期刊
JOURNAL OF POWER SOURCES
卷 484, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2020.229246
关键词
Lithium-ion batteries; LiCoO2; Cycle; Rest time; Charge; High voltage
资金
- Dell Inc.
- Center for Advanced Life Cycle Engineering (CALCE) at the University of Maryland annually
This paper investigates the impact of rest period after full charge on the capacity degradation behavior of graphite/LiCoO2 pouch batteries, and develops a capacity fade trend model for further understanding of the relationship.
Degradation of lithium-ion batteries is known to be affected by various operational and environmental conditions, including temperature, discharge and charge C-rates, and depth of discharge. Another factor is the open rest period, which occurs in all laptops, smartphones, and electric vehicles that are kept connected to a charger, even after the battery is fully charged. This paper investigates the effects of the rest period after full charge on the capacity degradation behavior of graphite/LiCoO2 pouch batteries under four different ambient temperatures. The interplay between rest time, battery state of charge, and number of cycles is investigated to explain the capacity fade trends. A capacity fade trend model is then developed and applied to the experimental data, and the applicability of rest time as an accelerating stress factor for lithium-ion battery testing is presented.
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