Abstract
LiNi0.5Mn1.5O4, the cathode material for 5V lithium ion batteries, was synthesized through the coprecipitation-combustion process in air. The effect of tempering temperature on the structure, morphology and electrochemical performances were investigated. The phase and electrochemical properties of the samples were characterized by powder X-ray diffraction, scanning electron microscopy and constant current charge-discharge tests. The experimental results indicate that the samples tempered at 800°C-900°C all have spinel structure, with the increase of tempering temperature, the crystallinity and grain size of the sample increase.The sample tempering at 850°C has well-developed crystals, moderate crystal size and the best electrochemical performance.
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