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

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Bing He
  • Kuibo Yin
  • Wenbin Gong
  • Yuwei Xiong
  • Qichong Zhang
  • Jiao Yang
  • Zhixun Wang
  • Zhe Wang
  • Mengxiao Chen
  • Philippe Coquet
  • Yagang Yao
  • Litao Sun
  • Lei Wei

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number105764
Journal / PublicationNano Energy
Volume82
Online published12 Jan 2021
Publication statusPublished - Apr 2021

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.

Research Area(s)

  • Aqueous sodium-ion batteries, Binder-free anodes, Electrospinning, Hollow structure, NaTi2(PO4)3

Citation Format(s)

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

In: Nano Energy, Vol. 82, 105764, 04.2021.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review