Anomalously Faster Deterioration of LiNi0.8Co0.15Al0.05O2Graphite High-Energy 18650 Cells at 1.5 C than 2.0 C
Joint Authors
Cui, Dawei
Wang, Jinlong
Sun, Ailing
Song, Hongmei
Wei, Wenqing
Source
Issue
Vol. 2018, Issue 2018 (31 Dec. 2018), pp.1-7, 7 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2018-07-31
Country of Publication
Egypt
No. of Pages
7
Main Subjects
Information Technology and Computer Science
Abstract EN
Discharge rate is a key parameter affecting the cycle life of lithium-ion batteries (LIB).
Normally, lithium-ion batteries deteriorate more severely at a higher discharge rate.
In this paper, we report that the cycle performance of LiNi0.8Co0.15Al0.05O2/graphite high-energy 2.8 Ah 18650 cells is abnormally worse at a 1.5 C discharge rate than at a 2.0 C discharge rate.
Combining macromethods with micromethods, the capacity/rate performance, electrochemical impedance spectroscopy (EIS), and scanning electron microscope (SEM) morphology of the electrodes are systematically investigated.
We have found that the impedance of the negative electrodes after 2.0 C aged is smaller than that after 1.5 C aged, through EIS analysis, and the discharge rate performance of the negative electrodes after 2.0 C aged is better than that after 1.5 C aged through coin cell analysis.
In addition, some special microcracks in the negative electrodes of aged cells are observed through SEM analysis, which can accelerate the side reaction between active and electrolyte and form the thicker SEI which will hinder the Li+ insertion and cause resistance increase.
In short, the LiNi0.8Co0.15Al0.05O2/graphite-based lithium-ion batteries show better cycle life at a 2.0 C discharge rate than at a 1.5 C discharge rate which indicates that the negative electrodes contribute more than the positive electrodes.
American Psychological Association (APA)
Cui, Dawei& Wang, Jinlong& Sun, Ailing& Song, Hongmei& Wei, Wenqing. 2018. Anomalously Faster Deterioration of LiNi0.8Co0.15Al0.05O2Graphite High-Energy 18650 Cells at 1.5 C than 2.0 C. Scanning،Vol. 2018, no. 2018, pp.1-7.
https://search.emarefa.net/detail/BIM-1212886
Modern Language Association (MLA)
Cui, Dawei…[et al.]. Anomalously Faster Deterioration of LiNi0.8Co0.15Al0.05O2Graphite High-Energy 18650 Cells at 1.5 C than 2.0 C. Scanning No. 2018 (2018), pp.1-7.
https://search.emarefa.net/detail/BIM-1212886
American Medical Association (AMA)
Cui, Dawei& Wang, Jinlong& Sun, Ailing& Song, Hongmei& Wei, Wenqing. Anomalously Faster Deterioration of LiNi0.8Co0.15Al0.05O2Graphite High-Energy 18650 Cells at 1.5 C than 2.0 C. Scanning. 2018. Vol. 2018, no. 2018, pp.1-7.
https://search.emarefa.net/detail/BIM-1212886
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1212886