The formation and stability of the solid electrolyte interface on the graphite anode

The solid electrolyte interface (SEI) layer plays a critical role in the cycle life of Li-ion batteries. The potential difference across the SEI during charging results in the potential for Li+ intercalation at the graphite-SEI interface to be lower than the potential at the SEI-electrolyte interfac...

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Bibliographic Details
Published in:Journal of power sources 2014-12, Vol.268, p.153-162
Main Authors: Agubra, Victor A., Fergus, Jeffrey W.
Format: Article
Language:English
Subjects:
Applied sciences
Direct energy conversion and energy accumulation
Electric batteries
Electrical engineering. Electrical power engineering
Electrical power engineering
Electrochemical conversion: primary and secondary batteries, fuel cells
Electrolyte decomposition
Electrolytes
Exact sciences and technology
Formations
Graphical user interface
Graphite
Graphite anode
Lithium batteries
Lithium ion batteries
Materials
Solid electrolyte interphase
Solid electrolytes
Stability
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Summary:The solid electrolyte interface (SEI) layer plays a critical role in the cycle life of Li-ion batteries. The potential difference across the SEI during charging results in the potential for Li+ intercalation at the graphite-SEI interface to be lower than the potential at the SEI-electrolyte interface, which can prevent electrolyte reduction and decomposition. The stability of the SEI layer at certain critical battery operating conditions remains a challenge in the performance of lithium ion batteries. Electrolyte additives and surface modification of the anode electrode have been shown to improve the formation of an effective SEI layer. However, there is still a need for improving the robustness of the SEI to withstand extreme battery operating conditions. In this paper, the formation and stability of the SEI layer for lithium ion batteries is reviewed. This review includes discussion of the formation, growth and stability of the SEI on graphite anode materials. •The stability of the SEI layer remains a challenge in batteries performance.•Carbonaceous anode electrode by far forms the most stable SEI layer.•The development of solvent additives and carbon surface modifications is on-going.•More research efforts in the area of improving SEI stability are still needed.
ISSN:0378-7753
1873-2755
DOI:10.1016/j.jpowsour.2014.06.024