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High mechanical strength Si anode synthesis with interlayer bonded expanded graphite structure for lithium-ion batteries

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Journal of Energy Chemistry 2024年第6期93卷 253-263,I0007页

作者： Wenhui Lai Jong Hak Lee Lu Shi Yuqing Liu Yanhui Pu Yong Kang Ong Carlos Limpo Ting Xiong Yifan Rao Chorng Haur Sow Barbaros Ozyilmaz Department of Material Science&Engineering National University of SingaporeSingapore 117575Singapore Center for Advanced 2D Materials National University of SingaporeSingapore 117546Singapore Department of Physics National University of SingaporeSingapore 117551Singapore Institute forFunctional Intelligent Materials National University of SingaporeSingapore 117544Singapore

Despite advancements in silicon-based anodes for high-capacity lithium-ion batteries,their widespread commercial adoption is still hindered by significant volume expansion during cycling,especially at high active mass loadings crucial for practical *** root of these challenges lies in the mechanical instability of the material,which subsequently leads to the structural failure of the ***,we present a novel synthesis of a composite combining expanded graphite and silicon *** composite features a unique interlayer-bonded graphite structure,achieved through the application of a modified spark plasma sintering ***,this innovative structure not only facilitates efficient ion and electron transport but also provides exceptional mechanical strength(Vickers hardness:up to658 MPa,Young's modulus:11.6 GPa).This strength effectively accommodates silicon expansion,resulting in an impressive areal capacity of 2.9 mA h cm^(-2)(736 mA h g^(-1)) and a steady cycle life(93% after 100cycles).Such outsta nding performance is paired with features appropriate for large-scale industrial production of silicon batteries,such as active mass loading of at least 3.9 mg cm^(-2),a high-tap density electrode material of 1.68 g cm^(-3)(secondary clusters:1.12 g cm^(-3)),and a production yield of up to 1 kg per day.

关键词： Lithium-ion battery Silicon anode Spark plasma sintering Interlayer bonding mechanical strength Tap density

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Enhancing the Interaction of Carbon Nanotubes by Metal-Organic Decomposition with Improved mechanical strength and Ultra-Broadband EMI Shielding Performance

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Nano-Micro Letters 2024年第7期16卷 281-294页

作者： Yu-Ying Shi Si-Yuan Liao Qiao-Feng Wang Xin-Yun Xu Xiao-Yun Wang Xin-Yin Gu You-Gen Hu Peng-Li Zhu Rong Sun Yan-Jun Wan Shenzhen Institute of Advanced Electronic Materials Shenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen 518055People’s Republic of China Southern University of Science and Technology Shenzhen 518055People’s Republic of China National Key Laboratory of Materials for Integrated Circuits Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050People’s Republic of China

The remarkable properties of carbon nanotubes(CNTs)have led to promising applications in the field of electromagnetic inter-ference(EMI)***,for macroscopic CNT assemblies,such as CNT film,achieving high electrical and mechanical properties remains challenging,which heavily depends on the tube-tube interac-tions of ***,we develop a novel strategy based on metal-organic decomposition(MOD)to fabricate a flexible silver-carbon nanotube(Ag-CNT)*** Ag particles are introduced in situ into the CNT film through annealing of MOD,leading to enhanced tube-tube *** a result,the electrical conductivity of Ag-CNT film is up to 6.82×10^(5) S m^(-1),and the EMI shielding effectiveness of Ag-CNT film with a thickness of~7.8μm exceeds 66 dB in the ultra-broad frequency range(3-40 GHz).The tensile strength and Young’s modulus of Ag-CNT film increase from 30.09±3.14 to 76.06±6.20 MPa(~253%)and from 1.12±0.33 to 8.90±0.97 GPa(~795%),***,the Ag-CNT film exhibits excellent near-field shield-ing performance,which can effectively block wireless *** innovative approach provides an effective route to further apply macroscopic CNT assemblies to future portable and wearable electronic devices.

