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Surface-roughened current collectors for anode-free all-solid-state batteries

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Journal of Energy Chemistry 2022年第7期31卷 248-257,I0007页

作者： Donghee Gu Hyoungchul Kim Jong-Ho Lee Sangbaek Park Energy materials Research Center Korea Institute of Science and Technology(KIST)Seoul 02792.Republic of Korea School of Civil Environmental and Architectural EngineeringKorea University.Seoul 02841.Republic of Korea Division of Nanoscience and Technology University of Science and Technology(UST)Seoul02792.Republicof Korea department of materials Science and engineering Chungnam National UniversityDaejeon 34134.Republic of Korea

Anode-free all-solid-state batteries(AFASSBs), composed of a fully lithiated cathode and a bare current collector(CC) that eliminates excess lithium, can maximize the energy density(because of a compact cell configuration) and improve the safety of solid-state systems. Although significant progress has been made by modifying CCs in liquid-based anode-free batteries, the role of CCs and the mechanism of Li formation on CCs in AFASSBs are still unexplored. Here, we systematically investigate the effect of the surface roughness of the CCs on the Li plating/stripping behavior in AFASSBs. The results show that the moderately roughened CC substantially improves the Coulombic efficiency and cycle stability of AFASSBs owing to the increased contact points between the solid electrolyte and the roughened CC. In contrast, the excessively roughened CC deteriorates the performance owing to the contact ***, an ex situ interface analysis reveals that the roughened surface of the CC could suppress the interfacial degradation during the Li ion extraction from a sulfide solid electrolyte to a CC. This provides an indication to the origin that hinders the electrochemical performance of AFASSBs. These findings show the potential for the application of surface-engineered CCs in AFASSBs and provide guidelines for designing advanced CCs.

关键词： Anode-free Solid-state batteries Current collectors Surface roughness Li formation

Preparation and Properties of TiO2-Coated Hollow Glass Microspheres as Thermal Insulation materials for Energy-Saving Buildings

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Transactions of Tianjin University 2020年第4期26卷 283-291页

作者： Chunyu Wu Weilin Wang Huiming Ji Key Laboratory of Advanced ceramics and Machining Technology of Ministry of Education School of Materials Science and EngineeringTianjin UniversityTianjin 300072China

A hollow glass microsphere(HGM)/TiO2 composite hollow sphere was successfully prepared via a simple precipitation *** TiO2 coating layers grew on the surface of the HGMs that range from 20 to 50μm in diameter as nanoparticles with the formation of the SiO Ti *** growth mechanism accounting for the formation of the TiO2 nanolayers was *** morphology,composition,thermal insulation properties,and visible-near infrared(VIS-NIR)refl ectance of the HGMs/TiO2 composite hollow spheres were *** VIS-NIR reflectance of the HGMs/TiO2 composite hollow spheres increased by more than 30%compared to raw *** thermal conductivity of the particles is 0.058 W/(m K).The result indicates that the VIS-NIR reflectance of the composite hollow spheres is strongly influenced by the coating of *** composite hollow spheres were used as the main functional filler to prepare the organic-inorganic composite *** glass substrates coated by the organic-inorganic coatings had lower thermal conductivity and higher near infrared ***,the HGMs/TiO2 composite hollow spheres can reflect most of the solar energy and effectively keep out the heat as a thermal insulation coating for energy-saving constructions.

关键词： TiO2 Hollow glass microspheres Thermal insulation materials Near infrared reflectance

Evaluation of microstructure and mechanical properties of squeeze overcast Al7075-Cu composite joints

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China Foundry 2023年第1期20卷 29-39页

作者： Muhammad Waqas Hanif Ahmad Wasim Muhammad Sajid Salman Hussain Muhammad Jawad Mirza Jahanzaib department of Industrial engineering University of Engineering and Technology TaxilaPunjabPakistan

