S-Space College of Engineering/Engineering Practice School (공과대학/대학원) Dept. of Chemical and Biological Engineering (화학생물공학부) Journal Papers (저널논문_화학생물공학부)
Role of Electrochemically Driven Cu Nanograins in CuGa2 Electrode
- Lee, Kyu T.; Jung, Yoon S.; Kwon, Ji Y.; Kim, Jun H.; Oh, Seung M.
- Issue Date
- American Chemical Society
- Chem. Mater. 2008, 20, 447
- Upon lithiation, the active (Ga) and inactive component (Cu) in a binary intermetallic CuGa2 electrode
are converted to nanograins (<50 nm) of LixGa and metallic Cu, respectively. It was found that the Cu
nanograins are not idling as an inactive ingredient but have a strong influence on the thermodynamic and
kinetic properties of LixGa phases through a partial bonding to Ga atoms of LixGa (CufGa-Li). The
LixGa phase diagram is altered by the presence of Cu nanograins, eloquently demonstrating that the
surface energy becomes more important than internal energy in controlling thermodynamics of nanosized
materials. The lithiation rate is slower than that for pure Ga electrode because of activation energy needed
for bond cleavage of the partial bonding. The delithiation rate capability is, however, exceptionally good;
the capacity at 26 C amounts to 91% of that at 0.13 C, which is indebted to a weakening in the Ga-Li
bond by the CufGa partial bonding.
- 0897-4756 (print)
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