Volume 57, Issue 51 pp. 16732-16736
Communication

The Radical Pathway Based on a Lithium-Metal-Compatible High-Dielectric Electrolyte for Lithium–Sulfur Batteries

Ge Zhang

Ge Zhang

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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Dr. Hong-Jie Peng

Dr. Hong-Jie Peng

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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Chen-Zi Zhao

Chen-Zi Zhao

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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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

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Li-Da Zhao

Li-Da Zhao

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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Peng Li

Peng Li

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

Advanced Research Institute of Multidisciplinary Science, Beijing Institute of Technology, Beijing, 100081 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: 29 October 2018
Citations: 217

Graphical Abstract

Li−S batteries: A lithium-compatible and strongly polysulfide-solvating high-dielectric electrolyte based on tetramethylurea was proposed to direct a solvation-mediated radical reaction pathway. It enables Li−S pouch cells to deliver an energy density of 324 Wh kg−1. Key: red=electrochemical, black=chemical, dashed=diffusion/precipitation.

Abstract

High-dielectric solvents were explored for enhancing the sulfur utilization in lithium–sulfur (Li−S) batteries, but their applications have been impeded by low stability at the lithium metal anode. Now a radical-directed, lithium-compatible, and strongly polysulfide-solvating high-dielectric electrolyte based on tetramethylurea is presented. Over 200 hours of cycling was realized in Li|Li symmetric cells, showing good compatibility of the tetramethylurea-based electrolyte with lithium metal. The high solubility of short-chain polysulfides, as well as the presence of active S3.− radicals, enabled pouch cells to deliver a discharge capacity of 1524 mAh g−1 and an energy density of 324 Wh kg−1. This finding suggests an alternative recipe to ether-based electrolytes for Li−S batteries.

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