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Dense ceramic hollow fibre membrane for oxidative coupling of methane

Dense ceramic hollow fibre membrane for oxidative coupling o...

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2006年中国固态离子学暨国际电动汽车动力技术研讨会

作者： Xiaoyao Tan and Zhaopao Pang College of Chemical Enginemng, Shandong University of Technology, Zibo, Shandong, PR China, 255049

Dense ceramic membranes are based on the ionic transport mechanism under the electrochemical potential gradient for gas permeation. They are fabricated from ionic and electronic mixed conducting ceramic oxides usually of perovskite structure that conduct charged species such as oxide ions, protons and electrons/electron holes at elevated temperatures. Such dense ceramic membranes have significant future potential for the industrial gas and energy industries with a wide variety of applications, for example the separation of oxygen from air, and the catalytic conversion of paraffins into olefins. However, in order to develop the membrane system for industrial use, it is essential to improve not only the oxygen permeation flux of the membrane materials, but also the ceramic membrane systems, which are stable in the hash environment. La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF), an oxygen ion and electron hole mixed conducting ceramic, hollow fibre membranes have been prepared successfully by means of a phase inversion spinning/sintering technique, where polyethersulfone (PESf) is used as a binder, N-methyl-2-pyrrollidone (NMP) as solvent and polyvinylpyrrolidone (PVP, K16-18) as an additive, respectively. Such membranes in the hollow fibre configuration can provide much larger effective area per volume, and can remarkably reduce the resistance to oxygen permeation due to the asymmetric structure (i.e. a thin separating dense layer integrated with the porous layers). Using the prepared LSCF hollow fiber membranes with the gas-tight property, a hollow fibres membrane reactor has been fabricated for oxidative coupling of methane (OCM). The performances of the membrane reactor at different operating modes, operating temperatures and feed flow rates have been investigated experimentally. The results indicate that the maximum C2 yield may reach 15.3% with the corresponding selectivity of 33.8% in the hollow fibre membrane reactor at 950 ℃ wehn the feed flow rates of CIV Ar mixture and ai

关键词： Hollow fibre membrane reactor methane coupling

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Design of Intergrated Motor Assistant System of Hybrid Vehicle

Design of Intergrated Motor Assistant System of Hybrid Vehic...

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2006年中国固态离子学暨国际电动汽车动力技术研讨会

作者： Zeng Jie, Liyan Zhang,Guilin Li ,Li Hui School of Electrical Engineering,Dalian Jiaotong University, Liaoning,Dalian 116028 China

Hybrid power automobiles adopt small capacity, light, high speed, good exhausting engines to meet the cruising demands, and using motor or other assistant equipments to provide additional power for speedup and climbing. This method can improve the efficiency of the automobiles and keep the performance of the automobiles. In addition, hybrid power automobiles can recycle braking energy, which is impossible for the traditional automobiles. For the traditional automobiles, the braking energy is wasted as heat exhausting. But for the hybrid power automobiles, the driving motor shift to generating electricity mode, which can recycle and store the "deserting energy", and be helpful to the braking. Base on the analysis of the blending modes, parallel connection blending mode is no doubt the best choice, and the assistant integrated motor system of parallel connection system is the high efficiency power system composed of motor and the controlling modules of the motor. This system adopts engine as the main power source, and motor as the supplement of the power. What's more, the weight is lighter by using these two power systems compared to the system which only uses motor as the power source. The structure of the system is composed of motor, motor driving module, motor controlling module, high voltage battery group, battery management module, DC-DC converter and so on. due to the excellent performance of CAN BUS, the communication among hybrid power automobile MCM, ECM and BCM controllers adopt CAN protocol. According to the different driving state of hybrid power automobiles, the working state of the assistant motor system can be discussed in four circumstances. For different circumstance, the energy distribution is different. The analysis of these two points are the basis of the whole automobile control strategy. The solution for the hybrid power automobile integrated motor assistant system has been carried out on the bus, which is developed by CAS Dalian Chemistry and Ph

关键词： hybrid power. Fuel-cell CAN bus. motor. DC-DC, inverter.

