Abstract
Layer-structured LiNi 1/3Co 1/3Mn 1/3− y Al y O 2 has been synthesized via a sol–gel method. The lattice constants of LiNi 1/3Co 1/3Mn 1/3− y Al y O 2 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 LiNi 1/3Co 1/3Mn 1/3− y Al y O 2. 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, LiNi 1/3Co 1/3Mn 0.23Al 0.1O 2 exhibits the best capacity retention and the least irreversible capacity.
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