Deng C.,Key Laboratory of Photonic and Electronic Bandgap Materials |
Sun Y.H.,Key Laboratory of Photonic and Electronic Bandgap Materials |
Zhang S.,Harbin Engineering University |
Shang Y.,Key Laboratory of Photonic and Electronic Bandgap Materials |
And 2 more authors.
International Journal of Electrochemical Science | Year: 2012
0.5Li2MnO3-0.5LiNi1/4Mn1/4Co1/2O2/C composite is prepared by coprecipitation method followed by sintering with sucrose in the air. The 0.5Li2MnO3-0.5LiNi1/4Mn1/4Co1/2O2/C composite is characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electroscopy (TEM) and electrochemical tests. The effects of carbon coating on the morphology, structure and electrochemical properties of the lithium and manganese-rich materials are investigated. Based on the morphological results, a thin layer of residual carbon is observed on the surface of the 0.5Li2MnO3-0.5LiNi1/4Mn1/4Co1/2O2 particle. Electrochemical and structural results demonstrate that the carbon coating greatly improves the electrochemical property and rate capability of 0.5Li2MnO3-0.5LiNi1/4Mn1/4Co1/2O2 without destroying its crystal structure. The improvements of the carbon coated material can be attributed to its enhanced conductivity and electrochemical kinetic. © 2012 by ESG.