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Electrochemical Performances of Co-B Alloy Powders for Alkaline Secondary Batteries

Electrochemical Performances of Co-B Alloy Powders for Alkal...

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2006年中国固态离子学暨国际电动汽车动力技术研讨会

作者： Chuan WU, Li-wei DONG, Feng WU, Ting BAI, Guo-qing WANG School of Chemical Engineering and the Environment, Beijing Institute of Technology, Beijing 100081, China National Development Center for High Technology Green Materials, Beijing 100081, China

Some metal borides showed good catalytic activities on hydrogenation or dehydrogenation reactions for some organic compounds, among which Co-B alloys were found to be efficient for hydrogen generation from sodium borohydride. Recently, it's reported that ultrafine amorphous alloy powders of Co-B show superior electrochemical activities when used as anodic materials both in aqueous primary batteries and in secondary batteries. The exceptional high capacities of the metal boride alloys are found due to the electrochemical activation of boron atoms in the highly dispersed transition metal atoms, which alleviates the passivation of the transition metal by clamping the electrode potential to a negative region. What's more, both of the several electrons action of the boride alloys and the special amorphous structure of the nanosized powders ensure the excellent capacity. However, the effect of the structural evolutions of the Co-B alloy powders on the electrochemical activities has not been reported. In this work, Co-B alloy powders were synthesized and tested for possible use as anode materials in alkaline secondary batteries. Amorphous Co-B alloy powders were synthesized by chemical reduction of bivalent cobalt chloride with aqueous sodium borohydride solution. The as-prepared powders were vacuum-dried and treated at various temperatures form SOoC to 700oC for crystallizations. Subsequently, the electrochemical characteristics of these materials as anodes in alkaline aqueous solution were tested and discussed. With increasing heat-treating temperatures, the Co-B alloy powders change form an amorphous phase to a mixture of CoB and metal Co;and finally get a pure metal Co phase. The structural evolutions of Co-B alloy powders have notable effects on their electrochemical performances. The discharging curve of the battery is almost the same as usually observed for the Ni-MH batteries based on conventional hydrogen storage alloys. It was found that the Co-B alloy powder tre

关键词： Alkaline secondary batteries, Co-B alloy powders, capacity

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The Preparation and Properties of PEO-LiBOB Polymer Electrolytes

The Preparation and Properties of PEO-LiBOB Polymer Electrol...

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2006年中国固态离子学暨国际电动汽车动力技术研讨会

作者： Li Cheng, Bitao Yu, Fushen Li Weihua Qiu Department of Inorganic Nonmetal Materials, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083(China)

In 1973, Wright and co-workers discovered that polyethylene oxide (PEO) blent with a salt could be used as an ion conductor. Since then, solid polymer electrolytes (SPEs) have been widely investigated for their potential applications in lithium batteries. The merits of these systems are good mechanical stability, safety, and flexibility in shapes and sizes. However, there are still some problems to be solved for PEO-LiX polymer electrolytes. The main problem is the low ion conductivity of PEO electrolyte at ambient temperature because of its crystalline nature. PEO-LiX electrolytes has an ambient conductivity on the order of 10-7S·cm-1, which is far below the required conductivity 1×10-3S·cm-l for practical electrolytes. Therefore, How to inhibit polymer crystallization and reduce glass transition temperature Tg is the approach to solve the low ambient conductivity problem. Large research efforts have been made, such as finding the salt with lower dissociation energy, modifying polymer chain segment, doping organic plasticizers or inorganic fillers. A new class of lithium salt LiBOB has attracted much attention in recent years. We chose LiBOB as polymer electrolyte salt because of its relative large anion and low dissociation energy. Since ceramic fillers could prevent crystallization of the polymer chains and provide specific surface interactions with the electrolyte components, nano-SiO2 power was added to PEO-LiBOB polymer electrolyte in hopes of achieving higher conductivity and improving the electrochemical properties of electrolyte. In this work, the PEO-LiBOB polymer electrolytes were prepared by solution casting method. The influences of PEO molecular weight, the content of the lithium salt, and temperature on the conductivity of polymer electrolytes were studied. The result showed PEO-LiBOB electrolytes exhibit improved conductivity. In addition, self-synthesized nano-sized SiO2 powder was added into PEO-LiBOB system to form nanocomposite polymer electrolyt

