基于容量增量分析的复合材料锂电池分区间循环衰退机理

发布时间：2018-05-13 18:35

  本文选题：三元锰酸复合材料锂电池 + 循环区间　； 参考：《电工技术学报》2017年13期

【摘要】：以35A·h三元锰酸锂复合材料锂电池为研究对象,探索分析锂电池分区间循环衰退机理。基于容量增量曲线峰值分布,将荷电状态(SOC)区间划分为0%~20%、20%~60%、60%~100%及0%~100%四个区间,分别在各区间进行衰退老化实验。为保证电池各循环区间的容量吞吐量一致,以全区间为基准,在40℃下以2C电流共进行600次充放电循环实验。从起始点开始以100个循环为间隔,在室温条件下采用C/20电流进行容量增量分析(ICA)性能测试实验,分析不同SOC区间电池的衰退机理。结果表明:电池在SOC全区间使用时衰退最快,在低端区间使用时衰退较慢;在中低区间的性能衰退主要是由活性锂离子的损失造成的,而在SOC高端区间还包括活性材料的损失和动力学衰退。本文得到的结论为电池的改进设计及使用区间的选取提供了理论依据。
[Abstract]:Taking lithium battery of lithium manganate composite material of 35A h three as the research object, the mechanism of recirculation between zoning lithium batteries is explored and analyzed. Based on the peak distribution of capacity increment curve, the state of charge state (SOC) is divided into four intervals, such as 0%~20%, 20%~60%, 60%~100% and 0%~100%, respectively. The capacity and throughput of the room is consistent, taking the whole interval as the benchmark and taking 600 charge and discharge cycles at the 2C current at 40 C. From the starting point, the capacity increment analysis (ICA) test is carried out with the C/20 current at room temperature, and the decline mechanism of the battery in the different SOC interval is analyzed. The results show that the battery is in the process. The decline of SOC is the fastest when used in the whole area, and the decline is slower in the low end interval; the performance decline in the middle and low interval is mainly caused by the loss of active lithium ion, but the loss of active material and the decline of dynamics are also included in the high end of the SOC. The conclusion of this paper provides the reason for the improvement of the battery design and the selection of the use interval. On the basis.

【作者单位】： 北京交通大学国家能源主动配电网技术研发中心北京电动车辆协同创新中心;国网冀北电力有限公司电力科学研究院;北京新能源汽车股份有限公司;
【基金】：国家电网公司科技项目资助(E15L00190)
【分类号】：TM912
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本文编号：1884329