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A study of the relationship between coulombic efficiency and capacity degradation of commercial lithium-ion batteries

Title
A study of the relationship between coulombic efficiency and capacity degradation of commercial lithium-ion batteries
Author
배석주
Keywords
Lithium-ion battery; Coulombic efficiency; Capacity degradation; Aging mechanism; Incremental capacity
Issue Date
2018-06
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
ENERGY, v. 145, page. 486-495
Abstract
High coulombic efficiency (CE) usually indicates a long battery cycle life. However, the relationship between long-term CE evolution and battery degradation is not fully understood yet. This paper explores the behavior of long-term CE and clarifies its relationship with capacity degradation. Cycle life tests are conducted on two types of mainstream commercial lithium-ion batteries. An incremental capacity (IC) analysis is then employed to identify battery aging mechanisms. Experimental observations along with in-depth discussions are presented regarding battery degradation, aging mechanisms, and CE evolution. From the experimental results, two typical degradation patterns are recognized. From the IC analysis, we observed that, in addition to a loss of lithium inventory, a loss of active material accelerates battery degradation and brings down CE values. From an electrochemical perspective, this paper establishes the relationship between CE evolution and capacity degradation. This relationship can help develop battery degradation models, estimate battery health states, and provide early failure warnings for a battery management system.
URI
https://www.sciencedirect.com/science/article/abs/pii/S0360544217321874?via%3Dihubhttp://repository.hanyang.ac.kr/handle/20.500.11754/118956
ISSN
0360-5442; 1873-6785
DOI
10.1016/j.energy.2017.12.144
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > INDUSTRIAL ENGINEERING(산업공학과) > Articles
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