Synthesis and characterization of high-performance RGO-modified LiNi0.5Mn1.5O4 nanorods as a high power density cathode material for Li-ion batteries

• Published in: Ionics 2019-01, Vol.25 (1), p.99-109
• Main Authors: Chen, Qiang, Liu, Haiping, Hao, Jingmin, Bi, Sifu, Gao, Chao, Chen, Lu
• Format: Article
• Language: English
• Subjects: Cathodes; Chemical reactions; Chemistry; Chemistry and Materials Science; Composite materials; Condensed Matter Physics; Electrochemistry; Electrode materials; Emission analysis; Energy Storage; Field emission microscopy; Graphene; Lithium; Lithium-ion batteries; Nanorods; Optical and Electronic Materials; Original Paper; Raman spectroscopy; Rechargeable batteries; Renewable and Green Energy; X-ray diffraction
• ISSN: 0947-7047; 1862-0760
• DOI: 10.1007/s11581-018-2574-7

Micronanosized LiNi 0.5 Mn 1.5 O 4 nanorods coated with reduced graphene oxide is successfully synthesized by a hydrothermal-assembly method. The as-prepared samples are characterized by X-ray diffraction, Raman spectroscopy, field emission scanning electron microscope, and electrochemical tests. The XRD and Raman results show that the LiNi 0.5 Mn 1.5 O 4 nanorods have disordered structure of Fd-3m space group. The SEM characterization exhibits that LiNi 0.5 Mn 1.5 O 4 nanorods are about 200–400 nm in diameter, and the RGO is well dispersed on the surface of LiNi 0.5 Mn 1.5 O 4 nanorods. Moreover, a RGO layer coated on the surface of LiNi 0.5 Mn 1.5 O 4 can suppress the interfacial side reactions. The electrochemical tests show that the RGO-LNMO composites reveal high specific capacity and excellent cyclic stability at high rates. The 1%-RGO-LNMO composite can still possess the capacity of 71.4 mAh g −1 and excellent capacity retention about 99% after 1000 cycles at 10 C rate. The excellent performance of RGO-LNMO composites makes it a promising candidate as lithium-ion battery cathode materials.