Abstract
The LiNi0.49Mn1.49Y0.02O4 cathode material was synthesized using the citric acid-assisted sol-gel method by partial substitutions of Ni and Mn with Y in the LiNi0.5Mn1.5O4 material. The influences of Y doping on the structure and electrochemical properties were investigated by means of X-ray diffraction, cyclic voltammetry, galvanostatic charge/discharge tests and AC impedance spectroscopy. The results showed that the introduction of Y into the LiNi0.5Mn1.5O4 greatly improved the cycle performance and rate capability. When the charge and discharge current was 1 C in the potential range from 3.5 to 4.9 V, the LiNi0.49Mn1.49Y0.02O4 electrode delivered the initial discharge capacity of 114.9 mAh?g-1 and 113mAh?g-1 after 100 cycles with the capacity retention of 98.3%. AC impedance data indicated that the LiNi0.49Mn1.49Y0.02O4 electrode had the lower impedance value during cycling, and Y doping effectively stabilized the crystal structure.
Graphical Abstract
Keywords
lithium-ion batteries, LiNi0.5Mn1.5O4, Y doping
Publication Date
2012-04-28
Online Available Date
2012-01-16
Revised Date
2012-01-06
Received Date
2011-11-24
Recommended Citation
Xian-Wen ZHANG, Zheng-Xi ZHANG, Li YANG, Shao-Hua FANG, Long QU.
Synthesis and Electrochemical Properties of Yttrium-Doped LiNi0.49Mn1.49Y0.02O4[J]. Journal of Electrochemistry,
2012
,
18(2): Article 8.
DOI: 10.61558/2993-074X.2894
Available at:
https://jelectrochem.xmu.edu.cn/journal/vol18/iss2/8
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