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

doi:10.19595/j.cnki.1000-6753.tces.151937

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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。

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	薛楠
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关键词 ：三元锰酸复合材料锂电池, 循环区间, 衰退机理, 容量增量分析法

Abstract：In this paper, the different state of charge range cycle degradation mechanism of composite material lithium-ion batteries (LiMn_1/3Ni_1/3Co_1/3O₂+LiMn₂O₄, 35A·h) is presented. According to the distribution of incremental capacity (IC) curve peak, The SOC range was divided falls according to the distribution of incremental capacity (IC) curve peak into four areas, i.e. 0%~20%, 20%~60%, 60%~100%, and 0%~100%. Cycle degradation experiments were carried on batteries in different each SOC ranges. In order to ensure the consistent throughput of each cycle range, 600 experiments on charging and discharging cycles were conducted at 40℃ with 2C on the basis of total range. The incremental capacity analysis (ICA) performance test was performed at room temperature with C/20 from the starting point for 100-cycle interval. Thereafter the degradation mechanisms of batteries in different SOC ranges were analyzed. The results show that the fastest recession is found in the SOC total range during charging or discharging, and low SOC range declines slowly. The performance degradation between low and medium range is mainly caused by active lithium-ion loss, and high SOC range also includes loss of the active materials and kinetic hindrance. The conclusions can provide theoretical basis for improvements of the battery design and selection of the using range of batteries.

Key words： LiMn_1/3Ni_1/3Co_1/3O₂+LiMn₂O₄ cycle interval degradation mechanism incremental capacity analysis

收稿日期: 2015-11-30 出版日期: 2017-07-19

PACS:

TM912

基金资助:国家电网公司科技项目资助（E15L00190）

通讯作者: 薛楠女,1990年生,硕士研究生,研究方向为动力电池成组应用技术。E-mail: 14121488@bjtu.edu.cn（通信作者）

作者简介: 孙丙香女,1979年生,博士,副教授,研究方向为动力电池成组应用技术。E-mail: bxsun@bjtu.edu.cn

引用本文:

薛楠, 孙丙香, 白恺, 韩智强, 李娜. 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[J]. 电工技术学报, 2017, 32(13): 145-152. Xue Nan, Sun Bingxiang, Bai Kai, Han Zhiqiang, Li Na. Different State of Charge Range Cycle Degradation Mechanism of Composite Material Lithium-Ion Batteries Based on Incremental Capacity Analysis. Transactions of China Electrotechnical Society, 2017, 32(13): 145-152.

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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.151937 https://dgjsxb.ces-transaction.com/CN/Y2017/V32/I13/145

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