巻号一覧
1994 巻 (1994)
- 165 号 p. 255-
- 164 号 p. 193-
- 163 号 p. 115-
- 162 号 p. 61-
- 161 号 p. 2-
1994 巻, 165 号
選択された号の論文の9件中1～9を表示しています
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Kiyoshi Horita, Satoshi Kubota, Hideki Matsuoka1994 年 1994 巻 165 号 p. 255-260
発行日: 1994/12/30
公開日: 2010/06/28
ジャーナル フリーWe have investigated the surface properties, such as electric conductivity, wettability, rate constant of H2O2 decomposition, and surface functional groups, of surface modified carbon black by low temperature oxygen plasma of dc glow discharge under various processing conditions. This work also describes the relationships between the surface properties and the electrochemical behavior in an aqueous KOH solution of the gas diffusion electrodes with oxygen plasma modified carbon black. The results are as follows: The conductivity of carbon black has decreased with the plasma output. The carbon black surface has changed from hydrophobic to hydrophilic. The plasma processing has enhanced the H2O2 decomposition ability of carbon black. These results can be explained by theincrease of oxygen-containing functional groups such as>C=O, -COOH etc. on carbon black surface. The polarization behavior of an oxygen electrode with carbon black has been much improved by the plasma processing. It can be attributed to the formation of the stable three phase zones owing to the moderate wettability, high H2O2 decomposition ability, and development of fine pores of the carbon black electrode抄録全体を表示PDF形式でダウンロード (648K) -
原 亨和, 佐藤 麻子, 高見 則雄, 大崎 隆久1994 年 1994 巻 165 号 p. 261-268
発行日: 1994/12/30
公開日: 2010/06/28
ジャーナル フリーThe effect of the surface structure of mesocarbon microbeadson charge-discharge characteristics as anodes for secondary lithium-ion batteries was investigated. SEM (Scanning Electron Microscope) and Raman spectroscopy suggested that the mesocarbon microbeads had a more highly graphitized carbon layer on the surface than the inner carbons. The carbon layer caused the small capacity or the short cycle life as the anode. The heat-treatment of the mesocarbon microbeads in air for removing the surface layer gave a good effect on the capacity and the charge-discharge cycle for the anode.抄録全体を表示PDF形式でダウンロード (1426K) -
尾崎 純一, 三井 正彦, 西山 〓行1994 年 1994 巻 165 号 p. 269-274
発行日: 1994/12/30
公開日: 2010/06/28
ジャーナル フリーIron-carbon composites were prepared by polymerization and carbonization of furfuryl alcohol mixed with ferrocene, and their electrochemical behavior in a redox reaction of Fe (CN) 6-3 was investigated mainly by cyclic voltammetric (CV) technique. The cyclic voltammogram changed by the introduction of iron from irreversible one to reversible one with the narrowing of the potential difference between anodic and cathodic peaks. The heterogeneous charge transfer constant ks of the composite electrode with the highest iron content, Fe (3)-PFA, was comparable with platinum electrode, and was the highest among various type of carbon electrodes including polycrystalline graphite, pitch coke, and carbonized poly (vinyl acetate). On the other hand, ks of the composite specimen with a smaller iron content, Fe (1)-PFA, was comparable with polycrystalline graphite. Acid washing of iron-carbon composites by concentrated HC1 could not remove all of the iron species, but the ks of Fe (3)-PFA was diminished by a factor of 4-5. The effect of iron was concluded to be promotion of carbonization and/or graphitization and to accelerate the heterogenious charge transfer at the surface of the electrode. The latter effect was observed only when greater amount of iron was introduced than that needed for promotion of carbonization and/or graphitization.抄録全体を表示PDF形式でダウンロード (1019K) -
Masato Kurihara, Kazuya Ichimura, Takashi Miura, Tomiya Kishi1994 年 1994 巻 165 号 p. 275-281
発行日: 1994/12/30
公開日: 2011/07/05
ジャーナル フリーSeveral WCL6-graphite intercalation compounds (GICs) were prepared by heating graphite and WCL6 in a vacuum-sealed glass tube at 400°C. The cathodic behavio of WCL6-GIC was investigated by the galvanostatic and cyclic voltammetric measurements in non-aqueous solutions (1 mol·dm-3 LiClO4 in propylene carbonate (PC) or dimethyl sulfoxide (DMSO)). Electrochemical lithium insertion proceeded in two steps as was the case for CrO3- and MoCl5-GICs. The first and the second lithium insertion steps were considered to correspond to the insertion of desolvated Li+ ion and that of solvated Li+ ion, respectively. The first step was more reversible than the second one. The insertion of solvated Li+ ions to WCL6-GIC might increase the irreversibility of insertion/extraction process of lithium.抄録全体を表示PDF形式でダウンロード (816K) -
遠藤 守信, 中村 順一, 雀部 豊, 高橋 哲哉, 稲垣 道夫1994 年 1994 巻 165 号 p. 282-287
発行日: 1994/12/30
公開日: 2010/06/28
ジャーナル フリーLithium secondary battery using carbon as negative electrode, where Li is stored, has been developed. In the present paper, various kinds of carbon fibers with different macroscopic and crystallographic structure are applied a negative electrode for the lithium secondary batteries with 1molLiClO4/propylene carbonate electrolyte. And the battery performances of the fibrous electrode are characterized and evaluated as a function of the structural features of the fibers.
