Reactivity of lithium battery electrode materials toward non-aqueous electrolytes: spontaneous reactions at the electrode–electrolyte interface investigated by FTIR

Spontaneous reactions occurring at the surface of LiNi 0.8Co 0.2O 2 and LiMn 2O 4-based electrodes during the storage in organic non-aqueous electrolytes have been investigated by diffuse reflectance FTIR technique. It is found that both materials spontaneously form different inorganic and organic c...

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Bibliographic Details
Published in:Journal of power sources 2001-12, Vol.103 (1), p.10-17
Main Authors: Ostrovskii, D., Ronci, F., Scrosati, B., Jacobsson, P.
Format: Article
Language:English
Subjects:
Applied sciences
Direct energy conversion and energy accumulation
Electrical engineering. Electrical power engineering
Electrical power engineering
Electrochemical conversion: primary and secondary batteries, fuel cells
Exact sciences and technology
Infrared spectroscopy
Insertion cathodes
Interfacial reactions
Lithium batteries
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Summary:Spontaneous reactions occurring at the surface of LiNi 0.8Co 0.2O 2 and LiMn 2O 4-based electrodes during the storage in organic non-aqueous electrolytes have been investigated by diffuse reflectance FTIR technique. It is found that both materials spontaneously form different inorganic and organic compounds on their surface when in contact with electrolyte solutions. The nature of these self-acting reactions is moreover found to be similar to that of the processes occurring during electrochemical cycling of the electrodes. Reaction mechanisms and the final products depend on both electrode surface chemistry and the nature of electrolyte used. It appears that the spontaneous reactions are initiated by lithium deintercalation from the electrode active material. The influence of different factors, e.g. degree of lithiation of the active material, roughness of the electrode surface and temperature on the reaction rate is discussed.
ISSN:0378-7753
1873-2755
DOI:10.1016/S0378-7753(01)00815-1