关键词： MC9S12   储能   电池管理系统   CAN通信  

摘要： 结合储能电池的特点,设计了一套基于PC104和飞思卡尔MC9S12单片机的电池管理系统。提出了电池管理系统整体设计方案,给出了具体的硬件设计和软件设计。实现对电池电压、电流和温度的监控,CAN总线和RS232串口通信的设计和电池荷电状态(SOC)的估计。

关键词： 磷酸铁锂   磷酸二氢铵   氧化铁红   固相烧结法   草酸亚铁   挥发量   碳酸锂  

摘要： 一、磷酸铁锂工艺概述1、固相烧结法A．氧化铁红＋磷酸二氢锂：氧化铁红研磨至纳米级比较困难B．草酸亚铁＋磷酸二氢铵＋碳酸锂：挥发量大。

关键词： 水系锂离子电池   磷酸铁锂   电解液   稳定性  

摘要： 近年来,水系锂离子电池具有功率高、环境污染小等优点而受到广泛关注。文章采用在碱性体系中稳定性较好的Li Fe PO4作为正极材料,石墨板为负极,组装锌锂离子电池;通过SEM分析、XRD分析、循环伏安测试、线性扫描伏安测试等手段研究了锂的嵌入脱出以及锌的沉积溶解反应的反应活性及正极材料的稳定性。

关键词： lithium iron phosphate   Li-ion batteries   PEDOT:PSS   C-rate capability   capacity  

摘要： Environmentally friendly and inexpensive olivine-type compound LiFePO4 is one of the most promising cathode materials for lithium-ion batteries. Its poor electrical conductivity, however, requires introduction of large amounts of conductive carbon additives into LiFePO4 - based cathode materials. The total content of conductive carbon additives and inactive polymeric binders reaches up to 15-20 wt.% of the mass of the electrode material. Therefore, one of the ways to increase electrode capacity is to reduce the amount of inactive components, in particular, by replacing them with conducting polymer. Here, we propose a new LiFePO4 - based electrode composition comprising very high content (99.5 wt.%) of electroactive carbon-coated LiFePO4 and a small amount (0.5 wt.%) of conducting polymer poly-3,4-ethylenedioxythiophene doped with polystyrene sulfonate (PEDOT:PSS), serving as a binder and conducting additive. Gravimetric energy density of these composite electrodes (147 mAhg(-1) at 0.2 C) is 15% higher than of conventional LiFePO4 - based electrodes, while the cyclability and C-rate capability remains virtually at the same level.

关键词： Lithium iron phosphate   Template method   Lithium-ion battery   Cathode material  

摘要： LiFePO4/C composites are synthesized using a simple and inexpensive filtration method. Organic filter templates composed of porous polycarbonate, mixed-cellulose, and cellulose are used as sacrificial hard templates. The LiFePO4/C composites are prepared by infiltrating LiFePO4 precursor solutions into the organic filter templates. Once the organic filter templates are removed by calcination, the LiFePO4 featured meso/macroporous and nanowire structures with residual carbon. All samples are characterized using XRD, SEM/EDS, TEM, EA, BET surface area, CV, EIS, and charge-discharge tests. The characterization data reveal that the organic filter templates provide a specific pore structure that can lead to an increase in the conductivity of LiFePO4. The best performing LiFePO4/C prepared from cellulose (C-700) provides a uniform particle size of 100-150 nm. The particle sizes uniformity can be ascribed to the effect of the structure of 3D fibers in the cellulose on dispersing the LiFePO4 particles and reducing particle aggregations. LiFePO4/C prepared from cellulose thus has a higher discharge capacity and improved rate capability, with 157 mAh g(-1) at 0.1C and 112 mAh g(-1) at 10C. We demonstrate that the LiFePO4/C composites from appropriate organic filter templates can provide excellent electrochemical performance.

