Journal
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
Volume 18, Issue 5, Pages 3433-3440Publisher
AMER SCIENTIFIC PUBLISHERS
DOI: 10.1166/jnn.2018.14700
Keywords
xLi(2)MnO(3) center dot (1-x)LiMO2; Yb3+ Doping Modification; Sol-Gel Method; Electrochemical Properties
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Funding
- NSAF [U1330135]
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The Li-1.20[Mn0.54Ni0.13Co0.3](0.80-x) YbxO2 (x = 0, 0.01, 0.02, 0.03) cathode materials have been synthesized by using sol-gel method and characterized by means of XRD, SEM, ICP-OES analysis. The galvanostatic charge-discharge tests results showed the improved electrochemical properties were obtained through the Yb3+ doping modification. With the increase of Yb3+ doping content, the capacity retentions enhanced from 85.6% to 88.9% and then decrease to 86.5% after 100 cycles with x = 0.01, 0.02 and 0.03, respectively, while the un-doped sample delivered the capacity retention of 83.0%. Besides, the discharge capacity of Li-1.20 [Mn0.54Ni0.13Co0.13](0.78)Yb0.02O2 was about 23.1 mAh g(-1) larger than that of un-doped sample at 5C high rate. The electrochemical impedance spectroscopy (EIS) and cyclic voltammetric results indicated that the Yb3+ doping modification could suppress the layered-spinel phase transformation during cycling and maintain a lower value of charge transfer impedance.
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