Development and Investigation of a NASICON-Type High-Voltage Cathode Material for High-Power Sodium-Ion Batteries
2020 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim Herein, we introduce a 4.0 V class high-voltage cathode material with a newly recognized sodium superionic conductor (NASICON)-type structure with cubic symmetry (space group P213), Na3V(PO3)3N. We synthesize an N-doped graphene oxide-wrapped Na3V(PO3)3N composite with a uniform carbon coating layer, which shows excellent rate performance and outstanding cycling stability. Its air/water stability and all-climate performance were carefully investigated. A near-zero volume change (ca. 0.40 %) was observed for the first time based on in situ synchrotron X-ray diffraction, and the in situ X-ray absorption spectra revealed the V3.2+/V4.2+ redox reaction with high reversibility. Its 3D sodium diffusion pathways were demonstrated with distinctive low energy barriers. Our results indicate that this high-voltage NASICON-type Na3V(PO3)3N composite is a competitive cathode material for sodium-ion batteries and will receive more attention and studies in the future.
Chen, M., Hua, W., Xiao, J., Cortie, D., Guo, X., Wang, E., Gu, Q., Hu, Z., Indris, S., Wang, X., Chou, S. & Dou, S. (2020). Development and Investigation of a NASICON-Type High-Voltage Cathode Material for High-Power Sodium-Ion Batteries. Angewandte Chemie - International Edition, 59 (6), 2449-2456.