Enhanced high power and long life performance of spinel LiMn2O4 with Li2MnO3 coating for lithium-ion batteries

Abstract

Li2MnO3 coated spinel lithium manganese oxide (LiMn2O4) materials have been successfully synthesized by a sol-gel method. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) results demonstrate that Li2MnO3 is uniformly coated on the surface of LiMn2O4. Compared with the pristine sample, 3 wt% Li2MnO3-coated sample demonstrates an excellent cycle performance with a capacity retention of 94.17 % after 500 cycles at 25 °C and 89.75 % after 200 cycles at 55 °C. Furthermore, the composite material exhibits an excellent rate performance with a capacity of 97.6 mAh g−1 at 12 C, which can be mainly attributed to the stable phase interface between Li2MnO3 coating layer and host LiMn2O4 material. Therefore, the functionalized Li2MnO3 coating is an effective way to enhance the electrochemical performance of LiMn2O4.