Cobalt-free Li-Rich 0.1Li2MnO3?0.9LiNi0.56Mn0.44O2 with High Performances as Cathode Material for Lithium-ion Batteries

4th Annual International Workshop on Materials Science and Engineering

Dou, Shumei^1 ; Wei, Fenyan^1 ; Li, Huiqin^1 ; Li, Ping^1

Engineering Research Center of Advanced Ferroelectric Functional Materials, Shaanxi Key Laboratory of Phytochemistry, College of Chemistry and Chemical Engineer, Baoji University of Arts and Sciences, Baoji, Shaanxi

721013, China^1

关键词: Cath-ode materials;    Electrochemical measurements;    Electrochemical performance;    High-temperature calcination;    Initial discharge capacities;    Layered Structures;    Rate capabilities;    Synergistic effect;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/381/1/012180/pdf
DOI  :  10.1088/1757-899X/381/1/012180

来源: IOP

【 摘 要 】

The cobalt-free Li-rich layered oxide 0.1Li2MnO3•0.9LiNi0.56Mn0.44O2 is successfully synthesized by a coprecipition method followed by high-temperature calcinations. The compostions and structures of the material have been investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and the results revealed that the sample possesses typical α-NaFeO2 layered structure with a weak reflection of LiMnO6, and of microspheres with porous surface. Electrochemical measurements showed that the cobalt-free Li-rich sample delivers good cycling stability and rate capability with initial discharge capacity of 263, 173, 137 and 57 mAh g-1 at different current density of 50, 160, 320 and 640 mA g-1, respectively. The electrochemical performances of the cobalt-free Li-rich 0.1Li2MnO3•0.9LiNi0.56Mn0.44O2 could be related to not only the synergistic effect of specific morphology and appropriate size but also the porous surface.