锂离子动力电池热老化的路径依赖性研究

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Abstract The performance and degradation of the lithium manganese (LiMn₂O₄, 90A·h) batteries used in pure electric buses are investigated under thermal excursion test from 25℃; through 0℃, 25℃, 40℃ and 60℃; to 25℃. In each isothermal regime, a reference performance test with charge and discharge cycles at C/20, C/3, C/2, 2C/3 and 1C is implemented to quantify battery capacity, rate capability and other performance variations. The reasons of the capacity fade caused by the thermal excursion are loss of active materials, degradation in reaction kinetics and the ohmic resistance increases. Using incremental capacity analysis to infer possible capacity fade processes, the result shows that: capacity fade has begun after the thermal excursion test from 0℃ to 40℃ and exposure to 60℃ leads to irreversible fade. It is attributed to origins including loss of active material and degradation in reaction kinetics. The experimental protocols and results are helpful in assisting the research on path dependence of battery degradation in electric vehicle applications.

Key words： Pure electric bus lithium manganese battery thermal excursion test path dependence degradation mechanisms

Received: 26 August 2013 Published: 05 November 2014

PACS:

TM912

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	Articles by authors
	Ma Zeyu
	Jiang Jiuchun
	Zhang Weige
	Wang Zhanguo
	Zheng Linfeng
	Shi Wei

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Ma Zeyu,Jiang Jiuchun,Zhang Weige等. Research on Path Dependence of Large Format LiMn₂O₄ Battery Degradation in Thermal Aging[J]. Transactions of China Electrotechnical Society, 2014, 29(5): 221-227.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2014/V29/I5/221

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