Highly efficient, fast and reversible multi-electron reaction of Na3MnTi(PO4)3 cathode for 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)

  • Ming Xu
  • Chunhui Gao
  • Wei Zhang
  • Zhian Zhang
  • Yanqing Lai
  • Lifang Jiao

Related Research Unit(s)

Detail(s)

Original languageEnglish
Pages (from-to)325-333
Journal / PublicationEnergy Storage Materials
Volume26
Online published9 Nov 2019
Publication statusPublished - Apr 2020

Abstract

The sodium super ionic conductor (NASICON) structured Na3MnTi(PO4)3 is attractive due to the eco-friendly and low-cost Na–Mn–Ti–P–O system. However, Na3MnTi(PO4)3 suffers from low Coulombic efficiency, inferior electronic conductivity and limited specific capacity basing on two-sodium-exchange. To address these multifaceted issues, herein, an interpenetrating graphene encapsulated Na3MnTi(PO4)3 particles with carbon-shell covering material (rGO@NMTP-C) was synthesized. By regulating cut-off voltages, a three-electron reaction was realized and Coulombic efficiency of the rGO@NMTP-C was found to increase from <96% to 100% due to the fast kinetics that enhanced by Ti3+/Ti4+ redox, which was verified by EIS and GITT. Sodium storage mechanism of the multielectron reaction was deeply studied by ex-situ XRD and DFT calculations. It shows that the enhanced reversibility synergizing with multifunctional 3D conductive network and the contribution of pseudocapacitance, makes rGO@NMTP-C a promising cathode candidate, which can exhibit a remarkable discharge capacity of 173 mA h g−1. Additionally, for the first time, the rGO@NMTP-C achieves outstanding high rate capability of 92.4 mA h g−1 at 50C, and cycling stability of 74.5% of capacity retention after 3500 cycles at 20C. High performance full cells were also realized for practical utilization of SIBs.

Research Area(s)

  • Cathode, Graphene, Na3MnTi(PO4)3, NASICON, Sodium-ion batteries

Citation Format(s)

Highly efficient, fast and reversible multi-electron reaction of Na3MnTi(PO4)3 cathode for sodium-ion batteries. / Li, Huangxu; Xu, Ming; Gao, Chunhui; Zhang, Wei; Zhang, Zhian; Lai, Yanqing; Jiao, Lifang.

In: Energy Storage Materials, Vol. 26, 04.2020, p. 325-333.

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