Narrow Results

Spinel LiMn₂O₄ was synthesized by solid-state method, using different manganese sources and industrial electrolytic manganese dioxide as the raw materials. Structure and properties of the samples were determined by X-ray diffraction, scanning electron microscope and electrochemical measurements. In the experiment, Mn₂O₃ was selected as the optimal manganese source. And Mn₂O₃ with various impurity content was prepared to study the effects of impurity in manganese sources on the electrochemical performance of spinel LiMn₂O₄. The results showed that the LiMn₂O₄ samples containing various impurity content had spinel structure, and there was not the existence of impurity phase in samples; the particle size and morphology of LiMn₂O₄ had no obvious differences, and particle size was uniform; with the increase of impurity content in the LiMn₂O₄ samples, it had little effect on the initial charge capacity , when the impurity content was too high, the initial charge capacity reduced slightly; the initial discharge specific capacity increased first and decreased later; at the same time, the increase of the impurity content was helpful to improve the cycle performance of the LiMn₂O₄ battery.