Ahn, Juhyeon Susanto, Dieky Noh, Jae-Kyo Ali, Ghulam Cho, Byung Won Chung, Kyung Yoon Kim, Jong Hak Oh, Si Hyoung 2024-01-20T00:34:41Z 2024-01-20T00:34:41Z 2021-09-05 2017-08-31 0378-7753 https://pubs.kist.re.kr/handle/201004/122386 In this study, we target to find a new composition for a layered mixed metal oxide, which has a high structural stability and a good electrochemical performance. Our strategy is to alter the transition metal composition focusing on the relative amounts of redox active Ni and Co to the inactive Mn, based on highly-stabilized LiNi1/3Co1/3Mn1/3O2. X-ray absorption near-edge structure and X-ray diffraction analyses show that the degree of cation disorder decreases on increasing the ratio of Ni and Co to Mn, by the presence of Ni3+, suggesting that slightly higher Ni and Co contents lead to improved structural stability. Electrochemical studies demonstrate that LiNi0.4Co0.4Mn0.2O2 cathodes exhibit considerable improvements in both the-reversible capacity and the rate capabilities at a voltage range of 2.5-4.6 V. In situ XRD measurements reveal that LiNi0.4Co0.4Mn0.2O2 maintains a single-phase and undergoes lesser structural variations compared to controlled compositions during a delithiation process up to 4.6 V, while achieving a high reversible capacity over 200 mAh g(-1). As a result, LiNi0.4Co0.4Mn0.2O2 experiences fewer structural degradations during electrochemical cycling, which explains the excellent long-term cycling performance. (C) 2017 Elsevier B.V. All rights reserved. English ELSEVIER X-RAY-DIFFRACTION LI-ION ELECTROCHEMICAL PROPERTIES STRUCTURAL-CHANGES CHARGE LICO1/3NI1/3MN1/3O2 INTERCALATION LICOO2 OXYGEN EDGE Achieving high capacity and rate capability in layered lithium transition metal oxide cathodes for lithium-ion batteries Article 10.1016/j.jpowsour.2017.06.042 1 JOURNAL OF POWER SOURCES, v.360, pp.575 - 584 JOURNAL OF POWER SOURCES 360 575 584 scie scopus 000406818600061 2-s2.0-85021134278 Chemistry, Physical Electrochemistry Energy & Fuels Materials Science, Multidisciplinary Chemistry Electrochemistry Energy & Fuels Materials Science Article X-RAY-DIFFRACTION LI-ION ELECTROCHEMICAL PROPERTIES STRUCTURAL-CHANGES CHARGE LICO1/3NI1/3MN1/3O2 INTERCALATION LICOO2 OXYGEN EDGE Composition High capacity Rate capability Layered transition metal oxide In situ X-ray diffraction Single-phase reaction