Al7075-Cu composite joints were prepared by the squeeze overcast *** effects of melt temperature,die temperature,and squeeze pressure on hardness and ultimate tensile strength(UTS)of squeeze overcast Al7075-Cu composite joints were *** experimental results depict that squeeze pressure is the most significant process parameter affecting the hardness and *** optimal values of UTS(48 MPa)and hardness(76 HRB)are achieved at a melt temperature of 800℃,a die temperature of 250℃,and a squeeze pressure of 90 *** electron microscopy(SEM)shows that fractured surfaces show flatfaced morphology at the optimal experimental ***-dispersive spectroscopy(EDS)analysis depicts that the atomic weight percentage of Zn decreases with an increase in melt temperature and squeeze *** optimal mechanical properties of the Al7075-Cu overcast joint were achieved at the Al2Cu eutectic phase due to the large number of copper atoms that dispersed into the aluminum melt during the solidification process and the formation of strong intermetallic *** relational analysis integrated with the Taguchi method was used to develop an optimal set of control variables for multi-response parametric *** tests were performed to validate the effectiveness of the employed *** manufacturing of squeeze overcast Al7075-Cu composite joints at optimal process parameters delivers a great indication to acknowledge a new method for foundry practitioners to manufacture materials with superior mechanical properties.

关键词： squeeze overcast joints Al7075-Cu composite joints mechanical properties gray relational analysis Taguchi method

Self-assembly Promoted Crystallization of Diblock Copolypeptoids in Solution

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Chinese Journal of Chemistry 2023年第18期41卷 2305-2310页

作者： Rongye Li Yue Zhao Min Lin Jing Sun State Key Laboratory of Supramolecular Structure and materials College of ChemistryJilin UniversityChangchunJilin 130012China Key Laboratory of Biobased Polymer materials Shandong Provincial Education DepartmentSchool of Polymer Science and EngineeringQingdao University of Scienceand TechnologyQingdaoShandong 266042China

Comprehensive Summary,Great efforts have been lately devoted to fabricating well-defined nanostructures using crystallization-driven self-assembly(CDSA)*** influence of self-assembly on crystallization is also of great ***,a series of amphiphilic diblock copolypeptoids poly(N-allylglycine)-b-poly(N-octylglycine)modified with cysteamine hydrochloride((PNAG-g-NH_(2))-b-PNOG)were synthesized by ring-opening polymerization(ROP)and post-polymerization *** diblock copolypeptoid is comprised of one hydrophobic crystalline PNOG block and one hydrophilic amorphous block,which can aggregate into nanostructured assemblies with soluble PNAG-g-NH_(2) as the corona layer and PNOG as the inner core in aqueous *** a systematic study by differential scanning calorimetry(DSC)and wide-angle X-ray scattering(WAXS),we demonstrated that the self-assembly of the block copolymers strengthens the crystallization of the PNOG block.

关键词： Copolymers Self-assembly Crystallization Ring-opening polymerization Microphase separation/Polypeptoids

Super-stable permittivity and low dielectric loss of(1-x)Na_(0.5)Bi_(0.5+y)TiO_(3-x)NaTaO_(3)ceramics within an ultra-wide temperature range

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Journal of Materiomics 2023年第3期9卷 482-491页

作者： Pengrong Ren Han Zhao Xin Wang Yuhui Wan Zhiyong Liu Changbai Long Fuxue Yan Till Frӧmling Gaoyang Zhao Shaanxi Province Key Laboratory for Electrical materials and Infiltration Technology School of Materials Science and EngineeringXi'an University of TechnologyXi'an710048China Laboratory of Thin Film Techniques and Optical Test School of Photoelectrical EngineeringXi'an Technological UniversityXi'an710032China School of materials Science and engineering Nanchang Hangkong UniversityNanchang330063China State Key Laboratory for Mechanical Behavior of materials Xi'an Jiaotong UniversityXi'an710049China Institute of materials Science Technische Universit€at DarmstadtFB Nichtmetallisch-Anorganische WerkstoffeAlarich-Weiss-Straße 2D-64287DarmstadtGermany

This work designs a new system(1-x)Na_(0.5)Bi_(0.5+y)TiO_(3-x)NaTaO_(3)with a nonstoichiometric bismuth ratio,which is used as dielectrics of ceramics *** structure evolution of(1-x)Na_(0.5)Bi_(0.5+y)TiO_(3-x)NaTaO_(3)is characterized using XRD,Raman and *** and resistant properties of(1-x)Na_(0.5)Bi_(0.5+y)TiO_(3-x)NaTaO_(3)are investigated with increasing concentration of NaTaO_(3).With these in-vestigations,the structure and defect chemistry of(1-x)Na_(0.5)Bi_(0.5+y)TiO_(3-x)NaTaO_(3)are rationalized and their respective impact on capacitor properties are *** optimized composition 0.8Na_(0.5)Bi_(0.51)TiO_(3)-0.2NaTaO_(3)possesses an ultra-wide operating temperature range(-92e398C),in which both stable permittivity and low dielectric loss is ***,the fabrication of multilayer ceramics capacitors(MLCC)based on 0.8Na_(0.5)Bi_(0.51)TiO_(3)-0.2NaTaO_(3)dielectrics is *** the addition of sintering aids,0.8Na_(0.5)Bi_(0.51)TiO_(3)-0.2NaTaO_(3)could be co-fired with Ag at 910℃in air,and the low temperature co-fired ceramic(LTCC)capacitors maintain good temperature stability of permittivity and low dielectric loss in-100-352℃.Therefore,our work provides a new route for pre-paring ultra-wide operating temperature capacitors at low manufacturing costs.

