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锂离子电池正极材料LiMn₂O₄的合成与晶体结构（英文）

Synthesis and Crystal Structure of LiMn₂O₄ Cathode Material for Li-ion Battery

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【Author】 RUAN Yan-Li1 TANG Zhi-Yuan*,1 HAN En-Shan2 FENG Ji-Jun1(1Department of Applied Chemistry, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072)(2Department of Applied Chemistry, School of Chemical Engineering and Technology,Hebei University of Technology , Tianjin 300130)

【机构】天津大学化工学院应用化学系；河北工业大学化工学院应用化学系；天津大学化工学院应用化学系天津300072；天津300072；天津300130；天津300072；

【Abstract】 Spinel LiMn2O4 powders were prepared using two-step synthesis method consisting of solid-state reaction method and citrate modified sol-gel method. The effects of the calcination temperature and the Li/Mn ratio of raw materials were studied on the physicochemical and electrochemical properties of the spinel LiMn2O4 powders, such as crystallinity, lattice constant and density. The title compound was characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Polycrystalline LiMn2O4 powers calcined at 750 ℃ were found to be composed of very uniformly-sized microcrystal with an average particle size of 300 nm. The improvement in electrochemical properties was mainly attributed to the process of re-grinding by absolute alcohol.更多还原