The role of in situ generated nano-sized metal particles on the coulombic efficiency of MGeO3 (M = Cu, Fe, and Co) electrodes

摘要: Abstract To improve the coulombic efficiency of GeO2 electrode, a Cu-containing ternary metal oxide (CuGeO3) was prepared and electrochemical behavior Cu component studied. The electrode shows low in first cycle (43%), which is mainly caused by poor Ge oxidation kinetics (Ge + 2Li2O → GeO2 + 2Li+ + 2e−). X-ray absorption spectroscopy (XAS) data illustrate that CuGeO3 converted to nano-sized metallic earlier stage lithiation but idles thereafter. In contrast, behaves like electrode. It conversion reaction further lithiated alloying reaction. de-lithiation proceeds reverse order. much improved (74%) cycle, indebted facilitated with reduced polarization. This feature has been explained favorable roles provided situ generated particles make such an intimate contact Li2O they can catalyze decomposition provide electronic conductive network for oxidation. A similar effect observed other oxides (FeGeO3 CoGeO3), wherein formation Fe Co be assumed.