期刊
BATTERIES & SUPERCAPS
卷 4, 期 3, 页码 456-463出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/batt.202000226
关键词
sodium-ion full battery; layered transition metal oxide; cathode; porous microcuboid; high energy/power density
资金
- National Natural Science Foundation of China [51772284]
- Recruitment Program of Global Experts
- Fundamental Research Funds for the Central Universities [WK2060000016]
- Natural Science Foundation of Shandong Province [ZR2016BQ41]
The study successfully designed unique one-dimensional P2-type Na0.67Ni0.33Mn0.67O2 porous microcuboids with abundantly exposed {010} facets, demonstrating unprecedented electrochemical performances, including high rate performance and long cycle life. The underlying mechanism of enhanced electrochemical properties of this well-designed material has been deciphered through dynamic analysis, in-situ X-ray diffraction, and structural analysis after cycling.
P2-type Na0.67Ni0.33Mn0.67O2 cathode material generally suffers from poor cycling and rate performance due to fiercely phase variation and low Na+ diffusion kinetic. Although efforts have been made to promote the electrochemical properties through ionic doping, the specific capacity reduction in most cases since the doped cations are electrochemical inactive cannot be neglected. Recently, some pioneering work have demonstrated that the advanced morphological design could significantly improve Na+ intercalation kinetics. But rare researches devote to improving the electrochemical performance on P2-type Na0.67Ni0.33Mn0.67O2 through morphological manipulation. Herein, unique one-dimensional P2-type Na0.67Ni0.33Mn0.67O2 porous microcuboids with abundantly exposed {010} facets have been well designed via a simple one-pot strategy. Due to the reasonable material design, it demonstrates unprecedented electrochemical performances. Particularly, it can deliver high rate performance with 122.1 mAh g(-1) at 5 C, extraordinary cycle life with a capacity retention of 94.6 % after 1500 cycles at 5 C. More importantly, prototype sodium ion full cell could achieve state-of-the-art power density of 1383.1 W kg(-1) with high energy density of 84.7 Wh kg(-1). The underlying mechanism of enhanced electrochemical properties of this well-designed material has been deciphered through dynamic analysis, in-situ X-ray diffraction and structural analysis after cycling.
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