Effects of overdischarge on performance and thermal stability of a Li-ion cell

被引:238
作者
Maleki, Hossein [1 ]
Howard, Jason N. [1 ]
机构
[1] Motorola Mobile Devices, Lawrenceville, GA 30043 USA
关键词
lithium-ion cells; overdischarge; overcharge; thermal stability and impedance;
D O I
10.1016/j.jpowsour.2006.03.043
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Overdischarge effects on cycle-life and thermal stability of a commercially available Li-ion cell (rated at 780 mA h) were investigated. Cells were overdischarged and kept at 2.0, 1.5, 1.0, 0.5 or 0.0 V for 72 h (3 days) and then cycled five times (discharge to 3.0 V at 0.4 A and charged to 4.2 V at 0.8 A). This process was repeated five times. The cells overdischarged between 2.0 and 0.5 V experienced irreversible capacity losses of 2-16%. The same cells lost between 8 and 26% more capacity after they were cycled 100 times between 42 and 3.0 V at 0.8 A. Behavior of the cells overdischarged to 0.0 V was unpredictable. Some cells lost nearly 65% of their initial capacities after 15 days of being kept at 0.0 V, and others failed in different stages of overdischarging to 0.0 V. Overdischarging to 0.5 V had minimal effects on thermal stability, overcharge performance and a.c. impedance, but led to considerable swelling of the cells. Overdischarge to 0.0 V caused cell thickness and a.c. impedance to increase by similar to 70 and 250% of their initial values, respectively. This article addresses concerns that overdischarging of Li-ion cells below 1.5 V may cause capacity losses and/or thermal stability changes which could impact tolerance to abuse conditions. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码:1395 / 1402
页数:8
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