High performance composites of spinel LiMn2O4/3DG 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: Cambridge Royal Society of Chemistry 01-01-2018; The Royal Society of Chemistry
• Subjects: Chemistry; Discharge; Electrochemical analysis; Electrochemical impedance spectroscopy; Electrode materials; Electron microscopy; Graphene; Hydrothermal crystal growth; Lithium; Lithium-ion batteries; Spinel; Synthesis; X-ray diffraction
• ISSN: 2046-2069; 2046-2069
• DOI: 10.1039/c7ra12613a

A highly crystalline nanosized spinel LiMn
2
O
4
/3DG composite cathode material for high rate lithium ion batteries was successfully prepared by mixing spinel LiMn
2
O
4
particles with reduced graphene oxide (3DG). Spinel LiMn
2
O
4
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
2
O
4
/3DG composites exhibited excellent rate capability and stable cycling performance. The discharge capacity was 131 mA h g
−1
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
−1
at 10 C. Compared with spinel LiMn
2
O
4
materials, the LiMn
2
O
4
/3DG composites showed obvious improvement in electrochemical performance.
3DG/LiMn
2
O
4
composites exhibit a high specific capacity and excellent rate performance.