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Polypyrrole coated hollow metal–organic framework composites for lithium–sulfur batteries.
- Source :
- Journal of Materials Chemistry A; 9/7/2019, Vol. 7 Issue 33, p19465-19470, 6p
- Publication Year :
- 2019
-
Abstract
- Polypyrrole (PPy) coated hollow metal–organic framework (MOF) composites are synthesized through a simple melt-diffusion method followed by a water-phase dissolution process. Here, we used zeolitic imidazolate framework-67 (ZIF-67) as a precursor and then coated it with a PPy layer (ZIF-67-S-PPy) to prepare a lithium–sulfur battery (Li–S battery) electrode material. The special hollow structure can effectively inhibit device volumetric expansion caused by generated heat. Furthermore, this work also obtained a series of samples containing sulfur to explore the appropriate sulfur ratio. After electrochemical testing, the composites with a sulfur ratio of 60% achieved the highest specific capacity (1092.5 mA h g<superscript>−1</superscript>) among the tested samples, and 353.6 mA h g<superscript>−1</superscript> remained after 200 cycles. The specific capacities of ZIF-67-S, S-PPy and sulfur without a host were 599.8 mA h g<superscript>−1</superscript>, 328.7 mA h g<superscript>−1</superscript>, and 364.8 mA h g<superscript>−1</superscript>, respectively, at 0.1C. The results indicated that the capacity of polymer-coated hollow MOF composite electrodes was obviously improved by the designed synthesis strategy, suggesting its potential for high-performance Li–S batteries. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 20507488
- Volume :
- 7
- Issue :
- 33
- Database :
- Complementary Index
- Journal :
- Journal of Materials Chemistry A
- Publication Type :
- Academic Journal
- Accession number :
- 138156678
- Full Text :
- https://doi.org/10.1039/c9ta05812e