关键词： Polyethylene oxide(PEO) Polymer electrolyte Lithium batteies

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Synthesis and electrical properties of Sr1+xLa（1-x）ALO（4-δ）（x=0;0.05;0.1;0.15;0.2）

Synthesis and electrical properties of Sr1+xLa（1-x）ALO（4-...

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2006年中国固态离子学暨国际电动汽车动力技术研讨会

作者： Liping SUN, Hui ZHAO , Lihua HUO, Shan GAO, Jinggui ZHAO (Laboratory of Functional Materials, School of Chemistry and Materials Science, Heilongjiang University, Harbin, 150080)

Materials formulated Sr1+xLa1-xAlO4-δ (x =0;0.05;0.1;0.15;0.2) with the pseudoperovskite K2NiF4 type structure have been prepared for the first time and characterized by XRD, SEM and FT-IR. The XRD patterns show that the single-phase was formed at 1350 ℃ for each sample. In the infrared spectra of the samples, a wide band observed around 474 cm-1 can result from the random distribution of A1O6 octahedra in the perovskite layer. Another band at 680 cm-1 corresponds to the stretching vibration of the Sr/La-O(2) bond along the c axis as confirmed by Singh et al.. The assignment of the observed band at 593 cm-1 probably due to the Al-O(1) stretching mode. The electrical conductivity was investigated as a function of temperature (Fig. 1) and oxygen partial pressure. AC electrical conductivity studies revealed that the conductivity increased with the increasing of the value of x. The electrical conductivity of the materials was of p-type at near atmospheric pressures with conductivity of the order of 10-4 S cm-1 at 700 ℃. The results of the DC polarization measurement show that the non-stoichiometric compounds exhibited a mixed electrical conductivity. The maximum ion transfer number was achieved 60% when x was 0.15.

关键词： Sr1+xLa1-xAlO4-δ Synthesis Electrical properties

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Sr0.95CexCo0.2Fe0.8O3-δ （x=0.05-0.50） Cathodes for IT-SOFCs

Sr0.95CexCo0.2Fe0.8O3-δ （x=0.05-0.50） Cathodes for IT-SOF...

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2006年中国固态离子学暨国际电动汽车动力技术研讨会

作者： Wei Han, Jianfeng Gao Xingqin Liu and Guangyao Meng Department of materials science and engineering, USTC Jinzhai Road 96,230026, Hefei/Anhui, P. R. China

In order to develop a promising cathode for intermediate temperature solid oxide fuel cell (IT-SOFCs), the series of Sr0.95CexCo0.2Fe0.8O3-δ (SCCF, x=0.05-0.50) cathodes were investigated. The powders were synthesized by the glycine-nitrate-process (GNP) using the corresponding nitrates as starting materials and then calcined at 900 ℃ for 2 h in air. X-ray diffraction analysis was used for identifying structure, four-pole method for conductivities measurements, AC impedance technique for measurements of cathode polarization resistances. The results indicated that the materials with x=0.05-0.15 have a pure cubic phase (Pm3m- ). The second fluorite cubic phase (Fm3m) of CeO2 appeared as × ≥ 0.2 and the amount of CeO2 increases with x. For all studied samples, conductivity decreases with Ce content increase from 0.05 (106.6 Scm-1 at 400 ℃) to 0.50 (lower than 10 Scm-1 between 3 00 ℃-800℃). It was attributed to the increase of Ce4+ at A-sites which suppresses the valance change (3+/4+) of Co and Fe ions at B-sites and lowers the electron transport along B-O-B as x < 0.2. In the two-phase region the conductivity drops again to lower values due to the poor electrically conducting second phase CeO2. As for the electrochemical performances of the cathodes built up with YSZ and SDC, respectively, Sr0.95Ce0.15Co0.2Fe0.8O3-δ (sintered at 1000 ℃) showed the lowest polarization resistance on YSZ with 1.38 Ω cm2 (800 ℃, air,) while the lowest specific area resistance of Sr0.95Ce0.30Co0.2Fe0.8O3-δ on SDC electrolyte, 0.25 Ω cm2, was observed under the same conditions.

