Preparation And Characterization Of Lithium Battery Cathode Materials LiNi_0.5Mn_0.5O₂

Lithium-ion battery is a new type of energy, which in its non-polluting, can reduce carbon emissions and other advantages, starting as a substitute for traditional energy sources. Such as the automobile industry has been using the lithium-ion battery to replace the traditional energy sources. However, small capacity, the output voltage is low, has restricted the short cycle life of lithium-ion battery development. LiCoO2 as the cathode material used has a high cost and pollution major shortcomings, LiNiO2 synthetic difficulties, LiNi0.5Mn0.5O2 both manganese oxide and nickel oxide with the advantages of lithium-ion battery development as the new direction. With the popularity of portable electric devices and electric vehicle development, development of high performance, safety of low-cost﹑ lithium-ion batteries as lithium-ion battery industry center. Layered manganese lithium ion battery cathode material is in line with this background needs.This paper selects LiNi0.5Mn0.5O2 object of study, preparation methods, synthesis conditions were studied, and LiNi0.5Mn0.5O2 cathode material were characterized using a variety of ways. Specific frequency used by inductively coupled plasma emission spectroscopy, X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, cyclic voltammetry methods.The results are: lithium hydroxide, Ni (NO3) 2 ? 6H2O and Mn (Ac) 2 ? 4H2O, was prepared by co-precipitation method LiNi0.5Mn0.5O2 cathode material is superior than other methods to, and calcined at 900℃12 hours LiNi0.5Mn0.5O2 prepared by quenching the most excellent material. ICP analysis showed that nickel, manganese molar ratio of 1:1, XRD close to the standard spectrum, Raman spectrum as a standard sample materials,α-NaFeO2 layered structure is hexagonal. SEM analysis showed that the crystal structure of a good size is about 200 nm or so, XPS analysis showed the traces of manganese, near-ideal theory. Cycle performance, 0.3C discharge rate, the capacity retention after 40 cycles in about 65.88 mAh·g-1.