Journal
JOURNAL OF POWER SOURCES
Volume 275, Issue -, Pages 877-883Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2014.11.075
Keywords
Lithium ion battery; Cathode; Layered oxide; Nickel rich; Coprecipitation
Funding
- National Research Foundation of Korea - Korean Government (MEST) [NRF-2010-C1AAA001-2010-0028958]
- KIST institutional program [2E24664, 2E25087]
- National Research Council of Science & Technology (NST), Republic of Korea [2E24664] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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.
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