High-rate, high capacity ZrO2 coated Li[Li1/6Mn1/2Co1/6Ni1/6]O2 for lithium secondary batteries |
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Authors: | Gu-Yeon Kim Yong Joon Park Kwang Hee Jung Dae-Jin Yang Ju Wook Lee Ho-Gi Kim |
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Affiliation: | (1) Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, 373-1 Guseong-dong, Yuseong-gu, Daejeon, 305-701, South Korea;(2) Division of Advanced Industrial Engineering, Kyonggi University, 94-6 Yiui-dong, Yeongtong-gu, Suwon, Kyonggi-do, South Korea;(3) IT Convergence & Components Laboratory, Electronics and Telecommunications Research Institute, 161 Gajeong-dong, Yuseong-gu, Daejeon, 305-350, South Korea |
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Abstract: | Recently, there have been many reports on efforts to improve the rate capability and discharge capacity of lithium secondary
batteries in order to facilitate their use for hybrid electric vehicles and electric power tools. In the present work, we
present a ZrO2-coated LiLi1/6Mn1/2Co1/6Ni1/6]O2. The bare LiLi1/6Mn1/2Co1/6Ni1/6]O2 shows a high initial discharge capacity of 224 mAh g−1 at a 0.2 C rate. Owing to the stability of ZrO2, it was possible to enhance the rate capability and cyclability. After 1 wt% ZrO2 coating, the ZrO2-coated LiLi1/6Mn1/2Co1/6Ni1/6]O2 showed a high discharge capacity of 115 mAh g−1 after 50 cycles under a 6 C rate, whereas the bare LiLi1/6Mn1/2Co1/6Ni1/6]O2 showed a discharge capacity of only 40 mAh g−1 and very poor cyclability under the same conditions. Based on results of XRD and EIS measurements, it was found that the
ZrO2 suppressed impedance growth at the interface between the electrodes and electrolyte and prevented collapse of the layered
hexagonal structure. |
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Keywords: | ZrO2 coating Rate capability HEVs Lithium batteries |
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