High-charge-capacity sodium-ion battery anodes made of Sb2Te3@reduced graphene oxide are reported for the first time. Uniform nano-coating of graphene oxide is carried out from common sol of peroxotellurate and peroxoantimonate under room temperature processing. Reduction by hydrazine under glycerol reflux yields Sb2Te3@reduced graphene oxide. The electrodes exhibit exceptionally high volumetric charge capacity, above 2300 mAh cm−3 at 100 mA g−1 current density, showing very good rate capabilities and retaining 60% of this capacity even at 2000 mA g−1. A comparison of sodiation and lithiation shows that lithiation exhibits better volumetric charge capacity, but surprisingly only marginally better relative rate capability retention at 2000 mA g−1. Tellurium-based electrodes are attractive due to the high volumetric charge capacity of Te, its very high electric conductivity, and the low relative expansion upon lithiation/sodiation.
Bibliographical noteFunding Information:
This research is partially supported by grants from the National Research Foundation , Prime Minister’s Office, Singapore under its Campus of Research Excellence and Technological Enterprise (CREATE) programme. The financial support of Israel Research Foundation and the Ministry of Science is thankfully acknowledged. We thank the Harvey M. Krueger Family Centre for Nanoscience and Nanotechnology of the Hebrew University of Jerusalem and the Israel Science Foundation. We thank the Russian Science Foundation (grant 16-13-00110 ). Appendix A
- Hydrogen peroxide
- Sol gel