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Revealing Charge Transport Mechanisms in Li 2 S 2 for Li–Sulfur Batteries

Journal Article · · Journal of Physical Chemistry Letters
 [1];  [2];  [2]
  1. Texas A & M Univ., College Station, TX (United States). Dept. of Mechanical Engineering and Dept. of Chemical Engineering; Texas A&M University
  2. Texas A & M Univ., College Station, TX (United States). Dept. of Mechanical Engineering and Dept. of Chemical Engineering

Besides lithium sulfide (Li2S), lithium persulfide (Li2S2) is another solid discharge product in lithium-sulfur (Li-S) batteries. Revealing the charge transport mechanism in the discharge products is important for developing an effective strategy to improve the performance of Li-S batteries. Li2S2 cannot transport free electrons due to its wide bandgap between the valence band maximum (VBM) and conduction band minimum (VBM). However, electron polarons (p-) and hole polarons (p+) can appear in solid Li2S2 due to the unique molecular orbital structure of the S22- anion. The thermodynamic and kinetic properties of native defects are investigated. It is found that negatively charged Li vacancies (VLi-) and p+ are the main native defects with a low formation energy of 0.77 eV. The predominant charge carrier is p+ because p+ has a high mobility. Thus, the electronic conductivity related to p+ diffusion is dependent on temperature, and high temperatures are preferred to increase the conductivity.

Research Organization:
Texas A & M Univ., College Station, TX (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Grant/Contract Number:
EE0006832
OSTI ID:
1430632
Journal Information:
Journal of Physical Chemistry Letters, Journal Name: Journal of Physical Chemistry Letters Journal Issue: 7 Vol. 8; ISSN 1948-7185
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (10)

Tailored Reaction Route by Micropore Confinement for Li-S Batteries Operating under Lean Electrolyte Conditions journal May 2018
A Li 2 S-Based Sacrificial Layer for Stable Operation of Lithium-Sulfur Batteries journal October 2018
Revealing reaction mechanisms of nanoconfined Li 2 S: implications for lithium–sulfur batteries journal January 2018
Recent advances in separators to mitigate technical challenges associated with re-chargeable lithium sulfur batteries journal January 2019
Current-density dependence of Li 2 S/Li 2 S 2 growth in lithium–sulfur batteries journal January 2019
Revisiting the positive roles of liquid polysulfides in alkali metal–sulfur electrochemistry: from electrolyte additives to active catholyte journal January 2019
Pressure effect on mechanical stability and ground state optoelectronic properties of Li 2 S 2 produced by Lithium−Sulfur batteries discharge: GGA-PBE, GLLB-SC and mBJ investigation journal July 2019
Mesoscale Physicochemical Interactions in Lithium–Sulfur Batteries: Progress and Perspective journal October 2017
Rate Constants of Electrochemical Reactions in a Lithium-Sulfur Cell Determined by Operando X-ray Absorption Spectroscopy journal January 2018
Sigma-Holes in Battery Materials Using Iso-Electrostatic Potential Surfaces journal January 2018

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