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Volume 48, Issue 6
Special Issue of 46th Particle Technology Meeting
Displaying 1-11 of 11 articles from this issue
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Hirokazu Munakata, Takamitsu Tashita, Kiyoshi Kanamura, Akira Kondo, M ...2011 Volume 48 Issue 6 Pages 364-369
Published: June 10, 2011
Released on J-STAGE: June 21, 2011
JOURNAL FREE ACCESSMechano-chemical method was applied to develop a new composite catalyst consisting of tungsten carbide (WC) and platinum / carbon (Pt / C). The formation of Pt / C-WC composite particle was confirmed by TEM observation, in which we found that small Pt particles and thin carbon layer existed on the WC surface. The Pt / C-WC composite particle showed a similar catalytic activity with pristine Pt / C catalyst for hydrogen oxidation although the amount of Pt loading was about 1 / 4 of that for the Pt / C catalyst. This was confirmed in the fuel cell test as well as in the hydrogen adsorption / desorption behavior measured by cyclic voltammetry.View full abstractDownload PDF (1012K) -
Masahiro Yoshikawa, Yoshihiro Mugikura2011 Volume 48 Issue 6 Pages 370-375
Published: June 10, 2011
Released on J-STAGE: June 21, 2011
JOURNAL FREE ACCESSFor a molten carbonate fuel cell, the establishment of the manufacturing process technology of the α-LiAlO2 electrolyte matrix with aqueous solvent has the advantages on the environmental impact and the cost reduction compared to conventional technology with organic solvent. In this study, the behaviors of the α-LiAlO2 slurry were investigated when the aqueous solvent was used. As a result, it was clarified the best slurry condition was 60% or less of the water concentration in the binder solution when the 3% methyl cellulose solution was used as a binder. Moreover, the porosity and the mean pore size of the electrolyte matrix could be controlled 55 - 65% and 0.2 - 0.45μm respectively using this slurry. These are enough properties to apply to the electrolyte matrix. In addition, the operation tests and post test analysis of the MCFC single cell using this electrolyte matrix were studied. It was found that any remarkable difference was not seen between the electrolyte matrix that used an aqueous solvent and a conventional matrix that used an organic solvent.View full abstractDownload PDF (991K) -
Mitsunobu Kawano, Hiroyuki Yoshida, Toru Inagaki2011 Volume 48 Issue 6 Pages 376-380
Published: June 10, 2011
Released on J-STAGE: June 21, 2011
JOURNAL FREE ACCESSNiO-Ce0.8Sm0.2O1.9 (SDC) composite particles were synthesized by spray pyrolysis method using the starting solutions containing the components for NiO-SDC and various amounts of nitric acid. The particles had different surface morphology and specific surface area depending on the pH values of the starting solutions. High and consistent cell performance was obtained with an anode material synthesized using the solutions containing large amounts of nitric acid. The morphology and the specific surface area of NiO-SDC particles should play an important role of realizing a high performance. NiO-SDC particles with highly-dispersed NiO and SDC composite were also synthesized from the starting solution containing citric acid. The chelation of cations and polymerization with citric acid should result in dispersed-type particles. The cells with an anode prepared from dispersed-type particles calcined at 1000°C demonstrated high performance. Dispersed-type NiO-SDC composite particles are considered to be effective as an anode material for the improvement of SOFC performance.View full abstractDownload PDF (594K) -
Shinichi Hashimoto, Hanako Nishino, Yu Liu, Masashi Mori2011 Volume 48 Issue 6 Pages 381-388
Published: June 10, 2011
Released on J-STAGE: June 21, 2011
JOURNAL FREE ACCESSIn recent years, solid oxide fuel cells (SOFCs) operated at intermediate temperature range (500-800°C) are extensively researched due to cost reduction and wider applications. Co-sintering processing technology by combination of Ce0.9Gd0.1O1.95 (CGO) slurry and NiO-CGO composite is significantly important for such SOFC fabrication. In this study, we tried to control shrinkage and microstructure of NiO-CGO composites using several different types of NiO and CGO powders. We developed two different types of NiO-CGO composites. One is for conventional process and another is high shrinkage type for thinner CGO electrolyte formation. Finally, co-sintering process at 1400°C was also tried using the high shrinkage NiO-CGO composite and water-based CGO slurry, and thin CGO film was successfully formed on the NiO-CGO composite substrate. The microstructure of the NiO-CGO substrate is uniform and show to be the minute composite which can be expected low polarization resistance.View full abstractDownload PDF (1523K) -
Jun Yoshida, Shinji Nakanishi, Hideki Iba, Hiroya Abe, Makio Naito2011 Volume 48 Issue 6 Pages 389-395
Published: June 10, 2011
Released on J-STAGE: June 21, 2011
