期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 7, 期 4, 页码 1749-1755出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta10860a
关键词
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资金
- Shenzhen Science and Technology Research Grant [JCYJ20170412150450297]
- National Natural Science Foundation of China [21622407, 21875266]
In this study, we employed Na2CoFe(CN)(6) (CoHCF), which was synthesized by a commonly used co-precipitation method, as the cathode material for aqueous sodium-ion batteries (ASIBs). By adding an electrolyte additive (1wt% CoSO4) in the aqueous electrolyte (1 M Na2SO4), the framework structures were stabilized and the cycle stability was significantly improved (100% capacity retention at a current density of 2C (1C = 120 mA g(-1))) after 100 cycles without affecting the initial reversible capacity. Long-term cycle tests (2000 cycles) at current densities of 10C and 20C were also performed and indicated similar improvement. The XRD, FT-IR, and ICP-AES results demonstrated that better structure maintenance of the CoHCF framework can be realized when Co2+ ions were added. We suggest that such a simple method can be extended to all PBAs to improve the overall performance of SIBs effectively.
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