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Preparation of LFP-based cathode materials for lithium-ion battery applications

materials Today: Proceedings 2022年 65卷 2347-2350页

作者： Suttison, Suchanat Pengpat, Kamonpan Intatha, Uraiwan Fan, Jinchen Zhang, Wei Eitssayeam, Sukum Master's Degree Program in Materials Science Faculty of Science Chiang Mai University Chiang Mai 50200 Thailand Graduate School Chiang Mai University Chiang Mai Thailand Department of Physics and Materials Science Faculty of Science Chiang Mai University Thailand Center of Innovative Materials for Sustainability School of Science Mae Fah Luang University Chiang Rai 57100 Thailand School of Materials and Chemistry University of Shanghai for Science and Technology Shanghai 200093 China Department of Engineering Mechanics Dalian University of Technology Dalian 116024 China

Lithium-ion batteries (LIB) have developed into the mainstream power source of energy storage devices due to their advantages: high power density, high power, long service life, and less pollution. This materials development for LFP batteries was considered successful in synthesizing powder. Here we show that three synthesis conditions were performed. LFP doped NiO, NMC, and (NH4)2HPO4 were synthesized by the nitrogen gas flow method. LFP-doped NiO was burned at 600 °C and 700 °C for five h. NMC doped with LFP burned at 550 °C for five h, and NMC-doped LFP and (NH4)2HPO4 were burned at 550 °C and 600 °C for five h. The structure and morphology of the material were examined by X-ray diffraction (XRD) and scanning electron microscopy (SEM). © 2022

关键词： Lithium-ion batteries

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Zinc oxide addition in cement pastes to study the viability of reciclyng electric arc furnace (EAF) dust in civil construction

Zinc oxide addition in cement pastes to study the viability ...

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2nd International Meeting on Ironmaking and 1st International Symposium on Iron Ore and Parallel Event- 5th Japan-Brazil Symposium on Dust Processing-Energy-Environment on Metallurgical Industries

作者： Brehm, Feliciane Dal Molin, Denise Vilela, Antônio Cezar Faria Moraes, Carlos Alberto Mendes Post-Graduate Program in Metallurgical Mines and Materials Engineering/PPGEM Federal University of Rio Grando do Sul UFRGS DECIV UFRGS DEMET PPGEM UFRGS University of Vale do Rio Dos Sinos UNISINOS

ISBN: (纸本)8586778753

EAF dust recycling has become necessary, specially, due to Environment Agencies Regulations to final disposition of such waste. One of the alternatives for it's recycling is the addition in concrete pavement. However, this addition retards this beginning of the hydration reactions of the cement, which retardation does not permit its use. This retardation is attributed to the contained zinc in the EAF dust. This element is present in the EAF dust as two compounds, franklinite (FeZn2O4) and zincite (ZnO). This work has the aim to study the phenomena related to the retardation of the beginning of hydration reactions, caused by the addition of ZnO into cement paste. 10 wt% of ZnO were added to cement pastes. The samples with and without ZnO were analyzed via Scanning Electron microscopy (SEM) e X-Ray Diffraction in different ages to evaluate the phenomena occurred during the hydration of the cement pastes.

关键词： Zinc oxide

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DAMAGE TOLERANCE OF DOUBLE-DOUBLE LAMINATES 23

DAMAGE TOLERANCE OF DOUBLE-DOUBLE LAMINATES

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23rd International Conference on Composite materials, ICCM 2023

作者： Melo, Jose Daniel D. Cunha, Rayane D. Targino, Talita G. Freire Junior, Raimundo C.S. Ferreira, Evans P.C. Medeiros, Antonio M. Department of Materials Engineering Federal University of Rio Grande do Norte Natal Brazil Graduate Program in Materials Science and Engineering Federal University of Rio Grande do Norte Natal Brazil SENAI Innovation Institute Natal Brazil

Double-double (DD) lay-up is a new configuration strategy for the design of composite laminates, which allows the use of simplified stacking sequences that leads to potential advantages, such as improved manufacturability and design optimization, as compared to traditional quadriaxial laminates (Quad), which are limited to ply angles of 0°, ±45° and 90°. With the double-double concept, through-the-thickness homogenization is facilitated using thinner sub-laminates and, consequently, profile optimization through thickness tapering becomes possible. In this work, damages after impact and after CAI tests of a double-double laminate (+50/0/-50/0)10 and a hard conventional laminate of equivalent in-plane stiffness (03/90/±45/02/±45)2S are compared. According to the data presented, maximum delaminated areas were of the same order of magnitude for the quad and for the DD laminates, under both conditions: after impact and after CAI tests. The results contribute to the understanding of potential benefits of the double-double concept to damage resistance and damage tolerance of composite laminates. © 2023 International Committee on Composite materials. All rights reserved.

