Journal
CHEMSUSCHEM
Volume 12, Issue 23, Pages 5172-5182Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201902227
Keywords
batteries; confinement; polypyrrole; sulfur; zirconium phosphate
Funding
- Foundation of the National Natural Science Foundation of China [21878206, 21576184]
- International Science and Technology Cooperation Program of China [2017YFE0129200]
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Although lithium-sulfur batteries are promising environmentally friendly and low-cost energy storage devices with high energy densities, many obstacles such as poor conductivity, volume expansion and the shuttle effect still limit their large-scale commercialization. In this work, a 2D sandwich-like alpha-ZrP/polypyrrole (alpha-ZrP/PPy) material with a nanosheet structure was designed as a sulfur host. The material can provide unique ion transfer channels for the rapid transfer of Li+ ions and catalytically promote the conversion of lithium polysulfides (LiPSs). Moreover, the alpha-ZrP nanosheets provides a true covalent anchor for sulfur species, whereas the PPy builds a physical barrier and forms a conductive network for accelerating the electron transport and promoting the electrochemical performance. In addition, the moderate catalytic activity and true sulfur confinement effect of alpha-ZrP were confirmed by experiments and theoretical calculations. The alpha-ZrP/PPy@S cathode exhibits a highly reversible capacity of 727.2 mAh g(-1) even at a high current density of 5 C, offering a novel cathode material for high performance Li-S batteries.
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