Hole Polaron Diffusion in the Final Discharge Product of Lithium–Sulfur Batteries
Journal Article
·
· Journal of Physical Chemistry. C
- Texas A & M Univ., College Station, TX (United States). Dept. of Mechanical Engineering; Texas A&M University
- Texas A & M Univ., College Station, TX (United States). Dept. of Chemical Engineering
- Texas A & M Univ., College Station, TX (United States). Dept. of Mechanical Engineering
Poor electronic conductivity of bulk lithium sulfide (Li2S) is a critical challenge for the debilitating performance of the lithium–sulfur battery. In this study we focus on investigating the thermodynamic and kinetic properties of native defects in Li2S based on a first-principles approach. It is found that the hole polaron p+ can form in Li2S by removing a 3p electron from an S2– anion. The p+ diffusion barrier is only 90 meV, which is much lower than the Li vacancy (VLi–) diffusion barrier. Hence p+ has the potential to serve as a charge carrier in the discharge product. Once the vacancy–polaron complex (VLi-––2p+) forms, the charge transport will be hindered due to the relatively higher diffusion barrier of the complex. Heteroatom dopants, which can decrease the p+ formation energy and increase VLi– formation energy, are expected to be introduced to the discharge product to improve the electronic 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:
- 1430595
- Alternate ID(s):
- OSTI ID: 1430631
- Journal Information:
- Journal of Physical Chemistry. C, Journal Name: Journal of Physical Chemistry. C Journal Issue: 32 Vol. 121; ISSN 1932-7447
- Publisher:
- American Chemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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