关键词： Damage tolerance

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Study on sintering and hardness of 316L stainless steel reinforced with tantalum carbide

Study on sintering and hardness of 316L stainless steel rein...

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European Powder Metallurgy Congress and Exhibition, Euro PM 2007

作者： Gomes, U.U. Soares, S.R.S. Furukava, M. Oliveira, L.A. Souza, C.P. Federal University of Rio Grande do Norte - UFRN Materials Science and Engineering Pos-Graduate Program Campus Universitário 59072-970 Natal RN Brazil

ISBN: (纸本)9781899072293

The present study investigates the behavior of the sintering and micro-hardness of stainless steel samples reinforced with nanoparticles of tantalum carbide (TaC). The main aim was to identify the effect of the dispersion of carbides over the microstructure and the mechanical properties of the compacts. Samples of AISI 316L pure and with the addition of 3% wt TaC were cold compacted in a cylindrical steel die (Ø = 5.0 mm) at 700 MPa and sintered in a vacuum furnace. The heating rate and sintering temperature used were 20°C/min and 1290°C respectively during 60 minutes. The results show that the carbides distribution increases the sintering kinetics and micro-hardness of the samples. We have been able to produce sintered samples with a relative density between 91.0% and 93.0%. The highest micro-hardness values using a 10N load were 115 HV for the reinforced sample and 76 HV for the sample without reinforcement.

关键词： Sintering

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Exploring the Correlation Between Surface Roughness, Surface Energy, Nano-indentation, Electrical Properties, and Magnetic Characteristics of Annealed Co40Fe40Dy20 Thin Films Deposited on Si(100) Substrates

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Journal of Electronic materials 2024年第8期53卷 4498-4511页

作者： Liu, Wen-Jen Chang, Yung-Huang Hsu, Shuo-Ting Fern, Chi-Lon Chen, Yuan-Tsung Tsao, Shin-Ying Lin, Shih-Hung Department of Materials Science and Engineering I-Shou University Kaohsiung840 Taiwan Bachelor Program in Industrial Technology National Yunlin University of Science and Technology 123 University Road Section 3 Yunlin Douliou64002 Taiwan Graduate School of Materials Science National Yunlin University of Science and Technology 123 University Road Section 3 Yunlin Douliou64002 Taiwan Department of Electronic Engineering National Yunlin University of Science and Technology 123 University Road Section 3 Yunlin Douliou64002 Taiwan

The impact of film thickness and annealing temperature on the structural, electrical, magnetic, and mechanical properties of cobalt–iron–dysprosium (Co40Fe40Dy20 ) thin films deposited on Si(100) substrates have been investigated. X-ray diffraction (XRD) analysis confirmed the film's crystalline microstructure, featuring dysprosium oxide, Dy2O3(440), and cobalt oxide, Co2O3(422) and Co2O3(511), crystallographic phases. Surface energy measurements indicated a noticeable reduction in surface energy following annealing treatments, which could be ascribed to the alleviation of residual stress and enhanced atomic arrangement, resulting in a more stable film structure with reduced surface energy. The film exhibited a decreasing trend in hardness with increasing thickness, and film resistivity was significantly responsive to alterations in thickness and annealing temperature. Notably, the Co40Fe40Dy20 film demonstrated exceptional characteristics, featuring a high saturation magnetization (Ms) of 675 emu/cm3 and a low coercivity (Hc) of 9.5 Oe. Further analysis of magnetic domains and hysteresis loops revealed that larger and brighter domains were associated with higher Hc. To sum up, the surface roughness of CoFeDy films under various annealing temperatures played a pivotal role in shaping their magnetic, electrical, adhesive, and optical characteristics. An improved low-frequency alternating current magnetic susceptibility (χac) value was achieved by minimizing the pinning effect on domain walls through surface smoothing. Moreover, smoother surfaces displayed heightened carrier conductivity, resulting in a decrease in electrical resistance. On the whole, Co40Fe40Dy20 films exhibited outstanding soft magnetic properties, encompassing high saturation magnetization, low coercivity, exceptional mechanical attributes, and decreased surface energy. Graphical Abstract: (Figure presented.) © The Minerals, Metals & materials Society 2024.

关键词： Magnetic susceptibility

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Microwave sinterability of pure and CuO doped ZnO macroporous ceramic foams with deposited zinc oxide nanoparticles produced by bioinspired replica technique 18

Microwave sinterability of pure and CuO doped ZnO macroporou...

