A Comparison of Different Ways of Mixing the Lithium Salt on the Electrochemical Properties for Li[Li<sub>0.2</sub>Mn<sub>0.54</sub>Ni<sub>0.13</sub>Co<sub>0.13</sub>]O<sub>2</sub> Materials

Abstract

Li-rich layered cathode materials Li [Li0.2Mn0.54Ni0.13Co0.13]O2 with spherical morphology were synthesized via a co-precipitation method by different ways of mixing the lithium salt. The cathode materials were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM). The results show that Li [Li0.2Mn0.54Ni0.13Co0.13]O2 with a well-ordered layered structure consists of small primary particles ranging from 180 to 370 nm. By comparation, the primary particles of T2 (mixing with Li2CO3 after preheating carbonate precursor) is smaller. Electrochemical measurements have also been employed, including charge-discharge, cyclic voltammetry (CV) and electrochemical impedance spectra (EIS). It is demonstrated that T2 exhibits significant improvements on the electrochemical performance, especially the rate capability. The discharge capacity is 211 mAh g−1 at 1C for T2 electrode, and still maintains an discharge capacity of 158.8mAh g−1 at 4C. It is believed that the remarkably enhanced rate capability might be ascribed to mixing with Li2CO3 after preheating by changing the way of mixing with Li2CO3.