Volume 129, Issue 28 pp. 8290-8294
Zuschrift

Lithium Bond Chemistry in Lithium–Sulfur Batteries

Ting-Zheng Hou

Ting-Zheng Hou

Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing, 100084 P.R. China

University of California Berkeley, Berkeley, CA, 94720 USA

These authors contributed equally to this work.

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Wen-Tao Xu

Wen-Tao Xu

Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing, 100084 P.R. China

University of California Berkeley, Berkeley, CA, 94720 USA

These authors contributed equally to this work.

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Xiang Chen

Xiang Chen

Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing, 100084 P.R. China

These authors contributed equally to this work.

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Hong-Jie Peng

Hong-Jie Peng

Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing, 100084 P.R. China

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Prof. Jia-Qi Huang

Prof. Jia-Qi Huang

Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing, 100084 P.R. China

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Prof. Qiang Zhang

Corresponding Author

Prof. Qiang Zhang

Beijing Key Laboratory of Green Chemical Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing, 100084 P.R. China

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First published: 18 May 2017
Citations: 97

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 7Li 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 7Li 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.

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