Sun, Ho-Hyun Choi, Wonchang Lee, Joong Kee Oh, In-Hwan Jung, Hun-Gi 2024-01-20T07:34:35Z 2024-01-20T07:34:35Z 2021-09-04 2015-02-01 0378-7753 https://pubs.kist.re.kr/handle/201004/125782 Various Ni-rich layered oxide cathodes (above 0.80 Ni content), such as LiNi1-y-zCoyAlzO2 (NCA), are used in electric vehicles (EVs) due to their high capacity (similar to 200 mAh g(-1) for NCA). However, to improve cycle performance and thermal stability and to ensure longer and safer usage, numerous studies have investigated surface modification, coating, and doping of cathode materials. In this study, we have investigated the characteristics of Li[Ni0.85CoxMn0.15-x]O-2 with various Mn to Co ratios (x = 0-0.15) synthesized by a coprecipitation method. The discharge capacities of the Li[Ni0.85CoxMn0.15-x]O-2 cathodes are similar at around 206 mAh g(-1) at room temperature and 213.8 mAh g(-1) at 55 degrees C between 2.7 and 4.3 V at a 0.2C rate, while the cyclability, thermal stability, and rate capability of all samples differ according to the Mn and Co ratio. The Li[Ni0.85Co0.05Mn0.10]O-2 cathode shows the most promising electrochemical properties under different conditions among the various cathodes evaluated; it displays a high rate capacity (approximately 163 mAh g(-1) at 5C rate) at 25 degrees C and good thermal stability (main exothermic temperature of 233.7 degrees C and relatively low heat evolution of 857.3 J g(-1)). (C) 2014 Elsevier B.V. All rights reserved. English ELSEVIER SCIENCE BV ELECTRODE MATERIALS PHASE-TRANSITIONS THERMAL-BEHAVIOR OPTIMIZATION PERFORMANCE CHALLENGES Control of electrochemical properties of nickel-rich layered cathode materials for lithium ion batteries by variation of the manganese to cobalt ratio Article 10.1016/j.jpowsour.2014.11.075 1 JOURNAL OF POWER SOURCES, v.275, pp.877 - 883 JOURNAL OF POWER SOURCES 275 877 883 scie scopus 000348088400109 2-s2.0-84911889439 Chemistry, Physical Electrochemistry Energy & Fuels Materials Science, Multidisciplinary Chemistry Electrochemistry Energy & Fuels Materials Science Article ELECTRODE MATERIALS PHASE-TRANSITIONS THERMAL-BEHAVIOR OPTIMIZATION PERFORMANCE CHALLENGES Lithium ion battery Cathode Layered oxide Nickel rich Coprecipitation