关键词： IT-SOFC Cathodes Sr0.95CexCo0.2Fe0.8O3-δ

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R&D ON Ni-MH BATTERIES FOR HYBRIDE ELECTRIC VEHICLE

R&D ON Ni-MH BATTERIES FOR HYBRIDE ELECTRIC VEHICLE

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2006年中国固态离子学暨国际电动汽车动力技术研讨会

作者： Huang Bing, Shi Pengfei Harbin Coslight Group Co., Ltd., Harbin 150086, China Dept. of Applied Chemistry, Harbin Institute of Technology, Harbin 150001, China

Nickel-metal hydride (Ni-MH) cell is a new rechargeable battery system that has excellent performance and fewer environmental problems. Ni-MH cell is presently the most promising battery system as power sources for hybrid electric vehicles (HEV) due to its characteristics such as high specific power, high energy density, long cycle life and good safely performance etc. The main research work of this dissertation was as follows: Firstly, the characteristics of Ni-MH cell were studied in detail, according to the demands of Ni-MH batteries for HEV applications. Secondly, The effects of heat treatment of negative electrode, additives of negative and positive, fill density and thickness of negative and positive were investigated. Lastly, the technology of preparation and formation of Ni-MH cell was optimized. And 6.5 Ah cylindrical Ni-MH cell and batteries were assembled. Property tests were also carried out for assembled Ni-MH cell and batteries systemically. According to the potential values at varying discharge rate, it was found that the voltage variation of cell was mainly caused by Ni(OH)2 electrode while charging/discharging at 1 C rate. And while pulse charging/discharging at high rate it was mostly affected by MH electrode. When the cell was pulse charging/discharing at high rate, the hydrogen atoms can't transfer to the surface of the MH alloy powder in time for electrochemical reaction. The electrode potential of the MH alloy electrode is far removed from the equilibrium potential, typically at a high overpotential. Which result in rapid rising or dropping of the voltage of cell. The 6.5 Ah cylindrical Ni-MH cell and batteries were assembled. And the capacity tests at high, medium and low temperature reached the target. The cells have fine power density and pulse charge/discharge capability. The results of short circuit test, crush test, nail sting test, work ability test of safety valve, fall test and heating test meet the goals of stabilization and safety. C

关键词： Ni-MH Cell, Hybrid Electric Vehicles (HEV), High Power

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Synthesis and Electrical Characterization of Doped Li3xLa0.67-xTiO3 with Al3+ and V5+

Synthesis and Electrical Characterization of Doped Li3xLa0.6...

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2006年中国固态离子学暨国际电动汽车动力技术研讨会

作者： Li Ronghua, Zi Liyun, Wang Wenji Department of Chemistry, Fuzhou University Fuzhou, Fujian 350002, China