关键词： Na_(1/2)Bi_(1/2)TiO_(3) Permittivity Dielectric loss Ultra-wide operating temperature capacitors

Is it universal that the layered-spinel structure can improve electrochemical performance?

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Journal of Energy Chemistry 2022年第1期31卷 344-353,I0010页

作者： Daqiang Wang Zhenguo Wu Wei Xiang Yuxia Liu Gongke Wang Kanghui Hu Qi Xu Yang Song Xiaodong Guo College of Chemical engineering Sichuan UniversityChengdu 610065SichuanChina College of materials and Chemistry&Chemical engineering Chengdu University of TechnologyChengdu 610059SichuanChina The Key Laboratory of Life Organic Analysis Key Laboratory of PharmaceuticalSchool of Chemistry and Chemical EngineeringQufu Normal UniversityQufu 273165ShandongChina School of materials Science and engineering Henan Normal UniversityXinXiang 453007HenanChina

The introduction of spinel phase to form the layered-spinel structure(LSS)is an effective way to improve the electrochemical performance of Li-and Mn-rich layered oxides(LMR).But is this structure universal for all LMR systems?In this work,different Mn/Ni ratio systems with the LSS are discussed in *** is found that,high discharge capacity(200.8 mA h g^(-1) at 1C rate;1C=250 mA h g^(-1))as well as high capacity-retention(94%at 1C rate after 100 cycles)can be achieved by forming the LSS for low-Ni system(Mn/Ni=5.0).However,the capacity retention decreases severely in the high-Ni system(Mn/Ni=3.5,2.6).For example,when the ratio of Mn/Ni is 3.5,the capacity-retention of the layered-spinel sample was only 65.8%,compared to the 83%of the original LMR *** Ex-situ XRD,XPS,and HRTEM results demonstrate that the introduction of spinel phase in high-Ni system accelerates the transition and collapse of the crystal *** work provides guidance for optimizing the proportions of elements and the design of structures for the LMR.

关键词： Li-ion battery Li-and Mn-rich layered oxides Spinel phase Mn/Ni ratio

Additive manufacturing of sodalite monolith for continuous heavy metal removal from water sources

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Chinese Journal of Chemical engineering 2022年第2期35卷 82-90页

作者： Hengyu Shen Run Zou Yangtao Zhou Xing Guo Yanan Guan Duo Na Jinsong Zhang Xiaolei Fan Yilai Jiao Shenyang National Laboratory for materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China School of materials Science and engineering University of Science and Technology of ChinaShenyang 110016China department of Chemical engineering The University of ManchesterOxford RoadManchester M139PLUnited Kingdom Science and Technology on Vacuum Technology and Physics Laboratory Lanzhou Institute of PhysicsLanzhou 730010China

Herein,we present a simple strategy for preparing monolithic sodalite adsorbents via sequential additive manufacturing and *** detail,the method includes(i)3D printing of cylindrical monoliths using clay as the base material;(ii)thermal activation of the 3D-printed clay monoliths by calcination(to produce reactive alumina and silica species and enable mechanical stabilization);(iii)conversion of the activated clay monoliths to hierarchical porous sodalite monoliths via hydrothermal alkaline *** studies on the effect of calcination temperature,alkaline concentration and hydrothermal treatment time on the property of the resulting materials(such as phase composition and morphology)at different stages of preparation was *** the optimal conditions(i.e.,calcination temperature of 850℃,NaOH concentration of 3.3 mol·L^(-1),reaction temperature of 150℃,and reaction time of 6 h),a high-quality pure sodalite monolith was obtained,which possesses a relatively high BET surface area(58 m^(2)·g^(-1))and hierarchically micro-meso-macroporous *** the proposed application of continuous removal of heavy metals(chromium ion as the model)from wastewater,the developed 3D-printed sodalite monolith showed excellent Cr^(3+)removal performance and fast kinetics(~98%removal efficiency within 25 cycles),which outperformed the packed bed using sodalite pellets(made by extrusion).

