التفاصيل البيبلوغرافية
| العنوان: |
Role of Electrochemically Driven Cu Nanograins in CuGa2Electrode. |
| المؤلفون: |
Kyu T. Lee, Yoon S. Jung, Ji Y. Kwon, Jun H. Kim, Seung M. Oh |
| المصدر: |
Chemistry of Materials. Jan2008, Vol. 20 Issue 2, p447-453. 7p. |
| مصطلحات موضوعية: |
*GIBBS' free energy, *PHYSICAL metallurgy, *SURFACE energy, *HEAT engines |
| مستخلص: |
Upon lithiation, the active (Ga) and inactive component (Cu) in a binary intermetallic CuGa 2electrode are converted to nanograins (<50 nm) of Li xGa 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 Li xGa phases through a partial bonding to Ga atoms of Li xGa (Cu→Ga−Li). The Li xGa 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 Camounts to 91% of that at 0.13 C, which is indebted to a weakening in the Ga−Li bond by the Cu→Ga partial bonding. [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
Academic Search Index |
