and greater applicability,yet most of them are high-concentration electrolytes with elevated *** this study,we propose the use of a weakly solvating cyclic ether electrolyte with tetrahydropyran(THP)as the *** approach induces the formation of a thin and dense inorganic-rich solid electrolyte interphase(SEI)film,which is accompanied by a decrease in the activation energy of electrode interfacial reactions due to the weak ligand binding of THP with K^(+).Density functional theory(DFT)simulations also corroborate the hypothesis that K^(+)has a lower binding energy with *** potassium storage process,the phenomenon of solvent co-intercalation of graphite does not occur,which greatly reduces the destruction of the graphite structure and enables a superior electrochemical performance and enhanced cycling stability at a lower concentration(2 M).At a current density of 0.2 C(55.8 mA·g^(-1)),the battery can be stably cycled for 800 cycles(approximately 8 months)with a specific capacity of 171.8 mAh·g^(-1).This study provides a new ether-based electrolyte for potassium ion batteries and effectively reduces the electrolyte cost,which is expected to inspire further development of energy storage batteries.

关键词： weakly solvating electrolyte co-intercalation graphite potassium ion batteries

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Medium-entropy(Me,Ti)_(0.1)(Zr,Hf,Ce)_(0.9)O_(2)(Me=Y and Ta):Promising thermal barrier materials for high-temperature thermal radiation shielding and CMAS blocking

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Journal of materials Science & technology 2022年第28期123卷 144-153页

作者： Shuaihang Qiu Huimin Xiang Fu-Zhi Dai Hailong Wang Muzhang Huang Chunlei Wan Qing Meng Jiangtao Li Xiaohui Wang Yanchun Zhou Science and Technology on Advanced Functional Composite Laboratory Aerospace Research Institute of Materials and Processing TechnologyBeijing 100076China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China State Key Lab of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Technical Institute of Physics and Chemistry Chinese Academy of SciencesBeijing 100190China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China

With continuous enhancement of gas-turbine inlet temperature and rapid increase of radiant heat transfer,thermal barrier coating(TBC)materials with a combination of low thermal conductivity and good high-temperature thermal radiation shielding performance play vital roles in ensuring the durability of metallic ***,yttria-stabilized zirconia(YSZ),as the state-of-the-art TBC and current industry standard,is unable to meet such demands since it is almost translucent to high-temperature thermal ***,poor corrosion resistance of YSZ to molten calcia-magnesia-alumina-silicates(CMAS)also impedes its application in sand,dust,or volcanic ash laden *** order to improve the hightemperature thermal radiation shielding performance and CMAS resistance of YSZ and further reduce its thermal conductivity,two medium-entropy(ME)oxide ceramics,ME(Y,Ti)_(0.1)(Zr,Hf,Ce)_(0.9)O_(2)and ME(Ta,Ti)_(0.1)(Zr,Hf,Ce)_(0.9)O_(2),were designed and prepared by pressureless sintering of binary powder compacts in this ***(Y,Ti)_(0.1)(Zr,Hf,Ce)_(0.9)O_(2)presents cubic structure but a trace amount of secondary phase,while ME(Ta,Ti)_(0.1)(Zr,Hf,Ce)_(0.9)O_(2)displays a combination of tetragonal phase(81.6 wt.%)and cubic phase(18.4 wt.%).Both ME(Y,Ti)_(0.1)(Zr,Hf,Ce)_(0.9)O_(2)and ME(Ta,Ti)_(0.1)(Zr,Hf,Ce)_(0.9)O_(2)possess better high-temperature thermal radiation shielding performance than ***,the high-temperature thermal radiation shielding performance of ME(Ta,Ti)_(0.1)(Zr,Hf,Ce)_(0.9)O_(2)is superior to that of ME(Y,Ti)_(0.1)(Zr,Hf,Ce)_(0.9)O_(2)due to its narrower band gap and correspondingly higher infrared absorbance(above 0.7)at the waveband of 1 to 5μ*** two ME oxides also display significantly lower thermal conductivity than YSZ and close thermal expansion coefficients(TECs)to YSZ and Ni-based *** addition,the two ME oxides possess excellent CMAS *** attack by molten CMAS at 1250℃for 4 h,merely~2μm thick penetration

