کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1291194 | 973348 | 2009 | 6 صفحه PDF | دانلود رایگان |
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.
Journal: Journal of Power Sources - Volume 189, Issue 1, 1 April 2009, Pages 353–358