Effect of composition change of metals in transition metal sites on electrochemical behavior of layered Li[Co1 ?2x(Li1 / 3Mn2 / 3)x(Ni1 / 2Mn1 / 2)x]O2 solid solutions |
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| Institution: | 1. Thin Film Laboratory, Department of Physics, Sri Venkateswara University, Tirupati 517 502, India;2. Sorbonne Universités, UPMC Univ Paris 06, Institut de Minéralogie, de Physique des Matèriaux et de Cosmochimie (IMPMC), 75005 Paris France;3. Sorbonne Universités, UPMC Univ Paris 06, Laboratoire Physicochimie des Electrolytes et Nanosystèmes Interfaciaux (PHENIX), UMR 8234, 75005 Paris France;1. Department of Chemistry, School of Chemical Technology, Aalto University, P.O. Box 16100, FI-00076 Aalto, Finland;2. Sachtleben Pigments Oy, Titaanitie, FI-28840 Pori, Finland;1. Department of Chemistry, National Taiwan University, Taipei 106, Taiwan;2. Nanoscience and Technology Program, Taiwan International Graduate Program, Academia Sinica, Taipei 115, Taiwan;3. RiteDia Corporation, Hsinchu 303, Taiwan;4. Department of Physics, National Taiwan Normal University, Taipei 116, Taiwan;5. Department of Mechanical Engineering and Graduate Institute of Manufacturing Technology, National Taipei University of Technology, Taipei 10608, Taiwan;1. Department of Chemistry, and Institute for Molecular Science and Fusion Technology, Kangwon National University, Chunchon 200-701, Republic of Korea;2. Department of Advanced Materials Science & Engineering, Kangwon National University, Chunchon 200-701, Republic of Korea;3. Department of Chemistry, Chonnam National University, Gwangju 500-757, Republic of Korea;1. Division of Virology, Defence R&D Establishment (DRDE), Jhansi Road, Gwalior 474002, MP, India;2. Department of Microbiology & Pathology, Army Research & Referral (R&R) Hospital, Delhi Cantt, Delhi, India |
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| Abstract: | Five compositions of LiCo1 ?2x(Li1 / 3Mn2 / 3)x(Ni1 / 2Mn1 / 2)x]O2 solid solutions ( x = 0.1, 0.2, 0.3, 0.4, and 0.5) were synthesized using a sol–gel method with three end members of LiCoO2, Li2MnO3(LiLi1 / 3Mn2 / 3]O2), and LiNi0.5Mn0.5]O2. The compositions of metals in transition metal sites were changed to see the effect of them on electrochemical behavior of the solid solutions. All the samples were nano-sized semi-spherical shaped particles with a layered structure. The reduction of cobalt content (the increase of other metals) in the sites increases the lattice parameters, a and c, resulting in the shift of Raman and XRD peak positions. The discharge capacity fading turned serious at higher Co contents, but it was significantly diminished with the decrease of Co content. At lower Co contents, the capacity increased with cycle numbers. The most stable voltage profile was obtained from the composition of LiLi1 / 15Co3 / 5Ni1 / 10Mn7 / 30]O2 (x = 0.2). |
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