关键词： Medium-entropy ceramics Thermal barrier coatings Thermal radiation shielding CMAS resistance Infrared absorbance

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Engineering design of feedstock powder and relevant thermal-mechanical performance of thermal/environmental barrier coatings

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Journal of advanced Ceramics 2025年第2期14卷 37-56页

作者： Xinchang Feng Fangwei Guo Lirong Luo Yuzhang Wang Yun Long Xiaofeng Zhao Fei Pan Lei Guo Qingfeng Zeng Jing Feng Chunlei Wan Shanghai Key Laboratory of Advanced High-temperature Materials and Precision Forming School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China National Engineering Research Center of Special Equipment and Power System for Ship and Marine Engineering Shanghai 200030China School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai 200240China State Key Laboratory of Advanced Nuclear Energy Technology Nuclear Power Institute of ChinaChengdu 610213China Innovative Sensor Technology IST AG Ebnat-Kappel 9642Switzerland School of Materials Science and Engineering Tianjin UniversityTianjin 300072China Tianmushan Laboratory Hangzhou 311115China School of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

The development of aeroengine with a high thrust-weight ratio poses great challenges for current top-coating thermal barrier coatings (TBCs) and environmental barrier coatings (EBCs) in service. Medium/high-entropy ceramics are highly promising candidate material for advanced TBCs/EBCs owing to their low thermal conductivity, high melting point, high-temperature stability, and calcium–magnesium–alumino–silicate (CMAS) resistance. Most feedstock powder used for medium/high-entropy TBCs/EBCs is prepared via traditional spray drying, which cannot fully exploit the advantages of multicomponent ceramics. The density, sphericity, inner structure, and flowability of feedstock powder affect their melting state during the thermal spraying process, which strongly affects the microstructure and properties of the deposited coatings. Therefore, the deposited coatings exhibit phase segregation, amorphous phases, and microstructure defects owing to unpredictable variations in feedstock powder with random morphologies and structures. Here, the structure and properties of feedstock powder prepared by state-of-the-art granulation technologies and their influences on the deposited coatings were systematically investigated, which can provide guidance for configuration optimization of feedstock powder and the manufacturing accuracy of the deposited coating. This review aims to bridge the gap between cutting-edge ceramics and advanced engineering technologies, thus providing concrete background knowledge and crucial guidelines for designing and developing TBCs/EBCs.

关键词： thermal/environmental barrier coatings(TBCs/EBCs) spraying ceramic powder multiscale structure control high-entropy ceramics thermal-mechanical performance

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Dual occupations of sulfur induced band flattening and chemical bond softening in p-type S_(y)Co_(4)Sb_(12-2y)S_(2y) skutterudites

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Journal of Materiomics 2022年第1期8卷 88-95页

作者： Jialiang Li Xiaolian Zhang Haoqin Ma Bo Duan Guodong Li Jiong Yang Hongtao Wang Houjiang Yang Ling Zhou Pengcheng Zhai Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics Wuhan University of TechnologyWuhan430070China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China Materials Genome Institute Shanghai University99 Shangda RoadShanghai200444China

The electronegative filling in skutterudites not only broadened the scope of filling atoms,but also facilitated the preparation of p-type ***,the introduction of a single sulfur atom in the Co_(4)Sb_(12) cannot be achieved without charge compensation through the traditional equilibrium *** the present study,the dual occupations of S-atoms by self-charge compensation were shown as the most stable forms under high pressure,and a series of p-type S_(y)Co_(4)Sb_(12-2y)S_(2y) skutterudites was successfully prepared by high-pressure-high-temperature(HPHT)*** electronic structures and transport properties of as-obtained materials were investigated,and the related mechanisms were *** results suggested that the presence of S-impurities led to flattening of the electronic band that led to a higher Seebeck *** S-doped Co_(4)Sb_(12) displayed lower elastic modulus,elastic constant,and Debye temperature,thus indicating the chemical bond softening in *** thermal conductivities of S_(y)Co_(4)Sb_(12-2y)S_(2y) compounds reduced monotonously with the increase in *** study provides a new and promising avenue for optimizing the thermoelectric properties of p-type Co_(4)Sb_(12).