关键词： EMI shielding mechanical strength Carbon nanotubes Metal-organic decomposition Flexibility

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mechanical strength of soda-lime glass sandblasted by gravitation

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Friction 2015年第1期3卷 65-71页

作者： Fouad ROUMILI Saci BENBAHOUCHE Jean-Christophe SANGLEBOEUF Laboratoire de Mécanique de Précision Appliquée Institut d’Optique et Mécanique de PrécisionUniversitéFerhat AbbasSétif19000Algérie Institut de Physique de Rennes UMR CNRS 6251 Bât.10BCampus de Beaulieu35042 Rennes cedexFrance

Damage to a glass surface by sandblasting has a remarkable effect on its mechanical properties and *** this study,we analyze the superficial deterioration of soda-lime glass and its influence on the mechanical *** by gravitation from a fixed height causes damages by the free fall of different quantities of sand,which we performed for a selected grain size and at different angles of *** characterize the surface state,we used different roughness measures(the arithmetic mean value of the roughness Ra,the root mean square roughness Rq,and the maximum roughness Rmax)and measured the optical transmission(transmittance)at different points on the specimen surface using a *** determine the mechanical strength,we proceeded by two methods:first,by a shock ball(falling ball),and then by biaxial bending using circular *** effects of the surface damage on the optical transmission and the mechanical strength of the glass are graphically presented and discussed in this paper.

关键词： sandblasting mechanical strength roughness soda lime glass

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Simultaneously realizing good volumetric entropy change and mechanical strength of La_(0.8)Ce_(0.2)Fe_(11.51)Mn_(0.19)Si_(1.3)H_(y) plates

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Journal of Rare Earths 2023年第10期41卷 1568-1573,I0004页

作者： Juan Cheng Caiyin You Bo Li Yaru Guo Zhaojie Li Lei Gao Pengyu Wang School of Materials Science and Technology Xi'an University of TechnologyXi'an710048China State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization Baotou Research Institute of Rare EarthsBaotou014030China

It is hard to get a high-strength La(Fe,Si)_(13)-based hydrides owing to the brittle feature of *** this work,we fabricated the La_(0.8)Ce_(0.2)Fe_(11.51)Mn_(0.19)Si_(1.3)plates through hot pressing at 1323 K for various ***,the saturated hydrogenization is achieved at 593 K in H_2 atmosphere of 0.13 MPa for 210 *** microstructure and magnetocaloric properties were investigated by an X-ray diffractometer,a scanning electron microscope and the *** magnetic fields of 0-2 T,the maximal volumetric entropy change is 91.4 mJ/(cm^(3)·K)at 297 K for the hydride *** hydride plate simultaneously has excellent mechanical properties with the maximum bending strength of 213 MPa,which suggest that the hot pressing followed by hydrogenation could be an effective route of fabricating La(Fe,Si)_(13)-based hydrides for the potential application in the magnetic refrigerator.

关键词： Magnetocaloric effect mechanical strength Volumetric entropy change Hot-pressing Rare earths

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IMPROVED OXYGEN PERMEABILITY AND mechanical strength OF SILICONE HYDROGELS WITH INTERPENETRATING NETWORK STRUCTURE

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Chinese Journal of Polymer Science 2010年第6期28卷 849-857页

作者： Jing-jing Wang Xin-song Li Biomaterials and Drug Delivery Laboratories School of Chemistry and Chemical EngineeringSoutheast UniversityNanjing 211189China

The interpenetrating polymer network(IPN) silicone hydrogels with improved oxygen permeability and mechanical strength were prepared by UV-initiated polymerization of monomers including methacryloxypropyl tris(trimethylsiloxy)silane(TRIS),2-hydroxyethylmethacrylate(HEMA) and N-vinyl pyrrolidone(NVP) in the presence of free radical photoinitiator and cationic *** polymerization mechanism was investigated by the formation of gel *** structure of IPN hydrogels was characterized by Fourier transform infrared spectroscopy(FTIR), differential scanning calorimetry(DSC) and transmission electron microscopy(TEM).The results showed that the IPN hydrogels exhibited a heterogeneous *** mechanical properties,surface wettability and oxygen permeability were examined by using a tensile tester,a contact angle goniometer and an oxygen transmission tester,*** equilibrium water content of the hydrogels was measured by the gravimetric *** results revealed that the IPN hydrogels possessed hydrophilic surface and high water *** exhibited improved oxygen permeability and mechanical strength because of the incorporation of TRIS.

