Choi, SH Shlyakhtin, OA Kim, J Yoon, YS 2024-01-21T05:33:43Z 2024-01-21T05:33:43Z 2021-09-03 2005-02-02 0378-7753 https://pubs.kist.re.kr/handle/201004/136740 A comparative analysis of the properties of LiNi0.5Mn0.50O2 and Li1-xNi0.5Mn0.5O2 (0.2 less than or equal to x less than or equal to 0.7) powders, obtained by the freeze drying method, was performed. Lattice parameters of Li1+xNi0.5Mn0.5O2 decreased considerably with growing amounts of Li until x = 0.3: at x > 0.5 trace amounts of Li2MnO3 are observed by X-ray diffraction (XRD) patterns. X-ray photoelectron spectroscopy (XPS) analysis displayed an increase of Ni3+/Ni2+ ratio at 0.3 < x < 0.5, while Mn 2p spectra were almost identical in all samples. Rechargeable capacity values (V = 2.5-4.6 V) increased systematically with x reaching its maximum (185-190 mAh g(-1)) at x = 0.5. Samples with supersioichiometric lithium content also demonstrated good C rate characteristics. (C) 2004 Elsevier B.V. All fights reserved. English ELSEVIER LICOO2 Structural and electrochemical properties of Li1+xNi0.5Mn0.5O2+delta (0 <= x <= 0.7) cathode materials for lithium-ion batteries Article 10.1016/j.jpowsour.2004.07.036 1 JOURNAL OF POWER SOURCES, v.140, no.2, pp.355 - 360 JOURNAL OF POWER SOURCES 140 2 355 360 scie scopus 000226707500019 2-s2.0-12144266003 Chemistry, Physical Electrochemistry Energy & Fuels Materials Science, Multidisciplinary Chemistry Electrochemistry Energy & Fuels Materials Science Article LICOO2 secondary Li batteries Li-Ni-Mn oxides cation stoichiometry freeze drying capacity fade