关键词： Electronegative filling skutterudites Self-charge compensation Band flattening Bond softening

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Data-driven casting defect prediction model for sand casting based on random forest classification algorithm

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China Foundry 2024年第2期21卷 137-146页

作者： Bang Guan Dong-hong Wang Da Shu Shou-qin Zhu Xiao-yuan Ji Bao-de Sun Shanghai Key Lab of Advanced High-Temperature Materials and Precision Forming School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China State Key Lab of Metal Matrix Composites Shanghai Jiao Tong UniversityShanghai 200240China Hefei Casting and Forging Factory of Anhui Heli Co. LtdHefei 230000China State Key Laboratory of Materials Processing and Die&Mould Technology Huazhong University of Science and TechnologyWuhan 430074China

The complex sand-casting process combined with the interactions between process parameters makes it difficult to control the casting quality,resulting in a high scrap rate.A strategy based on a data-driven model was proposed to reduce casting defects and improve production efficiency,which includes the random forest(RF)classification model,the feature importance analysis,and the process parameters optimization with Monte Carlo *** collected data includes four types of defects and corresponding process parameters were used to construct the RF *** results show a recall rate above 90% for all *** Gini Index was used to assess the importance of the process parameters in the formation of various defects in the RF ***,the classification model was applied to different production conditions for quality *** the case of process parameters optimization for gas porosity defects,this model serves as an experimental process in the Monte Carlo method to estimate a better temperature *** prediction model,when applied to the factory,greatly improved the efficiency of defect *** show that the scrap rate decreased from 10.16% to 6.68%.

关键词： sand casting process data-driven method classification model quality prediction feature importance

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High-temperature deformation behavior and processing map of the as-cast Inconel 625 alloy

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Rare Metals 2021年第8期40卷 2083-2091页

作者： Zhi Jia Ze-Xi Gao Jin-Jin Ji De-Xue Liu Ting-Biao Guo Yu-Tian Ding School of Material Science and Engineering Lanzhou University of TechnologyLanzhou730050China Key State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of TechnologyLanzhou730050China School of Materials Engineering Lanzhou Institute of TechnologyLanzhou730050China

A short process of Inconel 625 alloy tube was developed to solve the problems of the traditional extrusion process,and particular attention was paid on the hot deformation behavior of the as-cast Inconel 625 *** hot compression experiments were performed to study the hot deformation behavior of Inconel 625 in the temperature range of 900-1200℃ and strain rate range of0.01-10.00 s^(-1) by *** hot compressed microstructure was examined to study the effects of temperature and strain rate on the microstructural characteristic by electron backscatter diffraction(EBSD).The results show that the processing maps were greatly influenced by the temperature rather than the strain *** is found that with the strain increasing,the instability zone gradually turned to the low-temperature and low strain rate area,while the range of high-temperature instability area *** optimum condition of the as-cast Inconel 625 alloy was determined as high strain rate region(temperature of1100-1200℃,strain rate of 1.00-10.00 s^(-1))with the dissipation efficiency of above *** illustrated by microstructural characteristic of EBSD analysis,the perfect dynamic recrystallization occurred and fine grain structure was obtained under this deformation conditions.

