Na superionic conductor (NASICON)-type Na3V2(PO4)3 (NVP) has been regarded as a promising cathode material for sodium-ion batteries (SIBs). However, NVP suffers from poor cyclability and rate capability because of its intrinsically low electronic conductivity. Herein, we successfully synthesized N-doped carbon-wrapped Na3V2(PO4)3 (NC@NVP) through the carbonization of polydopamine, which is rich in nitrogen species. The strong adhesion properties of the polydopamine lead to effective and homogeneous wrapping of NVP particles, and it is further turned into a conductive N-doped carbon network itself, providing facile diffusion of electrons and Na+ ions during battery operation. NC@NVP displays remarkable electrochemical performance, even under harsh operating conditions, such as a high rate capability (discharge capacity of 70.88, 49.21 mA·h·g−1 at 50 and 100 C), long-term cycling stability (capacity retention of 94.77% over 1,000 cycles at 20 C), and high-temperature cycling (capacity retention of 92.0% after 500 cycles at 60 °C).[Figure not available: see fulltext.]
Bibliographical noteFunding Information:
This research was supported by the Basic Science Research Program of the National Research Foundation (NRF) funded by the Ministry of Science & ICT and Future Planning (No. 2018R1A2B2007081). The authors declare no competing financial interest.
© 2018, Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature.
- N-doped carbon
- sodium-ion batteries
ASJC Scopus subject areas
- Materials Science(all)
- Electrical and Electronic Engineering