High power and capacity of LiNi0.5Mn1.5O4 thin films cathodes prepared by pulsed laser deposition

• DOI: 10.1016/j.electacta.2013.04.018
• Publication Date: 2013-04-17T17:55:34Z
• Authors: Yan Wang; Guang Yang; Ze Yang; Lichao Zhang; Ming Fu; Hua Long; Zhihua Li; Yunhui Huang; Peixiang Lu
• Keywords: Pulsed Laser Deposition; Field emission microscopy; Deposition

Abstract Lithium secondary batteries using LiNi 0.5 Mn 1.5 O 4 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 °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 °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.