Structural and electrochemical characterization of layered 0.3Li2MnO3·0.7LiMn0.35−x/3Ni0.5−x/3Co0.15−x/3CrxO2 cathode synthesized by spray drying

• Cr distributing uniformly in the materials was easily realized by spray drying.
• The 0.3Li2MnO3·0.7LiMn0.35−x/3Ni0.5−x/3Co0.15−x/3CrxO2 material was first reported.
• An appropriate Cr content doping can improves the structural stability.
• An appropriate Cr content doping can enhance the electrochemical performance.
• We hope our work will be helpful for other research groups.

Cr doped 0.3Li2MnO3·0.7LiMn0.35−x/3Ni0.5−x/3Co0.15−x/3CrxO2 (x = 0, 0.02, 0.04, 0.06) as a cathode material for Li-ion battery has been successfully synthesized by spray drying and subsequent calcination. The effects of Cr dopant on the structural and electrochemical properties of this material have been investigated by XRD, SEM, EDS, charge–discharge measurements, Ac impedance spectroscopy as well as cyclic voltammetry. These results demonstrated that the element Cr distributed uniformly in these materials. With the Cr content increasing, lattice parameters a and c decrease and less Li ion locates in transition metal site. Among the synthesized Cr-doped materials, when x = 0.04, this material shows the best electrochemical properties. Between 2.5 and 4.8 V (vs. Li/Li+), the initial discharge capacities of the materials increased from 143 to 168 mA h g−1 at a constant current density of 250 mA g−1. After 50 cycles, the capacity retention of the materials raised from 83% to 93%.

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