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Key engineering materials
Trans Tech Publications Ltd.
Key engineering materials

Trans Tech Publications Ltd.

半月刊

1013-9826

Key engineering materials/Journal Key engineering materials
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    Preparation and Characterization of La_(0.8)Sr_(0.2)Ga_(0.8)Mg_(0.2)O_(3-δ) Film by Electrophoretic Deposition Method

    Araki ToriyamaKenichi MyoujinTakayuki KoderaTakashi Ogihara...
    P.86-90页
    查看更多>>摘要：La_(0.8)Sr_(0.2)Ga_(0.8)Mg_(0.2)O_(3-δ) (LSGM) precursor particles were successfully prepared by ultrasonic spray pyrolysis. LSGM thin films were prepared by the electrophoretic deposition (EPD) technique using ethanol containing iodine. The LSGM films were obtained by sintering at 1300 ℃ for 10 h. The X-ray diffraction patterns revealed that the diffraction peak of LSGM thin films was in agreement with the perovskite structure. The LSGM films attained a uniform thickness of 10 μm.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Synthesis and Electrochemical Properties of Porous LiAl_(0.05)Mn_(1.95)O_4 for High Power LIB by Spray Pyrolysis

    Takayuki KoderaSyoji HiroseTakashi Ogihara
    P.91-94页
    查看更多>>摘要：Spherical LiAl_(0.05)Mn_(1.95)O_4 precursor powders were successfully prepared by spray pyrolysis. LiAl_(0.05)Mn_(1.95)O_4 precursor powders were calcined by 800℃ for 10hrs. The particles size, morphology, microstructure, crystal phases of the calcined powders were characterized by X-ray diffraction (XRD) and a scanning electron microscope (SEM). The XRD patterns showed that the crystal phases of the calcined powders were the same as spinel phase (space group: Fd3m). The particles exhibited a spherical morphology with a porous microstructure. The particle size of the primary particles was approximately 200nm. LiAl_(0.05)Mn_(1.95)O_4 cathodes exhibited higher rechargeable capacity and cycle stability at high rates. The particle microstructure of LiAl_(0.05)Mn_(1.95)O_4 powders was effective for the rechargeable capacity at high rates.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Preparation and Electrochemical Properties of C/LiMnPO_4 for Lithium-Ion Battery by Spray Pyrolysis

    Yuichi SuetsuguAtsushi HujitaTakayuki KoderaTakashi Ogihara...
    P.95-99页
    查看更多>>摘要：Spherical C/LiMn_(1-X)M_XPO_4 (M=Mg, Zn) cathode materials were successfully prepared by spray pyrolysis. An olivine structure was obtained by heating at 973 K under argon/hydrogen (5%) atmosphere. Citric acid was used as the carbon source. Scanning electron microscopy (SEM) showed that the materials had spherical morphology. The electrochemical properties of the cathode were also estimated by the rechargeable capacity and cycle performance. The first discharge capacity of C/LiMn_(1-X)Zn_XPO_4 (X = 0.1) was approximately 60 mAh/g at 0.1 C.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Preparation and Characterization of Pd-Based Optical Hydrogen Sensor Operated at Room Temperature by Using Photodeposition Process

    Jun-ichi HamagamiRyo ArakiHiroyuki OdaMototsugu Sakai...
    P.100-104页
    查看更多>>摘要：Palladium (Pd) nanoparticles were prepared on photocatalytic TiO_2-coated glass substrate by a photodeposition process and the optical hydrogen sensing properties were examined at room temperature. The TiO_2 coatings were prepared on a non-alkaline glass substrate by a sol-gel process and hot water treatment. Pd nanoparticles were deposited on the TiO_2 film by photodeposition using UV light. The obtained Pd/TiO_2 thin film showed remarkable optical transmittance response to hydrogen gas at room temperature. The normalized transmittance of the Pd/TiO_2 thin film at a wavelength of 640 nm decreased to 0.9 on exposing the film to hydrogen gas for only 5 s. This transmittance decrease is considered to be due to a gaschromic effect of the TiO_2 photocatalytic coating.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Synthesis and lithium ion conductivities of zirconium phosphate-based solid electrolytes

