Preparation and electrochemical properties of layer-structured LiNi1/3Co1/3Mn1/3-yAlyO2
Journal
Journal of Power Sources
Journal Volume
189
Journal Issue
1
Pages
353-358
Date Issued
2009
Author(s)
Lin Y.-K.
Abstract
Layer-structured LiNi1/3Co1/3Mn1/3-yAlyO2 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. ? 2008 Elsevier B.V. All rights reserved.
Subjects
Cathode materials
Layered structure
Lithium-ion batteries
Sol-gel
SDGs
Other Subjects
Alumina; Aluminum; Cathodes; Cobalt; Electrochemical properties; Extraction; Gelation; Gels; Lattice constants; Lithium; Lithium alloys; Lithium batteries; Lithium compounds; Manganese; Manganese compounds; Nickel; Nickel alloys; Sol-gel process; Sol-gels; Sols; Aluminum ions; Capacity retentions; Cathode materials; Cobalt ions; Concentration of; Electro-chemical reactions; Irreversible capacities; Layered structure; Lithium ions; Lithium-ion batteries; Nickel ions; Redox centers; Sol-gel; Sol-gel methods; XANES analysis; Ions
Type
journal article