Possible use of methylbenzenes as electrolyte additives for improving the overcharge tolerances of Li-ion batteries

Based on the voltammetric behaviour of a series of methyl-substituted benzenes in 1M LiPF₆/EC-DMC electrolyte, xylene was selected and tested as an electrolyte additive for overcharge protection of Li-ion batteries. From the overcharge curves, CV behaviour and SEM observations of the cells in the presence of xylene, it was found that the additive can polymerize at the overcharged voltage to form a dense layer of isolating polymer film at the cathode surface, which blocks off further oxidation of the electroactive material and electrolyte and, therefore, improves the overcharge tolerance of the Li-ion battery. In addition, the xylene additive has shown only a slight influence on the cycling behaviour.     

添加物对ZrO2系快离子导体烧结性能的影响

本文介绍了１３２０℃下，ＣａＯ，Ｙ２Ｏ３等稳定剂，低融物组成及１－６价阳离子化合物对ＺｒＯ２烧结性能的影响并列举出材料的晶型及某些主要性能。     

RECURSIVE GENERALIZED M ESTIMATES FOR AUTOREGRESSIVE MOVING-AVERAGE MODELS

Abstract. Outliers in time series seriously affect conventional parameter estimates. In this paper a robust recursive estimation procedure for the parameters of auto-regressve moving-average models with additive outliers is proposed. Using 'cleaned' residuals from an initial robust fit of an autoregression of high order as input, bounded influence regression is applied recursively. The proposal follows certain ideas of Hannan and Rissanen, who suggested a three-stage procedure for order and parameter estimation in a conventional setting.
A Monte Carlo study is performed to investigate the robustness properties of the proposed class of estimates and to compare them with various other suggestions, including least squares, M estimates, residual autocovariance and truncated residual autocovariance estimates. The results show that the recursive generalized M estimates compare favourably with them. Finally, possible modifications to master even vigourous situations are suggested.     

Interaction of Aluminum with Detonation Products

A method of electrical conductivity and an analysis of recovered explosion products are used to study interaction of aluminum with detonation products of condensed high explosives. The electrical conductivity of HMX/Al and RDX/Al mixtures is inhomogeneous; a region with the maximum electrical conductivity is adjacent to the detonation front, whereas the electrical conductivity decreases with distance from the front. If the wave is incident onto a wall, the electrical resistance of the composite high explosive increases, which indicates that the high-conducting zone disappears. The electrical conductivity, resistance of the conducting zone, and the time of resistance growth are found as functions of the particle size of the additive. The results obtained confirm the reaction of the metal additive with detonation products in a microsecond range of time. An analysis of condensed explosion products shows that the reaction of aluminum with detonation products proceeds on the particle surface. The amount of reacted aluminum and the oxide-layer thickness are estimated. __________ Translated from Fizika Goreniya i Vzryva, Vol. 42, No. 1, pp. 120–129, Jnuary–February, 2006.     

有机化合物及聚合物的计算机辅助红外光谱法鉴定

建立了计算机辅助红外光谱法鉴定有机化合物及聚合物的新方法,介绍了计算有机化合物和聚合物的一些经验公式。程序设计首先收集、整理常用聚合物、有机添加剂和有机小分子的红外光谱数据,然后提取反映该物质特征的吸收峰数据,制作ACCESS数据库,利用VisualBasicDAO数据链接方式,根据查询要求动态链接数据库,利用要求查询的聚合物特性,经过经验公式的算法翻译,生成SQL查询语句进行查询。     

钛酸铝材料研究进展及应用

钛酸铝是一种优异的高熔点、低膨胀无机非金属材料。主要阐述了钛酸铝材料的微观结构，以及热分解、热膨胀及其影响因素。简述了钛酸铝材料的制备方法。讨论了合成的工艺条件及添加剂对钛酸铝材料性能的影响，并对其应用作了简单介绍。最后提出了改善钛酸铝材料性能的技术途径。     

水溶性聚合物在油田钻井液中的应用

介绍国内水溶性聚合物钻井液处理剂的研究与应用情况，水溶性聚合物可用泥浆降滤失剂，增粘剂，絮凝剂，降粘剂和防塌型，它包括天然高分子材料和合成聚合物。     

环氧大豆油的生产技术及其在PVC中的应用

介绍了聚氯乙烯增塑荆环氧大豆油的性质和生产原理，提出了国内环氧大豆油工业生产存在的问题；结合国外先进的环氧化技术提出了相应的改进方法，并介绍了所用的催化剂、工艺条件及稳定荆。同时阐述了环氧大豆油的卫生性及加工性。     

HDPE新牌号树脂的研究

根据扬子石化公司开发HDPE新牌号产品的生产经验,从分子量及分子量分布与树脂性能的关系、密度对HDPE性能的影响、HDPE的共聚改性、HDPE的共混改性、添加剂与HDPE改性等5个方面讨论了HDPE新牌号产品开发的方法。     

N-丙烯酰吗啉的合成

以丙烯酸、三氯化磷为原料合成丙烯酰氯,再与吗啉酰基化生成N-丙烯酰吗啉。产品纯度99.5%以上。