关键词： Inconel 625 Hot deformation behavior Constitutive equation Microstructure processing map

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Enhancing crystal integrity and structural rigidity of CsPbBr_(3) nanoplatelets to achieve a narrow colorsaturated blue emission

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Light(Science & Applications) 2024年第5期13卷 985-997页

作者： Qianqian Huang Wenxu Yin Bo Gao Qingsen Zeng Dong Yao Hao Zhang Yinghe Zhao Weijia Zheng Jiaqi Zhang Xuyong Yang Xiaoyu Zhang Andrey L.Rogach Key Laboratory of Automobile Materials MOE School of Materials Science&Engineeringand Jilin Provincial International Cooperation Key Laboratory of High-Efficiency Clean Energy MaterialsJilin UniversityChangchunChina. State Key Laboratory of Supramolecular Structure and Materials College of ChemistryJilin UniversityChangchunChina. State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhanHubeiChina. Department of Chemistry University of VictoriaVictoriaBCCanada. Key Laboratory of Advanced Display and System Applications of Ministry of Education Shanghai UniversityShanghaiChina. Department of Materials Science and Engineering and Centre for Functional Photonics(CFP)City University of Hong KongHong Kong S.A.RChina

Quantum-confined CsPbBr_(3) perovskites are promising blue emitters for ultra-high-definition displays,but their soft lattice caused by highly ionic nature has a limited ***,we endow CsPbBr_(3) nanoplatelets(NPLs)with atomic crystal-like structural rigidity through proper surface engineering,by using strongly bound N-dodecylbenzene sulfonic acid(DBSA).A stable,rigid crystal structure,as well as uniform,orderly-arranged surface of these NPLs is achieved by optimizing intermediate reaction stage,by switching from molecular clusters to mono-octahedra,while interaction with DBSA resulted in formation of a Cs_(x)O monolayer shell capping the NPL *** a result,both structural and optical stability of the CsPbBr3 NPLs is enhanced by strong covalent bonding of DBSA,which inhibits undesired phase transitions and decomposition of the perovskite phase potentially caused by ligand ***,rather small amount of DBSA ligands at the NPL surface results in a short inter-NPL spacing in their closely-packed films,which facilitates efficient charge injection and *** photoluminescence of the produced CsPbBr_(3) NPLs is bright(nearly unity emission quantum yield)and peaks at 457 nm with an extremely narrow bandwidth of 3.7 nm at 80 K,while the bandwidth of the electroluminescence(peaked at 460 nm)also reaches a record-narrow value of 15 nm at room *** value corresponds to the CIE coordinates of(0.141,0.062),which meets Rec.2020 standards for ultra-high-definition displays.

关键词： temperature stability narrow

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Microstructure and Properties of Micro-Alloyed Mg-2.0Nd-0.2Sr by Heat Treatment and Extrusion

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Acta Metallurgica Sinica(English Letters) 2023年第2期36卷 323-334页

作者： Zhenzhen Gui Fan Jiang Zhixin Kang Fan Zhang Zu Li Jianhui Zhang School of Mechanical and Electrical Engineering Guangzhou UniversityGuangzhou510006China Joint Institute of Guangzhou University and Institute of Corrosion Science and Technology Guangzhou UniversityGuangzhou510006China Guangdong Key Laboratory for Advanced Metallic Materials Processing School of Mechanical and Automotive EngineeringSouth China University of TechnologyGuangzhou510640China

Magnesium(Mg)and its alloys have broad application prospects in the fields such as biomedical materials and automobile manufacturing.A micro-alloyed Mg-2.0Nd-0.2Sr(wt.%)magnesium alloy is designed and obtained through semicontinuous *** evolution of microstructures and tensile properties are investigated with different heat treatments and extrusion *** grain sizes decrease significantly after extrusion,thus changing the fracture mode during the tensile testing *** ultimate tensile strength(UTS),yield strength(YS)and elongation(EL)of the properly processed extrusion alloy(referred to as MNS-E2)reach to 247 MPa,228 MPa and 24%,*** dramatical improvement of mechanical properties results from the refined grains and interactions between dislocations and *** nanoparticle bands blocking the slippage and movement of dislocations are also found in the MNS-E2 *** above causes combined result in an integrated effect of grain boundary strengthening,dislocation strengthening,precipitation strengthening and nanoparticle band *** contribution of strengthening mechanisms of MNS-E2 alloy consists of grain boundary with around 96 MPa,dislocations with around 3.4 MPa,precipitation strengthening with around 45 MPa and the nanoparticle band with around 18 MPa,respectively.

