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Abstract
Nickel-substituted manganese spinel, LiNi<sub>0.5</sub>Mn<sub>1.5</sub>O<sub>12</sub> has been studied as one of alternatives for the cathode materials of the high-power lithium secondary batteries. LiNi<sub>0.5</sub>Mn<sub>1.5</sub>O<sub>12</sub> compound was prepared by mechanochemical process. and the structure and electrochemical properties of these compounds were investigated by XRD, SEM and charge- discharge tests. electrochemical properties of the Li-ion battery with a LiNi<sub>0.5</sub>Mn<sub>1.5</sub>O<sub>12</sub> were improved by efficient annealing process. The heat treatment conditions were optimized to achieve the best electrochemical properties. The compound was calcined at 600℃ for 12hours, 900℃ for 20 hours followed by annealing process. LiNi<sub>0.5</sub>Mn<sub>1.5</sub>O<sub>4</sub> compound which underwent holding step at 600℃ for 12 hours in air during annealing process showed the high specific discharge capacities at 4.7 V plateau and also good cycle performance. The impurity phase and specific discharge capacities at 4.1 V plateau was reduced by efficient annealing process.
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