Synthesis and electrochemical properties of Li-excess Li1+ x [Ni0.5Co0.2Mn0.3]O2 cathode materials using ammonia-free chelating agent.

Highlights: [•] Ni0.5Co0.2Mn0.3(OH)2 was prepared via co-precipitation using oxalic acid as chelating agent. [•] The reaction mechanism for the preparation of precursor was also studied. [•] Effect of excess Li on the physical and electrochemical properties of the oxides was investigated. [•] Among the samples, Li1.1(Ni0.5Co0.2Mn0.3)O2 exhibits excellent electrochemical properties. [•] Such enhanced electrochemical performances are related to the improved physical properties. [ABSTRACT FROM AUTHOR]