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18th International Conference on Microwave and High Frequency Applications, AMPERE 2021

作者： Cardoso, A.L.F. Maestrelli, S.C. Perdomo, C.P.F. Kiminami, R.H.G.A. Gunnewiek, R.F.K. Federal University of São Carlos Post Graduate Program in Materials Science and Engineering rod. Washington Luiz km 235 SP São Carlos13565-905 Brazil km 533 MG Poços de Caldas 37715-400 Brazil

Macroporous open-celled ceramic foams finds applications in numerous technological fields, like particle filters, insulating coatings, porous support for catalyst and photocatalyst processes, and even photoelectrochemical applications. In latter two, a macroporous open cell structure favors photoelectrochemical and photocatalyst reactions, due to its higher surface area. Many methods are used for producing these types of ceramics, specially the replica technique. In this simple method, the samples are obtained by impregnating a highly porous polymeric foam with a high solid loading ceramic slurry. After thermal treatment, the macroporous ceramic presents the structure of the polymeric foam used as template. Exceptionally complex and regular geometries can also be found in nature, which is the case of the Luffa sp sponge, that can replace the use of synthetic polymeric foams. In this work, microwave sinterability of porous ceramics obtained by impregnation of high solid loading ceramic slurries of nanostructured zinc oxide in natural Luffa sp fibrous sponges. Carboxymethyl cellulose (CMC), xanthan gum (XG) and polyvinyl alcohol (PVA) were assessed as binder agents. Ceramic slurries were prepared by dispersing nanostructured zinc oxide in distilled water (70% wt. ratio) using ammonium polyacrilate (APA) as deflocculant, followed by mixing in a high shear mixer (IKA Ultra-Turrax T25) for 10 minutes. After homogenization, binders were added and mixed in mechanical mixer for 10 minutes. The sponges (with dimensions of 2x2x1 cm) were carefully immersed in the ceramic slurry, squeezed to remove excess and then left to dry 24h in air. The dried ceramic foams were microwave heated at 550 °C during 10 minutes with 100 °C/min heating rate, followed by microwave sintering at 1150 and 1200 °C during 15 minutes with a 100 °C/min heating rate. The microwave sintered samples were analyzed by optical and scanning electron microscopy, photocatalysis efficiency and density measurement

关键词： Microwave heating

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Multi-agent Architecture for Passive Rootkit Detection with Data Enrichment

Multi-agent Architecture for Passive Rootkit Detection with...

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International Conference on Computer science, Electronics, and Industrial engineering, CSEI 2022

作者： Trinks, Maickel Gondim, João Albuquerque, Robson Professional Post-Graduate Program in Electrical Engineering - PPEE - Department of Electrical Engineering University of Brasília DF Brasília Brazil Department of Computer Science Universidade de Brasília DF Brasília Brazil

ISBN: (纸本)9783031305917

The added value of the information transmitted in a cybernetic environment has resulted in a sophisticated malicious actions scenario aimed at data exfiltration. In situations with advanced actors, like APTs, such actions use obfuscation techniques of harmful activities as persistence assurance on strategic targets. The MADEX and NERD architectures proposed flow analysis solutions to detect rootkits that hide network traffic;however, it presents some operational cost, either in traffic volume or due to lack of aggregated information. In that regard, this work changes and improves user flow analysis techniques to eliminate impacts on network traffic, with data enrichment on local and remote bases, detection of domains consulted by rootkits and aggregation of information to generate threat intelligence, while maintaining high performance. The results show the possibility of aggregating information to data flows used by rootkits in order to have effective cyber defense actions against cybernetic threats without major impacts on the existing network infrastructure. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Multi agent systems

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A study of the structural, electronic, optical, and thermoelectric properties of the stable double perovskite Ba2KIO6 using density functional theory

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Optical and Quantum Electronics 2024年第7期56卷 1-15页

作者： Shafiullah, Muhammad Ullah, Sana Ali, Malak Azmat Albaqami, Munirah D. Mohammad, Saikh Faizan, Muhammad Department of Physics National Chung Hsing University Taichung40227 Taiwan Department of Physics Government Post Graduate Jahanzeb College Saidu Sharif Swat Khyber Paktunkhwa19130 Pakistan Department of Chemistry College of Science King Saud University Riyadh11451 Saudi Arabia College of Materials Science and Engineering Jilin University Changchun130012 China

