期刊
SOLID STATE IONICS
卷 262, 期 -, 页码 43-48出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ssi.2013.09.045
关键词
Layered oxides; Positive electrode material; Lithium manganese oxide; Mechanochemical reaction; Synchrotron XRD measurement; Synchrotron XANES measurement
The 5 wt.% Al2O3-coated Li1.20Mn0.55Ni0.16Co0.09O2 was prepared by the mechanochemical reaction. The optimal condition for sample preparation was determined to be the rotation speed of 2000 rpm and the reaction time of 5 min by SEM, XRD, and XANES measurements. Surface analysis using XANES data demonstrated that all the samples were rather uniformly covered with nano-Al2O3 particles. The pristine and 5 wt.% Al2O3-coated samples after the stepwise pre-cycling treatment showed the discharge capacity of 243 and 216 mAh/g at 323 K, respectively. Although the Al2O3-coated sample showed less discharge capacity compared with the pristine sample, the Al2O3-coated sample showed better discharge capacity retention compared with the pristine sample after 35 cycles at 323 K. These results demonstrate that the mechanochemical Al2O3-coating process is an effective way of improving the cycle performance at high temperature. (C) 2013 Elsevier B.V. All rights reserved.
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