Thermo-electrochemical Activation of an In-Cu Intermetallic Electrode for the Anode in Lithium Secondary Batteries

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Jung, Yoon S.; Lee, Kyu T.; Kim, Jun H.; Kwon, Ji Y.; Oh, Seung M.
Issue Date
Adv. Funct. Mater. 2008, 18, 3010
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 In–Cu binary intermetallic compound (Cu7In3), which shows no activity at room
temperature as a result of activation energy required for In–Cu bond cleavage, can be made active by discharge–charge cycling at
elevated temperatures. Upon lithiation at elevated temperatures (55–120 8C), 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.
1616-301X (print)
1616-3026 (online)
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Chemical and Biological Engineering (화학생물공학부)Journal Papers (저널논문_화학생물공학부)
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