Journal
ELECTROCHIMICA ACTA
Volume 212, Issue -, Pages 791-799Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2016.07.025
Keywords
Lithium-ion batteries; High voltage spinel cathode material; Surface modification; Cyclic stability; Rate capability
Categories
Funding
- National Natural Science Foundation of China [51272221]
- Scientific and Technical Achievement Transformation Fund of Hunan Province [2012CK1006]
- Key Project of Strategic New Industry of Hunan Province [2013GK4068]
- Science and Technology plan Foundation of Hunan Province [2013FJ4062]
Ask authors/readers for more resources
The spherical LiNi0.5Mn1.5O4 cathode material synthesized by a co-precipitation method has been modified by Fe2O3 through a simple chemical precipitation method. The effects of Fe2O3 coating on the structure and property of LiNi0.5Mn1.5O4 cathode have been carefully investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDX) and atomic absorption spectroscopy (AAS). The results show that the Fe2O3 coating layer covered the surfaces of the spherical LiNi0.5Mn1.5O4 particles does not change the crystallographic structure of LiNi0.5Mn1.5O4, but it can protect the surface of the active materials from electrolyte erosion and suppresses the dissolution of transition metal elements. The effects of Fe2O3 coating layer on the electrochemical performances of LiNi0.5Mn1.5O4 have also been investigated systematically by the charge-discharge testing and AC impedance spectroscopy. Compared with the pristine LiNi0.5Mn1.5O4, the Fe2O3 modified material exhibits remarkably enhanced cyclic stability and excellent rate capability. In addition, surface modification of the LiNi0.5Mn1.5O4 is found to be an effective route for suppressing the increase of the impedance during the storage process at elevated temperatures. (C) 2016 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available