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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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

Received: 30 November 2015 Published: 19 July 2017

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TM912

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	Articles by authors
	Xue Nan
	Sun Bingxiang
	Bai Kai
	Han Zhiqiang
	Li Na

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Xue Nan,Sun Bingxiang,Bai Kai等. Different State of Charge Range Cycle Degradation Mechanism of Composite Material Lithium-Ion Batteries Based on Incremental Capacity Analysis[J]. Transactions of China Electrotechnical Society, 2017, 32(13): 145-152.

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

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