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Lithium Bond Chemistry in Lithium-Sulfur Batteries.
- Source :
- Angewandte Chemie International Edition; 7/3/2017, Vol. 56 Issue 28, p8178-8182, 5p
- Publication Year :
- 2017
-
Abstract
- The lithium-sulfur (Li-S) battery is a promising high-energy-density storage system. The strong anchoring of intermediates is widely accepted to retard the shuttle of polysulfides in a working battery. However, the understanding of the intrinsic chemistry is still deficient. Inspired by the concept of hydrogen bond, herein we focus on the Li bond chemistry in Li-S batteries through sophisticated quantum chemical calculations, in combination with <superscript>7</superscript>Li nuclear magnetic resonance (NMR) spectroscopy. Identified as Li bond, the strong dipole-dipole interaction between Li polysulfides and Li-S cathode materials originates from the electron-rich donors (e.g., pyridinic nitrogen (pN)), and is enhanced by the inductive and conjugative effect of scaffold materials with π-electrons (e.g., graphene). The chemical shift of Li polysulfides in <superscript>7</superscript>Li NMR spectroscopy, being both theoretically predicted and experimentally verified, is suggested to serve as a quantitative descriptor of Li bond strength. These theoretical insights were further proved by actual electrochemical tests. This work highlights the importance of Li bond chemistry in Li-S cell and provides a deep comprehension, which is helpful to the cathode materials rational design and practical applications of Li-S batteries. [ABSTRACT FROM AUTHOR]
- Subjects :
- LITHIUM
LITHIUM sulfur batteries
ENERGY density
ENERGY storage
POLYSULFIDES
Subjects
Details
- Language :
- English
- ISSN :
- 14337851
- Volume :
- 56
- Issue :
- 28
- Database :
- Complementary Index
- Journal :
- Angewandte Chemie International Edition
- Publication Type :
- Academic Journal
- Accession number :
- 123804895
- Full Text :
- https://doi.org/10.1002/anie.201704324