Electrochemical performance and spectroscopic characterization of TiO2-coated LiNi0.8Co0.2O2 cathode materials

Electrochemical performance and spectroscopic characterization of native and TiO2-coated LiNi0.8Co0.2O2 were investigated. The electrochemical results showed TiO2-coated materials exhibited better cycle stability in the different potential regions (i.e. 3.0–4.3 and 3.0–4.6 V) and the decomposition of the electrolytes was suppressed on coated materials surface. In addition, FT-IR and temperature-programmed desorption–mass spectroscopy (TPD–MS) results demonstrated that different oxidation products were formed on the native and coated electrodes. A possible decomposition mechanism of the electrolytes has been proposed based on our results.