    Kazuto IdeShinya SuzukiMasaru Miyayama
    P.105-108页
    查看更多>>摘要：The lithium ion conducting properties of lithium- and M~(IV) (M = Al, In, Y)-doped zirconium pyrophosphates synthesized via solid state reaction were investigated. The ionic conductivity of the compounds increased with increasing Li content. The activation energy of Li_xM_xZr_(1-x)P_2O_7 decreased as the lattice parameter increased owing to the enlargement of the size of bottleneck between the cavities. Li_(0.55)(Li_(0.15)Y_(0.1)Zr_(0.75))P_2O_7 with a high Li content and a large lattice parameter exhibited a conductivity of 1.7×10~(-3) S cm~(-1) at 350 ℃, which is sufficient for its application as a solid electrolyte for sensors.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Development of positive electrode materials for the high rate lithium ion battery by nanostructure control

    Eiji HosonoHirofumi MatsudaMasashi OkuboTetsuiichi Kudo...
    P.109-112页
    查看更多>>摘要：Previously, we reported the fabrication of Na_(0.44)MnO_2 and LiMn_2O_4 single crystalline nanowire structure. Moreover, these electrodes showed good high rate property as lithium ion battery, because the nanostructure electrode is suitable for high rate lithium ion battery. Especially, the fabrication of LiMn_2O_4 single crystalline nanowire was very interesting results because the synthesis of 1 -dimesional single crystal structure of LiMn_2O_4 is very difficult based on cubic crystal structure without anisotropic structure. The LiMn_2O_4 single crystalline nanowire was obtained thorough the self template method using Na_(0.44)MnO_2 nanowire. In this paper, we report the fabrication of Na_(0.44)MnO_2 and LiMn_2O_4 single crystalline nanowire structure and the property of lithium ion battery as review paper.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Preparation of cathode materials for a lithium-ion battery using an industrial microwave furnace

    Masashi HiguchiKota SuzukiKeiichi KatayamaToshiki Nakamura...
    P.113-116页
    查看更多>>摘要：Cathode materials for a lithium-ion battery were prepared using an industrial microwave furnace. The prepared materials were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), and electrochemical properties. Single-phase LiMn_2O_4 powders could be prepared in a few minutes using an industrial microwave furnace. The obtained results showed that this microwave heating method is a promising industrial technique for efficient preparation of cathode materials.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Influence of Sintering Behavior of ZnO Nanoparticles on J-V Characteristics of ZnO-Based Dye-Sensitized Solar Cells

    Shintaro UenoShinobu Fujihara
    P.117-120页
    查看更多>>摘要：Dye-sensitized solar cells (DSSCs) are one of the promising photovoltaic devices because of their lower manufacturing cost and higher energy conversion efficiency. Wide-gap, porous semiconducting metal oxides are generally used as electrode materials of DSSCs. Previously we utilized ZnO as DSSC electrodes and achieved a high conversion efficiency of 6.58% by improving the structure of ZnO films. However, open-circuit voltage (V_(OC)), one of the factors to determine the performance of DSSCs, was still at a lower level (≈ 0.60 V) than that of common TiO_2-based cells. We believe that the lower V_(OC) is due mainly to the occurrence of recombination. In this work, we tried to enhance V_(OC) by controlling the heating process of electrodes and suppressing the recombination for further development of ZnO-based DSSCs. As a result, we have achieved a higher V_(OC) of 0.725 V, confirming that the sintering behavior (grain growth and/or necking of grains) influenced largely the characteristics of DSSCs.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Rapid Low-temperature Synthesis of Porous ZnO Nanoparticle Film by Self-hydrolysis Technique

    Xiulan HuYoshitake MasudaTatsuki OhjiKazumi Kato...
    P.123-126页
    查看更多>>摘要：Porous nano-scale ZnO particle film was rapidly synthesized from a mixing solution of zinc acetate dihydrate - acetone at about 90 ℃. The crystal structure and morphology were clarified by the X-ray diffraction and a field emission scanning electron microscope. The evaporation of higher vapor pressure acetone resulted in the hydrolysis of zinc salt in itself crystalline water. Three morphologies of ZnO (dispersed nanoparticles, dispersed bread chip-shaped particles and flower-like bread chip-shaped assemblies) were observed.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Magnetic and Dielectric Properties of Cr_2O_3/LiNbO_3/Cr_2O_3 multi layer

    Takeshi YokotaYasutoshi TsuboiShotaro MurataShinya Kito...
    P.127-130页
    查看更多>>摘要：We proposed a new type of multi-ferroic system using magnetoelectric (ME:Cr_2O_3) material/ultra-thin ferroelectric materials (FE)/a magnetoelectric material hetero structure. This ME and FE heterosystem showed a general Polarization - Electric field hysteresis curve. When a magnetic and electric field (ME field) was applied at the same time, a decrease of polarization was observed. This might be due to the antiferromagnetic domain alignment of Cr_O_3 by the ME field.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd