Journal
JOURNAL OF POWER SOURCES
Volume 215, Issue -, Pages 63-68Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2012.04.090
Keywords
Lithium-ion battery; Cathode; Surface modification; Perovskite
Funding
- National Science Foundation for Young Scholars [11004032]
- Natural Science Foundation of China [11074039]
- National Key Project for Basic Research of China [2011CBA00200]
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La0.7Sr0.3MnO3-coated 5 V spinel LiNi0.5Mn1.5O4 as cathode is prepared by mixing LiNi0.5Mn1.5O4 powders and the sol gel-drived La0.7Sr0.3MnO3 matrix, followed by high-temperature calcinations. The effect of La0.7Sr0.3MnO3-coating on the electrochemical performances of LiNi0.5Mn1.5O4 cells, especially at elevated temperature, is investigated systematically by the charge/discharge testing, cyclic voltammograms and AC impedance spectroscopy, respectively. Compared to pristine LiNi0.5Mn1.5O4, La0.7Sr0.3MnO3-coated material has much lower surface and charge-transfer resistances and shows a higher lithium diffusion rate. The results of electrochemical experiments demonstrate that the modified material exhibits remarkably enhanced electrochemical reversibility and stability at elevated temperature. The La0.7Sr0.3MnO3-coating layer protected the surface of the active materials from HF in the electrolyte during electrochemical cycling. As a result, the electrochemical cycling stability is improved. (C) 2012 Elsevier By. All rights reserved.
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