Double oxide perovskites have recently attracted immense research interest owing to their excellent structural diversities and tunable functional properties, making them promising candidates for renewable energy applications such as photovoltaics, photocatalysis, and thermoelectric devices. In this study, we systematically computed the structural stability, electronic, optical, and thermoelectric properties of a novel perovskite oxide, Ba2KIO6, using first principles calculations within the PBE-GGA and TB-MBJ exchange-correlation functionals. Our results predicted that Ba2KIO6 crystallizes in a stable cubic double perovskite structure. The electronic structure calculations revealed the indirect band gaps of Ba2KIO6 as 0.81 eV with PBE-GGA and 2.1 eV with TB-MBJ. The calculated optical properties, including the dielectric function and optical conductivity, showed strong light absorption in the UV region, highlighting its potential for optoelectronic applications. Furthermore, our calculations of the thermoelectric performance metrics, including the Seebeck coefficient, electrical conductivity, and thermal conductivity, revealed Ba2KIO6 to possess a decent figure-of-merit, highlighting its potential for efficient thermoelectric applications. Overall, our first-principles study provides useful insights into the diverse functional properties of the novel Ba2KIO6 perovskite oxide and suggests its applicability in thermoelectric generators and optoelectronic devices. © The Author(s), under exclusive licence to Springer science+Business Media, LLC, part of Springer Nature 2024.

关键词： Barium compounds

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Impact of selective ablation of self-assembly monolayer by localized Joule heating on silicon nanoelectronic sensors

Impact of selective ablation of self-assembly monolayer by l...

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IEEE SENSORS

作者： H. H. Liu T. H. Lin J. -T. Sheu Department of Materials Science and Engineering Graduate Program for Nanotechnology Taiwan

ISBN: (纸本)9781457717666

Silicon nanodevice biosensors have been attracted a lot of attention due to its advantages of label-free, real-time and very high sensitive detection. This study employs self-assembly monolayer (SAM) of methoxy-poly(ethyleneglycol) silane (MPEG-sil) as passivation on Si nanodevices. Ablation of SAM by Joule heating (JH) was performed at n - region of a nanobelt device, where the linker molecules, biotin were modified subsequently. Detection of Alexa dye-labeled Streptavidin (SA) showed that the fluorescence intensity at n - region increased with each 50-μl SA injection and saturated after the 4 th injection. A difference of fluorescence intensity between SAM-ablated device and without passivation is 4.9 fold. Threshold voltage (V th ) shifted ca. 35 mV after the 4 th injection for SAM-ablated device and as-fabricated device exhibited only a 10-mV V th shift. The results indicated that SAM-ablated device possess potential in reduction of sensing time and in increase of sensitivity for low concentration detection.

关键词： Nanoscale devices Fluorescence Nanobioscience Silicon Heating Surface treatment Biosensors

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Surface morphology engineering of Cu for nanoscale strain control in graphene

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Surfaces and Interfaces 2025年 67卷

作者： Dong Jin Kim Cheolho Jeon Bo Hyeon Kim Jooyoung Yoon Seungryul Yoo Hwanuk Guim Yun Sung Woo Byung Hee Hong Joonhee Moon Program in Nano Science and Technology Graduate School of Convergence Science and Technology Seoul National University AbsSeoul 08826 Republic of Korea Graphene Square Inc. Suwon 16229 Republic of Korea Research Center for Materials Analysis Korea Basic Science Institute Daejeon 34133 Republic of Korea Department of Materials Science and Engineering Dankook University Chungnam 3116 Republic of Korea Institute of Plasma Technology Korea Institute of Fusion Energy (KFE) Gunsan Jeollabuk-do 54004 South Korea Department of Chemistry Seoul National University Seoul 08826 Republic of Korea

The most promising method for synthesizing high-quality, large-scale graphene films involves chemical vapor deposition (CVD) of carbon-containing precursors onto Cu substrates. During graphene growth in a CVD system, the interaction between graphene and the Cu substrate leads to the formation of anisotropic Cu step bunches, driven by interfacial surface energy minimization and the release of compressive stress during thermal cooling. It is widely acknowledged that a smooth substrate is crucial for achieving high-quality graphene, as graphene strain and Cu surface roughening induce wrinkles when transferred onto a silicon wafer, which negatively impacts the quality. Here, we introduce a straightforward approach for controlling strain in graphene by engineering the Cu surface morphology through mechanical tension during the growth process. We achieve a uniform distribution of low compressive strain across the graphene layer by applying varying mechanical weights to the Cu foil. Using atomic force microscopy (AFM), scanning electron microscopy (SEM), and Raman spectroscopy, we demonstrate that mechanical tension significantly reduces Cu surface roughness, providing a smoother interface for graphene growth. This work provides insights into the relationship between Cu surface structure and graphene strain, contributing to the optimization of substrate preparation for graphene synthesis and other related surface engineering applications.

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