Journal of Powder Materials

Lee-Seung Kang

4 Articles

Optimization of Wet Reduction Processing for Nanosized Cobalt Powder: Hyun-Seon Hong, Hang-Chul Jung, Geon-Hong Kim, Lee-Seung Kang, Han-Gil Suk; J Powder Mater. 2013;20(3):191-196.; DOI: https://doi.org/10.4150/KPMI.2013.20.3.191

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Nano-sized cobalt powder was fabricated by wet chemical reduction method at room temperature. The effects of various experimental variables on the overall properties of fabricated nano-sized cobalt powders have been investigated in detail, and amount of NaOH and reducing agent and dropping speed of reducing agent have been properly selected as experimental variables in the present research. Minitab program which could find optimized conditions was adopted as a statistic analysis. 3D Scatter-Plot and DOE (Design of Experiments) conditions for synthesis of nano-sized cobalt powder were well developed using Box-Behnken DOE method. Based on the results of the DOE process, reproducibility test were performed for nano-sized cobalt powder. Spherical nano-sized cobalt powders with an average size of 70-100 nm were successfully developed and crystalline peaks for the HCP and FCC structure were observed without second phase such as Co(OH)_2.

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Preparation of Spherical Cobalt Fine Powders by New Liquid Reduction Method
Dae Weon Kim, Ji-Hoon Kim, Yo-Han Choi, Hee Lack Choi, Jin-Ho Yoon
journal of Korean Powder Metallurgy Institute.1970; 22(4): 260. CrossRef

Synthesis and Electrochemical Performance of Li₂MnSiO₄ for Lithium Ion Battery Prepared by Amorphous Silica Precusor: Yun-Ho Jin, Kun-Jae Lee, Lee-Seung Kang, Hang-Chul Jung, Hyun-Seon Hong; J Korean Powder Metall Inst. 2012;19(3):210-214.; DOI: https://doi.org/10.4150/KPMI.2012.19.3.210

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Abstract PDF: 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.

Preparation of the Nano Cobalt Powder by Wet Chemical Reduction Method: Hyun-Seon Hong, Young-Dae Ko, Lee-Seung Kang, Geon-Hong Kim, Hang-Chul Jung; J Korean Powder Metall Inst. 2011;18(3):244-249.; DOI: https://doi.org/10.4150/KPMI.2011.18.3.244

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Spherical nanosized cobalt powder with an average size of 150-400 nm was successfully prepared at room temperature from cobalt sulfate heptahydrate (CoSO_4cdot7H_2O). Wet chemical reduction method was adopted to synthesize nano cobalt powder and hypophosphorous acid (H_3PO_2) was used as reduction agent. Both the HCP and the FCC Co phase were developed while CoSO_4cdot7H_2O concentration ranged from 0.7 M to 1.1 M. Secondary phase such as Co(OH)_2 and CO_3O_4 were also observed. Peaks for the crystalline Co phase having HCP and FCC structure crystallized as increasing the concentration of H_3PO_2, indicating that the amount of reduction agent was enough to reduce Co(OH)_2. Consequently, a homogeneous Co phase could be developed without second phase when the H_3PO_2/CoSO_4cdot7H_2O ratio exceeded 7.

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First-principles calculations to investigate electrochemical performance, storage mechanism and magnetocaloric effect of LiFeBO3 for lithium-ion batteries and magnetic refrigerants
Othmane Mennaoui, Rachid Masrour, Ling Xu, El Kebir Hlil
Ionics.2024;[Epub] CrossRef
Spark plasma sintering of WC–Co tool materials prepared with emphasis on WC core–Co shell structure development
Sungkyu Lee, Hyun Seon Hong, Hyo-Seob Kim, Soon-Jik Hong, Jin-Ho Yoon
International Journal of Refractory Metals and Hard Materials.2015; 53: 41. CrossRef
Coating of Cobalt Over Tungsten Carbide Powder by Wet Chemical Reduction Method
Hyun-Seon Hong, Jin-Ho Yoon
Journal of Korean Powder Metallurgy Institute.2014; 21(2): 93. CrossRef
Optimization of Wet Reduction Processing for Nanosized Cobalt Powder
Hyun-Seon Hong, Hang-Chul Jung, Geon-Hong Kim, Lee-Seung Kang, Han-Gil Suk
Journal of Korean Powder Metallurgy Institute.2013; 20(3): 191. CrossRef
Synthesis and Characterization of CoFe2O4/SiO2using Cobalt Precursors from Recycling Waste Cemented Carbide
Ri Yu, Jae-Hwan Pee, Yoo-Jin Kim
Journal of the Korean Ceramic Society.2011; 48(5): 454. CrossRef
Preparation of Spherical Cobalt Fine Powders by New Liquid Reduction Method
Dae Weon Kim, Ji-Hoon Kim, Yo-Han Choi, Hee Lack Choi, Jin-Ho Yoon
journal of Korean Powder Metallurgy Institute.1970; 22(4): 260. CrossRef

Research and Development Status of Low-Cost Fe-based Cathode Materials for Lithium Secondary Batteries: Hyun-Seon Hong, Young-Dae Ko, Lee-Seung Kang, Hang-Chul Jung, Geon-Hong Kim; J Korean Powder Metall Inst. 2011;18(2):196-203.; DOI: https://doi.org/10.4150/KPMI.2011.18.2.196

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Study of storage mechanism and the electrochemical performance of LiMnBO 3 for lithium‐ion batteries
Othmane Mennaoui, Rachid Masrour, Abderrahim Jabar, El Kebir Hlil
International Journal of Energy Research.2022; 46(14): 19875. CrossRef
Solvent Extraction of Co, Ni and Mn from NCM Sulfate Leaching Solution of Li(NCM)O2 Secondary Battery Scraps
Hyun Seon Hong, Dae Weon Kim, Hee Lack Choi, Sung-Soo Ryu
Archives of Metallurgy and Materials.2017; 62(2): 1011. CrossRef
Synthesis and characterization of LiMnBO3 cathode material for lithium ion batteries
Kun-Jae Lee, Lee-Seung Kang, Sunghyun Uhm, Jae Sik Yoon, Dong-Wan Kim, Hyun Seon Hong
Current Applied Physics.2013; 13(7): 1440. CrossRef

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