Journal
ELECTROCHIMICA ACTA
Volume 102, Issue -, Pages 416-422Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2013.04.018
Keywords
Lithium nickel manganese oxide; Excess of lithium; Pulsed laser deposition; Cycling performance; Rate capability
Categories
Funding
- National Natural Science Foundation of China [10974062, 11004067]
- National Basic Research Program of China [2010CB923203]
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Lithium secondary batteries using LiNi0.5Mn1.5O4 films as a cathode material were prepared by pulsed laser deposition on stainless steel substrates. X-ray diffraction and Field-emission Scanning Electron Microscope results show that the film deposited at 750 degrees C exhibits good crystallinity with well-defined grains structure. Charge/discharge behavior of the batteries under a high cutoff voltage of 4.9 V vs. Li was highly improved by using Li-rich samples, which exhibits larger specific capacity and higher rate capability. Especially, when the substrate temperature increases to 750 degrees C, the reversible capacity maintains 116.8 mAh g(-1) after 100 cycles at 0.5C, and the Coulombic efficiency is almost a constant value of 98%. It also exhibits excellent rate capability, as the rates increase to 5 and 10C, and about 95.4% and 92.3% of its initial capacity at 0.2C can be retained. (C) 2013 Elsevier Ltd. All rights reserved.
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