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In-Situ Derived Ti3C2Tx MXene/TiO2 Modified Cu Foil Combining Abundant Nucleation Sites and Favorable Conductivity for Stable Lithium Metal Batteries

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SSRN 2024年

作者： Liu, Yong Wang, Fei Gao, Jingxia Yang, Delin Li, Haoming Zhang, Jinping Liu, Jie Ren, Fengzhang Faculty of Engineering Huanghe Science & Technology University Henan Zhengzhou450006 China School of Materials Science and Engineering Henan University of Science and Technology Provincial and Ministerial Co-construction of Collaborative Innovation Center for Non-ferrous Metal New Materials and Advanced Processing Technology Luoyang471023 China Henan Key Laboratory of Non-Ferrous Materials Science & Processing Technology Luoyang471023 China

The uneven lithium deposition on Cu current collector and poor interface stability of lithium metal/electrolyte would lead to rapid capacity decay and potential safety risks, which severely hinder the practical applications of lithium metal batteries. In this work, the in-situ derived Ti3C2Tx MXene/TiO2 (labeled as MXene/TiO2) composite with favorable lithiophilicity and conductivity is applied as modified layer on Cu foil current collector (labeled as MXene/TiO2@Cu) to obtain the uniform and dense lithium plating. Compared with bare Cu and commercial TiO2 nanoparticles modified Cu current collector (labeled as Nano TiO2@Cu), the MXene/TiO2@Cu combines abundant lithium nucleation sites and improved conductivity, which could promote uniform lithium plating and stripping at high current density and effectively avoid the generation of dead lithium or lithium dendrites. As a result, the MXene/TiO2@Cu-based symmetric battery could cycle stably for 2000 h at high current density of 3 mA cm−2 with high capacity of 3 mAh cm−2, and the MXene/TiO2@Cu-Li⃦LiFePO4 full battery could maintain the high reversible capacity of 104.0 mAh g−1 at 1 C after 500 cycles. This work provides an effective and novel protection strategy for Cu current collector, which is critical for the design of lithium metal batteries with favorite rate performance at high current density and long cycling life. © 2024, The Authors. All rights reserved.

关键词： Titanium dioxide

Dual Lithiophilic Li2O@LiZn Sites Towards Practical Lithium Metal Batteries

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SSRN 2025年

作者： Wu, Heng Tan, Hongming Wu, Shijie Wang, Jiajia Li, Yuting Yang, Li Xu, Xupeng Su, Jincang Xu, Guobao Huang, Jianyu Xu, Beibei Liang, Yaru Wang, Gang Hunan Provincial Key laboratory of Thin Film Materials and Devices School of Material Sciences and Engineering Xiangtan University Xiangtan411105 China Hunan Provincial Key Laboratory of Advanced Materials for New Energy Storage and Conversion Hunan University of Science and Technology Hunan411201 China State Key Laboratory of Materials for Integrated Circuits Shanghai Institute of Microsystem and Information Technology Shanghai200050 China

Lithium metal anode is regarded as the "holy grail" of anode materials for Li-metal batteries (LMBs) because of its ultrahigh-specific capacity. However, the uncontrollable growth of "hostless" Li dendrite in the Li anode has a vital impact on its practical applications. Herein, the ultra-lightweight 3D carbon fiber is proposed to construct a Li metal anode via molten Li infusion with the aid of ZnO nano-coral. The atom probe tomograph (APT) manifests that the Li can be doped into Zn at the atomic scale and form Li2O on ZnO nano-coral, realizing a strong lithiophilic interface for uniform Li deposition. The in-situ TEM and DFT calculation confirms that the formed LiZn/Li2O not only acts as nucleation sites for lowering the Li diffusion barrier but also improves interfacial ionic conductivity for homogenizing Li-ion flux. As a result, the Li2O@LiZn-LCF@Li anode exhibits excellent cycle stability over 400 h under ultrahigh Li utilization of 70.7%. The full cell paired with LiFePO4 delivers a high discharge capacity of 142.9 mAh g−1 and maintains a high-capacity retention of 93.3% after 100 cycles under a harsh condition of low N/P (2.08). The strategy provides a broad prospect for developing composite metal anodes in practical high-energy-density LMBs. © 2025, The Authors. All rights reserved.

