Capturing the differences between lithiation and sodiation of nanostructured TiS2 electrodes

Pu Hu, Bo Wang, Dongdong Xiao, Katerina E Aifantis

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

In this study TiS2 is chosen as a model electrode material to investigate the relationship between the electrochemical and mechanical performance of layered cathodes for Na-ion batteries. Employing NaFP6 in EC/DMC as the electrolyte allowed for the most promising electrochemical properties recorded in the literature, namely a reversible capacity of 203 mAh g−1 at 0.2 C and 88 mAh g−1 at 10 C with a capacity retention of 92% over 50 cycles. Despite this promising performance the capacity still decayed during long term cycling. In-situ x-ray diffraction and high-resolution transmission electron microscopy imaging revealed that TiS2 underwent a large expansion of 17.7% along the c direction and irreversible phase transformations took place during the sodiation/de-sodiation process, which lead to severe mechanical strains and intragranular cracks. In comparison, the mechanical stability of TiS2 in Li-ion cells was significantly higher. The experimental results are interpreted within a continuum mechanics model which revealed that the maximum effective von Mises stress that is present at the interface between the ion-intercalated TiS2 and pristine TiS2 is about four times higher during sodiation than lithiation indicating that the electrode is more susceptible to failure/fracture during sodiation.

Original languageEnglish (US)
Article number103820
JournalNano Energy
Volume63
DOIs
StatePublished - Sep 1 2019

Fingerprint

Ions
Electrodes
Continuum mechanics
Mechanical stability
High resolution transmission electron microscopy
Electrochemical properties
Electrolytes
Cathodes
Diffraction
Phase transitions
Cracks
Imaging techniques
X rays
Direction compound

Keywords

  • Cathodes
  • Fracture
  • Na-ion battery
  • Stability
  • TiS

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)
  • Electrical and Electronic Engineering

Cite this

Capturing the differences between lithiation and sodiation of nanostructured TiS2 electrodes. / Hu, Pu; Wang, Bo; Xiao, Dongdong; Aifantis, Katerina E.

In: Nano Energy, Vol. 63, 103820, 01.09.2019.

Research output: Contribution to journalArticle

@article{e79f8f654c074640992be72df895e71f,
title = "Capturing the differences between lithiation and sodiation of nanostructured TiS2 electrodes",
abstract = "In this study TiS2 is chosen as a model electrode material to investigate the relationship between the electrochemical and mechanical performance of layered cathodes for Na-ion batteries. Employing NaFP6 in EC/DMC as the electrolyte allowed for the most promising electrochemical properties recorded in the literature, namely a reversible capacity of 203 mAh g−1 at 0.2 C and 88 mAh g−1 at 10 C with a capacity retention of 92{\%} over 50 cycles. Despite this promising performance the capacity still decayed during long term cycling. In-situ x-ray diffraction and high-resolution transmission electron microscopy imaging revealed that TiS2 underwent a large expansion of 17.7{\%} along the c direction and irreversible phase transformations took place during the sodiation/de-sodiation process, which lead to severe mechanical strains and intragranular cracks. In comparison, the mechanical stability of TiS2 in Li-ion cells was significantly higher. The experimental results are interpreted within a continuum mechanics model which revealed that the maximum effective von Mises stress that is present at the interface between the ion-intercalated TiS2 and pristine TiS2 is about four times higher during sodiation than lithiation indicating that the electrode is more susceptible to failure/fracture during sodiation.",
keywords = "Cathodes, Fracture, Na-ion battery, Stability, TiS",
author = "Pu Hu and Bo Wang and Dongdong Xiao and Aifantis, {Katerina E}",
year = "2019",
month = "9",
day = "1",
doi = "10.1016/j.nanoen.2019.06.016",
language = "English (US)",
volume = "63",
journal = "Nano Energy",
issn = "2211-2855",
publisher = "Elsevier BV",

}

TY - JOUR

T1 - Capturing the differences between lithiation and sodiation of nanostructured TiS2 electrodes

AU - Hu, Pu

AU - Wang, Bo

AU - Xiao, Dongdong

AU - Aifantis, Katerina E

PY - 2019/9/1

Y1 - 2019/9/1

N2 - In this study TiS2 is chosen as a model electrode material to investigate the relationship between the electrochemical and mechanical performance of layered cathodes for Na-ion batteries. Employing NaFP6 in EC/DMC as the electrolyte allowed for the most promising electrochemical properties recorded in the literature, namely a reversible capacity of 203 mAh g−1 at 0.2 C and 88 mAh g−1 at 10 C with a capacity retention of 92% over 50 cycles. Despite this promising performance the capacity still decayed during long term cycling. In-situ x-ray diffraction and high-resolution transmission electron microscopy imaging revealed that TiS2 underwent a large expansion of 17.7% along the c direction and irreversible phase transformations took place during the sodiation/de-sodiation process, which lead to severe mechanical strains and intragranular cracks. In comparison, the mechanical stability of TiS2 in Li-ion cells was significantly higher. The experimental results are interpreted within a continuum mechanics model which revealed that the maximum effective von Mises stress that is present at the interface between the ion-intercalated TiS2 and pristine TiS2 is about four times higher during sodiation than lithiation indicating that the electrode is more susceptible to failure/fracture during sodiation.

AB - In this study TiS2 is chosen as a model electrode material to investigate the relationship between the electrochemical and mechanical performance of layered cathodes for Na-ion batteries. Employing NaFP6 in EC/DMC as the electrolyte allowed for the most promising electrochemical properties recorded in the literature, namely a reversible capacity of 203 mAh g−1 at 0.2 C and 88 mAh g−1 at 10 C with a capacity retention of 92% over 50 cycles. Despite this promising performance the capacity still decayed during long term cycling. In-situ x-ray diffraction and high-resolution transmission electron microscopy imaging revealed that TiS2 underwent a large expansion of 17.7% along the c direction and irreversible phase transformations took place during the sodiation/de-sodiation process, which lead to severe mechanical strains and intragranular cracks. In comparison, the mechanical stability of TiS2 in Li-ion cells was significantly higher. The experimental results are interpreted within a continuum mechanics model which revealed that the maximum effective von Mises stress that is present at the interface between the ion-intercalated TiS2 and pristine TiS2 is about four times higher during sodiation than lithiation indicating that the electrode is more susceptible to failure/fracture during sodiation.

KW - Cathodes

KW - Fracture

KW - Na-ion battery

KW - Stability

KW - TiS

UR - http://www.scopus.com/inward/record.url?scp=85067891600&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85067891600&partnerID=8YFLogxK

U2 - 10.1016/j.nanoen.2019.06.016

DO - 10.1016/j.nanoen.2019.06.016

M3 - Article

AN - SCOPUS:85067891600

VL - 63

JO - Nano Energy

JF - Nano Energy

SN - 2211-2855

M1 - 103820

ER -