Characteristics of surface films formed at a mesocarbon microbead electrode in a Li-ion battery

An investigation is made on the interfacial phenomena of commercially available mesocarbon microbeads (MCMB) as the carbon lithium electrode in an electrolyte, which consists of 1 M LiPF 6 dissolved in an equal mixture of ethylene carbonate (EC) and diethyl carbonate (DEC). Once the charge–discharge...

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Bibliographic Details
Published in:Journal of power sources 2000-12, Vol.91 (2), p.172-176
Main Authors: Kim, J.-S, Park, Y.-T
Format: Article
Language:English
Subjects:
Applied sciences
Carbon electrode
Direct energy conversion and energy accumulation
Electrical engineering. Electrical power engineering
Electrical power engineering
Electrochemical conversion: primary and secondary batteries, fuel cells
Electrochemical properties
Exact sciences and technology
Lithium-ion battery
Mesocarbon microbeads
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Summary:An investigation is made on the interfacial phenomena of commercially available mesocarbon microbeads (MCMB) as the carbon lithium electrode in an electrolyte, which consists of 1 M LiPF 6 dissolved in an equal mixture of ethylene carbonate (EC) and diethyl carbonate (DEC). Once the charge–discharge of lithium (Li) proceeds, a surface film is formed on the MCMB carbon electrode, and its thickness increases with cycle number. The growth of the surface film with cycle number is observed by a scanning electron microscope and the surface resistance by means of AC impedance measurements. A continuous decrease in the charge capacity with cycle number is found and is related to film growth. The surface films are composed of solvated Li compounds, as shown by surface-sensitive Fourier transform infrared (FT-IR) spectroscopy.
ISSN:0378-7753
1873-2755
DOI:10.1016/S0378-7753(00)00465-1