Abstract
In this work, reduced graphite oxide (rGO) with a long-range-ordered layered structure and an expanded interlayer spacing is synthesized and utilized as an anode for sodium ion storage. Unlike Na+-solvent co-intercalation in flake graphite, the interaction between Na-ions and graphene layers of the rGO shows a capacitive behavior. All the surface defects, pores, and functional groups generated on the surface of rGO can contribute to additional capacity of sodium storage. Thereby, a reversible capacity of 145.7 mAh g−1 at 1 A g−1 and a rate performance of 131.7 mAh g−1 at 1.8 A g−1 could be obtained. Capacity retention of 87.7 % after 900 cycles at 400 mA g−1 was also achieved. Further enhancement in cycling stability, with little capacity decay after 1500 cycles, was obtained after incorporating Ag onto the surface of the rGO. The rGO-Ag anode delivered higher energy density and power density as compared to rGO at the same current density. Even at a power density of 5493 W kg−1 (3A g−1, 24 C), the energy density was as high as 236.2 Wh kg−1. These results contribute to the development of a low-cost, high-performance sodium ion storage devices.
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Acknowledgements
This work was supported by the National Key Research and Development Program of China (Grant No. 2016YFA0601301), the National Natural Science Foundation of China (Grant No. 51572247), and the Natural Science Foundation of Shandong Province of China (Grant No. ZR2014EMM003). We also thank Professor Guanglei Cui of Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences for his help in the work of cell assembling.
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Li, H., Li, Q., Li, L. et al. A modified reduced graphite oxide anode for sodium ion storage in ether‐based electrolyte. J Appl Electrochem (2021). https://doi.org/10.1007/s10800-021-01538-0
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Keywords
- Sodium ion storage
- Reduced graphite oxide
- Co‐intercalation
- Ether‐based electrolyte