Synthesis and electrochemical properties of layered LiNi1/2Mn1/2O2prepared by coprecipitation

Sun, Y.-K.; Bae, Y.C.; Myung, S.-T.
February 2005
Journal of Applied Electrochemistry;Feb2005, Vol. 35 Issue 2, p151
Academic Journal
Spherical LiNi1/2Mn1/2O2 powders were synthesized from LiOH . H2O and coprecipitated metal hydroxide, (Ni1/2Mn1/2)(OH)2. The average particle size of the powders was about 10µm and the size distribution was quite narrow due to the homogeneity of the metal hydroxide, (Ni1/2Mn1/2)(OH)2. The tap-density of the LiNi1/2Mn1/2O2 powders was approximately 2.2 g cm-3, which is comparable to the tap-density of commercial LiCoO2. The LiNi1/2Mn1/2 O2electrode delivered a discharge capacity of 152, 163, 183, and 189 mA h g-1 in the voltage ranges of 2.8-4.3, 2.8-4.4, 2.8-4.5, and 2.8-4.6 V, respectively, with good cyclability. Furthermore, Al(OH)3-coated LiNi1/2Mn1/2O2exhibited excellent cycling behavior and rate capability compared to the pristine electrode.


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