Electrochemical properties of LiNi_{1鈭?span style='font-style: italic'>y}Ti_yO₂ and LiNi_0.975M_0.025O₂ (M = Zn, Al, and Ti) synthesized by the solid-state reaction method

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• 作者：Myoung Youp Song^a ; ^{songmy@jbnu.ac.kr} ; ^{songmy@chonbuk.ac.kr} ; Dong Sub Lee^b ; Hye Ryoung Park^c
• 关键词：A. Layered compounds ; A. Oxides ; C. Electrochemical measurements ; C. X-ray diffraction ; D. Electrochemical properties
• 刊名：Materials Research Bulletin
• 出版年：2012
• 期刊代码：60_00255408
• 类别：ms
• 出版时间：April, 2012
• 卷：47
• 期：4
• 页码：1021-1027
• 文件大小：833 K

摘要

LiNi_1鈭?em>yTi_yO₂ (y = 0.000, 0.012, 0.025, 0.050, 0.100, and 0.150) and LiNi_0.975M_0.025O₂ (M = Zn, Al, and Ti) were synthesized by the solid-state reaction method. The voltage vs. discharge capacity curves for y = 0.012 and y = 0.025 exhibit four distinct plateaus corresponding to phase transitions. Among LiNi_1鈭?em>yTi_yO₂, LiNi_0.975Ti_0.025O₂ has the largest first discharge capacity, 154.8 mAh/g, at a rate of 0.1 C, and a relatively good cycling performance (77%at n = 10). Among LiNi_0.975M_0.025O₂ (M = Zn, Al, and Ti) samples, the LiNi_0.975Ti_0.025O₂ sample had the largest first discharge capacity. The LiNi_0.975Ti_0.025O₂ sample has sharper peaks for the 鈭抎x/|dV| vs. V curves than the LiNi_0.975M_0.025O₂ (M = Zn and Al). The LiNi_0.975Al_0.025O₂ sample, with the first discharge capacity of 128.5 mAh/g at a rate of 0.1 C, has the best cycling performance (98%at n = 10).