锂离子电池正极材料表面包覆的研究进展

锂离子电池正极材料是锂离子电池发展的关键。对锂离子电池正极材料进行包覆是改善其性能的有效方法。锂钴氧和锂锰氧正极材料表面包覆后的循环性能,特别是高温下的循环性能可以得到有效的改善。对于LiFePO4来讲,表面包覆主要是解决这类正极材料导电性问题。文章综述了国内外锂离子电池材料表面包覆的研究现状,提出了作者对将来研究方向的一些看法和建议。     

锂离子电池正极材料LiNiO_2的研制

综述了锂离子电池正极材料国内外研究及应用现状 ,提出了锂离子电池充放电作用机理和对正极材料的技术要求 ,着重研究了 Li Ni O2 材料的合成方法和性能特点 ,给出了最佳制备工艺条件     

锂离子电池正极材料的发展简介

锂离子电池的发展受到了广泛的重视,正极材料是锂离子电池的关键因素之一。本文按结构类型对锂离子电池正极材料进行了分类,介绍了结构、机理及改性措施。     

高功率锂离子电池研究进展

高功率快放型锂离子电池是目前锂离子电池领域研究的重点方向之一。为了获得具有高功率密度的锂离子电池,正极材料须具有较高的电压和较高的电子与离子导电率,正极材料主要包括高电压钴酸锂、镍锰酸锂和高电压三元材料,负极材料包括碳系材料、钛基材料和金属氧化物材料,以及为提高首效和降低负极电位而采用的预嵌锂方法,并对锂离子电池电解液用锂盐、溶剂和添加剂进行了综述。最终总结了功率密度测试方法,并对高功率锂离子电池的研究进行展望。      

我国锂离子电池正极材料发展现状及趋势

锂离子电池正极材料的发展引领着锂电池的发展,文章引用统计数据说明目前国内外锂电池正极材料的产量,总结了五种锂离子正极材料的性能特点,指出目前和未来锂离子正极材料的发展方向。     

锂离子电池球形正极材料的制备研究进展

锂离子电池正极材料-LiCoO2、LiNiO2、LiMn2O4的粉末颗粒形貌直接影响到材料的电化学性能,由于球形粉体颗粒间的堆积空隙较少,粉体堆积密度较高,会使锂离子电池的电化学性能得到进一步的提高,因此球形化是锂离子电池正极材料的重要发展方向.本文主要介绍了锂离子电池球形LiCoO2、LiNiO2派生物、LiMn2O4正极材料的制备方法,并对这些球形正极材料的电化学性能同相应的非球形正极材料进行了比较,希望能够为锂离子电池材料的研究者提供借鉴.     

锂离子电池界面反应活化能应用研究

运用EIS法研究了锂离子正负极材料扣式电池和全电池的界面电荷传递过程，结合Arrhenius方程分别得到了锂离子电池正、负极材料扣式电池和全电池的界面反应活化能。结果表明，正极扣式电池界面反应活化能与正极材料本身性质密切相关，随正极材料的不同而不同；负极碳材料扣式电池界面反应活化能变化较小，负极扣式电池界面反应活化能大于正极扣式电池。全电池界面反应过程活化能与负极界面反应活化能比较接近，说明负极界面反应过程是整个电池界面反应过程的“控制步骤”。     

球形锂离子电池正极材料的制备研究进展

球形锂离子电池正极材料-LiCoO2、LiNiO2、LiMn2O4及其掺杂材料具有堆积密度大、体积比容量高、电化学性能和加工性能优异等突出优点,是锂离子电池正极材料的重要发展方向,预计将在未来得以商品化。本文对以上球形正极材料的制备方法进行了归纳研究。     

层状Ni-Mn基锂离子电池正极材料进展

层状Ni—Mn基锂离子电池正极材料具有层状结构镍酸锂(LiNiO2)的高比容量以及尖晶石型结构锰酸锂(LiMn2O4)的高安全性、低价格等特点，是最有可能代替或部分代替LiCoO2的新型正极材料用于小型锂离子电池，同时也可望用作低成本、高安全性和大容量动力型锂离子电池的正极材料。本文综述了层状Li—Ni—Mn—O系化合物和LiNi1/3Mn1／3Co1/3O2的合成工艺、结构特点和电化学性能，阐述了层状Ni—Mn基锂离子电池正极材料的发展、研究开发现状和应用前景。     

