TiO2 Nanocrystal-Framed Li2TiSiO5 Platelets for Low-Voltage Lithium Battery Anode

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

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Author(s)

  • Di He
  • Boya Wang
  • Tianhao Wu
  • Heng Su
  • Xu Zhang
  • Gui-Liang Xu
  • Zhiwei Liu
  • Jinshu Wang
  • Khalil Amine
  • Haijun Yu

Detail(s)

Original languageEnglish
Article number2001909
Journal / PublicationAdvanced Functional Materials
Volume30
Issue number45
Online published26 Aug 2020
Publication statusPublished - 4 Nov 2020
Externally publishedYes

Abstract

Titanium-based anode materials are attracting considerable attention for use in high-performance lithium-ion batteries, but the compromised energy density caused by high voltage plateaus and unsatisfactory capacities severely retards their practical applications. Herein, a molten-salt synthesis of Li2TiSiO5 crystalline platelets and a subsequent selective facet modification by in situ growth of TiO2 nanocrystal frames are facilely achieved. The discharge voltage plateau at around 0.5 V renders the Li2TiSiO5 anode safe compared with graphite and confers a high energy density compared with zero-strain Li4Ti5O12 anode. With the optimized size, structure, and content of modified TiO2 nanocrystals associated with the exposed (001) plane of Li2TiSiO5, the Li2TiSiO5-based anodes can deliver a capacity of above 300 mAh g−1, enhanced rate performance, and a capacity retention of 66% after 10 000 cycles. In situ X-ray diffraction and ex situ transmission electron microscopy have demonstrated the structural stability of the anodes upon charge/discharge. Further theoretical calculation reveals 3D migration paths of Li+ ions in Li2TiSiO5. The selective modification of in situ grown TiO2 nanocrystals on certain facets of crystallites opens a new door for the development of electrode materials possessing superior electrochemical properties.

Research Area(s)

  • anodes, lithium-ion batteries, nanocrystals, titanium-based oxides, titanosilicates

Citation Format(s)

TiO2 Nanocrystal-Framed Li2TiSiO5 Platelets for Low-Voltage Lithium Battery Anode. / He, Di; Wang, Boya; Wu, Tianhao et al.

In: Advanced Functional Materials, Vol. 30, No. 45, 2001909, 04.11.2020.

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