Journal
MATERIALS CHEMISTRY AND PHYSICS
Volume 93, Issue 1, Pages 6-9Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2005.01.039
Keywords
Li-ion cell; li(1+y)Ni(0.5-x)Al(x)Mn(0.5-x)O(2); sol-gel method; cathode mated
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Layered Li-Ni-Mn-O compounds were successfully synthesized via a new sol-gel method at 950 degrees C in air, in which citric acid as chelating agent makes it possible to intermix cations in atomic scale and, therefore, leads to homogeneous and fine oxide products. Substitution of Al3+ and/or Li+ ion was shown to prevent the structural degradation of the electrode material allowing a higher discharge capacity. Li1+yNi0.5AlxMn0.5-xO2 doped with 5 mol% Al exhibited a discharge capacity of 192 mAh g(-1) at 2.5-4.7 V with 4% capacity loss after 30 cycles. An addition of 8 mol% Li+ showed a smaller voltage drop and improved the capacity retention. (c) 2005 Elsevier B.V. All rights reserved.
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