Li insertion mechanisms into carbon fiber negative electrode are classified into three groups from charge-discharge and the voltammetry measurements. The intercalation takes place in well-ordered graphite fibers, and the doping of Li occurs in the low crystalline, disordered, carbon fibers. Carbon fibers with intermediate crystalline structure indicate voltammograms between well-and disordered carbon fibers. Charge capacities of the fibrous anodes depend upon the crystallinity. Well-ordered and disordered carbon fiber electrodes exhibit larger capacity than those with intermediate crystallinity. It is evidently shown that the crystallinity of the fibrous carbon electrode is an important factor for desig of the cell performances in Li secondary battery.抄録全体を表示PDF形式でダウンロード (1084K) -
戸村 啓二, 松谷 陽子, 内田 勇1994 年 1994 巻 165 号 p. 288-292
発行日: 1994/12/30
公開日: 2010/06/28
ジャーナル フリーThe phase transition caused by electrochemical intercalation of lithium into graphite electrodes has been investigated in 1M LiClO4/propylene carbonate (PC) and PC+ ethylene carbonate solutions by using a newly designed electrochemical cell which allows electrochemical in situ X-ray diffraction (XRD) measurements. Our cell had a thin film of polypropylene as an X-ray window, and working (carbon sheet) electrodes were hot-pressed to the window. The well distinguished C (100) and C (101) peaks present at a high 2θ region as well as the C (002) peak were measured as a function of electrode potential, and it was suggested that the stacking transition takes place at a narrow potential range around 0.2V vs. Li, which corresponds to a transition region from the second stage to a higher stage.抄録全体を表示PDF形式でダウンロード (567K) -
上井 敏治, 山田 朝明, 竹井 勝仁, 岩堀 徹1994 年 1994 巻 165 号 p. 293-297
発行日: 1994/12/30
公開日: 2010/06/28
ジャーナル フリーAs a possible negative electrode material for lithium secondary cells, various carbon black (CB) samples prepared by the oil-furnace process and having different microscopic structures were investigated in an LiClO4-ethylene carbonate/dimethoxyethane (1/1 by volume) solution. CB samples were characterized by the average particle size (dn), the BET specific surface area (SN2), the amount of dibutylphtalate absorption and the micropore volume (Vm, mercury porosimetry). The irreversible capacity at the initial reduction stage increased with incresing SN2, that is, coarse elementary particles led to small irreversible capacity. There were two couples of redox processes in a cyclic voltammogram. With increasing Vm, the anodic peak current at around 0.2V became larger, whereas that at 0.9V remained constant. The intercalation/deintercalation of Lithium into/from layer-structured portion of CB material was considered to take place at 0-0.2V mainly at the neck position connecting two elementary particles.抄録全体を表示PDF形式でダウンロード (748K) -
Akihiro Mabuchi1994 年 1994 巻 165 号 p. 298-306
発行日: 1994/12/30
公開日: 2010/06/28
ジャーナル フリーIn recent years much attention has been devoted to various carbon anode materials for rechargeable lithium batteries. Carbon materials have a large variety in structures, textures, forms, particle sizes, and so on. In this paper, the studies on the carbon materials are reviewed from three viewpoints; their charge-discharge characteristics, reaction mechanisms and modification of the materials.抄録全体を表示PDF形式でダウンロード (1165K) -
渡辺 政廣1994 年 1994 巻 165 号 p. 307-314
発行日: 1994/12/30
公開日: 2010/06/28
ジャーナル フリーCathodes in phosphoric acid fuel cells operate under strongly oxidizing condition, in difficult electrolytic environments. Electrochemical corrosion limits the working cathode potential as well as the fuel cell lifetime. Various kinetically stable carbons permit the possibility of inexpensive cathode construction materials and catalyst supports that are stable in hot phosphoric acid. The paper reviews the functions required to carbons used in the cells, the corrosion behaviors of various carbons, methods improving the corrosion tolerance to the difficult environments and a new approach to extend the lifetime by modifying carbon black surface with fluorinated polyethylene.抄録全体を表示PDF形式でダウンロード (1030K)
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