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Sustainable scalable synthesis of sulfide nanocrystals at low cost with an ionic liquid sulfur precursor.

ABSTRACT: Increasing the sustainability of nanocrystals is crucial to their application and the protection of the environment. Sulfur precursors for their synthesis are commonly obtained through multiple steps from H₂S, only to be converted back to H₂S during the synthesis of the nanocrystals. This convoluted process requires energy, reduces yields, increases waste and auxiliaries, and complicates recycling. Using H₂S directly could drastically improve sustainability, but is prevented by toxicity and handling. We here show that H₂S is stabilized by reaction with oleylamine (the most common and versatile ligand in nanoparticle synthesis) to form an ionic liquid precursor that addresses all major principles of green chemistry: it is made in one exothermic step, it leaves the reaction yielding a safer product and allowing the separate recycling of the precursors, and it produces high quality nanocrystals with high yields (sulfur yield?>?70%) and concentrations (90?g?L^-1) in ambient conditions.

SUBMITTER: Yuan B

PROVIDER: S-EPMC6172249 | biostudies-literature | 2018 Oct

REPOSITORIES: biostudies-literature

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Sustainable scalable synthesis of sulfide nanocrystals at low cost with an ionic liquid sulfur precursor.

Yuan Bin B Egner Timothy Karl TK Venditti Vincenzo V Cademartiri Ludovico L

Nature communications 20181004 1

Increasing the sustainability of nanocrystals is crucial to their application and the protection of the environment. Sulfur precursors for their synthesis are commonly obtained through multiple steps from H2S, only to be converted back to H2S during the synthesis of the nanocrystals. This convoluted process requires energy, reduces yields, increases waste and auxiliaries, and complicates recycling. Using H2S directly could drastically improve sustainability, but ...[more]

PMID: 30287813

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Project description:With the development of mobile electronic devices, there are more and more requirements for high-energy storage equipment. Traditional lithium-ion batteries, like lithium-iron phosphate batteries, are limited by their theoretical specific capacities and might not meet the requirements for high energy density in the future. Lithium-sulfur batteries (LSBs) might be ideal next-generation energy storage devices because they have nearly 10 times the theoretical specific capacities of lithium-ion batteries. However, the severe capacity decay of LSBs limits their application, especially at high currents. In this study, an ionic liquid (IL) electrolyte additive, TDA+TFSI, was reported. When 5% of the TDA+TFSI additive was added to a traditional ether-based organic electrolyte, the cycling performance of the LSBs was significantly improved compared with that of the LSBs with the pure traditional organic electrolyte. At a rate of 0.5 C, the discharge specific capacity in the first cycle of the LSBs with the 5% TDA+TFSI electrolyte additive was 1167 mAh g-1; the residual specific capacities after 100 cycles and 300 cycles were 579 mAh g-1 and 523 mAh g-1, respectively; and the average capacity decay rate per cycle was only 0.18% in 300 cycles. Moreover, the electrolyte with the TDA+TFSI additive had more obvious advantages than the pure organic ether-based electrolyte at high charge and discharge currents of 1.0 C. The residual discharge specific capacities were 428 mAh g-1 after 100 cycles and 399 mAh g-1 after 250 cycles, which were 13% higher than those of the LSBs without the TDA+TFSI additive. At the same time, the Coulombic efficiencies of the LSBs using the TDA+TFSI electrolyte additive were more stable than those of the LSBs using the traditional organic ether-based electrolyte. The results showed that the LSBs with the TDA+TFSI electrolyte additive formed a denser and more uniform solid electrolyte interface (SEI) film during cycling, which improved the stability of the electrochemical reaction.

Dataset Information

Sustainable scalable synthesis of sulfide nanocrystals at low cost with an ionic liquid sulfur precursor.

Publications

Sustainable scalable synthesis of sulfide nanocrystals at low cost with an ionic liquid sulfur precursor.

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