关键词： Zinc oxide

Enhanced Ablation Resistance of Carbon Fiber Reinforced Phenolic Composites Through Designing In-Plane Heat Conduction And Out-of-Plane Heat Insulation Channels

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SSRN 2024年

作者： Chen, Xiang Shi, Kui Gu, Ziwen Quan, Huafeng Huang, Dong Zhang, Yuefeng Li, Tongqi Ye, Chong Fan, Zhen Zhu, Shipeng Liu, Jinshui Peng, Chaoyi Tao, Lei College of Materials Science and Engineering Hunan Province Key Laboratory for Advanced Carbon Materials and Applied Technology Hunan University Changsha410082 China Hunan Province Engineering Research Center for High Performance Pitch-based Carbon Materials Hunan Toyi Carbon Material Technology Co. Ltd. Changsha410000 China Key Laboratory of Advanced Functional Composite Materials Aerospace Research Institute of Materials and Processing Technology Beijing100076 China State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body Hunan University Changsha410082 China Zhuzhou Times New Material Technology Co. Ltd. Zhuzhou412007 China China Academy of Launch Vehicle Technology China

With the development of near-space vehicles toward higher Mach speeds, the aerodynamic heating problem poses an increasingly serious challenge to thermal protection system, and thus it is urgent to further improve the ablation resistance of carbon fiber reinforced phenolic resin (CF/PR). To achieve this, an innovative composite was prepared using mesophase-pitch-based carbon fiber as a reinforcement to construct the in-plane heat transfer channels. The thermal conductivities of composite in in-plane (λi) and out-of-plane (λo) directions were 24.37 W·m-1·K-1 and 0.96 W·m-1·K-1, respectively, and the ratio(λi/λo) is up to 25.39, which plays a positive role in enhancing the heat dissipation of ablation center while maintaining effective interlayer insulation. During ablation, the composite exhibits a 159 °C lower stagnation-point temperature compared to the control group, and the maximum and average temperature on its backside decrease 196 °C and 201 °C, respectively. Consequently, the mass ablation rate and the line ablation rate of composite are reduced by 72.5% and 87.6%, respectively. The anisotropic thermal behavior and higher λi/λo value contribute to the decrease of the stagnation-point temperature, the maximum temperature and the average temperature on the backside, thereby improving the ablation resistance of composite. © 2024, The Authors. All rights reserved.

关键词： Ablation

3D printing of (Cf-Csf)/ZrB2-SiC composites through coextrusion of flexible pre-infiltrated Cf/ZrB2 fiber bundle and Csf/ZrB2 paste

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Ceramics International 2025年

作者： Zhang, Yixin Cheng, Yehong Fang, Jinming Ma, Denghao Sun, Xin Li, Junping An, Yumin Hu, Ning Zhao, Libin School of Mechanical Engineering Hebei University of Technology Tianjin300401 China Ministry of Education Tianjin300401 China Key Laboratory of Hebei Province on Scale-span Intelligent Equipment Technology Tianjin300401 China Chongqing Science Innovation Center Hebei University of Technology Chongqing401135 China Science and Technology of Advanced Functional Composite Materials Laboratory Aerospace Research Institute of Materials and Processing Technology Beijing100076 China State Key Laboratory of Reliability and Intelligence Electrical Equipment Hebei University of Technology Tianjin300401 China

This work addresses two major challenges in 3D printed ceramic composites: inadequate ceramic matrix infiltration in fiber bundles and the lack of optimized fiber-matrix interfaces. We developed a breakthrough fabrication strategy featuring: A tailored flexible carbon coating specifically designed for 3D printing applications, deposited on carbon fibers to create a suitable interface;A specialized pre-infiltration method enabling uniform ceramic slurry distribution in continuous carbon fiber bundles;and A unique co-extrusion process combining flexible pre-infiltrated Cf/ZrB2 bundles with Csf/ZrB2 paste. The resulting (Cf-Csf)/ZrB2-SiC composites, fabricated through multi-cycle precursor infiltration-pyrolysis, demonstrate remarkable mechanical properties (flexural strength: 237.6 MPa;fracture toughness: 7.30 MPa m1/2) and exceptional ablation resistance (enduring 2190 °C surface temperatures for 1320 s in wind tunnel testing). This work establishes a new paradigm for manufacturing ultra-high temperature ceramic composites with simultaneously enhanced mechanical and thermal performance. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Fracture toughness

Enhanced Graphitization and Reduced Radial Heterogeneity of Carbon Fibers Inheriting from Photo/Thermo-Chemically Stabilized Pan-Fibers