关键词： Additive manufacturing Clay Sodalite monolith Heavy metal removal

Deformation-induced interfacial-twin-boundary ω-phase in an Fe_(48)Mn_(37)Al_(15) body-centered cubic metastable alloy

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Journal of materials Science & Technology 2023年第15期146卷 252-258页

作者： Huabei Peng Xiao Yang Lixin Sun Liqiu Yong Jiazhen Yan Jinyong Zhang Bingnan Qian Yuhua Wen School of Mechanical engineering Sichuan UniversityChengdu 610065China School of Mechanical engineering Hebei University of TechnologyTianjin 300401China State Key Laboratory of materials Processing and Die and Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China School of materials and Physics China University of Mining and TechnologyXuzhou 221116China State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China Innovation Center NPU ChongqingChongqing 401135China department of Mechanical and Energy engineering Southern University of Science and TechnologyShenzhen 518055China

Omega(ω)phase has a trigonal or hexagonal crystal structure and was first discovered inβ-type Ti-Cr alloys[1].Since then,theω-phase has been widely reported in numerous group IV transition metal(Ti,Ta,Hf,and Zr)based alloys[2–9].The morphologies ofω-phase could be particle-like(athermalω-phase)[10],ellipsoidal or cuboidal after aging(isothermalω-phase)[11],and plate-like after deformation(stress-relatedω-phase)[12].Amongst,the stressrelatedω-phase is usually located at the twinning boundary,thus also called interfacial-twin-boundary-ω(ITB-ω)*** formation of the ITB-ωphase is considered to be related to the formation of{112}bccmechanical twin(i.e.,{112}bcc twin)in bodycentered cubic(BCC)metals and alloys[13].

关键词： alloys alloy deformation

Highly strengthening and toughening biomimetic ceramic structures fabricated via a novel coaxially printing

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Journal of Advanced ceramics 2024年第4期13卷 403-412页

作者： Kunkun Song Shengda Yang Ningqi Shao Yantang Zhao Peng He Yongfeng Wei Hengzhong Fan Yongsheng Zhang Qiangqiang Zhang State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou 730000China School of Civil engineering and Mechanics Lanzhou UniversityLanzhou 730000China Key Laboratory of Mechanics on Disaster and Environment in Western China(Lanzhou University) Ministry of EducationLanzhou 730000.China

Additive manufacturing technology,by manipulating and emulating inherent multiscale,multi-material,and multifunctional structures found in nature,has created new opportunities for constructing heterogeneous structures associated with special properties and achieving ultra-high mechanical performance and reliability in ceramic composite *** this study,we have developed an innovative fabrication method designated as coaxial 3D printing for the synchronous construction of two constituents into ceramic composites with a tooth enamel biomimetic ***,the stiff silicate and flexible epoxy served as a strengthening bridge and toughening layer,*** method differed from the traditional approach of randomly dispersing reinforcing components within a ceramic *** allowed for the direct creation of an internally effective three-dimensional reinforcement network structure in ceramic *** process facilitated synergistic deformation and simultaneous enhancement of multiple materials and hierarchical *** to the uniform distribution of internal stress and effective block of microcrack propagation,the biomimetically structured silicate/epoxy ceramic composite has demonstrated much significant enhancement in mechanical properties,includingcompressive strength(48.8±3.12MPa),flexuralstrength(10.39±1.23MPa),andflexuraltoughness(218.7±54.6kJ/m^(3)),which was 0.5,2.1,and 47.5 times as high as those of the intrinsic brittle silicate ceramics,***-situ characterization and multiscale finite element simulation of microstructural evolution during three-point bending deformation further validated multiple-step features of the fracture process(silicate bridge fracture,interface detachment,epoxy extraction,and rupture),which benefited from interpenetrating structural features achieved by coaxial printing to accomplish with the complex propagating routines of the crack deflection in silicate ceramic *** coaxia

关键词： coaxial 3D printing silicate ceramic composites enamel biomimetic microstructure strengthening bridge tougheninglayer crackdeflection