Journal of the Japan Society of Powder and Powder Metallurgy
Online ISSN : 1880-9014
Print ISSN : 0532-8799
ISSN-L : 0532-8799
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Volume 60, Issue 1
January
Displaying 1-10 of 10 articles from this issue
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Special Issue: New Developments of Battery Materials for the Next Generation
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Paper
  • Synthesis and Ti Substitution Effect of Fe-Substituted Li2MnO3 Positive Electrode Material
    Mitsuharu TABUCHI, Yoko NABESHIMA, Tomonari TAKEUCHI, Hiroyuki KAGEY ...
    2013 Volume 60 Issue 1 Pages 3-8
    Published: January 15, 2013
    Released on J-STAGE: March 01, 2013
    DOIhttps://doi.org/10.2497/jjspm.60.3
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    Fe- or Fe and Ti-substituted Li2MnO3 positive electrode material (FM or FMT sample) with monoclinic Li2MnO3 type structure (C2/m) was synthesized using coprecipitation-hydrothermal-calcination. Both materials exhibited high specific capacity greater than 200 mAh/g against a Li metal negative electrode at moderate current density of 40 mA/g between 2.0 and 4.8 V using stepwise charging. The cycle performance for the FMT sample (Li1+x(Fe0.2Ti0.2Mn0.6)1−xO2, 0 < x< 1/3) using a graphite negative electrode was better than that for the FM sample (Li1+x(Fe0.2Mn0.8)1−xO2, 0<x<1/3), indicating that partial substitution of Ti4+ for Mn4+ ion is effective for improving cycle performance under the practical lithium-ion cell configuration. The results presented above demonstrate that an Fe-substituted Li2MnO3 based positive electrode material can become an attractive candidate as an inexpensive constituent material for a large-scale lithium-ion battery by selecting suitable additional elements such as Ti and electrochemical charge conditions for activation.
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  • Synthesis and Rechargeable Properties of Na2/3Fe1/3Mn2/3O2 Cathode Active Materials
    Takashi OGIHARA, Takayuki KODERA
    2013 Volume 60 Issue 1 Pages 9-12
    Published: January 15, 2013
    Released on J-STAGE: March 01, 2013
    DOIhttps://doi.org/10.2497/jjspm.60.9
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    Na2/3Fe1/3Mn2/3O2 cathode active materials were prepared by spray pyrolysis. As-prepared powders had spherical morphology with dense microstructure which had an average diameter of about 1 µm with broad size distribution.The particle morphology of Na2/3Fe1/3Mn2/3O2 cathode active materials were influenced by the calcination and the polygonal morphology was obtained at 900 °C. XRD showed that as-prepared powders was well crystallized to P2 type structure after the calcination at 800 °C. The electrochemical measurement of Na2/3Fe1/3Mn2/3O2 cathode showed that the two plateaus were observed at 3 V and 4.3 V in rechargeable curve and the discharge capacity of Na2/3Fe1/3Mn2/3O2 cathode was 203 mAh/g at 0.01C. After 100th cycle, the discharge capacity and capacity retention of Na2/3Fe1/3Mn2/3O2 cathode was 116 mAh/g and 70 % at 0.1C, respectively.
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  • Preparation of Li2S-FeS2 Composite Electrode Materials and their Electrochemical Properties
    Tomonari TAKEUCHI, Hiroyuki KAGEYAMA, Koji NAKANISHI, Toshiaki OHTA, A ...
    2013 Volume 60 Issue 1 Pages 13-18
    Published: January 15, 2013
    Released on J-STAGE: March 01, 2013
    DOIhttps://doi.org/10.2497/jjspm.60.13
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    Li2S-FeS2 composite positive electrode materials were prepared for improving the discharge capacity of the all-solid-state In/Li2S cells via the electrical conductivity enhancement of Li2S. The electrochemical tests demonstrated that the In/Li2S-FeS2 (Li2S : FeS2 = 3 : 7 wt) cells showed relatively higher discharge capacity (ca. 180 mAh • g−1, normalized by the cathode weight) than that of the In/Li2S-C cells (ca. 140 mAh • g−1), due to the increased fraction of the active materials in the cathodes. The ex-situ XRD and S K-edge XAFS results indicated that the In/Li2S- FeS2 cells showed similar electrochemical reaction to that of the Li/Li2S-FeS2 cells with liquid electrolytes during charge, but did not proceed to form Li2S and Fe during discharge. Such difference was due to the limited amounts of Li ions supplied from the lithiated-In anode during discharge for the In/Li2S-FeS2 cells.
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  • Synthesis and Electrochemical Properties of Ramsdellite Type Lithium Titanate Anode Materials by Spray Pyrolysis
    Takashi OGIHARA, Takuya OOMURA, Takayuki KODERA
    2013 Volume 60 Issue 1 Pages 19-23
    Published: January 15, 2013
    Released on J-STAGE: March 01, 2013
    DOIhttps://doi.org/10.2497/jjspm.60.19
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    Ramsdellite type lithium titanate (Li2Ti3O7) powders were prepared by spray pyrolysis. Chemical and physical properties of Li2Ti3O7 powders were characterized by SEM, DTG, XRD and ICP. As-prepared Li2Ti3O7 precursor powders had a spherical morphology with hollow microstructure, but the irregular shaped morphology was obtained after the calcination above 900 °C. The crystal phase of ramsdellite Li2Ti3O7 was obtained by the calcination at 1100 °C. The first rechargeable capacities of Li2Ti3O7 anode were 168 mAh/g and 82 mAh/g at 0.1 mA/cm2 and 20 mA/cm2, respectively. The retention ratio of discharge capacity was 99 % at 1 mA/cm2 after 100th cycle. The cycle performance of Li2Ti3O7 anode had also high stability at 50 °C.
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  • Multiple Electron Reaction of Li2RuO3 Electrode for Lithium Batteries
    Sou TAMINATO, Masaaki HIRAYAMA, Kunimitsu YAMAMOTO, Yueming ZHENG , R ...
    2013 Volume 60 Issue 1 Pages 24-28
    Published: January 15, 2013
    Released on J-STAGE: March 01, 2013
    DOIhttps://doi.org/10.2497/jjspm.60.24
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    Lithium excess layered rocksalt material Li2RuO3 was synthesized by a solid-state reaction, and intercalation properties were characterized by electrochemical and structural investigations. The first discharge capacities of the Li2RuO3 electrode operated in charge/discharge ranges of 3.0−4.5 V, 1.0−4.5 V and 0.5−4.5 V were 165 mAh g−1, 450 mAh g−1, and 845 mAh g−1, respectively. X-ray absorption near edge structure spectra indicated that the valence states of Ru ions reversibly changed between 5+ and 0 at the range of 1.0−4.5 V. The Li2RuO3 electrode reversibly delivered a five-electron reaction in the charge/discharge ranges of 1.0−4.5 V.
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