Hierarchical micro-nanostructured and Al3+-doped Li1.2Ni0.2Mn0.6O2 active materials with enhanced electrochemical properties as cathode materials for Li-ion batteries

摘要

Li1.2Ni0.2Mn0.6-xAl2xO2 (x = 0, 0.01, 0.02, 0.03) electrode materials with hierarchical micro-nanostructures are synthesized via a porous polypropylene (PP) membrane as hard template. The physical and electrochemical measurements of the samples are systematically investigated to reveal the effects of the Al3+-doping on the electrochemical properties and physical characteristics. The test results show that the Li(12)Ni(0.8)Mn(0.58)8Al(0.04)O(2) (x = 0.02) sample delivers the highest specific charge/discharge capacities and an improved rate capabilities for the enhanced the structure stability, reduced the charge transfer resistance and improved the diffusion coefficient of lithium ions. (C) 2019 Acta Materialia Inc Published by Elsevier Ltd. All rights reserved.