High performance composites of spinel LiMn 2 O 4 /3DG for lithium ion batteries

• Published in: RSC advances Vol. 8; no. 2; pp. 877 - 884
• Main Authors: Luo, X D, Yin, Y Z, Yuan, M, Zeng, W, Lin, G, Huang, B, Li, Y W, Xiao, S H
• Format: Journal Article
• Language: English
• Published: England 02.01.2018
• ISSN: 2046-2069; 2046-2069
• DOI: 10.1039/C7RA12613A

A highly crystalline nanosized spinel LiMn O /3DG composite cathode material for high rate lithium ion batteries was successfully prepared by mixing spinel LiMn O particles with reduced graphene oxide (3DG). Spinel LiMn O and reduced three-dimensional graphene oxide were synthesized using a hydrothermal method and freeze-drying technology, respectively. The structure, morphology and electrochemical performance of the synthesized materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and galvanostatic charge-discharge techniques. The results showed that the LiMn O /3DG composites exhibited excellent rate capability and stable cycling performance. The discharge capacity was 131 mA h g and the capacity remains at 89.3% after 100 cycles at a 0.5 C rate, while the discharge capacity was 90 mA h g at 10 C. Compared with spinel LiMn O materials, the LiMn O /3DG composites showed obvious improvement in electrochemical performance.