This work was supported by KOSEF through the Research Centre for Energy Conversion and Storage. Supporting Information is available online from Wiley InterScience or from the author.
Thermo-electrochemical Activation of an In–Cu Intermetallic Electrode for the Anode in Lithium Secondary Batteries†
Article first published online: 22 SEP 2008
Copyright © 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Advanced Functional Materials
Volume 18, Issue 19, pages 3010–3017, October 9, 2008
How to Cite
Jung, Y. S., Lee, K. T., Kim, J. H., Kwon, J. Y. and Oh, S. M. (2008), Thermo-electrochemical Activation of an In–Cu Intermetallic Electrode for the Anode in Lithium Secondary Batteries. Adv. Funct. Mater., 18: 3010–3017. doi: 10.1002/adfm.200701526
- Issue published online: 6 OCT 2008
- Article first published online: 22 SEP 2008
- Manuscript Revised: 9 MAY 2008
- Manuscript Received: 28 DEC 2007
Lithium ion batteries (LIBs) have been emerging as a major power source for portable electronic devices and hybrid electric vehicles (HEV) with their superior performance to other competitors. The performance aspects of energy density and rate capability of LIBs should, however, be further improved for their new applications. Towards this end, many Li-alloy materials, metal oxides, and phosphides have been tested, some of which have, however, been discarded because of poor activity at ambient temperature. Here, it is shown that the InCu binary intermetallic compound (Cu7In3), which shows no activity at room temperature as a result of activation energy required for InCu bond cleavage, can be made active by discharge–charge cycling at elevated temperatures. Upon lithiation at elevated temperatures (55–120 °C), the Cu7In3 phase is converted into nanograins of metallic Cu and a lithiated In phase (Li13In3). The underlying activation mechanism is the formation of new In-rich phase (CuIn). The de-lithiation temperature turns out to be the most important variable that controlling the nature of the In-rich compounds.