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

• Layered composite 0.5Li2MnO3–0.5LiNi0.5Mn0.5O2 (LLNMO) cathode material synthesis by carbonate based co-precipitation method.
• We examine the effect of MgO coated Layered composite 0.5Li2MnO3–0.5LiNi0.5Mn0.5O2 (LLNMO) cathode material.
• X-ray diffraction confirms the layered structure; without any major change in crystal structure with MgO-coated.
• We compare the electrochemical properties of pristine and MgO –coated composite cathode.

Pristine and MgO-coated 0.5Li2MnO3–0.5LiNi0.5Mn0.5O2 (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 Li2MnO3 and LiNi0.5Mn0.5O2, 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 Li2MnO3. However, MgO-coated 0.5Li2MnO3-0.5LiNi0.5Mn0.5O2 composite cathode showed good cyclability and columbic efficiency, where lower surface layer resistance may contribute to better performance with MgO-coated LLNMO.