期刊
ACS APPLIED MATERIALS & INTERFACES
卷 10, 期 13, 页码 10945-10954出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b00931
关键词
sulfides; solid solution; sodium-ion batteries; sodium-ion capacitors; DFT calculations
资金
- National Nature Science Foundation of China [21471090, 61527809]
- Key Research and Development Programs of Shandong Province [2017GGX40101]
- Taishan Scholarship in Shandong Provinces [ts201511004]
Transition-metal sulfides/selenides are explored as advanced electrode materials for nonaqueous sodium-ion capacitors, using FeS2-xSex as an example. A solid solution of S/Se in FeS2-xSex allows it to combine the high capacity of FeS2 and the good diffusion kinetics of FeSe2 together, thereby exhibiting excellent cycle stability (similar to 220 mA h g(-1) after 6000 cycles at 2 A g(-1)) and superior rate capability (similar to 210 mA h g(-1) at 40 A g(-1)) within 0.8-3.0 V. These results are much better than those of FeS2 and FeSe2, confirming the advantages of S/Se solid solution, as supported by EIS spectra, DFT calculations, and electronic conductivity. As FeS2-xSex is paired with the activated carbon (AC) as Na-ion capacitors, this device is also better than sodium-ion batteries of FeS2-xSex/Na3V2(PO4)(3) and sodium-ion capacitors of metal oxides//AC, particularly at high rates. These results open a new door for the applications of sulfides/selenides in another device of electrochemical energy storage.
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