JOURNAL FREE ACCESSLiMnPO4 is an excellent candidate for a cathode material as future Li-ion batteries because of high potential (4.1V) and high thermal stability. However, it cannot be used in practical batteries because of the poor rate property. LiMnPO4 particles were composited with the carbon to compensate low electron conductivity. In this study, we investigated the relationships between carbon composited conditions and battery properties. The carbon layer became homogeneous with an increase in milling time. Furthermore, the fine carbon, such as ketjen black, affects to form the uniform carbon layer. The sample exhibited a specific capacity of 125mAh / g at 0.05C and 70mAh / g at 5C. This result was due to the factor that the uniform carbon layer compensated the electric conductivity on the surface of LiMnPO4 particles.View full abstractDownload PDF (847K)
Review
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Hideki Iba2011 Volume 48 Issue 6 Pages 396-402
Published: June 10, 2011
Released on J-STAGE: January 28, 2016
JOURNAL RESTRICTED ACCESSPlug-in hybrid vehicles （PHV） and/or electric vehicles （EV）, as sustainable-mobility, penetrate into the market rapidly. This review introduces some results of recent research, moreover some suggestions of fundamental technologies for breakthrough in innovative batteries for PHVs and EVs.View full abstractDownload PDF (1369K) -
Tohru Yamamoto, Yoshihisa Tochihara, Naoki Noda, Hiroyuki Akiho2011 Volume 48 Issue 6 Pages 403-411
Published: June 10, 2011
Released on J-STAGE: January 28, 2016
JOURNAL RESTRICTED ACCESSX-ray absorption fine structure analysis, XAFS, is powerful technique for probing the local and electrical structure of industrial material, such as fuel cell, catalyst and batteries. This paper introduces the typical XAFS analysis technique and recent our research topics using synchrotron radiation X-ray of SPring-8.View full abstractDownload PDF (1298K)
Technical Note
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Akihiro Kinoshita, Satoshi Akiyama, Hiromitsu Suzuki, Tetsuo Sakai2011 Volume 48 Issue 6 Pages 412-416
Published: June 10, 2011
Released on J-STAGE: January 28, 2016
JOURNAL RESTRICTED ACCESSIt requires a long heating time and a lot of energy to synthesize lithium manganese oxide as cathodes for Li-ion batteries by conventional solid reaction methods. In order to achieve the low energy process, we focus attention on particle sizes of raw materials. It was shown that reducing particle sizes of raw materials was effective in saving energy in heating process of lithium manganese oxide.View full abstractDownload PDF (573K) -
New Specialized Equipment for Particle Design and Applications to Manufacturing the Battery MaterialOsamu Ishikawa2011 Volume 48 Issue 6 Pages 417-421
Published: June 10, 2011
Released on J-STAGE: January 28, 2016
JOURNAL RESTRICTED ACCESSThe powder technologies such as mixing, grinding, dispersion and granulation are used for manufacturing the battery material. They are used in all industrial fields, for example, ink, paints, electronic material, medical supplies, cosmetics and food. The powder processing equipments have been actively developed in order to meet the progressing demands from them.
In this paper, we will introduce new particle design equipment "COMPOSI", that will create new functional particles with those powder technologies, compositing, surface modification, coating, encapsulation and shape control.View full abstractDownload PDF (1226K) -
Yasuyoshi Sekine2011 Volume 48 Issue 6 Pages 422-426
Published: June 10, 2011
Released on J-STAGE: January 28, 2016
JOURNAL RESTRICTED ACCESSIn the beads mill the diameter of the beads is important for the grinding/dispersion performance and the specific energy consumption, and in this paper the finding is reported that the ratio of the vessel length to the vessel diameter （L/D） and the material have great influence on the specific energy consumption as a result of optimizing the shape and material of the grinding vessel. Further, in addition to the optimization, a multi-pass type beads mill is also introduced which has the possibility to allow a continuous one-pass process to perform the equivalent of the process which is conventionally performed in several passes.View full abstractDownload PDF (697K) -
Yoshiyuki Inoue, Ayuta Oishi2011 Volume 48 Issue 6 Pages 427-433
Published: June 10, 2011
Released on J-STAGE: January 28, 2016
JOURNAL RESTRICTED ACCESSThe industry and business world are very interested in Lithium ion battery （LIB）, however, R & D of new materials are necessary because some problems still remain. These shapes of new material are particle then the powder technology is necessary to bring out the performance of its. The authors show these important technologies as follows.
・Milling technology for recent trend and its answer
・Particle size distribution and its problem on fine particles
・Synthesis technology of nano particles which is based on flame synthesis
・Countermeasure for nano risk which is called as containment technology
・Dry particle composing technology for improvement of battery performanceView full abstractDownload PDF (1260K)
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