Journal
ELECTROCHEMISTRY COMMUNICATIONS
Volume 54, Issue -, Pages 51-54Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.elecom.2015.03.002
Keywords
Na-ion batteries; Negative electrode; Hard carbon; Temperature; Electrolyte; Coating
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Funding
- Ministerio de Ciencia e Innovacion [MAT2011-24757]
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Electrochemical perforrnance of hard carbon (HC) prepared from sugar pyrolysis was investigated against sodium anodes at temperatures ranging from -15 degrees C up to 75 degrees C. Carbon coating was performed on HC decreasing its surface area and allowing significant improvement in terms of the first cycle coulombic efficiency and thus, irreversible capacity loss. Electrochemical performances of HC at various temperatures pointed at the IR drop of the cell being determinant for achieving the highest reversible capacity (450 mAh/g at C/10, 75 degrees C) and rate capability (340 mAh/g at 2C, 75 degrees C) ever reported. Stable cycling was also achieved at -15 degrees C with reversible capacity of ca. 265 mAh/g. (C) 2015 Elsevier B.V. All rights reserved.
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