Journal
SOLID STATE IONICS
Volume 279, Issue -, Pages 11-17Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ssi.2015.07.006
Keywords
Lithium nickel cobalt manganese oxide; Atmosphere; Cathode; Zr doping; Electrochemical property
Categories
Funding
- Hefei Center of Materials Science and Technology [2014FXZY006]
- Education Ministry of Anhui Province
Ask authors/readers for more resources
The powders of layered structured LiNi0.5Co0.2Mn0.3O2 cathode material are synthesized by a thermal polymerization method in the temperatures range from 750 degrees C to 950 degrees C in air and oxygen. It is found that the LiNi0.5Co0.2Mn0.3O2 powder sintered in oxygen has significantly decreased degree of cationic mixing. The discharge capacities of the samples sintered in oxygen are higher than those of the samples sintered in air. The sample sintered at 900 degrees C in oxygen has the highest ratio of I-003/I-104 and the highest initial discharge capacities of 200 mAh g(-1) at a rate of 0.1C in the voltage range of 2.8-4.5 V. In order to improve the cycling stability of the LiNi0.5Co0.2Mn0.3O2 electrode, a series of Zr-doped LiNi0.5Co0.2Mn0.3O2 electrodes (LiNi0.5Co0.2Mn0.3-xZrxO2, x = 0.01, 0.02, 0.03, 0.04, 0.05) are also prepared. The LiNi0.5Co0.2Mn0.3-xZrxO2 electrodes show much enhanced cycling performance compared to the un-doped LiNi0.5Co0.2Mn0.3-xZrxO2 electrode, The LiNi0.5Co0.2Mn0.29Zr0.01O2 electrode exhibits the best electrochemical performance with the capacity retention of 93.92% after 100 cycles at 0.2C in the voltage range of 2.8-4.5 V, while the un-doped LiNi0.5Co0.2Mn0.3O2 electrode exhibits capacity retention of only 83.33% after 100 cycles. The LiNi0.5Co0.2Mn0.29Zr0.01O2 electrode also shows obvious improved rate capability relative to that of the un-doped electrode. (C) 2015 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available