Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 5, Issue 11, Pages 5332-5341Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ta00114b
Keywords
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Funding
- National Natural Science Foundation of China [21671205, U1407103, 21373189]
- Henan Province [15HASTIT003]
- Zhengzhou University [1421316035]
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Pyrite, FeS2, is a promising sodium battery electrode candidate owing to its abundance in natural resources; however, it suffers from poor cyclic performance and poor rate performance, which hinders its large-scale commercial application. The semiconductor nature of pyrite as well as the dissolution of polysulfide and the destruction of the morphology of pyrite during the charge/discharge process are the main reasons for the abovementioned two drawbacks. In this study, a well-designed FeS2/rGO-A composite was constructed using an ambient temperature reaction. The introduction of rGO-A improved the conductivity of the entire material without hindering sodium ion diffusion; it also confined the pulverized active material to prevent its loss. Additionally, by controlling the cutoff voltage above 0.8 V, the formation of polysulfide was avoided. As a result, the FeS2/rGO-A electrode displays both excellent cyclic performance (low decay rate of 0.051% per cycle over 800 cycles at 1C) and rate performance (more than 70% discharge capacity is retained at 5C compared to 0.1C). The unique electrochemical mechanism was also investigated in detail. A new perspective of pyrite electrochemical behavior was obtained. This study provides not only a theoretical basis for further study, but may also enable the large-scale commercial application of sodium-ion batteries.
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