Surface Modification of 0.5Li2MnO3·0.5LiMn0.5Ni0.5O2 with SnO2 Cathode Material for Lithium Ion Batteries

Abstract

Lithium and manganese-rich xLi2MnO3·(1−x)LiMO2 (M=Ni, Co, Mn) composite cathode materials are one of the most investigated cathode materials due to their ability to provide high discharge capacity. However, xLi2MnO3·(1−x)LiMO2cathode materials suffer from high initial irreversible capacity and poor cycling stability. The development of this type composite cathode materials for lithium ion battery is still the challenge for meeting current and future energy storage requirements. The surface modification of the materials is an effective way to overcome those disadvantages according to many work have been reported. In this work, we report that the discharge capacity and cycle performance of 0.5Li2MnO3·0.5LiMn0.5Ni0.5O2 was significantly improved though SnO2 surface modification. The X-ray diffraction study confirms that the material has layered LiMn0.5Ni0.5O2 structure along with the formation of the superlattice ordering of Li2MnO3 without any major change in the crystal structure with SnO2 surface modification. The lower resistance to charge transfer in the SnO2 modified sample is responsible for its better performance.