期刊
JOURNAL OF POWER SOURCES
卷 124, 期 1, 页码 254-260出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0378-7753(03)00729-8
关键词
accelerated power degradation; pulse power characterization test; statistical experimental design
A statistically designed accelerated aging experiment was conducted to investigate the effects of aging time, temperature, and state-of-charge (SOC) on the performance of lithium-ion cells. In this experiment, a number of cells were stored in a variety of static aging environments ranging from 25 degreesC and 60% SOC to 55 degreesC and 100% SOC. The power output of each cell was monitored regularly over the course of 44 weeks via a low current level hybrid pulse power characterization test. A single empirical model of power fade, involving two concurrent degradation processes, was found to be applicable over a wide range of experimental conditions. The first degradation process is relatively rapid (nearly complete within 4 weeks) and is accelerated by temperature with unknown kinetics. The second degradation process (accelerated by temperature and SOC) is less rapid and exhibits time(3/2) kinetics. (C) 2003 Elsevier B.V. All rights reserved.
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