Low-temperature behavior of graphite–tin composite anodes for Li-ion batteries

The challenge of increasing low-temperature performances of anodes for Li-ion batteries is faced by preparing graphite–tin composite electrodes. The anodes are prepared by mixing partially oxidized graphite with nanometric Sn powder or by coating the oxidized graphite electrode with a thin Sn layer....

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Bibliographic Details
Published in:Journal of power sources 2010-10, Vol.195 (20), p.7090-7097
Main Authors: Nobili, F., Mancini, M., Dsoke, S., Tossici, R., Marassi, R.
Format: Article
Language:English
Subjects:
Anodes
Applied sciences
Batteries
Direct energy conversion and energy accumulation
Electrical engineering. Electrical power engineering
Electrical power engineering
Electrochemical conversion: primary and secondary batteries, fuel cells
Electrochemical impedance spectroscopy
Electrode polarization
Electrodes
Exact sciences and technology
Graphite
Graphite anodes
Intercalation kinetics
Li-ion batteries
Lithium-ion batteries
Materials
Sn composites
Thin films
Tin
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Description
Summary:The challenge of increasing low-temperature performances of anodes for Li-ion batteries is faced by preparing graphite–tin composite electrodes. The anodes are prepared by mixing partially oxidized graphite with nanometric Sn powder or by coating the oxidized graphite electrode with a thin Sn layer. Long-term cycling stability and intercalation/deintercalation performances of the composite anodes in the temperature range 20 °C to −30 °C are evaluated. Kinetics is investigated by cyclic voltammetry and electrochemical impedance spectroscopy, in the attempt to explain the role of Sn in reducing the overall electrode polarization at low temperature. Two possible mechanisms of action for bulk metal powder and surface metal layer are proposed.
ISSN:0378-7753
1873-2755
DOI:10.1016/j.jpowsour.2010.05.001