Synthesis and electrochemical characterization of Li2MnO3–LiNixCOyMnzO2 cathode for lithium battery using co-precipitation method

The LixNi0.23Co0.12Mn0.65O2 electrode system with various compositions (x = 1.19, 1.33, 1.46, 1.58) was synthesized from a metal oxide precursor synthesized by co-precipitation method. The XRD patterns of the prepared powders revealed a hexagonal α-NaFeO2 structure (space group: R-3m, 166) and the existence of a Li2MnO3 phase in the composite structure. In particular, the low Li content sample shows a three integrated structure (spinel, Li2MnO3, LiMO2) for a Li/Metal(Ni/Co/Mn) mol ratio of 1.2. Scanning electron microscopy showed that all the synthesized samples contained spherical agglomerates with a size of 8–10 μm. Among the samples tested, Li1.46Ni0.23Co0.12Mn0.65O2 shows relatively high charge and discharge capacity for the first cycle is 287, 192.9 mA h g−1, respectively. Also, charge transfer resistance was also significantly improved compare with other samples.

1st Charge–discharge curves the (a) x = 1.19, (b) x = 1.33, (c) x = 1.46, and (d) x = 1.58 on x in the LixNi0.23Co0.12Mn0.65O2/Li cell cycled in the voltage range of 2.0–4.6 V at a constant current density of 17 mA g−1..Figure optionsDownload as PowerPoint slideHighlights
► LixNi0.23Co0.12Mn0.65O2 (x = 1.19, 1.33, 1.46, 1.58) electrode system were synthesized by adopting co-precipitation method.
► Li1.46Ni0.23Co0.12Mn0.65O2 shows high charge and discharge capacity is 287, 192.9 mA h g−1, respectively.
► We report electrochemical property related to microstructure and crystallography via Li content.