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1.
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   

2.
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   

3.
锂离子电池正极材料中钴、镍、锰的测定   总被引:5,自引:2,他引:3  
张玲  陈平  张涛  陈金花  阎勇 《电池》2005,35(1):78-79
采用原子吸收分光光度法对锂离子电池正极材料中高含量的钴、镍、锰成分进行测定.探讨了利用原子吸收分光光度计,调整燃烧头角度和采用对应元素的次灵敏线对高含量钴、镍、锰进行测定的条件.结果表明:该方法具有较好的准确度和精密度,回收率为97.7%~105.3.%,相对平均偏差小于0.76%.  相似文献   

4.
高镍无钴正极材料是当前锂离子电池正极材料研究热点之一.从镍酸锂体相掺杂、高镍三元(LiNi1-x-yCoxAlyO2或LiNi1-x-yMnxCoyO2)去Co、高镍三元核壳和单晶结构的基础上去Co多种技术路线出发,综述了高镍无钴正极材料最新研究进展,简要介绍了高镍无钴材料面临的挑战,分析展望了未来高镍无钴正极材料的发展方向和有价值的研究方向.  相似文献   

5.
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  
李焕春  王民贤 《电源技术》2001,25(4):289-290
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   

6.
张玲  陈平  李丹 《电池》2007,37(6):476-477
采用化学分析法对锂离子电池正极材料中的高含量锰进行测定.探讨了在大量干扰元素镍、钴存在下的测定条件.结果表明:该方法准确,精密度高,标准偏差不大于0.070,变异系数小于0.15%,回收率为99.63%~100.50%.  相似文献   

7.
谭静进  吴开洪  张敏  谢明宏 《电池》2012,42(1):50-53
研究了丁二酮肟沉淀分离-乙二胺四乙酸二钠滴定法测定LiCoxNiyMn1-x-yO2(0<x,0<y,x+y<1)中镍含量,得到准确快速测定镍含量的最佳操作条件为:加入30 ml 15%酒石酸溶液、20 ml 50%乙酸铵溶液,沉淀时的pH=6.5、陈化时间为0 min;采用电位滴定法准确快速测定锰;提出以二甲酚橙为指...  相似文献   

8.
采用柠檬酸盐溶胶-凝胶法制备纳米钴、镍铁氧体.采用X射线衍射(XRD)、原子力显微镜(AFM)分析了铁氧体物相组成及微观形貌;用振动样品磁强计测定产物磁滞回线.以苯丙乳液为基相制备铁氧体涂层,用网络分析仪测试了涂层的吸波性能.结果表明,凝胶缓慢升温至850℃处理,得到结晶度良好的尖晶石型纳米钴、镍铁氧体,钴铁氧体平均粒径为36nm,镍铁氧体平均粒径为56nm.在5GHz~12GHz频段内,涂层的微波反射损耗大部分在10dB以上,具有良好的吸波性能.  相似文献   

9.
童庆松  朱群平  庄阳彬  杨勇 《电源技术》2005,29(10):676-679
以盐酸羟胺为还原剂,用乙二胺四乙酸(EDTA)滴定法测定掺钴锂锰氧化物中锰和钴的总量,同时用硝酸铵-硫酸亚铁铵氧化还原法测定掺钴锂锰氧化物中总锰量。两者结合可以计算掺钴锂锰氧化物中锰和钴的组成。测出的锰和钴的含量与理论值接近,其中锰的含量准确率达99%以上。因此,与其它仪器分析方法相比,如与原子吸收光谱法(AAS)相比,该方法简便、可靠,准确度高,是一种较好的测定方法。  相似文献   

10.
蒲薇华  何向明 《电池》2005,35(6):427-429
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   

11.
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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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   

16.
《中国照明》2010,(3):42-45
工程介绍 世博轴及地下综合体工程(简称世博轴)位于浦东世博园核心区。南起耀华路,跨雪野路、南环路、北环路、及浦明路,到滨江世博公园。  相似文献   

17.
Dual-rotor, radial-flux, toroidally wound, permanent-magnet machines   总被引:2,自引:0,他引:2  
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   

20.
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   

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