title: Synthesis and electrochemical performance of 0.3Li2MnO3 x 0.7LiMO2 (M = Mn, Co, Ni) cathode materials for Li-lon batteries.
abstract: The Mn0.720Ni0.175Co0.105(OH)2 precursor was co-precipitated by the Couette-Taylor reactor. The 0.3Li2MnO3 x 0.7LiMn0.60Ni0.25Co0.15O2 of the high capacity cathode material for a Li-ion battery was synthesized according to the amount of lithium excess (5-20 mol.%). X-ray diffraction (XRD) and field emission-scanning electron microscopy (FE-SEM) were used to characterize the 0.3Li2MnO3 x 0.7Li-Mn0.60Ni0.25Co0.15O2. Based on the XRD patterns and FE-SEM images, the 5 and 10 mol.% lithium excess samples were observed for spinel structure. The 15 and 20 mol.% lithium excess samples were not observed for the structure. We can conclude that the spinel structure was made in 0.3Li2MnO3 x 0.7LiMn0.60-Ni0.25Co0.15O2, due to a lack of lithium. The discharge specific capacity of 5, 10, 15, and 20 mol.% lithium excess were measured at 216, 246, 262, and 261 mA h g(-1), respectively. Cyclic voltammograms show that the Li2MnO3 has a lower lithium influence than a spinel or layered structure. Based on these experiment results, we can conclude that the best Li source amount of the 0.3Li2MnO3 x 0.7LiMn0.60-Ni0.25Co0.15O2 synthesis is a 15 mol.% excess.
authors.affiliation: Battery Research Center, Korea Electrotechnology Research Institute, Changwon 642-120, Korea.
authors.forename: Seong-Hyeon
authors.initials: SH
authors.lastname: Ryu
authors.forename: Bong-Soo
authors.initials: BS
authors.lastname: Jin
authors.forename: Jik-Soo
authors.initials: JS
authors.lastname: Kim
authors.forename: Suk-Joon
authors.initials: SJ
authors.lastname: Park
authors.forename: Chang Woo
authors.initials: CW
authors.lastname: Lee
authors.forename: Hyun-Soo
authors.initials: HS
authors.lastname: Kim
mesh_terms: D003460:Crystallization / Q000379:methods; D004553:Electric Conductivity; D011211:Electric Power Supplies; D004566:Electrodes; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007477:Ions; D008094:Lithium / Q000737:chemistry*; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure*; D008968:Molecular Conformation; D010316:Particle Size; D013499:Surface Properties
chemical_list: D007477:Ions; D046911:Macromolecular Substances; D008094:Lithium