Characterization and Electrochemical Properties of LiNi_0.5Mn_1.5O₄ Prepared by a Carbonate Co-Precipitation Method

摘要

LiNi0.5Mn1.5O4 is synthesized using Ni0.5Mn1.5(CO3)2, which is prepared by a carbonate co- precipitation method at pH values of 7.5, 7.8, 8.0 and 8.3. The Rietveld refinements reveal Li and Nisite substitution in LiNi0.5Mn1.5O4. The preparation pH is found to affect Li and Ni site substitution inLiNi0.5Mn1.5O4. For the compound prepared at a pH of 8.3, high capacity and a high Li ion diffusioncoefficient are achieved.