期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 509, 期 8, 页码 3623-3626出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2010.12.116
关键词
Lithium nickel manganese oxide; Cycling performance; Rate capability; Raman spectroscopy; Cyclic voltammetry
资金
- National Science Foundation of China [20971117, 10979049]
- Education Department of Anhui Province [KJ2009A142]
LiNi0.5Mn1.5O4 spinel samples were synthesized by a two-step solid-state reaction method. Manganese acetate and nickel acetate were mixed together in a molar ratio of 3:1 and reacted at 500 degrees C to form a mixed Ni-Mn oxide, which reacted subsequently with lithium acetate at 900 degrees C to form a LiNi0.5Mn1.5O4 powder. For comparison, manganese acetate, nickel acetate and lithium acetate were mixed together in a molar ratio of 3:1:2 and directly reacted in one-step at 900 degrees C. The LiNi0.5Mn1.5O4 powder synthesized from the two-step process shows enhanced conductivity and improved rate performance. X-ray diffraction and Raman spectroscopy analyses indicate that the two-step sample has a space group of Fd (3) over barm while the one-step sample has a space group of P4(3)32. The cyclic voltammetry test has confirmed that lithium-ion cells with the two-step sample in the positive electrode exhibit lower impedance than those with the one-step sample. (C) 2010 Elsevier B.V. All rights reserved.
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