Development and investigation of a NASICON‐type high‐voltage cathode material for high‐power sodium‐ion batteries

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. © 2019Wiley-VCHVerlagGmbH&Co

Keywords

Cathodes, Sodium ions, Electric batteries, Coatings, X-ray diffraction, Synchrotrons, Electric conductors, Redox process

Citation

Chen, M., Hua, W., Xiao, J., Cortie, D., Guo, X., Wang, E., Gu, Q., Hu, Z., Indris, S., Wang, X.-L., Chou, S.-L., & Dou, S.-X. (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. doi:10.1002/anie.201912964