ChemInform Abstract: Synthesis and Electrochemistry of LiNixMn2-xO4.
Abstract
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ChemInform Abstract
Samples of LiNixMn2-xO4 with 0 < x < 0.5 are prepared by solid state reaction of LiOH, Ni(NO3)2×6 H2O, and MnO2 at 750 °C as well as by a sol-gel method using Mn(OAc)2, Ni(NO3)2, and LiOH as precursors and carbon black as stabilizer (250-800 °C), The electrochemical behavior of the samples is studied in Li/LiNixMn2-xO4 coin-type cells. The potential vs. capacity curves show a plateau at 4. 1 V for the Li/LiMn2O4 cells. With increasing x, the length of this plateau decreases and a new plateau at 4.7 V appears. The shift of the plateau potential is caused by the higher binding energy (by 0.6 eV) of the Ni eg electrons compared to the Mn eg electrons. LiNi0.5Mn1.5O4 prepared by the sol-gel technique at a firing temp. of ≈600 . degree.C exhibits a capacity of > 100 mAh/g at 4.7 V which is maintained over tens of cycles.
