共查询到20条相似文献,搜索用时 46 毫秒
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详细阐述了锂离子电池正极材料Liδi1-x-yCoxMnyO2中镍、钴、锰含量的测定方法.采用化学分析方法(重量分析法和EDTA络合滴定法)测定样品中镍、钴、锰含量,精确度高,准确度好,回收率在97.00%~99.75%之间,较仪器分析更接近理论值,适用于规模化生产中的质量分析.适当调整分析试剂的用量后可以测试Liδi1-x-yCoxMnyO2系列组分中镍、钴、锰的含量,是一种普适分析锂离子电池正极材料Liδi1-x-yCoxMnyO2的方法. 相似文献
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详细阐述了锂离子电池正极材料LiδNi1-x-yCoxMnyO2中镍、钴、锰含量的测定方法。采用化学分析方法(重量分析法和EDTA络合滴定法)测定样品中镍、钴、锰含量,精确度高,准确度好,回收率在97.00%~99.75%之间,较仪器分析更接近理论值,适用于规模化生产中的质量分析。适当调整分析试剂的用量后可以测试LiδNi1-x-yCoxMnyO2系列组分中镍、钴、锰的含量,是一种普适分析锂离子电池正极材料LiδNi1-x-yCoxMnyO2的方法。 相似文献
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镉镍电池正极物质中钴含量的测定 总被引:1,自引:1,他引:0
镉镍电池正极物质中钴含量的测定 ,以前采用硫氰酸铵和钴形成兰色配合物 ,再用异戊醇萃取 ,经过吸光度测量 ,计算出钴含量 ,当钴和铁共有时 ,铁和硫氰酸铵生成红色配合物 ,一块被异戊醇萃取 ,对钴的测定带来干扰。为了消除铁的干扰 ,拟采用氨水和钴形成配合物 ,利用此配合物的颜色对钴作比色分析 ,探讨了镍、铁的干扰和氨水与钴形成配合物的条件。本方法的回收率为 95 %~ 10 2 % ,相对标准偏差≤ 2 .9% ,钴测定范围在 1%~ 10 % 相似文献
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介绍了2005年9月25~30日在韩国釜山召开的国际电化学学会第56届年会中有关二次电池的学术发展情况.着重指出了锂离子电池正、负极材料及电解质材料的研究发展趋势.改性尖晶石锰酸锂、锂镍锰钴氧三元复合氧化物、磷酸铁锂是目前正极材料的研究重点;锡、硅、锰等合金或与石墨的复合材料是未来很有前景的负极材料;凝胶聚合物电解质和聚合物固体电解质依然是锂离子电池电解质的研究重点. 相似文献
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The needs for emergency and standby power to enhance industrial and commercial power systems are frequently left wanting due to ignorance of the needs or of the systems available to satisfy the needs. This paper discusses various situations which require or desire emergency or standby power and mentions suitable systems for each application. The areas discussed include lighting, start-up power, transportation, mechanical utilities, heating, refrigeration, and production. 相似文献
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《Education, IEEE Transactions on》1970,13(3):176-180
The following paper describes the use of a simple FORTRAN computer program that may be used to determine course grades. The program is based on processing a set of IBM punched data cards. Each card contains the name of a student and all of his grades, including the final examination grade. The program may also be used to predict the final examination grade, based on previous quiz grades, and then, in turn, to predict the final course grade. It is thus possible to use this program periodically throughout the entire semester in order to provide the student, as well as the instructor, with a measure of his progress. 相似文献
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A novel machine family-dual-rotor, radial-flux, toroidally wound, permanent-magnet (RFTPM) machines-is proposed in order to substantially improve machine torque density and efficiency. After the principles of operation, configurations, and features are discussed, the machine design and optimization guidelines are given. A prototype has been designed, built, and tested. The measured torque density of the prototype, which well matches the design value, is almost three times of that of the induction machine with the same power of 3 hp and speed. Meanwhile the efficiency is still kept high and the material cost is kept low by using ferrite magnets. Three novel approaches are proposed to reduce the cogging torque in the RFTPM machines, whose validity is verified by finite-element analysis results and experimental measurements. 相似文献
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A variety of soft-switching techniques have been proposed to reduce the switching losses and EMI problems that occur with higher switching frequencies in hard-switched converters. In this paper, a new, quasi-resonant, soft-switched, three-phase inverter is presented which uses 12 thyristors as the power electronic switches, and hence has potential for use in high-power applications. The converter is fully current-regulated, suitable for high-performance motor drive applications, and is capable of 4-quadrant operation to allow regeneration back into the DC supply. The operation and the control of the inverter are described in detail and simulation and experimental results are presented 相似文献
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Industrial system grounding for power, static, lightning, andinstrumentation, practical applications
Practically every structural steel building erected for industrial use incorporates reinforcing steel bars installed in the concrete footings. This, without any additional effort, constitutes a grounding electrode. The quantity of electrodes is directly related to the building area. When the structural steel framework is erected and interconnected, these electrodes are also interconnected in a parallel arrangement. Similarly, high-voltage metal transmission towers are installed using a metal footing base embedded in a concrete filled hole. The four tower legs are effectively in parallel and offer an adequate low ground resistance such that additional electrodes are generally not required. This brings us to the main point: the reinforced concrete footings, reinforced concrete grade beams, and other reinforced concrete structures provide, with a little work, an effective, reliable, and cost attractive system grounding vehicle 相似文献