Electrochemical properties of Li ion polymer battery with gel polymer electrolyte based on polyurethane

Gel polymer electrolyte (GPE) was prepared using polyurethane acrylate as polymer host and its performance was evaluated. LiCoO₂/GPE/graphite cells were prepared and their electrochemical performance as a function of discharge currents and temperatures was evaluated. The precursor containing a 5 vol % curable mixture had a viscosity of 4.5 mPa s. The ionic conductivity of the GPE at 20 °C was about 4.5 × 10^–3 S cm^–1. The GPE was stable electrochemically up to a potential of 4.8 V vs Li/Li⁺. LiCoO₂/GPE/graphite cells showed a good high rate and low-temperature performance. The discharge capacity of the cell was stable with charge–discharge cycling.     

ABS接枝用聚丁二烯胶乳的存放稳定性研究

通过跟踪测定不同存放时间下聚丁二烯胶乳（PB胶乳）的pH值、粒径、表面张力、粘度、凝固物含量、机械稳定性等各项物性指标,对PB胶乳的存放稳定性进行了比较深入研究.     

顺丁橡胶生产中的混合问题

简述了顺丁橡胶的聚台和凝聚过程中的各种混合问题，并对其改进提出了建议。     

氯化氢合成余热的综合利用

介绍了运用新技术新工艺，对氯化氢生产过程中的余热进行综合利用的情况，不仅降低了环境的热污染，而且取得了一定的经济效益和社会效益。     

乳液聚合生产聚丁二烯胶乳聚合过程的研究

在工业生产中，以丁二烯为单体，采用分段控制温度和一步法合成乳聚聚丁二烯胶乳，各段聚合速率为１．７５％．ｈ＾－１，１．３０％．ｈ＾－１，０．８６％．ｈ＾－１。结果表明，当转化率小于５５％时，胶乳粒径逐渐增大，粒径的分散度和粒子的扩散系统缓慢降低；转化率大于５５％时，粒径和扩散系数变化很小，分散度则急剧下降。随着转化率的增加，聚合物的１，２－结构含量不变，顺－１，４和反－１，４结构含量呈无规律的变化，     

端硅烷化聚丁二烯改性单组分聚氨酯密封胶的制备和性能探讨

以端羟基聚丁二烯和聚醚二元醇为复合软段制备了性能优异的单组分端硅烷基聚氨酯密封胶并通过红外光谱对其进行了表征。探讨了烷氧基硅烷封端率及端羟基聚丁二烯的含量对单组分密封胶的力学性能、硬度及表干时间的影响。     

An Intermediate-temperature H2S Fuel Cell with a Li2SO4-based Proton-conducting Membrane

A laboratory-scale intermediate-temperature H2S fuel cell with a configuration of H2S, （metal sulfide-based composite anode）/Li2SO4＋Al2O3/（NiO-based composite cathode）, air was developed and studied for production of power and for desulfurization of a fuel gas process stream. The cell was run at typical temperature （600-650℃） and ambient pressure, but its electrochemical performance may be limited by electrolyte membrane thickness. The membrane and its performance in cell have been characterized using scanning electron microscope （SEM） and electrochemical impedance spectrum （EIS） techniques. Composite anodes based on metal sulfides, Ag powder and electrolyte behaved well and stably in H2S stream, and composite cathodes based mainly on nickel oxide, Ag powder and electrolyte had superior performance to Pt catalyst. The maximum power density of up to 70mW.cm^-2 and current density of as high as 250mA.cm^-2 were obtained at 650℃. However, the long-term cell stability remains to be investigated.     

MEASUREMENT OF WATER DIFFUSIVITY IN AQUEOUS LITHIUM BROMIDE AND LITHIUM CHLORIDE SOLUTIONS

A relatively simple method was employed for measurement of water diffusivity in aqueous lithium bromide and lithium chloride solutions. The twin bulb apparatus used for these measurements was developed using an analogy between this apparatus and the conventional diaphragm cell apparatus. Tritiated water (TOH) was used as a tracer for these experiments because of its chemical similarity and proximity to the molecular weight of water. High tracer activity used at the beginning of the experiments allowed the use of relatively shorter time duration for each experiment (s;≈ 20 h) and a quasi-steady state equation to calculate the diffusivity from the observed tracer activity data

Initially, the water diffusivity in lithium bromide solutions for concentrations varying from 0.5 M to 3 M (22.1 weight percent) was measured to obtain a comparison with published values. The lithium bromide concentration was further varied from 3 M to 11 M (57.4 weight percent) to obtain data in the concentration range usually employed in absorption cooling applications, which is near the solubility limit. The water diffusivity was found to vary with lithium bromide concentration, and to have a maximum of 16.7 × 10^-10m²/s at 4 M. These diffusivity values were also compared with those obtained using an equation proposed by Rosevaere etal. (1941) for nonideal solutions. The water diffusivity in lithium chloride solutions was measured at concentrations of 7 M (25.7 weight percent) and 8 M (28.87 weight percent) to obtain a comparison with published values. The lithium choride concentration was further varied from 8 M to 13 M (43.24) weight percent) to gather data beyond those of other researchers. Similar to the trend of water diffusivity in lithium bromide solutions, water diffusivity in lithium chloride solutions was also found to vary with concentration with a minimum of 6.2 × 10^-10m²/s near the solubility limit.     

端羟基聚丁二烯/聚醚型聚氨酯弹体的合成及性能

研究端羟基聚丁二烯／聚醚型聚氨酯弹性体的配方。探讨游离—ＮＣＯ含量、以Ｎ，Ｎ－二（２－羟两基）苯胺（ＩｓｏｎｏｌＣ－１００）为扩链剂时，扩链系数以及端羟基聚丁二烯／聚四氢呋喃并用比等对弹性体力学性能的影响。试验结果表明，游离—ＮＣＯ含量为８．５％，扩链系数为０．８９时，弹性体的综合性能优良；端羟基聚了二烯／聚四氢呋喃并用比减小时，能改善弹性体的拉伸强度和撕裂强度。电子显微镜观察证明弹性体中呈现明显的软段相区和硬段相区。     

一种翼艇式飞行器方案研究

文章提出了一种翼艇式飞行器方案,较好地解决了以低速在临近空间飞行的两个关键问题:①如何利用临近空间稀薄空气产生升力克服飞行器重量;②如何有效利用有限太阳能产生飞行器长时间飞行的动力。该飞行器采用了升浮一体飞行原理和昼夜节能运行模式,将夜间储能锂电池的重量大幅度减小,比临近空间飞艇的体积缩小一半左右,飞行速度有较大提高,对于有速度要求的任务载荷(如SAR)来说更适合。文中还建立了翼艇式飞行器的总体参数优化模型,并采用NSGAII得到了多种满足设计要求翼艇式方案,选择了非劣前沿解集中柺折处方案。将该优化模型和方法得到临近空间飞艇方案总体参数与洛马公司公布的高空飞艇总体参数进行了比较,结果较为接近,表明该优化模型和方法的准确性,对低速临近空间飞行器设计有一定的参考价值。