Confined seeds derived sodium titanate/graphene composite with synergistic storage ability toward high performance sodium ion capacitors

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

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Author(s)

  • Zexin Liu
  • Xin Zhang
  • Dajian Huang
  • Bo Gao
  • Chaolun Ni
  • Liang Wang
  • Jiangwei Wang
  • Huiyang Gou
  • Gongkai Wang

Detail(s)

Original languageEnglish
Article number122418
Journal / PublicationChemical Engineering Journal
Volume379
Online published5 Aug 2019
Publication statusPublished - 1 Jan 2020
Externally publishedYes

Abstract

Sodium ion capacitors (SICs) are increasingly being focused, due to the feature of high energy/power densities derived from the integrated energy storage mechanisms, as well as the ubiquitous sodium sources. Practical anodes with exceptional rate capability can circumvent the kinetic mismatch with cathode, boosting energy/power metrics. Herein, a Na2Ti7O15 nanowire/graphene anode is synthesized through an atomic layer deposition (ALD) seeding technique, by which the confined seeds enable Na2Ti7O15 with ultra-high aspect ratio and interweaved structure with graphene nanosheets. The composite delivers a superior rate capability of 60 mAh g−1 at a high rate of 17.7 A g−1, and an exceptional cyclic stability of 90% retention after 10 000 cycles even at 8.85 A g−1. It is demonstrated that the morphology, graphene platform, intrinsically low energy diffusion barrier of Na2Ti7O15, and associated reaction mechanism synergize the electron transport, sodium ion migration, and surface capacitive contribution, giving rise to such a decent electrochemical performance. The SICs deliver high energy/power densities (82.7 Wh kg−1/97.5 W kg−1, 25 kW kg−1 with 16 Wh kg−1 retained), proving a promise particularly at extremely fast charge/discharge condition. The proposed ALD seeding technique can be developed into a technical strategy for synthesizing high performance energy storage materials.

Research Area(s)

  • Anode, Atomic layer deposition, High energy/power densities, High rate capability, Sodium ion capacitors

Citation Format(s)

Confined seeds derived sodium titanate/graphene composite with synergistic storage ability toward high performance sodium ion capacitors. / Liu, Zexin; Zhang, Xin; Huang, Dajian; Gao, Bo; Ni, Chaolun; Wang, Liang; Ren, Yang; Wang, Jiangwei; Gou, Huiyang; Wang, Gongkai.

In: Chemical Engineering Journal, Vol. 379, 122418, 01.01.2020.

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