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SSRN 2024年

作者： Ma, Tianshuai Shao, Ruiqi Wang, Wei Liu, Shengkai Min, Chunying Jiang, Wanwei Li, Tianyu Xu, Zhiwei State Key Laboratory of Separation Membranes and Membrane Processes School of Textile Science and Engineering Tiangong University Tianjin300387 China Research School of Polymeric Materials School of Materials Science & Engineering Jiangsu University Jiangsu Zhenjiang212013 China Jiangsu Advanced Textile Engineering Technology Center Jiangsu College of Engineering and Technology Jiangsu 226007 China

The cross-section of carbon fibers (CFs) possessed radial heterostructure, which restricted its mechanical properties. In this paper, heating and γ-irradiation were integrated during stabilization process to improve the radial structure of CFs. The cooperation of irradiation and heating during stabilization caused the decrease of ID/IG, increase of crystal size, and reduction of pore fractal dimension in whole CFs. Through Raman spectra along fibers cross-section, a radial heterogeneity was found during the whole carbonization process. The cooperation of γ-irradiation and heating during stabilization reduced ID/IG on cross-section and weakened radial heterogeneity of CFs. The cooperation of γ-irradiation and heating during stabilization significantly enhanced the tensile strength of CFs. Subsequently, a hierarchy model containing outer-surface, sub-surface and core parts was presented to explain the evolution of tensile strength for CFs. The γ-irradiation during stabilization enhanced the structure of each part in CFs by generating more cross-linked structures. © 2024, The Authors. All rights reserved.

关键词： Irradiation

advanced Li-SexSy battery system:Electrodes and electrolytes

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Journal of materials Science & technology 2020年第20期52卷 1-15页

作者： Huan Du Shihao Feng Wen Luo Liang Zhou Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing International School of Materials Science and EngineeringWuhan University of TechnologyWuhan430070China Department of Physics School of ScienceWuhan University of TechnologyWuhan430070China

The worldwide energy shortage has led to numerous researches for the exploration of new-type battery materials to deal with the energy *** achieve a great leap in energy density,the study of high capacity electrode materials plays a major *** a replacement to the energy accumulation system of lithium-sulfur(Li-S) and lithium-selenium(Li-Se) batteries,great concern is generated over lithium/selenium-sulfur(Li-SexSy) batteries as they combine the advantages of S(high capacity) and Se(improved electrical conductivity),consequently stands for extensive new cathode *** recent years,widespread researches have been conducted and great achievements have been *** review sums up the research status on Li-SexSy batteries and concentrates on the outstanding work of SexSy cathode *** reaction mechanism and capacity fading mechanism are *** performance-structure relationship is stated in regard of different cathode structures,including a variety of carbon hosts,conducting polymer hosts,transition metal-doped carbon electrodes and various Se/S *** compatibilities of frequently-used carbonate-based and ether-based electrolyte and other new-type electrolytes for Li-SexSy battery are *** for the future developments of Li-SexSy batteries are finally proposed.

关键词： Selenium-sulfur Cathode materials Electrolytes Lithium-sulfur

Perspectives and challenges for lead-free energy-storage multilayer ceramic capacitors

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Journal of advanced Ceramics 2021年第6期10卷 1153-1193页

作者： Peiyao ZHAO Ziming CAI Longwen WU Chaoqiong ZHU Longtu LI Xiaohui WANG State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China School of Material Science and Physics China University of Mining and TechnologyXiizhou 221116China College of Electrical Engineering Sichuan UniversityChengdu 610065China

The growing demand for high-power-density electric and electronic systems has encouraged the development of energy-storage capacitors with attributes such as high energy density,high capacitance density,high voltage and frequency,low weight,high-temperature operability,and environmental *** with their electrolytic and film counterparts,energy-storage multilayer ceramic capacitors(MLCCs)stand out for their extremely low equivalent series resistance and equivalent series inductance,high current handling capability,and high-temperature *** characteristics are important for applications including fast-switching third-generation wide-bandgap semiconductors in electric vehicles,5G base stations,clean energy generation,and smart *** have been numerous reports on state-of-the-art MLCC energy-storage ***,lead-free capacitors generally have a low-energy density,and high-energy density capacitors frequently contain lead,which is a key issue that hinders their broad *** this review,we present perspectives and challenges for lead-free energy-storage ***,the energy-storage mechanism and device characterization are introduced;then,dielectric ceramics for energy-storage applications with aspects of composition and structural optimization are *** on state-of-the-art energy-storage MLCCs is discussed after elaboration of the fabrication process and structural design of the *** applications of energy-storage MLCCs are then discussed in terms of advanced pulsed power sources and high-density power converters from a theoretical and technological point of ***,the challenges and future prospects for industrialization of lab-scale lead-free energy-storage MLCCs are discussed.