关键词： Interpenetrating polymer network Silicone hydrogel Photopolymerization Oxygen permeability mechanical strength

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Poly(m-phenylene isophthalamide)-reinforced polyethylene oxide composite electrolyte with high mechanical strength and thermostability for all-solid-state lithium metal batteries

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Rare Metals 2022年第11期41卷 3762-3773页

作者： Ya-Ning Liu Zhen Xiao Wen-Kui Zhang Jun Zhang Hui Huang Yong-Ping Gan Xin-Ping He G.Gnana Kumar Yang Xia College of Materials Science and Engineering Zhejiang University of TechnologyHangzhou310014China Institute of Optoelectronic Materials and Devices China Jiliang UniversityHangzhou310018China Department of Physical Chemistry School of ChemistryMadurai Kamaraj UniversityMadurai625021India

Polyethylene oxide(PEO)-based solid polymer electrolytes(SPEs)with flexibility,easy processability,low cost and especially strong ability to dissolve lithium salts have been regarded as promising alternatives to traditional flammable liquid electrolytes in next-generation highsafety and high-energy-density lithium metal ***,the inferior mechanical strength and thermostability of PEO-based SPEs will raise the lithium dendritic penetration issue,further leading to the short circuit in *** this work,aiming at enhancing the interfacial stability against Li dendrites of PEO-based SPEs,poly(mphenylene isophthalamide)(PMIA)is introduced as a reinforcing phase for the rational design of PEO/PMIA composite ***,PMIA chain with meta-type benzene-amide linkages significantly improves the mechanical strength(1.60 MPa),thermal stability(260℃)and ability to inhibit the growth of lithium dendrites(>300 h at 0.1 mA·cm^(-2))of ***,allsolid-state LiFePO_(4)‖PEO/PMlA‖Li cell demonstrates superior electrochemical performance in terms of high specific capacity(159.1 mAh·g^(-1)),remarkable capacity retention(82.2%after 200 cycles at 0.5 C)and excellent safety *** burning or explosion occurs under pressing,bending and cutting *** work opens a new door in developing high-performance PEObased electrolytes for advanced all-solid-state lithium metal batteries.

关键词： Poly(m-phenylene isophthalamide) Polyethylene oxide Solid electrolyte mechanical strength Thermal stability All-solid-state lithium metal battery

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Ultra-lightweight ceramic scaffolds with simultaneous improvement of pore interconnectivity and mechanical strength

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Journal of Materials Science & Technology 2023年第6期137卷 247-258页

作者： Ye Dong Annan Chen Ting Yang Shuai Gao Shuning Liu Hongyi Jiang Yusheng Shi Chenglong Hu School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Engineering Research Center of Ceramic Materials for Additive Manufacturing Ministry of EducationWuhan 430074China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China

The high porosity and interconnectivity of scaffolds are critical for nutrient transmission in bone tis-sue engineering but usually lead to poor mechanical ***,a novel method that combines acid etching(AE)with selective laser sintering(SLS)and reaction bonding(RB)of Al particles is pro-posed to realize highly improved porosity,interconnectivity,mechanical strength,and in vitro bioactivity in 3D Al_(2)O_(3) *** controlling the oxidation and etching behaviors of Al particles,a tunable hol-low spherical feature can be obtained,which brings about the distinction in compressive response and fracture *** prevention of microcrack propagation on the in situ formed hollow spheres results in unique near elastic buckling rather than traditional brittle fracture,allowing an unparalleled compressive strength of 3.72±0.17 MPa at a high porosity of 87.7%±0.4%and pore interconnectivity of 94.7%±0.4%.Furthermore,scaffolds with an optimized pore structure and superhydrophilic surface show excellent cell proliferation and adhesion *** findings offer a promising strategy for the coexistence of out-standing mechanical and biological properties,with great potential for tissue engineering applications.

关键词： Ceramic scaffolds Selective laser sintering Acid etching Hollow spherical feature mechanical strength In vitro bioactivity

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The effect of al particle size on thermal decomposition,mechanical strength and sensitivity of Al/ZrH_(2)/PTFE composite

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Defence Technology（防务技术） 2021年第3期17卷 829-835页

作者： Jun Zhang Yu-chun Li Jun-yi Huang Jia-xiang Wu Qiang Liu Shuang-zhang Wu Zhen-ru Gao Sheng Zhang Li Yang College of Field Engineering PLA Army Engineering UniversityNanjing210007China