Li-Ni-Mn-O锂离子电池正极材料研究进展

Li-Ni-Mn-O正极材料由于具有比容量高、资源丰富、价格便宜、污染少等优点,而被视为最具发展潜力的锂离子电池的正极材料之一,近年来受到广泛关注。综述锂离子电池正极材料Li-Ni-Mn-O的研究进展,阐述其结构特征、制备方法及电化学性能。指出这些材料目前存在的主要问题并介绍解决方法,最后指出Li-Ni-Mn-O正极材料的发展前景和今后的研究方向。     

转炉炉壳热应力分析

根据实际转炉建立实体模型。以有限元为手段,考虑了炉衬和炉壳材料的物性参数随温度变化的特点和炉衬与炉壳之间膨胀间隙,计算了转炉炉壳在温度载荷和炉衬膨胀压力同时作用下的热应力。所得结果可为转炉炉壳设计提供依据。     

焦炭热性能指标意义浅析

通过对焦炭在高炉内的历程及其变化规律的剖析,阐述焦炭热性能指标的意义,形象地把焦炭在高炉内的损耗分为三部分(M1,M2,M3)。指出M2对焦比及焦炭价格有一定的指导作用。     

Results of treatment of cancer of the cardia

Cancer of the cardia is traditionally discussed with cardiac cancer of the lower portion of the esophagus and upper gastric cancer invading the esophagus, and the specific characteristics of cancer of the cardia have never been clearly defined. We reviewed the outcome of 172 patients with adenocarcinoma of the cardia who had undergone radical surgery between 1949 and 1994 in the Division of Gastrointestinal Surgery of the Cancer Institute Hospital. The centers of the tumors were located within 2 cm above and below the boundary between the esophagus and the stomach, and their longitudinal diameter was less than 8 cm. We divided the patients into an early period (1949-1979; n = 79) and a late period (1980-1994; n = 93), and focused on the historical transition. There were no differences in patient gender or histology between the two periods. However, the late period was associated with fewer cases of esophageal invasion and shorter longitudinal diameter, as the age of the population advanced. The number of advanced cancers such as the localized and infiltrative type had decreased, and early cancer and early clinical stage had become more common, but despite the fact that the number of early cancers had increased, extended dissection, such as thoracic and paraaortic lymph node dissection, was performed more frequently. By clinical stage, the long-term outcome markedly improved in Stage I patient in the late period, and tended to improve in Stage II and III patients. This appears to have been attributable to the prevention of micrometastasis by extended dissection, although the number of early cancers is another major potential cause. There were no differences in the outcome of Stage IV patients between the two periods, and further advances in multimodality therapy must be awaited. The range of resection is basically proximal gastrectomy, and if there are adequate indications, the prognosis is favorable. In view of the status of lymphatic flow and lymph node metastasis, and long-term results, lateroaortic lymph node dissection is important. Since the number of early cancer patients has been increasing, if intraabdominal recurrence is prevented, intrathoracic lymph node dissection will contribute greatly to the outcome of such patients.     

The effect of amount of possession of the trait of hostility on accuracy of perception of hostility in others.

Some theories of personality hold that an individual's perception of others is influenced by his own personality characteristics; more specifically, that a trait of low social value will be projected more into others, and that insight into the possession of these characteristics reduces this distortion. These 2 hypotheses were tested by having a group of college students rate each other (including themselves) on degree of friendliness or hostility. Agreement with group rating about self yielded the insight score. In general, the hypotheses were supported; the "friendly" Ss were most accurate in their perception of others, and insight was positively associated with accurate perception. From Psyc Abstracts 36:04:4HL16M. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Effect of antibiotics of chemotaxis of human leukocytes

The effect of 20 different antibiotics on chemotaxis by human neutrophils was studied. Human leukocytes incubated with chloramphenicol, rifampin, sodium fusidate, and tetracyclines in vitro showed markedly depressed migration. The mechanisms by which these antibiotics affect leukotaxis are discussed.     

Quality of life of relatives of mental patients

Usage of quality of life of psychiatric patients' relatives as the parameter of estimation of the quality of psychiatric care is considered. By means of standard questionnaire elaborated by the authors as well as by means of both individual and group conversations the quality of life was analyzed in 40 relatives which lived together with psychiatric patients. Different spheres of their life and difficulties (financial, social-psychologic, production) were examined in families with such patients. The defects of psychiatric care that had direct influence on the quality of life of the psychiatric patients' relatives are outlined.