Journal of the Society of Powder Technology, Japan
Online ISSN : 1883-7239
Print ISSN : 0386-6157
ISSN-L : 0386-6157
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Volume 52, Issue 11
Displaying 1-5 of 5 articles from this issue
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Original Paper
  • Effect of Heating Temperature on the Battery Performances of LiCoO2 Granules Synthesized by Mechanical Method
    Eri Nakamura, Akira Kondo, Mitsuaki Matsuoka, Takahiro Kozawa, Maki ...
    2015 Volume 52 Issue 11 Pages 634-640
    Published: November 10, 2015
    Released on J-STAGE: November 18, 2015
    DOIhttps://doi.org/10.4164/sptj.52.634
    JOURNAL FREE ACCESS
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    Mechanical method using an attrition-type mill is a useful method to synthesize LiCoO2 granules consisting of primary nanoparticles without external heating. On the other hand, the heat treatment after synthesis of LiCoO2 granules is needed to improve its electrochemical performances. Here we report the effect of heating temperature on the battery performances of the LiCoO2 granule cathode. By heating the LiCoO2 granules synthesized by mechanical method, the size of primary particles increased with increasing heating temperature from 600℃ to 800℃, whereas the granule structure was maintained. The cathode of LiCoO2 granules heated at 800℃ exhibited the highest discharge capacity at 0.1 C rate. However, in the case of the charge-discharge tests at high rate, the cathode of LiCoO2 granules heated at 700℃ showed a high discharge capacity over 70 mA・h/g. The relationship between the microstructure of LiCoO2 granule and the battery performance was discussed.
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Technical Note
  • A Simple Evaluation Method for Kneading State Using Common Testing Materials
    Munetake Satoh
    2015 Volume 52 Issue 11 Pages 641-647
    Published: November 10, 2015
    Released on J-STAGE: November 18, 2015
    DOIhttps://doi.org/10.4164/sptj.52.641
    JOURNAL RESTRICTED ACCESS
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    An expedient experimental method has been proposed to evaluate the kneading state and process based on measuring of the flow and dispersion characteristics for the kneaded mass. The talc powder containing 20 mass％ of vaseline binder was adopted as a common testing material. The comprehensive change in the flow characteristics of kneaded mass with operating time was measured by a simple extruding test using a capillary rheometer. Furthermore, proper amount of blue pigment powder was added to trace the dispersing process and its attainable state.
    Kneading characteristic curves were obtained based on both apparent viscosity and relative lightness value of the kneaded mass samples. It has been shown that the simple direct extrusion test and the tracer technique including the combination of the testing materials were recommendable convenient methods as the first step to evaluate the complicated kneading phenomena and processes. As a case study, characterization of the different types of kneader has been demonstrated by using the index KIDX.
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Review
  • Sinterable Powder Fabrication and the Oxygen-ion Conductivity of Lanthanum Silicate Oxyapatite
    Kiyoshi Kobayashi, Yoshio Sakka
    2015 Volume 52 Issue 11 Pages 648-657
    Published: November 10, 2015
    Released on J-STAGE: November 18, 2015
    DOIhttps://doi.org/10.4164/sptj.52.648
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    Fabrication processes for sinterable powder of lanthanum silicate oxyapatite are reviewed. Although the sinterable powder of the lanthanum silicate oxyapatite has been mainly prepared by sol-gel method before 2014, more simple process by combinations of solid state reaction and planetary- ball mill has been developed. Based on the powder morphology and agglomeration control, sintering temperature for dense ceramics fabrication gradually decrease until about 1673 K. On the other hand, reported data on the oxygen-ion conductivity show large scattering by each paper.
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Review: Frontier Research Series
  • Prediction of NOx Formation in Pulverized Coal Combustion Fields Using Large-eddy Simulation
    － Application to Multi-scale Combustion Fields －
    Masaya Muto
    2015 Volume 52 Issue 11 Pages 658-662
    Published: November 10, 2015
    Released on J-STAGE: November 18, 2015
    DOIhttps://doi.org/10.4164/sptj.52.658
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    Large-eddy simulation （LES） is applied to predict characteristics of NOx formation in two different pulverized coal combustion fields. A laboratory-scale open-type pulverized coal flame generated by a triple stream co-axial swirl burner and a large-scale combustion test furnace with practical complex burners are targeted. The results of the computation on the laboratory-scale burner show that NO formed due to the oxidation reaction of nitrogen from volatile matter of coal rapidly decreases just downstream of the region where the peak value appears due to the reduction reaction. The trend becomes marked with increasing O2 concentration. The results of the large-scale furnace show that the gas temperature and O2 and NO concentrations are qualitatively captured by the present LES. This suggests the usefulness of the LES for predicting the characteristics of NOx formation in coal flames.
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Fundamentals of Powder Technology, 2nd Edition
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