期刊
JOURNAL OF POWER SOURCES
卷 342, 期 -, 页码 685-689出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2016.12.116
关键词
Na-ion batteries; Disordered and ordered; Cathode; Na-rich layered oxide
资金
- Chongqing University
- Fundamental Research Funds for the Central Universities [0241005202014, 0903005203403]
- National Natural Science Foundation of China [51572182, 11372104, 11372363, 11332013, 5121543, 21503025, 11632004]
- National University of Singapore
- National Research Foundation, Prime Minister's Office, Singapore [NRF-CRP 8-2011-04]
Structures and electrochemical performances of Na-rich layered cathode Na2RuO3 are studied by substitution of Zr for Ru. Na2Ru0.95Zr0.05O3 exhibits a combination of disordered and ordered stacking state with a weight fraction of 61.57% and 38.43%, respectively. The disordered and ordered Na2Ru0.95Zr0.05O3 exhibits reversible capacity of 137 mAh g(-1) that is consistent with the theoretical capacity at a current density of 1 C. In addition, the material shows good cyclability with a capacity retention of 77% after 200 cycles at current density of 1 C, and the Coulombic efficiency remains at about 99% during cycling. The structural evolutions of the Na-rich layered Na2Ru0.95Zr0.05O3 during de(sodiation) have been investigated and found to proceed via a biphasic mechanism. (C) 2017 Elsevier B.V. All rights reserved.
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