Journal
ELECTROCHIMICA ACTA
Volume 216, Issue -, Pages 51-57Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2016.09.003
Keywords
Sodium-ion batteries; Cathode materials; K+ doping; Rate capability
Categories
Ask authors/readers for more resources
Na0.67-xKxMn0.72Ni0.14Co0.14O2 (x = 0, 0.01, 0.03, 0.05) layered cathodes were prepared as the cathode of sodium-ion batteries by a co-precipitation method. The effects of K+ doping were investigated, as the doping amount of K+ could change the structure and finally influence the electrochemical performances. The appropriate content of K+ could expand the Na+ diffusion channel and improve both the cycleability and rate performance. The Na0.66K0.01Mn0.72Ni0.14Co0.14O2 composite showed enhanced cycle performance with an initial capacity of 141 mAh g(-1) and 112 mAh g(-1) maintained after 100 cycles at 2.0C rate. Meanwhile, the pristine Na0.67Mn0.72Ni0.14Co0.14O2 (without K+ doping) showed a lower initial capacity of 112 mAh g(-1) with 67 mAh g(-1) retained after 100 cycles at 2.0C. What's more, the Na0.66K0.01Mn0.72Ni0.14Co0.14O2 sample delivered a high reversible capacity of 88.4 mAh g(-1) even at 8.0C, which was much higher than that of Na0.67Mn0.72Ni0.14Co0.14O2 (35 mAh g(-1)). These results demonstrated that the K+ doping could be a feasible strategy to enhance the performance of layered cathode for sodium ion battery. (C) 2016 Elsevier Ltd. 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