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Surface Modification of Li(Ni0.6Co0.2Mn0.2)O2 Cathode Materials by Nano-Al2O3 to Improve Electrochemical Performance in Lithium-Ion Batteries

by Kwang Soo Yoo 1,*,†, Yeon Hui Kang 1,2,†, Kyoung Ran Im 3 and Chang-Sam Kim 2,*
1
Department of Materials Science and Engineering, University of Seoul, 163, Seoulsiripdae-ro, Dongdaemun-gu, Seoul 02504, Korea
2
Center for Energy Convergence Research, Korea Institute of Science and Technology, 5, Hwarang-ro 14-gil, Seongbuk-gu, Seoul 02792, Korea
3
G-Materials Co., Ltd., 649, Ori-ro, Gwangmyeong-si, Gyeonggi-do 14303, Korea
*
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Materials 2017, 10(11), 1273; https://doi.org/10.3390/ma10111273
Received: 28 September 2017 / Revised: 1 November 2017 / Accepted: 1 November 2017 / Published: 6 November 2017
(This article belongs to the Section Energy Materials)
Al2O3-coated Li(Ni0.6Co0.2Mn0.2)O2 cathode materials were prepared by simple surface modification in water media through a sol-gel process with a dispersant. The crystallinity and surface morphology of the samples were characterized through X-ray diffraction analysis and scanning electron microscopy observation. The Li(Ni0.6Co0.2Mn0.2)O2 cathode material was of a polycrystalline hexagonal structure and agglomerated with particles of approximately 0.3 to 0.8 μm in diameter. The nanosized Al2O3 particles of low concentration (0.06–0.12 wt %) were uniformly coated on the surface of Li(Ni0.6Co0.2Mn0.2)O2. Measurement of electrochemical properties showed that Li(Ni0.6Co0.2Mn0.2)O2 coated with Al2O3 of 0.08 wt % had a high initial discharge capacity of 206.9 mAh/g at a rate of 0.05 C over 3.0–4.5 V and high capacity retention of 94.5% at 0.5 C after 30 cycles (cf. uncoated sample: 206.1 mAh/g and 90.8%, respectively). The rate capability of this material was also improved, i.e., it showed a high discharge capacity of 166.3 mAh/g after 5 cycles at a rate of 2 C, whereas the uncoated sample showed 155.8 mAh/g under the same experimental conditions. View Full-Text
Keywords: lithium-ion batteries; Ni-rich cathode materials; nano-Al2O3 coating; surface modification; electrochemical property lithium-ion batteries; Ni-rich cathode materials; nano-Al2O3 coating; surface modification; electrochemical property
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Yoo, K.S.; Kang, Y.H.; Im, K.R.; Kim, C.-S. Surface Modification of Li(Ni0.6Co0.2Mn0.2)O2 Cathode Materials by Nano-Al2O3 to Improve Electrochemical Performance in Lithium-Ion Batteries. Materials 2017, 10, 1273.

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