关键词： Mg-Nd-Sr alloy Hot extrusion Mechanical properties Strengthening mechanisms

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The Influence of Ball Milling Time and Sintering Temperature on the Structural and Capabilities of FeCoCrNiMn High-Entropy Alloy 9

The Influence of Ball Milling Time and Sintering Temperature...

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2023 9th International Conference on Applied materials and Manufacturing technology, ICAMMT 2023

作者： Ma, Yutian Wang, Zhenming Tang, Xingchang Cheng, Ganghu Liu, Yajun Chen, Kexuan Zhang, Zhijian Lu, Sujun Sun, Yuanjun Liu, Junzhao State Key Laboratory of Nickel and Cobalt Resources Comprehensive Utilization Jinchang737100 China State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of Technology Lanzhou730050 China

This study reports the fabrication of FeCoCrNiMn high-entropy alloy using high-purity powders of Fe, Co, Cr, Ni, and Mn through the processes of mechanical alloying (MA) and spark plasma sintering (SPS). We systematically investigated the effects of different ball milling times (10 h, 20 h, 30 h, 40 h, 50 h) and sintering temperatures (700°C, 800°C, 900°C, 1000°C, 1100°C) on the structure and capabilities of the alloy. The findings indicate that the atomic proportion of Fe:Co:Cr:Ni:Mn approach 1:1:1:1:1. The distribution of all elements is basically uniform, but the Cr element is slightly biased in the structure after 40 h ball milling. The voids in the structure are gradually decreasing as temperatures rise. The matrix structure is mainly composed of a white FCC matrix phase and a gray Cr-rich σ phase. The alloy structure is the densest. It has the highest density of 7.060 g/cm3, the highest compressive strength of 1480 MPa, and a plastic deformation of 13% when the SPS temperature reaches 1000°C. The FeCoCrNiMn high-entropy alloy is prepared by a ball milling time of 40 h, and spark plasma sintering of 1000°C has the best comprehensive properties. © Published under licence by IOP Publishing Ltd.

关键词： Spark plasma sintering

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Prediction of intrusive gas pores caused by resin burning in sand core for iron castings

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China Foundry 2025年第1期22卷 23-32页

作者： Ji-wu Wang Xiao-long Wang Yu-cheng Sun Yu-hang Huang Xiu-ming Chen Xiong-zhi Wu Na Li Jin-wu Kang Tao Jing Tian-you Huang Hai-liang Yu School of Mechanical Electronic and Control EngineeringBeijing Jiaotong UniversityBeijing 100044China Weichai Power Co. Ltd.Weifang 261061ShandongChina School of Mechanical Engineering Central South UniversityChangsha 41000China School of Materials Science and Engineering Key Laboratory for Advanced Materials Processing TechnologyTsinghua UniversityBeijing 100084China

In the production of castings,intrusive gas pore represents a kind of common defects which can lead to leakage in high gas-tightness requirement castings,such as cylinder blocks and cylinder heads for *** occurs due to the intrusion of gases generated during the resin burning of the sand core into castings during the casting ***,a gas generation and flow constitution model was established,in which the gas generation rate is a function of temperature and time,and the flow of gas is controlled by the gas release,conservation,and Darcy's *** heat transfer and gas flow during casting process was numerically *** dangerous point of cores is firstly identified by a virtual heat transfer method based on the similarity between heat transfer and gas flow in the sand *** gas pores in castings are predicted by the gas pressure,the viscosity and state of the melt for these dangerous *** distinct sand core structures were designed and used for the production of iron castings,and the simulated gas pore results were validated by the obtained castings.

关键词： gas pore numerical simulation iron casting sand core resin

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