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Materials 2017, 10(8), 859; doi:10.3390/ma10080859

Er-Doped LiNi0.5Mn1.5O4 Cathode Material with Enhanced Cycling Stability for Lithium-Ion Batteries

1
R&D Center for New Energy Materials and Devices, State Key Laboratory of Electronic Thin Film and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China
2
Xinyun Electronic Comp. & Dev. Co. Ltd, China Zhenhua Group, Guiyang 550018, China
*
Authors to whom correspondence should be addressed.
Received: 28 June 2017 / Revised: 23 July 2017 / Accepted: 24 July 2017 / Published: 27 July 2017
(This article belongs to the Section Energy Materials)
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Abstract

The Er-doped LiNi0.5Mn1.5O4 (LiNi0.495Mn1.495Er0.01O4) sample was successfully prepared by citric acid-assisted sol-gel method with erbium oxide as an erbium source for the first time. Compared with the undoped sample, the Er-doped LiNi0.5Mn1.5O4 sample maintained the basic spinel structure, suggesting that the substitution of Er3+ ions for partial nickel and manganese ions did not change the intrinsic structure of LiNi0.5Mn1.5O4. Moreover, the Er-doped LiNi0.5Mn1.5O4 sample showed better size distribution and regular octahedral morphology. Electrochemical measurements indicated that the Er-doping could have a positive impact on the electrochemical properties. When cycled at 0.5 C, the Er-doped LiNi0.5Mn1.5O4 sample exhibited an initial discharge capacity of 120.6 mAh·g−1, and the capacity retention of this sample reached up to 92.9% after 100 cycles. As the charge/discharge rate restored from 2.0 C to 0.2 C, the discharge capacity of this sample still exhibited 123.7 mAh·g−1 with excellent recovery rate. Since the bonding energy of Er-O (615 kJ·mol−1) was higher than that of Mn-O (402 kJ·mol −1) and Ni-O (392 kJ·mol−1), these outstanding performance could be attributed to the increased structure stability as well as the reduced aggregation behavior and small charge transfer resistance of the Er-doped LiNi0.5Mn1.5O4. View Full-Text
Keywords: Lithium-ion battery; LiNi0.5Mn1.5O4; Er-doping; citric acid-assisted sol-gel method; cycling stability Lithium-ion battery; LiNi0.5Mn1.5O4; Er-doping; citric acid-assisted sol-gel method; cycling stability
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Liu, S.; Zhao, H.; Tan, M.; Hu, Y.; Shu, X.; Zhang, M.; Chen, B.; Liu, X. Er-Doped LiNi0.5Mn1.5O4 Cathode Material with Enhanced Cycling Stability for Lithium-Ion Batteries. Materials 2017, 10, 859.

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