- Synthesis and Electrochemical Performance of Li2MnSiO4 for Lithium Ion Battery Prepared by Amorphous Silica Precusor
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Yun-Ho Jin, Kun-Jae Lee, Lee-Seung Kang, Hang-Chul Jung, Hyun-Seon Hong
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J Korean Powder Metall Inst. 2012;19(3):210-214.
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DOI: https://doi.org/10.4150/KPMI.2012.19.3.210
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- Mass production-capable Li_2MnSiO_4 powder was synthesized for use as cathode material in state-of-the-art lithium-ion batteries. These batteries are main powder sources for high tech-end digital electronic equipments and electric vehicles in the near future and they must possess high specific capacity and durable charge-discharge characteristics. Amorphous silicone was quite superior to crystalline one as starting material to fabricate silicone oxide with high reactivity between precursors of sol-gel type reaction intermediates. The amorphous silicone starting material also has beneficial effect of efficiently controlling secondary phases, most notably Li_xSiO_x. Lastly, carbon was coated on Li_2MnSiO_4 powders by using sucrose to afford some improved electrical conductivity. The carbon-coated Li_2MnSiO_4 cathode material was further characterized using SEM, XRD, and galvanostatic charge/discharge test method for morphological and electrochemical examinations. Coin cell was subject to 1.5-4.8 V at C/20, where 74 mAh/g was observed during primary discharge cycle.
- Microstructure and Mechanical Properties of Al2O3/Fe-Ni Nanocomposite Prepared by Rapid Sintering
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Young-In Lee, Kun-Jae Lee, Dae-Hwan Jang, Jae-Kyo Yang, Yong-Ho Cho
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J Korean Powder Metall Inst. 2010;17(3):203-208.
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DOI: https://doi.org/10.4150/KPMI.2010.17.3.203
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- A new High Frequency Induction Heating (HFIH) process has been developed to fabricate dense Al_2O_3 reinforced with Fe-Ni magnetic metal dispersion particles. The process is based on the reduction of metal oxide particles immediately prior to sintering. The synthesized Al_2O_3/Fe-Ni nanocomposite powders were formed directly from the selective reduction of metal oxide powders, such as NiO and Fe_2O_3. Dense Al_2O_3/Fe-Ni nanocomposite was fabricated using the HFIH method with an extremely high heating rate of 2000°C/min. Phase identification and microstructure of nanocomposite powders and sintered specimens were determined by X-ray diffraction and SEM and TEM, respectively. Vickers hardness experiment were performed to investigate the mechanical properties of the Al_2O_3/Fe-Ni nanocomposite.
- Fabrication and Characterization of Ag Nanoparticle Dispersed Polymer Nanofiber and Ag Nanofiber Using Electrospinning Method
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Hee-Taik Kim, Chi-Yong Hwang, Han-Bok Song, Kun-Jae Lee, Yeon-Jun Joo, Seong-Jei Hong, Nam-Kee Kang, Seong-Dae Park, Ki-Do Kim, Yong-Ho Cho
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J Korean Powder Metall Inst. 2008;15(2):114-118.
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DOI: https://doi.org/10.4150/KPMI.2008.15.2.114
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- Functional nanomaterial is expected to have improved capacities on various fields. Especially, metal nanoparticles dispersed in polymer matrix and metal nanofiber, one of the functional nanomaterials, are able to achieve improvement of property in the electric and other related fields. In this study, the fabrication of metal (Ag) nanoparticle dispersed nanofibers were attempted. The Ag nanoparticle dispersed polymer nanofiber and Ag nanofiber were fabricated by electrospinning method using electric force. First, PVP/AgNO_3 nanofibers were synthesized by electrospinning in 18sim22kV voltage with the starting materials (Ag-nitrate) added polymer (PVP; poly (vinylpyrrolidone)). Then Ag nanoparticle dispersed polymer nanofibers were fabricated to reduce hydrogen reduction at 150°C for 3hr. And Ag nanofibers were synthesized by the decomposited of PVP at 300sim500°C for 3hr. The nanofibers were analyzed by XRD, TGA, FE-SEM and TEM. The experimental results showed that the Ag nanofibers could be applied in many fields as an advanced material.
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Citations
Citations to this article as recorded by  - Fabrication of Nanowire by Electrospinning Process Using Nickel Oxide Particle Recovered from MLCC
Haein Shin, Jongwon Bae, Minsu Kang, Kun-Jae Lee
journal of Korean Powder Metallurgy Institute.2023; 30(6): 502. CrossRef - Fabrication of Flake-like LiCoO2Nanopowders using Electrospinning
Bon-Ryul Koo, Geon-Hyoung An, Hyo-Jin Ahn
Journal of Korean Powder Metallurgy Institute.2014; 21(2): 108. CrossRef - Synthesis of Fe-Doped TiO2/α-Fe2O3 Core-Shell Nanowires Using Co-Electrospinning and Their Magnetic Property
본율 구, 효진 안
Korean Journal of Materials Research.2014; 24(8): 423~428. CrossRef
- Synthesis of Eu3+ Doped (Y,Gd)BO3 Powder by Mechanochemical Process
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Hee-Sub Won, Wan-Jae Lee, Je-Seok Kim, Gun-Young Hong, Kun-Jae Lee, Yong-Ho Choa
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J Korean Powder Metall Inst. 2008;15(2):136-141.
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DOI: https://doi.org/10.4150/KPMI.2008.15.2.136
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- The mechanochemical process were employed to prepare the red phosphors (Y,Gd)BO_3:Eu3+. The main factors affecting particle size, particle distribution, and luminescent properties of the product were investigated in details. Particles sized around 200-600 nm are formed after intensive milling. The phosphors were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and photoluminescence spectrum. Results revealed that phosphors with different morphology, small particle size and high luminescence intensity could be obtained by mechanochemical process.
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Citations
Citations to this article as recorded by - Photoluminescence Properties of Green Phosphor Y1-xBO3:Tbx3+Synthesized by Solid-state Reaction Method
Shin-Ho Cho
Journal of the Korean Institute of Electrical and Electronic Material Engineers.2011; 24(8): 659. CrossRef
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