- Preparation of the Nano Cobalt Powder by Wet Chemical Reduction Method
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Hyun-Seon Hong, Young-Dae Ko, Lee-Seung Kang, Geon-Hong Kim, Hang-Chul Jung
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J Korean Powder Metall Inst. 2011;18(3):244-249.
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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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- Research and Development Status of Low-Cost Fe-based Cathode Materials for Lithium Secondary Batteries
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Hyun-Seon Hong, Young-Dae Ko, Lee-Seung Kang, Hang-Chul Jung, Geon-Hong Kim
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J Korean Powder Metall Inst. 2011;18(2):196-203.
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DOI: https://doi.org/10.4150/KPMI.2011.18.2.196
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