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Improved electrochemical performance of LiNi0.6Co0.2Mn0.2O2 cathode material synthesized by citric acid assisted sol-gel method for lithium ion batteries

Cited 63 time in Web of Science Cited 66 time in Scopus
Authors
Lee, Suk-Woo; Kim, Hyungsub; Kim, Myeong-Seong; Youn, Hee-Chang; Kang, Kisuk; Cho, Byung-Won; Roh, Kwang Chul; Kim, Kwang-Bum
Issue Date
2016-05
Citation
Journal of Power Sources, Vol.315, pp.261-268
Keywords
Lithium ion batteriesLiNi0.6CO0.2Mn0.2O2Citric acid assisted sol-gel methodOxygen flowing atmosphereHigh performance cathode materialsEnergy efficiency
Abstract
A citric acid assisted sol-gel method is employed for synthesizing LiNi0.6Co0.2Mn0.2O2 for use as a cathode material in lithium-ion batteries. The effects of heat-treatment temperature and oxygen atmosphere on the structural and electrochemical properties of LiNi0.6Co0.2Mn0.2O2 are investigated, in order to determine optimal conditions for the synthesis of LiNi0.6Co0.2Mn0.2O2 via the citric acid assisted sol-gel method. In particular, the presence of oxygen in the atmosphere effectively leads to a decrease in the degree of cation mixing and the formation of LiOH and Li2CO3 on the surface of LiNi0.6Co0.2Mn0.2O2. Furthermore, heat-treatment in an oxygen atmosphere improves the uniformity of oxidation state of Ni ions between the surface and bulk. LiNi0.6Co0.2Mn0.2O2 synthesized by heat-treatment at 850 degrees C under an oxygen atmosphere shows a discharge capacity of 174 mA h g(-1) and 89% capacity retention after 100 cycles. In addition, it shows high rate capability (i.e., 41% capacity retention at 10 C), which is an improved rate performance over a previous report. The results of this study should provide useful information for the synthesis of Ni-rich layered oxides for lithium ion batteries. (C) 2016 Elsevier B.V. All rights reserved.
ISSN
0378-7753
URI
http://hdl.handle.net/10371/165048
DOI
https://doi.org/10.1016/j.jpowsour.2016.03.020
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Material Science and Engineering (재료공학부) Journal Papers (저널논문_재료공학부)
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