Perovskite-type Li3xLa0.67-xTiO3 doped with double metal cations is found to be showed good lithium ion conductivity. In this paper lithium fast ion conductors of Li3xLa0.67-xAlyTi1-2yVyO3 system were prepared by high temperature solid state reaction using Al3+ and V5+ partly substituted Ti4+ in the perovskite parent. X-Ray powder diffraction showed that perovskite solid solution with orthorhombic structure was formed and no second phase was found in the ranges of the initial composition x=0.10, y≤0.075. However a second phase Al2O3 was observed when x=0.10, y>0.075. And the unit-cell volume decreases when Al3+ and V5+ substituted Ti4+ because the average ionic radius of Al3+ and V5+(55pm) is smaller than Ti4+ (68pm). The electrical characterization of the heat treated sample was carried out in the frequency range of 100mHz to 8MHz, and the Impedance plot and Equivalent circuit are analyed. The Z' versus Z" impedance plot generally consisted of a semicircle and an incline spike. The semicircle we think is owing to parallel capacitance the Cp(50nF) which is typical of a surface-layer or a grain-boundary effect and the inclined spike is due to a constant phase element (CPE) instead of double-layer capacitance(Cdl) which was caused by the roughness of the particle surface. The incline spike also indicated that the samples are nearly pure ionic conductors. The A.C. impedance measurements showed that the Li3xLa0.67-xAlyTi1-2yVyO3 system lithium-ion conductivities are of the order of 10-4 ***-1 at room temperature .and the compositions have low activation energies of about 20-26kJ/mol in the temperature ranges of *** total lithium ion conductivity of the system decrease with the increasing y . The reason is that the distortion of the perovskite type of parent structure while Al3+(r=51pm) and V5+(r=59pm) substituting Ti4+(r=68pm) lead to Li+ mobility decreasing , then the conductivity decreases. The decomposition voltages of the compositions that doped with Al3+

关键词： perovskite, conductivity, fast lithium ion conductor, a.c. impedance

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Ordered 1 dimensional ion channels of diblock copolymers with high anisotropic conductivity

Ordered 1 dimensional ion channels of diblock copolymers wit...

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2006年中国固态离子学暨国际电动汽车动力技术研讨会

作者： Kaori Kamata Motonori Komura Takeshi Yamada Hirohisa Yoshida Tomokazu Iyoda Chemical Resources Laboratory Tokyo Institute of Technology 4259 Nagatsuta Midori Ku Yokohama 226-8503 Janpan CREST Japanese Science and Technology 4-1-8 Hon-cho Kawaguchi Saitama 332-0012 Japan Chemical Resources Laboratory Tokyo Institute of Technology 4259 Nagatsuta Midori Ku Yokohama 226-8503 Janpan CREST Japanese Science and Technology 4-1-8 Hon-cho Kawaguchi Saitama 332-0012 Japan Department of Applied Chemistry School of Engineering Tokyo Metropolitan University Minarni-Ozawa 1-1 Hachioji Japan Deparuncnt of Applied Chemistry School of Engineering Tokyo Metropolitan University Minami-Ozawa 1-1 Hachioji Japan CREST Japanese Science and Technology 4-1-8 Hon-cho Kawaguchi Saitama 332-0012 Japan Chemical Resources Laboratory Tokyo Institute of Technology 4259 Nagatsuta Midori Ku Yokohama 226-8503 Japan CREST Japanese Science and Technology 4-1-8 Hon-cho Kawaguchi Saitama 332-0012 Japan

Anisotropic nanostructured materials are one of the current interests because a variety of novel phenomena are emerging when feature size of the material approaches to nanometer scale. Apparent anisotropy of ion transport has been observed from polymeric electrolyte with low dimensional ion-conducting channels. However, efficient lithium ion transport has only been obtained in plane of electrolytic film (i.e., ion-conducting channels are parallel to the film), which is not suitable for practical application. In this study, phase-segregated amphiphilic liquid crystalline diblock copolymer, P(EO)272-b-PMA(Az)102, has been successfully functionized as ion-conducting membrane with 1 dimensional ion transport pathway by simply mixed with LiCF3SO3. FTIR and DSC demonstrate that lithium salt is selectively dissolved in PEO nanodomain. AFM and S AXS reveal that ordered hexagonal arrangement of PEO nanocylinders are mainly retained after complexing copolymer with LiCF3SO3. Coaxially and vertically aligned PEO nanochannels render the maximum lithium ion conductivity achieved out of plane of polymeric film together with the highest anisotropic value of ion conduction around 110.

关键词： Block copolymer, anisotropic, ion, ordered, channel

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