The Study Of Compoments Analysis On Cathode Materials For Lithium-ion Battery

With the rapidly development of electronic and information industries in the world, the demand for mobile power are increased in many fields such as: cell phones, notebook computers, electric vehicle, military equipment and space technology. The lithium-ion batteries receive much concerns because of its high voltage, high energy density, low self discharge rate, no memory, good safety, long cycling life and non-pollution. Among the numerous lithium-ion batteries materials, spinel LiMn₂O₄ is one of the most promising anode materials beeause of its abundant resources, low cost, nontoxicity, environmental acceptability.This master dissertation has been described the development of lithium-ion batteries, synthesized the spinel LiMn₂O₄ cathode material by solid state reaction method and sol-gel method, established the analytical method of lithium, manganese, aluminium, fluorine. The main contents are as follows:Firstly, a general introduction is given on following aspects: the development and status of the lithium-ion batteries, working principle, common cathode materials. Especially the development of spinel LiMn₂O₄ and analytical methods for lithium, manganese and the average valence of manganese, aluminium, fluorine.Secondly, This paper explores the analytical method of lithium, manganese, aluminium, fluorine. The differential spectrophotometry was used to determine high content manganese in cathode materials of lithium-ion batteries. Simultaneously, the optimum measurement conditions were studied. Determination average manganese valence in cathode material LiMn₂O₄ of lithium-ion battery were studied by chemical caluation method. Meanwhile, we studied the determination of manganese(â…£); Thorin spectrophotometric was used to determine lithium in cathode materials of cathode materials of lithium-ion batteries. At the same time, the optimum measurement conditions were studied. The aluminium in cathode materials of lithium-ion battery were studied by ethanol precipitate Manganese-KF displacement-EDTA volumetric method in alkalinity medium. Also, the optimum measurement conditions were studied. Fluor reagent spectrophotometric was used to determine lithium in cathode materials of cathode materials of lithium-ion batteries. Also, the optimum measurement conditions were studied.Finally, the evaluation of thoes methods uncertainty were studied. we analyzed the uncertainty in determination of lithiun, aluminium, fluorine in cathode materials of lithium- ion batteries. The main sources of uncertainties were obtained.In this master dissertation, we studied the analytical methods of lithium, manganese, aluminium, fluorine in spinel LiMn₂O₄ and evaluation the uncertainty of lithium, aluminium, fluorine.