Journal
JOURNAL OF POWER SOURCES
Volume 406, Issue -, Pages 110-117Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2018.10.058
Keywords
Sodium-ion batteries; Layered oxide; Hybrid structures; Cycling stability; Structural degradation
Funding
- National Natural Science Foundation of China [51774051, 51774210]
- Changsha City Fund for Distinguished and Innovative Young Scholars [KQ1707014]
- Hunan Provincial Natural Science Foundation of China [2018JJ2428]
- Scientific Research Fund of Hunan Provincial Education Department [17B002]
- Key Laboratory of Modeling and Monitoring on the Near-Earth Electromagnetic Environments [20170109]
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A critical challenge for the practical use of the layered O3-type binary nickel manganese oxides for sodium-ion batteries is the poor structural stability during extended cycling The approaches of constructing O3/P2 hybrid composites can partially improve the cycling stability, but general approaches sacrifice the advantages of high capacity and low cost of the O3-type cathodes due to excessive sodium deficiency and lithium substitution. Here, we rationally design a serial of novel O3-majority hybrid Na0.9-xNi0.45Mn0.55O2 (x = 0.02, 0.04 and 0.08) cathodes, which exhibit high capacities while maintaining exceptional long-term stability. Particularly, the optimized O3/P2 Na0.88Ni0.45Mn0.55O2 composite delivers 106.7 mA h.g(-1) with 71.1% capacity retention after 250 cycles at 1 C (1C = 150 mA g(-1)), the cyclability is 32% higher than that of the O3-Na0.9Ni0.45Mn0.55O2 cathode; and it also delivers a initial discharge capacity of 75.9 mA h.g(-1), maintaining 72.4% capacity retention after 1000 cycles at 10 C. More importantly, the post-cycling analyses demonstrate O3/P2 hybrid phases successfully suppress the structural degradation of Na0.9Ni0.45Mn0.55O2 during battery operation. This study provides new perspectives in designing high performance cathodes for sodium-ion batteries.
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