Hierarchical degradation processes in lithium-ion batteries during ageing

The ageing of lithium-ion battery (LIB) is critical from the application perspective. In this paper, an electrochemical based electrical (ECBE) model is developed to link the model parameters to specific ageing mechanisms. Based on the model parameterization, we report on time resolved degradation p...

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Bibliographic Details
Published in:Electrochimica acta 2017-12, Vol.256, p.52-62
Main Authors: Leng, Feng, Wei, Zhongbao, Tan, Cher Ming, Yazami, Rachid
Format: Article
Language:English
Subjects:
Ageing mechanism
Batteries
Cobalt oxides
Components
Cycle aging
Degradation
Electric contacts
Electrochemistry based electrical model
Electrodes
Electrolytic cells
Graphite
Lithium
Lithium-ion batteries
Lithium-ion battery
Ohmic dissipation
Parameterization
Phase transitions
Rechargeable batteries
Solid electrolytes
Spallation
Storage capacity
Time resolved degradation processes
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Summary:The ageing of lithium-ion battery (LIB) is critical from the application perspective. In this paper, an electrochemical based electrical (ECBE) model is developed to link the model parameters to specific ageing mechanisms. Based on the model parameterization, we report on time resolved degradation processes of LIB during the cycle ageing. The sequence of internal components degradation mechanisms in graphite/lithium cobalt oxide (LCO) coin cells subjected to up to 1000 galvanostatic charge-discharge cycles are revealed. It is found the LIB degradation proceeds according to a series of inter-connected processes, including: i) Solid electrolyte interphase (SEI) formation on the graphite electrode surfaces; ii) LCO phase transformation from active hexagonal to less active spinel phases; iii) Joule heating due to the increased cell resistance resulting in cracking and re-formation of SEI together with surface spallation at the LCO electrode, as well as degradation of the separator; iv) Active Li losses owing to metal plating on the electrodes during overcharge and overdischarge; v) Exfoliation of the graphite anode and the degradation of LCO cathode; and vi) Intergranular contact disconnection within electrodes. These processes contribute to the overall decay in the storage capacity and the LIB terminal voltage differently as shown experimentally.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2017.10.007