NaTi2(PO4)3 hollow nanoparticles encapsulated in carbon nanofibers as novel anodes for flexible aqueous rechargeable sodium-ion batteries. (April 2021)

• Record Type: Journal Article
• Authors: He, Bing; Yin, Kuibo; Gong, Wenbin; Xiong, Yuwei; Zhang, Qichong; Yang, Jiao; Wang, Zhixun; Wang, Zhe; Chen, Mengxiao; Man, Ping; Coquet, Philippe; Yao, Yagang; Sun, Litao; Wei, Lei
• Is Part Of: Nano energy. Volume 82(2021)
• Publication Date: 2021-04
• Subjects: NaTi2(PO4)3 -- Hollow structure -- Electrospinning -- Binder-free anodes -- Aqueous sodium-ion batteries; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2021.105764
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: NASICON‐structured NaTi2 (PO4 )3 (NTP) is an attractive anode material for aqueous rechargeable sodium-ion batteries (ARSIBs) thanks to its three-dimensional open framework and appropriate negative voltage window. Nevertheless, the lack of flexible and high-performance binder-free NTP-based anodes remains stumbling blocks to the development of wearable ARSIBs. Herein, hollow-structure NTP evenly encapsulated in cross-linked porous N-doped carbon nanofiber (HNTP@PNC) is prepared through electrospinning technology and subsequent carbonization treatment, directly acting as binder-free anode for flexible ARSIBs. Benefiting from its unique hollow structure, continuous conductive network and favorable synergistic effect, the HNTP@PNC electrode displays as high as of 108.3 mAh g −1 rate capacity at 5.50 A g −1 and an impressive cycling stability of 97.2% capacity retention after 3000 cycles. Further, theoretical calculations reveal that NTP with NC coating significantly enhances electronic conductivity and accelerates Na + diffusion kinetics. Pairing with potassium zinc hexacyanoferrate free-standing cathode, a prototype quasi-solid-state ARSIB with a high-voltage discharge plateau of 1.6 V is successfully constructed, achieving a high volumetric capacity of 24.5 mAh cm −3 and an admirable energy density of 39.2 mWh cm −3, outperforming most reported flexible aqueous rechargeable energy-storage devices. These exciting results provide valuable intuition into the design of novel binder-free NTP-based anodes for next-generation wearable ARSIBs. Graphical Abstract: ga1 Highlights: A facial template-free solvothermal method was developed to synthesize the rugby-like NTP nanoparticles with well-defined hollow structures. By combining with an electrospinning technique and subsequent carbonization treatment, HNTP@PNC was prepared and firstly served as the binder-free anode for flexible ARSIBs. A quasi-solid-state ARSIB achieves high volumetric capacity (24.5 mAh cm −3 ) and admirable energy density (39.2 mWh cm −3 ).