关键词： Oxidation-reduction reaction   Electronic structure   Lithium compounds   Lithium cells   Intercalation reactions  

摘要： The main goals of this paper are to investigate the accuracy of the Tran-Blaha modified Becke Johnson (TB-mBJ) potential to predict the electronic structure of lithium iron phosphate and the related redox reaction energy with the lithium deintercalation process. The computed electronic structures show that the TB-mBJ method is able to partially localize Fe-3d electrons in LiFePO4 and FePO4 which usually is a problem for the generalized gradient approximation (GGA) due to the self interaction error. The energy band gap is also improved by the TB-mBJ calculations in comparison with the GGA results. It turned out, however, that the redox reaction energy evaluated by the TB-mBJ technique is not in good agreement with the measured one. It is speculated that this disagreement in the computed redox energy and the experimental value is due to the lack of a formal expression to evaluate the exchange and correlation energy. Therefore, the TB-mBJ is an efficient method to improve the prediction of the electronic structures coming form the standard GGA functional in LiFePO4 and FePO4. However, it does not appear to have the same efficiency for evaluating the redox reaction energies for the investigated system. (C) 2015 AIP Publishing LLC.

关键词： 车底盘   态势分析   车辆生产企业   中联   动力电池   吸尘车   作业车   磷酸铁锂电池   商用车   车辆类型  

摘要： 介绍了新能源环卫车发展现状,对纯电动环卫车现有公告车型数据进行了分析,并对纯电动环卫车底盘的动力电池、驱动电机等关键零部件进行了对比分析,提出了纯电动环卫车关键零部件使用要求和发展趋势。可为纯电动底盘企业、环卫车生产企业以及环卫车采购单位提供参考。

关键词： 磷酸铁锂   有机醇   颗粒分散   容量提高  

摘要： 研究了几种可溶性有机醇添加剂对水热合成LiFePO4材料的电化学性能的影响。恒流充放电结果表明添加乙醇、异丙醇和1,2-丙二醇都可以得到容量较高的LiFePO4材料(>140mAh/g),特别是添加1,2-丙二醇后容量可以达到150mAh/g以上。对比基于Whittingham等报道的传统水热制备方法,即先混合H3PO4和FeSO4溶液再添加LiOH溶液,LiFePO4材料的容量有较大程度的提高。XRD结果表明添加上述3种有机醇都可以得到结晶良好的LiFePO4材料,其晶胞参数与文献报道一致。FE-SEM形貌分析结果表明,添加不同有机醇得到的LiFePO4材料颗粒大小接近,大部分在200nm左右。但是添加乙醇得到的LiFePO4材料颗粒团聚较严重,添加异丙醇和1,2-丙二醇后,团聚程度下降,特别是添加1,2-丙二醇得到的LiFePO4材料颗粒分散较好。由此认为控制和提高颗粒分散程度有利于得到容量较高的LiFePO4材料。大电流放电结果表明,添加1,2-丙二醇得到的LiFePO4材料高倍率放电性能较好,这也是由于颗粒分散程度提高的结果。

关键词： 温度   荷电状态   时间   存储性能  

摘要： 对铝壳9Ah圆柱动力锂离子电池进行存储性能测试,考察了温度、SOC(荷电状态)、时间等因素对磷酸铁锂动力电池存储性能的影响。结果表明,随着存储时间的延长,电池的性能都发生了不同程度的衰减;温度越高对电池的容量衰减影响越大,但对电池功率能力的影响较小;不同SOC对电池的存储影响各不相同,0%和100%SOC均不是最有利于电池性能发挥的最佳荷电状态,综合各种因素,常温下50%SOC为最佳。

关键词： 电池材料   密歇根州   工厂   系统   出售   磷酸铁锂   锂离子电池   阴极材料  

摘要： 密歇根州利沃尼亚的A123系统公司，它是一家先进的磷酸锂离子电池和系统的制造商，完成了向英国一家专门的化学品制造商Johnson Mattey公司出售它的生产电池材料工厂。这家工厂位于中国常州，主要生产磷酸铁锂（LFP）。A123公司过去在它的产品中一直使用这种阴极材料。