Three-dimensional ordered microporous Na3V2(PO4)2F3@C/Carbon cloth as High-rate and stable flexible cathodes for Na-ion and Zn-ion batteries

• Published in: Applied surface science 2023-05, Vol.620, p.156875, Article 156875
• Main Authors: Ling, Rui, Zhao, Shuting, Yang, Chao, Qi, Wentao
• Format: Article
• Language: English
• Subjects: Free-standing cathodes; NVPF@C/CC; Sodium ion batteries; Three-dimensional ordered microporous; Zinc ion batteries
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2023.156875

[Display omitted] •A highly-flexible cathode, three-dimensional ordered microporous Na3V2(PO4)2F3 with nano-carbon coating and anchored on carbon cloth (NVPF@C/CC), is prepared via a simple impregnation method.•The ordered microporous structure facilitates the fast ions diffusion, and the uniform carbon layer onto Na3V2(PO4)2F3 combined with the CC substrate provides a continuous transfer path for electrons.•The robust chemical bonding between NVPF@C and CC substrate prevents the shedding of active substances, which largely enhances the cyclic stability.•Tested either in SIBs or in ZIBs, the flexible NVPF@C/CC exhibits high-rate and stable performances. Sodium ion and zinc ion batteries (SIBs/ZIBs) are promising alternatives to lithium-ion batteries (LIBs), and designing flexible cathodes with high-rate and stable features is the key to meet the development trend of flexibility, portability and with high power and energy densities for energy storage devices. Herein, a highly-flexible cathode, three-dimensional ordered microporous Na3V2(PO4)2F3 with nano-carbon coating and anchored on carbon cloth (NVPF@C/CC), is prepared for SIBs and ZIBs via a simple impregnation method. In the deliberate structure, the ordered microporous structure facilitates the fast ions diffusion, and the uniform carbon layer onto Na3V2(PO4)2F3 combined with the CC substrate provides a continuous transfer path for electrons. In addition, the robust chemical bonding between NVPF@C and CC substrate prevents the shedding of active substances, which largely enhances the cyclic stability. Consequently, tested either in SIBs or in ZIBs, the flexible NVPF@C/CC exhibits high-rate and stable performances. Specifically, for SIBs, the cathode delivers an excellent cyclability (74.6 mAh g−1 at 20C over 2000 cycles, ≈83.8% reserved) and an ultrahigh rate performance (77.6 mAh g−1 at 30C). Therefore, the prepared NVPF@C/CC shows huge potential for flexible energy storage devices and enlightens the rational strategy for dressing flexible electrodes.