Preparation and electrochemical properties of layer-structured LiNi1/3Co1/3Mn1/3-yAlyO2

被引:30
作者
Lin, Yu-Kai [1 ]
Lu, Chung-Hsin [1 ]
机构
[1] Natl Taiwan Univ, Dept Chem Engn, Elect & Electroopt Ceram Lab, Taipei 10764, Taiwan
关键词
Layered structure; Sol-gel; Cathode materials; Lithium-ion batteries; ION; INTERCALATION; BATTERIES; OXIDES;
D O I
10.1016/j.jpowsour.2008.08.072
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Layer-structured LiNi(1/3)Co(1/3)Mn(1/3-y)AlyO(2) has been synthesized via a sol-gel method. The lattice constants of LiNi1/3Co1/3Mn1/3-yAlyO2 decrease with the concentration of aluminum ions. XANES analysis further confirms that the valence of cobalt ion is 3+, and that of Ni is between 2+ and 3+ in LiNi1/3Co1/3Mn1/3-yAlyO2. With doping aluminum ions, the redox centers for the electrochemical reaction change from nickel ions alone to both nickel and cobalt ions. The amounts of de-intercalatable lithium ions are affected by the concentration of aluminum ions; however, the extracting efficiency of lithium ions is improved by doping aluminum ions. Among all the samples, LiNi1/3Co1/3Mn0.23Al0.1O2 exhibits the best capacity retention and the least irreversible capacity. (C) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码:353 / 358
页数:6
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