To study the thermal decomposition of Al/Zr H_(2)/PTFE with different Al particle size as well as mechanical strength and impact sensitivity under medium and low strain rates,molding-vacuum sintering was adopted to prepare four groups of power materials and cylindrical specimens with different Al particle *** active decomposition temperature of Zr H_(2) was obtained by TG-DSC,and the quasi-static mechanics/reaction characteristics as well as the impact sensitivity of the specimen were studied respectively by quasi-static compression and drop-hammer *** results show that the yield strength of the material decreased with the increase of the Al particle size,while the compressive strength,failure strain and toughness increased first and then decreased,which reached the maximum values of 116.61 MPa,191%,and 119.9 MJ/m respectively when the Al particle size is 12-14 mm because of particle size *** specimens with the highest strength and toughness formed circumferential open cracks and reacted partly when *** with developmental cracks formed inside did not *** is considered that fracture of specimens first triggered initial reaction between Al and PTFE to release an amount of *** ZrH_(2) was activated and decomposed,and participated in subsequent reaction to generate Zr *** impact sensitivity of the specimens decreased with the increase of Al particle size.

关键词： Al/ZrH_(2)/PTFE Thermal decomposition mechanical strength Reaction characteristics Impact sensitivity

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Effects of Cure Pressure Induced Voids on the mechanical strength of Carbon/Epoxy Laminates

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Journal of Materials Science & Technology 2005年第1期21卷 87-91页

作者： Ling LIU, Boming ZHANG, Zhanjun WU and Dianfu WANGCenter for Composite Materials, Harbin Institute of Technology, Harbin 150001, ChinaProf., Ctr. for Composite Mat. Harbin Inst. of Technol. Harbin 150001 China

This work aims at designing a set of curing pressure routes to produce laminates with various void contents. The effects of various consolidation pressures resulting in different void contents on mechanical strength of carbon/epoxy laminates have been examined. Characterization of the voids, in terms of void volume fraction, void distribution, size, and shape, was performed by standard test, ultrasonic inspection and metallographic analysis. The interlaminar shear strength was measured by the short-beam method. An empirical model was used to predict the strength vs porosity. The predicted strengths conform well with the experimental data and voids were found to be uniformly distributed throughout the laminate.

关键词： Carbon/epoxy laminates Autoclave curing Void mechanical strength

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Investigation on Thermal Insulation and mechanical strength of Lightweight Aggregate Concrete and Porous Mortar in Cold Regions

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Journal of Renewable Materials 2022年第12期10卷 3167-3183页

作者： Jianan Wu Ke Xue Zhaowei Ding Lei Lang Kang Gu Xiaolin Li Mingli Zhang Desheng Li Ningbo City College of Vocational Technology NingboChina College of Water Conservancy and Hydropower Engineering Sichuan Agricultural UniversityYa’anChina State Key Laboratory of Ocean Engineering Shanghai Jiao Tong UniversityShanghaiChina College of Civil Engineering and Architecture Jiaxing UniversityJiaxingChina Department of Civil Engineering Lanzhou University of TechnologyLanzhouChina Department of Civil Engineering College of ScienceNanjing University of Science and TechnologyNanjingChina

Thermal insulation is an important indicator to evaluate the construction material in cold region *** we know,adding the industrial waste as lightweight aggregate or creating the pore inside the cement-based composite could make the texture loose,and the thermal insulating capacity of the material would be improved with this *** these methods,the industrial by-product and engineering waste could be cycled in an efficient ***,after service the fragmented cement composites paste could be used as aggregate in the thermal insulating concrete *** the porous texture is not favorable for the mechanical strength and long-term durability in a cold *** balance the above three requirements from two opposite directions,different processing methods were applied to create the thermal insulation concrete/***,the organic/inorganic lightweight aggregate,including the Expanded Polystyrene(EPS),Expanded Perlite(EP),and Ceramsite(CRMST)particles,were applied to create the Lightweight Aggregate Concrete(LWAC).As the comparative tests,the expanded Superabsorbent Polymer(SAP)hydrogel and Air-Entraining Agent(AEA)were also introduced to create the porous *** above concrete/mortar was tested in the normal state and under the Freeze-Thaw cycle to explore the engineering performance in cold *** the experimenting process,the thermal insulation,mechanical strength,and frost resistance of these cement-based composites were investigated,and an optimal thermal insulation concrete/mortar was determined.

关键词： Thermal insulation mechanical strength cement-based composite freeze-thaw cycle frost resistance

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