Cycling performance of LiNi1−yMyO2 (M=Ni, Ga, Al and/or Ti) synthesized by wet milling and solid-state method

被引：0
作者：
Myoung Youp Song
Daniel R. Mumm
Chan Kee Park
Hye Ryoung Park
机构：
[1] Chonbuk National University,Division of Advanced Materials Engineering, Hydrogen & Fuel Cell Research Center, Engineering Research Institute
[2] University of California Irvine,Department of Chemical Engineering and Materials Science
[3] Chonbuk National University,Department of Hydrogen and Fuel Cells Engineering, Specialized Graduate School
[4] Chonnam National University,School of Applied Chemical Engineering
来源：
Metals and Materials International | 2012年 / 18卷
关键词：
energy storage materials; sintering; electrochemistry; X-ray diffraction; LiNi; M; O; (M=Ni, Ga, Al and/or Ti);
D O I：
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学科分类号：
摘要：
The LiNi1−yMyO2 specimens with compositions of LiNiO2, LiNi0.975Ga0.025O2, LiNi0.975Al0.025O2, LiNi0.995Ti0.005O2, and LiNi0.990Al0.005Ti0.005O2 were synthesized by wet milling and a solid-state reaction method. Among all the specimens, LiNi0.990Al0.005Ti0.005O2 has the largest first discharge capacity of 196.3 mAh/g at a rate of 0.1 C. At n=50, LiNiO2 has the largest discharge capacity of 126.7 mAh/g. LiNiO2 has the best cycling performance, its degradation rate of discharge capacity being 0.73 mAh/g/cycle. LiNi0.975Al0.025O2 shows the lowest decrease rate of the first discharge capacity with C rate. An equation describing the variation of the discharge capacity with the number of charge-discharge cycles, n, is obtained. The Williamson-Hall method is applied to calculate the crystallite size and the strain of the samples before and after charge-discharge cycling.
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页码：465 / 472
页数：7
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