Electrochemical properties of MgO-coated 0.5Li2MnO3-0.5LiNi0.5Mn0.5O2 composite cathode material for lithium ion battery

Abstract Pristine and MgO-coated 0.5Li 2 MnO 3 –0.5LiNi 0.5 Mn 0.5 O 2 (LLNMO) composites were synthesized by carbonate based co-precipitation method for cathode material in Li-ion battery. X-ray diffraction confirmed the layered structure of pure material and no major change in crystal structure with MgO-coating. Raman spectroscopy revealed ionic arrangement corresponding to space group of C2/m and R-3m for Li 2 MnO 3 and LiNi 0.5 Mn 0.5 O 2 , respectively. Scanning electron microscopy shows the primary particle size to be less than 0.5 μm. The observed increase in charge/discharge capacity with number of cycles can be attributed to more activation of Li 2 MnO 3 . However, MgO-coated 0.5Li 2 MnO 3 -0.5LiNi 0.5 Mn 0.5 O 2 composite cathode showed good cyclability and columbic efficiency, where lower surface layer resistance may contribute to better performance with MgO-coated LLNMO.