关键词： multilayer ceramic capacitors(MLCCs) lead-free dielectric ceramics energy storage high power density

Effects of AlCoCrFeNiTi high-entropy alloy on microstructure and mechanical properties of pure aluminum

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Journal of materials Science & technology 2020年第17期52卷 1-11页

作者： Qinglin Li Shang Zhao Xuepeng Bao Yushi Zhang Yuqian Zhu Chuangzao Wang Yefeng Lan Yuxin Zhang Tiandong Xia School of Materials Science and Engineering Lanzhou University of TechnologyLanzhou 730050China State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals Lanzhou University of TechnologyLanzhou 730050China

A new kind of AlCoCrFeNiTi high-entropy alloy(HEA)as a grain refiner was prepared by vacuum arc *** this work,the effects of HEA(1.0 wt.%,2.0 wt.%and 3.0 wt.%)on the microstructure and mechanical properties of pure aluminum were *** microstructure was characterized and examined by scanning electron microscope(SEM),energy dispersive X-ray spectroscopy(EDS),X-ray diffraction(XRD),electron probe micro-analyzer(EPMA)and transmission electron microscopy(TEM)to indicate the refining abilities and mechanism of HEA on pure *** show that the addition of HEA refined both the macrostructure and microstructure of pure *** 1.0 wt.%HEA was added,most coarse columnar grains were refined into equiaxed crystals,and as the amount of HEA increased to 2.0 wt.%and3.0 wt.%,aluminum grains were further refined,and the grain boundaries were nearly ***,the morphology ofα-Al transformed from coarse columnar crystals to equiaxed grains,and the mean size ofα-Al grains decreased from 374μm to 27μ*** Al3Ti,Al3Ni,and nano-phase precipitated from the aluminum alloy with HEA in the *** typical rod-like nano-phases distributed interdendritic regions ofα-*** average length of nano-phases is 2568 nm,4372 nm,and 6907 nm and the average diameter is 112 nm,103 nm,and 92 nm when 1.0 wt.%,2.0 wt.%and 3.0 wt.%HEA were added to the pure aluminum,*** ultimate tensile strength(UTS)and yield strength(YS)were improved in all samples,whereas the elongation(El)was decreased with increasing HEA *** 3.0 wt.%HEA was added into the aluminum melt,the UTS was improved by 145.2%from62 MPa to 152 MPa,the YS was increased by 173.8%from 42 MPa to 115 MPa,and the El was decreased by 33.3%from 39%to 26%.

关键词： Pure aluminum High-entropy alloy α-Al phases Nano-phases Mechanical properties

Microstructural Evolution of Defects Under Proton Irradiation in Porous Cu

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SSRN 2023年

作者： Li, Honglin Wang, Hao Wen, Pin Huang, Zhifeng Yin, Guanchao Chen, Fei Hubei Longzhong Laboratory Xiangyang441106 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China International School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics School of Science Wuhan University of Technology Wuhan430070 China Wuhan University of Technology China

The high specific strength and exceptional thermal insulating properties of porous metals make them an ideal choice for aerospace structural components and thermal insulation materials. However, in the space environment, proton irradiation leads to the formation of voids, bubbles, and dislocation loops, significantly compromising their physical and mechanical properties. To date, there has been limited attention to the radiation resistance properties in research related to porous metals. This study conducted proton irradiation experiments with a total dose of 1×1017 ions/cm2 on porous Cu. This study discusses and explains the irradiation-induced damage characteristics on the surface of porous Cu before and after proton irradiation. This provides insights into the radiation damage mechanisms within the porous Cu ligaments and the hydrogen release behavior on the ligament surface. Cascade recoil and collision-induced thermal spike effects modify material defect characteristics and crystal structure. This study elucidates the defect evolution mechanism of porous materials under proton irradiation, offering new insights for the design of other radiation-resistant porous materials as protective materials for future advanced space probes. © 2023, The Authors. All rights reserved.

关键词： Radiation damage